GB/T 11443.1-1989 General technical requirements for domestic satellite communication earth stations Part 1: General requirements
Some standard content:
National Standard of the People's Republic of China
GB/T 11443.1—1989
General technical requirements for domestic satellite communication earth stations--General technical reguirements-Part 1: Common performance
Published on July 4, 1989
Implemented on March 1, 1990
Published by the State Administration of Technical Supervision
National Standard of the People's Republic of China
General technical requirements for domestic satellite communication earth stationsPart 1: Common performance performance
1 Subject content and scope of application
GB/T11443.1—1989
This standard specifies the classification of earth stations, antenna characteristics, broadband radio frequency characteristics and other basic performance requirements of earth stations, and also specifies the transmission performance and main parameters of various modulation methods. This standard applies to domestic satellite communication earth stations for fixed services (4/6GHz frequency band), not only to domestic satellite communication systems composed of domestic communication satellites, but also to domestic satellite communication systems composed of leased international communication satellite transponders. The former is referred to as "domestic satellite system" and the latter is referred to as "rented satellite system". This standard applies to public communication networks and private communication networks. This standard applies to the establishment and technical transformation of satellite communication earth stations. 2 Reference standards
GB3384 Network interface parameters for analog carrier communication systems GB7611 Network digital interface parameters for pulse code modulation communication systems GB11443.2 General technical requirements for domestic satellite communication earth stations Part 2: Frequency division multiplexing/FM carrier channels GB11443.3 General technical requirements for domestic satellite communication earth stations Part 3: Single channel per carrier channel GB11443.4 General technical requirements for domestic satellite communication earth stations Part 4: TV/FM carrier channels GB11444.1 Technical requirements for transmitting, receiving and ground communication equipment of domestic satellite communication earth stations Part 1: Frequency division multiplexing/FM equipment
GB11444.2 Technical requirements for transmitting, receiving and ground communication equipment of domestic satellite communication earth stations Part 2: Single channel per Carrier equipment
GB11444.3 Technical requirements for transmitting, receiving and ground communication equipment of domestic satellite communication earth stations Part 3: TV/FM equipment
GB11445.1 Technical requirements for terminal equipment of domestic satellite communication earth stations Part 1: Frequency division multiplexing terminal equipment GB11445.2 Technical requirements for terminal equipment of domestic satellite communication earth stations Part 2: Single-channel per-carrier terminal equipment 3 Terms and codes
3.1 Terms
3.1.1 Continuously variable slope delta modulation (CVSD) Continuously variable slope delta modulation is a type of delta modulation in which the quantization step changes continuously with the slope of the syllable of the speech signal. 3.1.2 Voice Activation In order to save satellite transmission power and improve communication capacity, when the input voice level reaches a certain threshold, SCPC sends a carrier wave, otherwise it does not send a carrier wave. It is a unique function of the SCPC system. 3.1.3 Forward Error Correction (FEC) The transmitting end sends a code that can correct errors. After receiving the error correction code, the receiving end automatically corrects the errors that occurred during transmission according to the decoding rules. 3.2 Code
3.2.1FDM/FM frequency division multiplexing/frequency modulation; 3.2.2SCPC/BPSK/CVSD single channel per carrier/two-phase phase shift keying/continuously variable slope incremental modulation; 3.2.3SCPC/QPSK/CVSD single channel per carrier/four-phase phase shift keying/continuously variable slope incremental modulation; 3.2.4TV/FM television/frequency modulation;
3.2.5dBc decibel number relative to the carrier. 4 Modulation mode
This standard specifies the transmission performance and main parameters of the following modulation modes: a.FDM/FM;
b.SCPC/BPSK (or QPSK)/CVSD (telephone) and SCPC/QPSK (data); c.TV/FM.
5 Earth station classification
According to the quality factor (G/T value) of the earth station in the system and its position in the network, it is divided into four standard levels: Class I station
Class II station
Class III station
Class IV station
G/T>31.7+201gf/4(dB/K)
G/T≥28.5+201gf/4(dB/K）
G/T≥23+201gf/4（dB/K）
G/T≥18.5+201gf/4（dB/K）bzxz.net
Note: ①G/T value is specified as the test value under the condition of antenna working elevation angle ≥10° and light breeze on a sunny day. ②f is the receiving frequency, GHz.
