This standard specifies different subsystem combinations for measuring various performance characteristics of satellite communication earth stations; and gives definitions of relevant terms. The measurement methods described in Part 3 are applicable to the measurement of transmission characteristics of satellite communication earth stations that transmit frequency division multiplexing telephones, black and white televisions, and color televisions. These measurement methods are universal and can be used for measurements of combinations of two or more subsystems. Part 3 should be used together with Part 1 of this series of standards, "Common measurements for subsystems and subsystem combinations." GB/T 11299.11-1989 Measurement methods for radio equipment of satellite communication earth stations Part 3: Subsystem combination measurements Section 1: Overview GB/T11299.11-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of ChinabzxZ.net
Methods of measurement for radio equipment used in satellite earth stationsPart 3:Methods of measurements forcombinations of sub-systems
Section One-General
This standard is one of the standards in the series of "Methods of measurements for radio equipment used in satellite earth stations for satellite communication" GB 11299.11--- 89
IEC510-3-1(1981)
This standard is equivalent to the International Electrotechnical Commission standard IEC510-3-1 (1981) "Methods of measurement for radio equipment used in satellite earth stations for satellite communication Part 3:Methods of measurements forcombinations of sub-systems Section One-General". 1 Subject matter and scope of application
This standard specifies different subsystem combinations for measuring various performances of satellite communication earth stations; and gives definitions of relevant terms.
The measurement methods described in Part 3 are applicable to the transmission characteristics measurement of satellite communication earth stations that transmit frequency division multiplexing telephone, black and white television and color television. These measurement methods are universal and can be used for measurements of combinations of two or more subsystems. Part 3 should be used together with Part 1 of this series of standards, "Common measurements for subsystems and subsystem combinations". 2 Purpose
Part 3 provides definitions and methods applicable to subsystem combination measurements in order to evaluate the overall performance of satellite communication earth stations. Satellite communication earth stations can be regarded as composed of several subsystems. As for the evaluation of the space part of the satellite communication system, it does not fall within the scope of Part 3. 3 Supplementary definitions
The following definitions are supplementary to this series of standards GB11299.1. 3.1 Subsystem combination
A subsystem combination includes two or more subsystems that can fairly accurately describe the actual operation of a satellite communication earth station in its entirety or in part, and through their measurement results, the performance profile of the earth station can be predicted. 3.2 Typical subsystem combination
A typical subsystem combination is a subsystem combination suitable for the type test specified in Article 3.4 of this series of standards GB11299.1. It includes those subsystems with similar design features and similar manufacturing processes. The technical characteristics of these subsystems are within the normal characteristic range of the manufacturer.
Approved by the Ministry of Electronics Industry of the People's Republic of China on March 1, 1989 and implemented on January 1, 1990
4 General considerations
GB11299.11—89
Part 3 only involves special measurement methods for subsystem combinations. General measurement methods for subsystems and subsystem combinations are provided in this series of standards GB 11299.1~11299.5.
The measurement of subsystem combinations should be as close to the actual working conditions as possible, but it is often subject to various restrictions due to the following reasons: a. Due to the size and/or price of the equipment and the fact that they are still in the development stage when measured, some subsystem combinations are not suitable for this measurement method. For example, transmission lines, multi-channel sharing and switching equipment will appear in the above situation. b. The effects caused by some parameter changes can only be measured under actual working conditions, or due to their random characteristics, they require long-term statistical calculations, such as: the measurement of line performance changes under different environmental conditions. Due to these restrictions, when conducting specific subsystem combination tests, it is necessary to estimate the effects of those factors that are not included. In some cases, if appropriate measurements have been made, this estimate can be obtained by calculation. ! The inherent restrictions of subsystem combination tests should be properly considered, so that these restrictions will not cause significant errors in predicting the overall performance of the earth station system.
The details of the test need to be specified and agreed upon by the relevant departments. 4.1 Basic Typical Subsystem Combination Examples
Typical subsystem combinations can be divided into the following groups: Group A
a Modulator and demodulator.
b Transmitter (with or without modulator) and receiver (with or without demodulator). Note: In case "b", when a high-quality transponder with known performance is used, the entire earth station can be tested. When the transmitter output port is terminated with a specified load impedance, the earth station test except the antenna subsystem can be carried out. Group B
a. Transmitter section from baseband or intermediate frequency input port to power amplifier output port, which output port should be terminated with a specified load impedance.
Receiver section from low noise amplifier output port to intermediate frequency or baseband output port. c.
Antenna subsystem including RF multiplexing and switching equipment and low noise amplifier. Note: Using c\ combination, the quality factor, antenna directivity pattern and gain can be measured. Group C
Main components of earth station equipment including antennas, which are not pointed at satellites. Note:) By using the Group C combination, the degradation of receiving performance when the transmitter is working can be measured. (②) In order to avoid mutual interference with other satellites, the antenna must not be directed to any part of the geostationary orbit when it is oriented. 4.2 Evaluation of the overall performance of the earth station
When measuring the baseband-to-baseband characteristics, it is very important to obtain the expected results under actual operating conditions as accurately as possible. For the transmission of simulated signals, important characteristics such as noise and intermodulation interference should be determined from these measurement items. The sections of Part III will describe the measurements of simulated transmitter combinations or receiver combinations. If necessary, additional tests may be specified. Additional notes:
This standard was drafted by the 54th Institute of the Ministry of Electronics Industry. 120
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