GB 15304-1994 Global Maritime Distress and Safety System (GMDSS) Technical requirements for shipboard radio communication equipment
Some standard content:
National Standard of the People's Republic of China
Technical requirement for merinetelecommuaicatlon equipment of Global Maritime Distress and Safety System (GMDSS)
Global maritime distress and safety system(GMDSS)Technical requirement for merinetelecommuaicatlon equipment
1 Subject content and applicable scope
GB 15304--94
This standard specifies the main technical requirements and related terms for merinetelecommuaicatlon equipment of Global Maritime Distress and Safety System. This standard applies to all passenger ships and ships of 300Gt (gross tonnage) and above in all ocean navigation areas. 2 Referenced standards
JT4607 Terms for maritime communication and navigation
3 Terms
3.1 Global Maritime Distress and Safety System Navigation AreasGMDSSareas In the Global Maritime Distress and Safety System, the world's seas are divided into four navigation areas:. A1 sea area: refers to the area covered by at least one very high frequency (VHF) companion station with continuous DSC reporting capability, which can be specified by each contracting government.
b, A2 sea area: refers to the area covered by at least one medium frequency (MF) coast station with continuous DSC alarm capability, in addition to the A1 sea area, which can be specified by each contracting government. C, A3 sea area: refers to the area covered by INMARSAT geostationary satellites with continuous alarm capability, outside the A1 and A2 sea areas.
d. A4 sea area refers to the area outside the AI.A2.A3 sea areas. 3.2 Emergency Position-Indicating Radiobeacon (EPIRB) is a radio beacon that can automatically or manually transmit a danger avoidance alarm signal in an emergency. 3.3 Satellite emergency position-indicating radio beacon (satellite EPIRB) is an emergency position-indicating radio beacon used in satellite mobile services. 3.4 NAVTEX service is a service that uses narrow-band direct-printing telegraphs at the internationally specified 518 Hz rate to broadcast marine safety information in English to relevant ships, and is automatically received by ships. 3.5 Frequency shift telegraph is a communication method in which the carrier frequency of the F1B
telegraph signal moves between predetermined values. 3.6 A telegraph signal without modulating a subcarrier. The phase of the carrier is varied between predetermined values without modulating the subcarrier. 3.7 A telegraph signal with modulated subcarrier. Approved by the State Administration of Technical Supervision on December 20, 1994. Implemented on July 1, 1995. GB15304-94. A telegraph signal with modulated subcarrier. The phase of the carrier is varied between predetermined values and a notification method using modulated subcarrier. 3.8 A radar transponder SART. Operating at 9 GHz, it can respond to radar signals. Its transmitted signal indicates the location of the shelter unit or personnel and provides identification symbols on the radar display.
3.9 Equivalent all-phase radiated power (EIRP)
The product of the power supplied to the antenna and the gain relative to the omnidirectional line in a given direction. 4 Main technical requirements for marine radio communication equipment 4.1 Very high frequency (VHF) radio equipment
4.1.1--General requirements
4. 1.1. 1 The equipment consists of receiver, transmitter, DSC and other parts. 4. 1. 1.2 Frequency range: 156. 0~174. 0 MHz. a. The equipment should have a sufficient number of channels. The radiotelephone should have at least the 6th (156.3MHz), 13th (156.650MHz) and 16th (156.8MHz) channels.
b. DSC should be the 70th (156.52MHz) channel. 4.1.1.3 The interval between each adjacent channel is 25kHz. 4.1.1.4 Frequency tolerance: 10-5.
4.1.1.5 Emission category
, radiotelephone: F3E or G3E;
b.DSC: F1B or G2B.
5 Transmitting power: The transmitter power is 625W and can be reduced to 0.1~1W, but the reduced power is not mandatory for channel 70. 4. 1. 1. 6
4. 1. 1.7 Receiver sensitivity
Radiotelephone: When S/N=20dB, the sensitivity should be equal to or better than 2μV, b.DSC: When the modulated input signal electromotive force is 1 μV, the output character error rate should be less than or equal to 10-2. 4. 1. 1. B The equipment should be able to be in operation within 1 min after power-on, 4.1.1.9 Can quickly change channels, in any case should not exceed 5s. 4.1.1.10 The switching between the receiving and transmitting states should not exceed 0.3s. 4.1.1.11 The equipment should have a visual indication of the on state, a visual indication of the carrier being transmitted and a display. The number of the working channel should be clearly marked with quick selection keys for the 16th and 70th channels. 4.1.1.12 It should be possible to start sending DSC danger alarm signals under normal driving conditions. The DSC part can also be an independent device. 4. 1. 1. 13
4. 1. 1. 14
4. 1. 1. 15
4. 1. 1. 16
4. 1. 1. 17
DSC should be able to be used and can be on duty for 24 hours continuously on channel 70. It should be able to use radiotelephone to continuously be on duty on the distress channel (156.8MHz, channel 16). It shall have a special sound alarm and visual indication to indicate that a distress call or an emergency call or a call of the type of retreat is received. The equipment shall be able to make the following calls by voice and DSC: distress, urgency and safety,
b. Ship operation requirements;
public communications.