（3）
③ In domestic satellite systems and leased satellite systems, a Class I station includes a central station, a central station for public networks and a central station for private networks. Its G/T value can be higher than 31.7dB/K to facilitate the power utilization of the entire system. ④ Among the three types of stations, the G/T used for leased satellite systems is ≥24.5+201gf/4 (dB/K). 6 Earth station service capabilities
6.1 Class I station
6.1.1 When a Class I station is used as a central station, it should have the following performance: undertake the operation, operation and monitoring of the entire satellite system, and serve as a monitoring station for the communication management center. Transmit the reference pilot signal in the SCPC system. In the leased satellite system, it is responsible for official liaison with the International Satellite Organization (INTELSAT) and cooperates with INTELSAT to conduct network verification tests and commissioning tests for newly built earth stations. 6.1.2 When a Class I station is used as a central station, it should have the following performance: be responsible for the operation, operation and monitoring of this system. 6.1.3 Communicate with various stations (telephone, telegraph, data and fax). Intercommunication with Class I and II stations for telephone and other non-telephone services, and with Class III and IV stations for small-capacity SCPC telephone and other non-telephone services. It has a large communication capacity. 6.1.4 Send television signals, receive television signals and provide rebroadcasting. 6.1.5 When necessary, it should have the ability to transmit reference pilot signals as a reference pilot backup station for the SCPC system. 6.2 Class II station
6.2.1 Communicate with various stations (telephone, telegraph, data and fax). Intercommunication with Class I and II stations for telephone and other non-telephone services, and with Class III and IV stations for small-capacity SCPC telephone and other non-telephone services, and has a medium communication capacity. 6.2.2 Send television signals (domestic satellite system), receive television signals and provide rebroadcasting. 2
6.3 Category III stations
GB/T11443.1—1989
6.3.1 Intercommunication with Category I and II stations is SCPC telephone and other non-telephone services. 6.3.2 Receive television signals and provide relay when conditions are met. 6.4 Category IV stations
6.4.1 Category IV stations can intercommunication with Category I and II stations in small capacity SCPC telephone and other non-telephone services when technical conditions meet the requirements. 6.4.2 Receive TV signals.
7 Earth station equipment composition
The basic composition of earth station equipment includes:
Antenna subsystem;
Transmitter subsystem;
Receiving subsystem,
Ground communication equipment subsystem;
Terminal equipment subsystem;
Monitoring subsystem;
Power supply subsystem.
An earth station may have one or more antennas. The number of antennas depends on how many satellites need to communicate at the same time. my country's satellite communication system consists of two parts: "domestic satellite system" and "rented satellite system". Some large stations must have two or more antennas to meet the needs of communication and television. Antenna and receiving equipment subsystems are generally shared. The number of baseband to RF and RF to baseband equipment depends on the number and category of communication channels. The schematic diagram of the configuration of FDM/FM equipment of the earth station is shown in Figure 1. The schematic diagram of the configuration of SCPC equipment of the earth station is shown in Figure 2. The schematic diagram of the configuration of TV/FM equipment of the earth station is shown in Figure 3. 3
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Period standard
GB/T11443.1—1989
Figure 1 Schematic diagram of FDM/FM equipment configuration of earth station
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Division note
Pre-sale products
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Transmission equipment is good
Receiving certificate analysis
GB/T11443.1—1989
Meeting road map
Electric communication
China developed
China standard you
Receiving unit
Special certificate type
Total format
Figure 2 Earth station SCPC equipment configuration diagram
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Pre-conditions and approvals
Sky mixed system
Transmitting equipment in the system
Receiving equipment and warning equipment
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GB/T11443.1—1989
Energy physical test
Surface communication equipment
Earth station TV/FM equipment configuration diagram
Reasonable
8 System working frequency band
8.1 Transmitting working frequency band
GB/T11443.1—1989
Earth station must be able to work in any specified instantaneous bandwidth within the frequency band of 5925～6425MHz. For earth stations with conditions, it can be considered to work in the frequency band of 5850～6650MHz. 8.2 Receiving working frequency band
The receiving working frequency band is any instantaneous working bandwidth within the frequency band of 3700～4200MHz. The earth station must be able to receive any carrier within the above frequency band.
