Determination Method of In-band Interference Sources for Highly Sensitive Receiving Equipment Antennas in Microwave Payload Satellites
A technology for receiving equipment and determining methods, applied to instruments, measuring devices, measuring electronics, etc., can solve problems such as interference, achieve the effects of avoiding interpretation delays and improving test accuracy
Active Publication Date: 2019-09-06
BEIJING INST OF SPACECRAFT SYST ENG
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[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, propose a method for determining the interference source in the antenna band of the high-sensitivity receiving equipment in the microwave payload satellite, and quickly and accurately locate the position of the interference source, the interference working condition and the degree of interference, So as to solve the problem of electromagnetic interference in the satellite system and achieve the purpose of directly improving the efficiency of the system's electromagnetic compatibility test
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[0086] The 3rd harmonic of 2.228GHz transmission frequency of the measurement and control transponder of a microwave remote sensing satellite fell into the 350MHz frequency band of the 6.6G receiving channel of a high-sensitivity receiving device (microwave radiometer).
[0087] 1) If the interference path is directly radiated and coupled to the receiving antenna through the transmitting antenna, the transmission power of the transmission channel of the measurement and control transponder is 26dBm, and the path attenuation is 3dB. As a result, the 3rd harmonic suppression is better than 58dB, the sensitivity of the load receiver is better than -118dBm, and the isolation between the antennas of the two subsystems is 87dB through the RM star test. Through the above formula, the interference margin is estimated to be 11dB after calculation (the host ) has interference, -4dB (standby) has no interference.
[0088] 2) If the interference path is coupled to the receiving antenna thr...
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The invention discloses a method for determining in-band interference sources of a high-sensitivity receiving equipment antenna in a microwave load satellite. The method comprises the steps of firstly placing the whole microwave load satellite in a standard shielding darkroom environment; then determining potential interference pairs taking the high-sensitivity receiving equipment antenna as a receiving party; then calculating the interference margin of each potential electromagnetic interference pair, and determining interference sources of the potential electromagnetic interference pairs with the interference margin being greater than a preset threshold to be potential interference sources; thereafter, firstly enabling high-sensitivity receiving equipment to be powered on, then sequentially loading the potential interference sources according to the order of the interference margin from small to large, and determining the potential interference sources to be in-band interference sources of the high-sensitivity receiving equipment antenna if the high-sensitivity receiving equipment is abnormal in operating state after the potential interference sources are completely loaded. The test method realizes direct positioning for interference sources, interference conditions and the interference intensity, verifies an electromagnetic interference problem in a satellite system, and achieves the purpose of directly improving the system electromagnetic compatibility test efficiency.
Description
technical field [0001] The invention relates to a test item and method in a whole-satellite electromagnetic compatibility test, in particular to a method for determining an interference source in an antenna band of a high-sensitivity receiving equipment in a microwave-loaded satellite, and belongs to the technical field of electromagnetic compatibility. Background technique [0002] Modern marine dynamic environment satellites and high-resolution SAR payload satellites are microwave remote sensing satellites. The main task of such satellites is to use microwave payloads to obtain the characteristics of the earth's surface, including sea surface wind field, waves, currents, sea surface temperature, sea storms and tides, etc. It has wide application prospects in ocean monitoring and monitoring, disaster monitoring and assessment, land surveying and urban development planning, agriculture, forestry, geology, hydrology, etc. In order to obtain high-precision remote sensing data, ...
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IPC IPC(8): G01R31/00
Inventor 周丽萍张庆君王建军刘杰张华程丽丽
Owner BEIJING INST OF SPACECRAFT SYST ENG