4.1.1.18 The equipment shall be able to make the following communications by voice: a.
distress, urgency and safety
b. Ship operation requirements;
c. public communications.
4.1.2DSC operating characteristics
GB 15304-94
4.1.2.1 Ten-unit error detection code, subcarrier frequency is 1700Hz, single tone rate tolerance of ±400Hz is ±10 Hz. 4.1.2.2 Modulation rate 1 200 Bd, modulation coefficient 2.0 ± 10%. 4.1.2.3 Capable of storing at least 20 distress messages. 4.2 Medium frequency (MF) radio equipment
4.2.1 General requirements
4.2.1.1 The equipment consists of receiver, transmitter, DSC, NBDP and other main parts. 4.2.1.2 Frequency range: 1 605~4 000 kHz. 4.2.1.3 Frequency tolerance, ±10Hz.
4.2.1.4 Emission category
: Radiotelephone: J3E, H3E:
b.DSC and NBDP: F1B or J2B.
4.2. 1.5 Transmission power
The peak envelope power of J3E or H3E and the average power of J2B or F1B should be 60~400W. 4.2.1.6 Receiver sensitivity
a. Radiotelephone: When S/N=20dB, the sensitivity should be equal to or better than 6μV, b.DSC and NBDP: When S/N=12dB, the output character error rate should be less than or equal to 10-3. 4.2.1.7 It should be able to be in operation within 1min after turning on. 4.2.1.8 The ability to quickly change channels should not exceed 15s under any circumstances. 4.2.1.9 It should be equipped with a device to indicate current or antenna power. 4.2.1.10 The selected transmitter frequency should be clearly marked on the panel, especially the two frequencies 2182kHz and 2187.5kHz.
It should have a special sound alarm and visual indication to indicate that a distress or emergency call or a distress category call has been received. 4.2.1.11
4.2.1.12
It should be possible to initiate the transmission of the DSC emergency exit alarm signal from the normal driving position. 3DSC and NBDP can also be independent equipment. 4.2.1.13
4.2.1.14 It should be possible to use DSC at 2187.5kHz for 24 hours. It should be possible to use radiotelephone at 2182kHz for 24 hours. 4.2.1. 15
5 The following calls should be made by voice and DSC: 4. 2. 1. 16
Distress, urgency and safety!
Ship operation requirements:
Public communication.
4.2.1.17 The following communications should be made by voice and NBDP: a. Distress, urgency and safety 1
b, Ship operation requirements;
c Public communication.
4.2.2DSC operating characteristics
4.2.2.1 Ten-unit error detection code, subcarrier is 1700Hz, single tone with frequency shift ±85Hz, rate tolerance is ±10Hz. Modulation rate 100Bd, receiving bandwidth is 300Hz.
4.2.2.2 Can store at least 20 distress messages. 4.2.3 NBDP operating characteristics
4.2.3.1 Seven-unit constant ratio error detection code, subcarrier is 1700Hz, frequency shift ±85Hz single tone frequency tolerance ±10Hz, modulation rate 100Bd, receiver bandwidth is 300Hz.
4.2.3.2 It has two error correction modes: ARQ and FEC. :com4.3 Medium/high frequency (MF/HF) radio equipment4.3.1 General requirements
GB 1530494
4.3.1.1 It consists of the main parts such as receiver, transmitter, DSC, NBDP, etc. 4. 3.1.2 Frequency range, it should be able to transmit and receive on all frequencies specified in the 1 650～27 500 kHz band, and at least the frequencies listed in Table 1 can be used by the operator at any time. Table 1
Service types
Radiophone
4.3.1.3 Frequency tolerance
Radiophone: 50 Hz;
DSC.NBDP.10 Hz.
4.3.1.4 Emission category
Radiophone: J3E, H3E:
b.DSC and NBDP: F1B or J2B.