For earth stations with conditions, the receiving working frequency band of 3400～4200MHz can be considered. 9 Antenna subsystem
9.1 Antenna transmission side lobe characteristics
When the ratio of the antenna aperture diameter to the wavelength of the transmission carrier is D/>150, 90% of the number of antenna side lobe peaks that deviate from the main beam center and are greater than 1° shall not exceed the envelope specified by formula (5): G-29-251go (dBi)
Where: G-
(120°
(5)
Side lobe envelope gain relative to the omnidirectional radiating antenna in the direction within 3° north and south of the geostationary orbit (seen from the center of the earth station), dBi;
Angle from the main axis, in degrees.
Note: For the transmission side lobe characteristics of G=32-251go (dBi) (1 person 48) and||tt ||G=-10 (dBi) (0>48°) existing antennas should be modified, but can be allowed to continue to be used until 1990. For antennas with D/<150, 90% of the antenna sidelobe peaks shall not exceed the envelope specified by formula (6): G=52-101g (D/a)-251g (dBi) [(1002/DJ<<48G=10-101g (D/2)
9.2 Antenna receiving sidelobe characteristics
(>48°)
Deviating from the main beam center, 90% of the antenna sidelobe peaks greater than 1° shall not exceed the envelope specified by formula (8) and (9): G-32-251go (dBi)
1<48°
?>48°
Where: G ——In the direction within 3° north and south of the geostationary orbit, relative to the sidelobe envelope gain of the omnidirectional radiating antenna (seen from the center of the earth), dBi
9—The angle of deviation from the main axis, ().
9.3 Polarization
9.3.1 Polarization mode of transmission and reception
Domestic satellite system:
Linear polarization is adopted, and the polarization plane can be adjusted. Leased satellite system:
Adopting dual circular polarization, using the INTELSAT No. 5 satellite, the polarization mode of the Eastern Hemisphere beam is as follows: Earth station transmission: left circular polarization
Earth station reception: right circular polarization
9.3.2 Transmission and reception cross-polarization isolation or axial ratio Domestic satellite system:
Antenna cross-polarization isolation in the axial direction Degree>33dB. Antenna side lobe (off-axis 1°～10°) cross-polarization isolation ≥10dB. Satellite rental system:
GB/T11443.1—1989
The earth station's transmitting and receiving voltage axis ratio in the direction of satellite transmission is not greater than 1.06.9.4 Antenna pointing control capability
When the elevation angle of the earth station antenna is higher than 5°, the antenna pointing can be adapted to satellites at different positions in the geostationary orbit through automatic or manual methods.
9.5 Tracking method and capability
9.5.1 For large antennas (i.e. D/2≥150), automatic tracking is required. 9.5.2 For small antennas (i.e. D/2<150), manual tracking can be used under the condition that the pointing loss does not exceed 0.5dB. 9.5.3 All stations in the system are required to have manual tracking capabilities. 10 Transmitted carrier power stability
The equivalent isotropic radiated power (EIRP) of any carrier transmitted by the earth station should be kept within the range of -1.5 to +1dB/d except in severe weather conditions. This indicator includes four unstable factors: high power amplifier output power instability (including the influence of the pre-excitation circuit), antenna transmission gain instability, antenna pointing error and tracking error. The reference pilot transmission carrier power stability in the SCPC system should be ±0.5dB/d.