4.3.1.5 Transmitting power
Frequency, kHz
8414-5
The packet power of J3E or H3E, the average power of J3B or F1B should be 60 to 400 W. 4.3.1.6 Receiver sensitivity
Radiotelephone: When S/N=20dB, the sensitivity should be equal to or better than 6μV12290
b.DSC and NBDP: When S/N=12dB, the output character error rate should be less than or equal to 10-24. 3.1.7 The equipment should be able to be in operation within 1 minute after being turned on. 4.3.1.8 The channel can be changed quickly, which should not exceed 15s in any case. 4.3.1.9 It should be possible to make a continuous distress call on one or more DSC distress frequencies (see Table 1) 16 420
16 804. 5
4.3.1.1D When using a scanning receiver to monitor more than one DSC channel, all selected channels should be scanned once within 2B, and the time spent on each channel should be sufficient to detect the spot pattern before each digital selective call. The scan should only be stopped when the 100Bd spot pattern is detected.
4.3.1.11 A device should be provided to indicate the antenna current or antenna power. 4.3.1.12 The selected transmission rate should be clearly indicated on the panel, especially the two frequencies 2 182 kHz and 2 187. 5 kHz.
4.3.1.13 There should be a special audible alarm and visual indication to indicate that a distress call or an urgency call or a distress category call has been received. 4.3.1.14 It is to be possible to initiate the transmission of DSC distress alert signals from the normal navigation position. 4.3.1.15 DSC and NBDP may be independent equipment. 4.3.1.16 It is to be possible to use DSC to maintain continuous watch on any of the four frequencies: 2 187.5 kHz, 8 414.5 kHz, 4 207.5 kHz, 6 312 kHz, 12 577 kHz, 16 804.5 kHz. 4.3.1.17 It is to be possible to use radiotelephone to maintain continuous watch on 2 182 kHz until 1 February 1999 or other date determined by the Maritime Safety Committee of the International Maritime Organization.
4.3.1.18 The equipment should be able to use voice and DSC to make the following types of calls: distress, urgency and safety;
b. Ship operation requirements;
c. Public correspondence.
4.3.1.19 The equipment should be able to use voice and NBDP to make the following communications: com. Distress, urgency and safety;
b. Ship operation requirements;
c. Public correspondence.
4.3.2DSC operating characteristics
GB15304—94
4.3.2.1 Ten-unit error detection code, subcarrier is 1700Hz, single tone with frequency shift ±85Hz, frequency tolerance is ±10Hz, modulation rate is 100Bd, and receiver bandwidth is 300Hz.
4.3.2.2 Can store at least 20 distress messages. 4.3.3NBDP operating characteristics
4.3.3.1 Seven-unit constant ratio error detection code, subcarrier is 1700Hz, single tone frequency tolerance of ±10Hz shifted by 85Hz, modulation rate 100B, receiver bandwidth is 300Hz.
4.3.3.2 Has two working modes of ARQ and FEC. 4.4International Maritime Satellite A standard ship earth station 4.4.1 Frequency range
4.4.1.1 Receiving frequency, 1535.0~1543.5MHz. 4.4.1.2 Transmitting frequency: 1636.5~1645.0MHz. 4.4.1.3 It should be able to automatically tune to any of the 339 frequencies, and the channel spacing is 25kHz. 4.4.2 G/T value (ratio of receiving antenna gain G to receiving system noise temperature T expressed in decibels), -4 dB (when the antenna elevation angle is 5°).
4.4.3 EIRP.36 dBw.
4.4.4 Communication method
4.4.4.1 Telephone (two-way): FM.
4.4.4.2 User telegram
Shore+ship: TDM (time division multiplexing), bi-phase phase shift keying, 1.2 kbps; ship→shore: TDMA (time division multiple access), bi-phase phase shift keying, 4.8 kbps. b.
4.4.5 Antenna: right-hand circular polarization, with the function of automatically pointing to the satellite. The equipment should have the following functions:
It should be able to initiate and send distress signals by radiotelephone or direct printing telegraph at the bridge and another determined position; b
Initiate and receive distress priority calls;
Maintain watch for shore-to-ship distress alerts, including shore-to-ship distress alerts in specially specified geographical areas; c
Send and receive general radio communications by radiotelephone or direct printing telegraph. 4.4.7 Power supply: powered by the ship's main power supply, and should be able to operate using a backup power supply. 4.5 International Maritime Satellite C Ship Earth Station
4.5.1 Frequency range
4.5.1. 1 Receiving frequency 1 530. 0~1 545.0 MHz. 4.5.1.2 Transmitting frequency: 1 626.5~1 646.5MHz. 4. 5.1. 3 The channel spacing is 5 kHz.
4.5.2G/T value: -23dBK (when the antenna elevation angle is 5°). 4.5.3EIRP.12dBw.
4.5.4Modulation mode
a: Bi-phase phase shift keying;
b.Transmission rate: 600bpg.
4.5.5Antenna: right-hand circular polarization.
4.5.6The equipment should have the following functions:
GB 1530494
a.Should send, receive, store, forward, direct print telegraph communications, b.For Class I and II ships, it can provide enhanced group calling equipment performance; the distress and safety service should be able to start and send distress call data reports and inquiries at the normal driving position or any other position dedicated to distress.
4.6 Enhanced Group Calling Equipment (EGC)
4.6.1 Receiving frequency: 1530.0~1545.0MHz. 4.6.2 Modulation mode
a. Bi-phase phase shift keying
b. Transmission rate: 600bps
4.6.3 Antenna, right blue circular polarization.
4.6.4 The equipment should be equipped with a special sound alarm and visual indication on the bridge to indicate that a distress or emergency call or a distress category call has been received.
4.6.5 This equipment can be a stand-alone device or combined with the C ship's earth station. 4.6.6 Power supply: powered by the ship's main power supply, and should be able to use another power supply. 4.7 Navtex equipment
4.7.1 Receiving frequency: 518kHz.
4.7.2 Frequency tolerance: ±10Hz.
4.7.3 Working type: F1B.
4.7.4 Modulation rate: 100 Bd.
4. 7.5 Sensitivity: When a 2μV electromotive force is connected in series with a 50 0 resistor, the character error rate is less than 4×10-z. 4.7.6 It should be able to store at least 30 telegram identification marks. 4.8 VHF-70 Emergency Position Indicating Radio Beacon (VHF-70EPIRB) 4.8.1
Working frequency: 156.525MHz (VHF Channel 70). Frequency tolerance: 10-5.
Emission category: G2B.
Occupied frequency band: less than 16kHz.
EIRP not less than 100mW.
Antenna, vertical polarization.
Modulation rate: 1 200 Bd, modulation coefficient is 2±10%. 4.8.7
Subcarrier: 1700Hz, frequency shift ±400Hz. 4.8.8
4.8.9The electrical part is 10tm underwater and remains watertight for at least 5min. 4. 8. 10
It should not be damaged when falling into water from a height of 20m.
No alarm signal should be emitted during detection.
Power supply: Replace the battery regularly, and the battery capacity is sufficient to enable the equipment to work for at least 48 hours. 4.9406MHz Satellite Emergency Position Indicating Radio Beacon (406MHzEPIRB)4.9.1 Operating frequency: 406.025±0.002MHz, including 121.5MHz rated frequency, 406.025±0.005MHz after five years of leaving the factory. 4.9.2 Frequency stability: short-term 2×10-/100ms; medium-term 1×10\/min.
Transmitting type: G1B.
4. 9. 4 Transmitting power: 5 W±2 dB. 4.9.5i
Modulation: phase modulation.
5 Antenna: right-hand circular polarization.
: comGB 15304—94
4. 9.7 The electrical parts shall remain watertight for at least 5 minutes at a depth of 1 m underwater. 4. 9.8 The equipment shall not be damaged if it falls into water from a height of 20 m. 4.9.9 Power supply, replace batteries regularly, the battery capacity is sufficient to make the equipment work for at least 48 hours. 4.9.10 When the distressed ship sinks to a depth of 1m in the water, the EPIRN should be automatically released from the mounting bracket and float on the water surface to automatically transmit distress alarm signals and positioning signals for aviation search. The EPIRB can automatically transmit flash signals. 4.9.11 The EPIRB should be able to write the ship's identification code (such as ship name call sign, etc.) and other relevant parameters. 4. 9. 12
Can be tested on board without transmitting an alarm signal. The safety distance of 3 pairs of compasses is 1Ⅱ.
4.9.14 The shell color is high-visibility yellow/orange and has retro-reflective material. 4.101.6GHz Satellite Emergency Position Indicating Radio Beacon (1.6GHz EPIRB) 4.10.1 Operating frequency, 1 644.3~1 644.5 MHz; 1645.5~1646.5MHz (for second generation satellite only). 4.10.2
Frequency stability: short term 1x10-/min:
long term better than ±3×10-/year,
4.10.3 Emission type: G1B.
4.10.4 Transmission power at antenna input 0 dBW±1/3dB. 4.10.5 Modulation: non-coherent binary frequency shift keying, modulation rate 32 Bd. 4.10.6
Antenna: right-hand circular polarization.