11 RF carrier frequency tolerance
The carrier frequency tolerance for all earth stations (including the initial deviation and long-term drift of the carrier frequency) shall not exceed the following values: SCPC carrier:
±250Hz
FDM/FM carrier:
±80kHz (bandwidth 2.5, 5MHz)
±150kHz (bandwidth>5MHz)
TV/FM carrier:
±250kHz
12 Radiation limits
12.1 Out-of-beam radiation EIRP density
In the direction of adjacent satellites, the allowable value of out-of-beam radiation EIRP density is specified as follows: 12.1.1 Radiation of FDM/FM, TV/FM systems D-32-251g6
D=35—251go
(2. 5° ≤ 0 < 7°)
(7°≤ 0 ≤ 9. 2°)
(9. 2° < 0 ≤ 48°)
(48°<≤180°)
Where: D is the EIRP energy density in a 4kHz bandwidth, dBW/4kHz; 9 is the angle from the main axis, in degrees. 12.1.2 Radiation of voice activated SCPC/PSK system D = 45—251g0
(2. 5°≤ 0< 48°) ·
(48°≤<180°)
Where: D is the EIRP energy density in a 40kHz bandwidth, dBW/40kHz; 9 is the angle from the main axis, in degrees. 12.2 Spurious radiation component
The spurious radiation EIRP (including single-frequency signals, band noise and other unwanted signals, but excluding intermodulation signals) transmitted by the earth station shall not exceed 4dBw/4kHz in any 4kHz band within the frequency bands of 5925~6425MHz and 14000~14500MHz outside the allocated frequency band.
12.3 RF out-of-band radiation
In the satellite system, the out-of-band intermodulation product EIRP generated by the multi-carrier application through the earth station shall not exceed 21dBW/4kHz when the antenna elevation angle is 10° in any 4kHz band in the frequency range of 5925~6425MHz; the correction factor for other elevation angles is -0.02(a-10)dB, where: a is the elevation angle of the earth station antenna, in degrees. 12.4 Carrier spectrum sidelobe limit
Outside the frequency band in use, the spectrum sidelobe of each transmitted digital carrier should be more than 26dB lower than the peak of the spectrum main lobe. 13 Official liaison
13.1 Principles of official liaison
a. Official circuits are mainly for the management and monitoring services of the entire central station system, and are used for daily business communications between earth stations: b. The public service system only includes the public service communication between the earth stations of the public communication network and the central stations of the private communication network (generally the first and second class stations). There is another pair of dedicated frequencies, c, for the public service communication between the earth stations of the private network. All the communication earth stations in the network, regardless of the communication method, should have at least one two-way public service circuit. 13.2 Frequency configuration
13.2.1SCPC public service
Public service communication uses two pairs of frequencies:
a.f1, f2 are used for public service communication between all earth stations in the system: b.f3, f. are used exclusively by the central station for public service communication between various stations. The specific frequencies of f1, f2, f3, f. are determined by the competent department. The central station should also have the ability to "broadcast" to the entire system through f1. 13.2.2FDM/FM official business
FDM/FM official business communication circuit is to insert two channels between 4 and 12kHz of baseband, set telephone channels at the low frequency end of each 4kHz band, and accommodate up to 5 frequency-shifted telex and telegraph circuits at intervals of 120Hz at the high frequency end. The frequency configuration is shown in Figure 4, and the unit in the figure is kilohertz.
13.3 Official business communication method
Figure 4 Frequency allocation
Central station, Class I station and Class II station and special network center station can communicate by telephone, telegraph or telephone and fax. Class III and IV stations can communicate by telephone and fax.
14 Earth station interface
14.1 Video and audio interface
14.1.1 Video interface
Input level: 1V, -p (positive polarity modulation)Input impedance: 75Ω
Output level: 1V, -p
Output impedance: 752
14.1.2 Audio interface
Input level: 0dBm
GB/T11443.1—1989
Input impedance: 600α (balanced and unbalanced channels each)Output level: 0dBm
Output impedance: 600Q (balanced and unbalanced channels each)14.2 Audio and basic group interfaces
The interface parameters of audio and basic group (telephone and non-telephone services) shall comply with the provisions of GB3384. The 64kbit/s digital interface is specified in the national standard GB7611.