Electrical part of the equipment shall remain watertight for at least 5 minutes at 10m underwater. 4.10.7
4.10.8 The equipment shall not be damaged if dropped into water from a height of 20m. 4.10.9
Power supply: Replace the battery regularly, and the battery capacity shall be sufficient to operate the equipment for 48 hours. 4.10.10 The housing shall be yellow/orange for high visibility and equipped with retro-reflective material. 4.11 Search radar transponder (SART)
4.11.1 Operating frequency: 9 200~9 500 MHz. Frequency stability: 10-5.
4.11.3 EIRP shall not be less than 400mW (equivalent to +26dBm). Scan rate: 200MHz/5μs.
5 Scanning mode: sawtooth wave, forward scanning time 7.5±1 Jμs, reverse scanning time 0.4±0.1μs. 4.11.5
6 Pulse duration: 100μs
4.11.7 Effective height of the line: 10m above sea level, horizontal polarization. 4.11.8 When the pulse width of the trigger radar is greater than 400ns, the receiver sensitivity is -50dBm; when the pulse width of the trigger radar is less than or equal to 100ns, the sensitivity is -37dBm (including antenna gain). 4.11.9 The time delay between receiving the radar signal and starting to transmit should not be greater than 0.5μs. 4. 11. 10 It should be able to remain watertight for at least 5 minutes at 10m underwater. 4.11.11 The equipment should not be damaged when it falls into the water from a height of 20m. 4.11.12 Power supply
4.11.12.1 The battery capacity should be sufficient to enable the equipment to operate for 96 hours in the ready state and to operate for 8 hours after continuous interrogation with a 1kHz pulse repetition frequency after the ready state.
4.11.12.2 Replace the battery regularly.
4.11.13 The SART should be able to float on the water surface automatically. 4.11.14 The transmitted signal should be able to produce a straight line of 12 points on the radar screen of the search and rescue ship within 8 miles. 4.11.15 The external charging color is high-visibility yellow/orange and is equipped with retroreflective material. 4.12 Two-way radio telephone
:comGB 15304-94
1 Working frequency, 156.8 MHz (VHF Channel 16) and at least another channel. 4. 12.2
Rated rate stability: 10
Operation category F3E or G3E.
Transmitting power: 0.25~1 W.
Receiver sensitivity: When S/N=12dB, the sensitivity is better than 2μV. The equipment should be able to remain watertight at 1m underwater for at least 5min. The equipment should not be damaged when it falls from a height of 1Ⅲ onto a hard surface. Power supply
4. 12. 8. 1
4. 12. 8. 2
The battery capacity should be sufficient to ensure 8 hours of operation at the maximum rated power when the duty cycle is 19. The duty cycle is defined as: 6 s transmission, 6 s reception above the squelch level, and 48 s reception below the squelch level. Replace the battery regularly.
4.12. 8.3
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Navigation Equipment Standards. This standard was drafted by the China Communications and Telecommunications Center. The main drafters of this standard are Li Laixing, Li Shi, and Yuan Shuncai. ：com10
It should not be damaged when falling into water from a height of 20m.
No alarm signal should be emitted during detection.
Power supply: Replace the battery regularly, and the battery capacity is sufficient to keep the device working for at least 48 hours. 4.9406MHz Satellite Emergency Position Indicating Radio Beacon (406MHzEPIRB)4.9.1 Operating frequency: 406.025±0.002MHz, including 121.5MHz rate, 406.025±0.005MHz after five years of leaving the factory. 4.9.2 Frequency stability: short-term 2×10-/100ms; medium-term 1×10\/min.
Emission type: G1B.
4. 9. 4 Transmission power: 5 W±2 dB. 4.9.5i
Modulation: phase modulation.
5 Antenna: right-hand circular polarization.
：comGB 15304—94
4.9.7 The electrical parts should remain watertight for at least 5 minutes at 1 m underwater. 4.9.8 The equipment should not be damaged when it falls into the water from a height of 20 meters. 4.9.9 Power supply, replace the battery regularly, and the battery capacity should be sufficient to keep the equipment working for at least 48 hours. 4.9.10 When the distressed ship sinks to a depth of 1 m in the water, the EPIRN should be automatically released from the mounting bracket and float on the water surface to automatically transmit a distress alarm signal and a positioning signal for aviation search. The EPIRB can automatically transmit a flash signal. 4.9.11 The EPIRB should be able to write the ship's identification code (such as ship name call sign, etc.) and other relevant parameters. 4.9.12
It can be tested on board without transmitting an alarm signal. The safety distance of the 3 pairs of compasses is 1Ⅱ.
4.9.14 The shell color is high-visibility yellow/orange and has retro-reflective material. 4.101.6GHz Satellite Emergency Position Indicating Radio Beacon (1.6GHz EPIRB) 4.10.1 Operating frequency, 1 644.3~1 644.5 MHz; 1645.5~1646.5MHz (for second generation satellite only). 4.10.2
Frequency stability: short term 1x10-/min:
long term better than ±3×10-/year,
4.10.3 Emission type: G1B.
4.10.4 Transmission power at antenna input 0 dBW±1/3dB. 4.10.5 Modulation: non-coherent binary frequency shift keying, modulation rate 32 Bd. 4.10.6
Antenna: right-hand circular polarization.
Electrical part of the equipment shall remain watertight for at least 5 minutes at 10m underwater. 4.10.7
4.10.8 The equipment shall not be damaged if dropped into water from a height of 20m. 4.10.9
Power supply: Replace the battery regularly, and the battery capacity shall be sufficient to operate the equipment for 48 hours. 4.10.10 The housing shall be yellow/orange for high visibility and equipped with retro-reflective material. 4.11 Search radar transponder (SART)
4.11.1 Operating frequency: 9 200~9 500 MHz. Frequency stability: 10-5.
4.11.3 EIRP shall not be less than 400mW (equivalent to +26dBm). Scan rate: 200MHz/5μs.
5 Scanning mode: sawtooth wave, forward scanning time 7.5±1 Jμs, reverse scanning time 0.4±0.1μs. 4.11.5
6 Pulse duration: 100μs
4.11.7 Effective height of the line: 10m above sea level, horizontal polarization. 4.11.8 When the pulse width of the trigger radar is greater than 400ns, the receiver sensitivity is -50dBm; when the pulse width of the trigger radar is less than or equal to 100ns, the sensitivity is -37dBm (including antenna gain). 4.11.9 The time delay between receiving the radar signal and starting to transmit should not be greater than 0.5μs. 4. 11. 10 It should be able to remain watertight for at least 5 minutes at 10m underwater. 4.11.11 The equipment should not be damaged when it falls into the water from a height of 20m. 4.11.12 Power supply
4.11.12.1 The battery capacity should be sufficient to enable the equipment to operate for 96 hours in the ready state and to operate for 8 hours after continuous interrogation with a 1kHz pulse repetition frequency after the ready state.
4.11.12.2 Replace the battery regularly.
4.11.13 The SART should be able to float on the water surface automatically. 4.11.14 The transmitted signal should be able to produce a straight line of 12 points on the radar screen of the search and rescue ship within 8 miles. 4.11.15 The external charging color is high-visibility yellow/orange and is equipped with retroreflective material. 4.12 Two-way radio telephone
:comGB 15304-94
1 Working frequency, 156.8 MHz (VHF Channel 16) and at least another channel. 4. 12.2
Rated rate stability: 10
Operation category F3E or G3E.
Transmitting power: 0.25~1 W.
Receiver sensitivity: When S/N=12dB, the sensitivity is better than 2μV. The equipment should be able to remain watertight at 1m underwater for at least 5min. The equipment should not be damaged when it falls from a height of 1Ⅲ onto a hard surface. Power supply
4. 12. 8. 1
4. 12. 8. 2
The battery capacity should be sufficient to ensure 8 hours of operation at the maximum rated power when the duty cycle is 19. The duty cycle is defined as: 6 s transmission, 6 s reception above the squelch level, and 48 s reception below the squelch level. Replace the battery regularly.
4.12. 8.3
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Navigation Equipment Standards. This standard was drafted by the China Communications and Telecommunications Center. The main drafters of this standard are Li Laixing, Li Shi, and Yuan Shuncai. ：com10
It should not be damaged when falling into water from a height of 20m.
No alarm signal should be emitted during detection.
Power supply: Replace the battery regularly, and the battery capacity is sufficient to keep the device working for at least 48 hours. 4.9406MHz Satellite Emergency Position Indicating Radio Beacon (406MHzEPIRB)4.9.1 Operating frequency: 406.025±0.002MHz, including 121.5MHz rate, 406.025±0.005MHz after five years of leaving the factory. 4.9.2 Frequency stability: short-term 2×10-/100ms; medium-term 1×10\/min.
Emission type: G1B.
4. 9. 4 Transmission power: 5 W±2 dB. 4.9.5i
Modulation: phase modulation.
5 Antenna: right-hand circular polarization.
：comGB 15304—94
4.9.7 The electrical parts should remain watertight for at least 5 minutes at 1 m underwater. 4.9.8 The equipment should not be damaged when it falls into the water from a height of 20 meters. 4.9.9 Power supply, replace the battery regularly, and the battery capacity should be sufficient to keep the equipment working for at least 48 hours. 4.9.10 When the distressed ship sinks to a depth of 1 m in the water, the EPIRN should be automatically released from the mounting bracket and float on the water surface to automatically transmit a distress alarm signal and a positioning signal for aviation search. The EPIRB can automatically transmit a flash signal. 4.9.11 The EPIRB should be able to write the ship's identification code (such as ship name call sign, etc.) and other relevant parameters. 4.9.12
It can be tested on board without transmitting an alarm signal. The safety distance of the 3 pairs of compasses is 1Ⅱ.