15 Earth station availability
The availability of the earth station is closely related to the reliability of the single-machine equipment in each subsystem and the backup mode and conversion mode. Therefore, when selecting equipment in each subsystem, the use and maintenance should be considered. The reliability of the single machine should be good. The number of backup equipment can be comprehensively selected by each earth station according to the specific situation. However, for the public communication network, the overall availability design index of the earth station is 99.9%. For the private network, it can be specified by the user according to different usage requirements. 16 Earth station into the city circuit
The earth station into the city circuit refers to the relay line equipment from the input and output ends to the long-distance office (or user). Class I and Class II stations are located in the suburbs. Due to the different earth station environments and business requirements, the into the city circuit can use microwave relays, cables or optical fibers. The frequency bands used for microwave relays should avoid 3400~4200MHz, 5850~6650MHz, 10.7~11.2GHz, 14~14.5GHz. It is recommended to use the following frequency bands: 1900~2300MHz, 7780~8275MHz, 8200~8500MHz. The capacity series is divided into digital and analog modes! Digital mode: 34Mbit/s, 2X34Mbit/s. Analog mode: 960 channels/channel, 1800 channels/channel. Class III and IV stations do not need to enter the city circuit.
17 Earth station working conditions
17.1 Earth station environmental conditions
Environmental temperature
Cold zone 35~+40℃
Tropical zone -20~+55℃
Relative humidity
10%~100%
12%~100%
The earth station should be able to work continuously under the condition of 30m/s wind speed (equivalent to 910-level wind). 17.2 Earth station room conditions
The temperature in the room is 15~30℃; the relative humidity is 10%~75%. 10
GB/T11443.1—1989
The room should also consider measures such as shockproof, mildew-proof, dust-proof and anti-static. 17.3 Power supply
Earth stations should be powered by stable and reliable AC power supply and emergency standby oil generator sets (part of Class III stations depends on the specific situation).
Class II stations can be equipped with AC uninterrupted power supply system according to the power supply situation. Three-phase AC power supply, frequency should be 50±1Hz, voltage 380V, when the voltage deviates by ±38V, voltage stabilization or voltage regulation measures must be taken.
Single-phase AC power supply, frequency should be 50±1Hz, voltage 220V, when the voltage deviates by ±22V, voltage stabilization or voltage regulation measures must be taken.
Additional remarks:
This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Post and Telecommunications Industry Standardization Institute of the Ministry of Posts and Telecommunications. This standard is drafted by the First Institute of the Ministry of Posts and Telecommunications. The main drafter of this standard is Xu Shiyu.2 Audio and basic group interfaces at all levels
The interface parameters of audio and basic groups at all levels (telephone and non-telephone services) shall comply with the provisions of GB3384. For the 64kbit/s digital interface, please refer to the provisions of national standard GB7611.
15 Earth station availability
The availability of the earth station is closely related to the reliability of the single-machine equipment in each subsystem and the backup mode and conversion mode. Therefore, when selecting the equipment in each subsystem, the use and maintenance should be considered. The reliability of the single machine should be good. The number of backup equipment can be selected by each earth station according to the specific situation. However, for the public communication network, the overall availability design index of the earth station is 99.9%. For the private network, it can be specified by the user according to different usage requirements. 16 Earth station into the city circuit
The earth station into the city circuit refers to the relay line equipment from the input and output ends to the long-distance office (or user). Class I and Class II stations are located in the suburbs. Due to the different environments and business requirements of the earth stations, the into the city circuit can use microwave relays, cables or optical fibers. The frequency bands used for microwave relays should avoid 3400~4200MHz, 5850~6650MHz, 10.7~11.2GHz, 14~14.5GHz. It is recommended to use the following frequency bands: 1900~2300MHz, 7780~8275MHz, 8200~8500MHz. The capacity series is divided into digital and analog modes! Digital mode: 34Mbit/s, 2X34Mbit/s. Analog mode: 960 channels/channel, 1800 channels/channel. Class III and IV stations do not need to enter the city circuit.