4.9.14 The shell color is high-visibility yellow/orange and has retro-reflective material. 4.101.6GHz Satellite Emergency Position Indicating Radio Beacon (1.6GHz EPIRB) 4.10.1 Operating frequency, 1 644.3~1 644.5 MHz; 1645.5~1646.5MHz (for second generation satellite only). 4.10.2
Frequency stability: short term 1x10-/min: bZxz.net
long term better than ±3×10-/year,
4.10.3 Emission type: G1B.
4.10.4 Transmission power at antenna input 0 dBW±1/3dB. 4.10.5 Modulation: non-coherent binary frequency shift keying, modulation rate 32 Bd. 4.10.6
Antenna: right-hand circular polarization.
Electrical part of the equipment shall remain watertight for at least 5 minutes at 10m underwater. 4.10.7
4.10.8 The equipment shall not be damaged if dropped into water from a height of 20m. 4.10.9
Power supply: Replace the battery regularly, and the battery capacity shall be sufficient to operate the equipment for 48 hours. 4.10.10 The housing shall be yellow/orange for high visibility and equipped with retro-reflective material. 4.11 Search radar transponder (SART)
4.11.1 Operating frequency: 9 200~9 500 MHz. Frequency stability: 10-5.
4.11.3 EIRP shall not be less than 400mW (equivalent to +26dBm). Scan rate: 200MHz/5μs.
5 Scanning mode: sawtooth wave, forward scanning time 7.5±1 Jμs, reverse scanning time 0.4±0.1μs. 4.11.5
6 Pulse duration: 100μs
4.11.7 Effective height of the line: 10m above sea level, horizontal polarization. 4.11.8 When the pulse width of the trigger radar is greater than 400ns, the receiver sensitivity is -50dBm; when the pulse width of the trigger radar is less than or equal to 100ns, the sensitivity is -37dBm (including antenna gain). 4.11.9 The time delay between receiving the radar signal and starting to transmit should not be greater than 0.5μs. 4. 11. 10 It should be able to remain watertight for at least 5 minutes at 10m underwater. 4.11.11 The equipment should not be damaged when it falls into the water from a height of 20m. 4.11.12 Power supply
4.11.12.1 The battery capacity should be sufficient to enable the equipment to operate for 96 hours in the ready state and to operate for 8 hours after continuous interrogation with a 1kHz pulse repetition frequency after the ready state.
4.11.12.2 Replace the battery regularly.
4.11.13 The SART should be able to float on the water surface automatically. 4.11.14 The transmitted signal should be able to produce a straight line of 12 points on the radar screen of the search and rescue ship within 8 miles. 4.11.15 The external charging color is high-visibility yellow/orange and is equipped with retroreflective material. 4.12 Two-way radio telephone
:comGB 15304-94
1 Working frequency, 156.8 MHz (VHF Channel 16) and at least another channel. 4. 12.2
Rated rate stability: 10
Operation category F3E or G3E.
Transmitting power: 0.25~1 W.
Receiver sensitivity: When S/N=12dB, the sensitivity is better than 2μV. The equipment should be able to remain watertight at 1m underwater for at least 5min. The equipment should not be damaged when it falls from a height of 1Ⅲ onto a hard surface. Power supply
4. 12. 8. 1
4. 12. 8. 2
The battery capacity should be sufficient to ensure 8 hours of operation at the maximum rated power when the duty cycle is 19. The duty cycle is defined as: 6 s transmission, 6 s reception above the squelch level, and 48 s reception below the squelch level. Replace the battery regularly.
4.12. 8.3
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Navigation Equipment Standards. This standard was drafted by the China Communications and Telecommunications Center. The main drafters of this standard are Li Laixing, Li Shi, and Yuan Shuncai. ：com10 The housing shall be yellow/orange for high visibility and equipped with retro-reflective material. 4.11 Search Radar Transponder (SART)
4. 11. 1 Operating frequency: 9 200~9 500 MHz. Frequency stability: 10-5.
4.11.3 EIRP not less than 400mW (equivalent to +26dBm). Scan rate: 200MHz/5μs.
5 Scanning pattern: sawtooth wave, forward scanning time 7.5±1 Jμs, reverse scanning time 0.4±0.1μs. 4.11.5
6 Pulse duration: 100μs
4.11.7 Effective height of the line: 10m above sea level, horizontal polarization. 4.11.8 When the trigger radar pulse width is greater than 400ns, the receiver sensitivity is -50dBm; when the trigger radar pulse width is less than or equal to 100ns, the sensitivity is -37dBm (including antenna gain). 4.11.9 The time delay between receiving the radar signal and starting to transmit should not be greater than 0.5μs. 4.11.10 It should be able to remain watertight for at least 5 minutes at 10m underwater. 4.11.11 The equipment should not be damaged when it falls into the water from a height of 20m. 4.11.12 Power supply
4.11.12.1 The battery capacity should be sufficient to enable the equipment to operate for 96 hours in the ready state and to operate for 8 hours after continuous interrogation with a 1kHz pulse repetition frequency after the ready state.
4.11.12.2 Replace the battery regularly.
4.11.13 The SART should be able to float on the water surface automatically. 4.11.14 The transmitted signal should be able to produce a straight line of 12 points on the radar screen of the search and rescue ship within 8 miles. 4.11.15 The external charging color is high-visibility yellow/orange and is equipped with retroreflective material. 4.12 Two-way radio telephone
:comGB 15304-94
1 Working frequency, 156.8 MHz (VHF Channel 16) and at least another channel. 4. 12.2
Rated rate stability: 10
Operation category F3E or G3E.
Transmitting power: 0.25~1 W.
Receiver sensitivity: When S/N=12dB, the sensitivity is better than 2μV. The equipment should be able to remain watertight at 1m underwater for at least 5min. The equipment should not be damaged when it falls from a height of 1Ⅲ onto a hard surface. Power supply
4. 12. 8. 1
4. 12. 8. 2
The battery capacity should be sufficient to ensure 8 hours of operation at the maximum rated power when the duty cycle is 19. The duty cycle is defined as: 6 s transmission, 6 s reception above the squelch level, and 48 s reception below the squelch level. Replace the battery regularly.
4.12. 8.3
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Navigation Equipment Standards. This standard was drafted by the China Communications and Telecommunications Center. The main drafters of this standard are Li Laixing, Li Shi, and Yuan Shuncai. ：com10 The housing shall be yellow/orange for high visibility and equipped with retro-reflective material. 4.11 Search Radar Transponder (SART)
4. 11. 1 Operating frequency: 9 200~9 500 MHz. Frequency stability: 10-5.
4.11.3 EIRP not less than 400mW (equivalent to +26dBm). Scan rate: 200MHz/5μs.
5 Scanning pattern: sawtooth wave, forward scanning time 7.5±1 Jμs, reverse scanning time 0.4±0.1μs. 4.11.5
6 Pulse duration: 100μs
4.11.7 Effective height of the line: 10m above sea level, horizontal polarization. 4.11.8 When the trigger radar pulse width is greater than 400ns, the receiver sensitivity is -50dBm; when the trigger radar pulse width is less than or equal to 100ns, the sensitivity is -37dBm (including antenna gain). 4.11.9 The time delay between receiving the radar signal and starting to transmit should not be greater than 0.5μs. 4.11.10 It should be able to remain watertight for at least 5 minutes at 10m underwater. 4.11.11 The equipment should not be damaged when it falls into the water from a height of 20m. 4.11.12 Power supply
4.11.12.1 The battery capacity should be sufficient to enable the equipment to operate for 96 hours in the ready state and to operate for 8 hours after continuous interrogation with a 1kHz pulse repetition frequency after the ready state.
4.11.12.2 Replace the battery regularly.
4.11.13 The SART should be able to float on the water surface automatically. 4.11.14 The transmitted signal should be able to produce a straight line of 12 points on the radar screen of the search and rescue ship within 8 miles. 4.11.15 The external charging color is high-visibility yellow/orange and is equipped with retroreflective material. 4.12 Two-way radio telephone
:comGB 15304-94
1 Working frequency, 156.8 MHz (VHF Channel 16) and at least another channel. 4. 12.2
Rated rate stability: 10
Operation category F3E or G3E.
Transmitting power: 0.25~1 W.
Receiver sensitivity: When S/N=12dB, the sensitivity is better than 2μV. The equipment should be able to remain watertight at 1m underwater for at least 5min. The equipment should not be damaged when it falls from a height of 1Ⅲ onto a hard surface. Power supply
4. 12. 8. 1
4. 12. 8. 2
The battery capacity should be sufficient to ensure 8 hours of operation at the maximum rated power when the duty cycle is 19. The duty cycle is defined as: 6 s transmission, 6 s reception above the squelch level, and 48 s reception below the squelch level. Replace the battery regularly.
4.12. 8.3
Additional Notes:
This standard was proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Navigation Equipment Standards. This standard was drafted by the China Communications and Telecommunications Center. The main drafters of this standard are Li Laixing, Li Shi, and Yuan Shuncai. ：com
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