17 Earth station working conditions
17.1 Earth station environmental conditions
Environmental temperature
Cold zone 35~+40℃
Tropical zone -20~+55℃
Relative humidity
10%~100%
12%~100%
The earth station should be able to work continuously under the condition of 30m/s wind speed (equivalent to 910-level wind). 17.2 Earth station room conditions
The temperature in the room is 15~30℃; the relative humidity is 10%~75%. 10
GB/T11443.1—1989
The room should also consider measures such as shockproof, mildew-proof, dust-proof and anti-static. 17.3 Power supply
Earth stations should be powered by stable and reliable AC power supply and emergency standby oil generator sets (part of Class III stations depends on the specific situation).
Class II stations can be equipped with AC uninterrupted power supply system according to the power supply situation. Three-phase AC power supply, frequency should be 50±1Hz, voltage 380V, when the voltage deviates by ±38V, voltage stabilization or voltage regulation measures must be taken.
Single-phase AC power supply, frequency should be 50±1Hz, voltage 220V, when the voltage deviates by ±22V, voltage stabilization or voltage regulation measures must be taken.
Additional remarks:
This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Post and Telecommunications Industry Standardization Institute of the Ministry of Posts and Telecommunications. This standard is drafted by the First Institute of the Ministry of Posts and Telecommunications. The main drafter of this standard is Xu Shiyu.2 Audio and basic group interfaces at all levels
The interface parameters of audio and basic groups at all levels (telephone and non-telephone services) shall comply with the provisions of GB3384. For the 64kbit/s digital interface, please refer to the provisions of national standard GB7611.
15 Earth station availability
The availability of the earth station is closely related to the reliability of the single-machine equipment in each subsystem and the backup mode and conversion mode. Therefore, when selecting the equipment in each subsystem, the use and maintenance should be considered. The reliability of the single machine should be good. The number of backup equipment can be selected by each earth station according to the specific situation. However, for the public communication network, the overall availability design index of the earth station is 99.9%. For the private network, it can be specified by the user according to different usage requirements. 16 Earth station into the city circuit
The earth station into the city circuit refers to the relay line equipment from the input and output ends to the long-distance office (or user). Class I and Class II stations are located in the suburbs. Due to the different environments and business requirements of the earth stations, the into the city circuit can use microwave relays, cables or optical fibers. The frequency bands used for microwave relays should avoid 3400~4200MHz, 5850~6650MHz, 10.7~11.2GHz, 14~14.5GHz. It is recommended to use the following frequency bands: 1900~2300MHz, 7780~8275MHz, 8200~8500MHz. The capacity series is divided into digital and analog modes! Digital mode: 34Mbit/s, 2X34Mbit/s. Analog mode: 960 channels/channel, 1800 channels/channel. Class III and IV stations do not need to enter the city circuit.
17 Earth station working conditions
17.1 Earth station environmental conditions
Environmental temperature
Cold zone 35~+40℃
Tropical zone -20~+55℃
Relative humidity
10%~100%
12%~100%
The earth station should be able to work continuously under the condition of 30m/s wind speed (equivalent to 910-level wind). 17.2 Earth station room conditions
The temperature in the room is 15~30℃; the relative humidity is 10%~75%. 10
GB/T11443.1—1989
The room should also consider measures such as shockproof, mildew-proof, dust-proof and anti-static. 17.3 Power supply
Earth stations should be powered by stable and reliable AC power supply and emergency standby oil generator sets (part of Class III stations depends on the specific situation).
Class II stations can be equipped with AC uninterrupted power supply system according to the power supply situation. Three-phase AC power supply, frequency should be 50±1Hz, voltage 380V, when the voltage deviates by ±38V, voltage stabilization or voltage regulation measures must be taken.
Single-phase AC power supply, frequency should be 50±1Hz, voltage 220V, when the voltage deviates by ±22V, voltage stabilization or voltage regulation measures must be taken.
Additional remarks:
This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Post and Telecommunications Industry Standardization Institute of the Ministry of Posts and Telecommunications. This standard is drafted by the First Institute of the Ministry of Posts and Telecommunications. The main drafter of this standard is Xu Shiyu.
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