Large-size SAR antenna multipath effect analysis method

Abstract

The invention discloses a large-size SAR antenna multipath effect analysis method. The method comprises three parts of satellite analysis model establishment, multipath interference positioning analysis and multipath interference parameter analysis. According to the method, on one hand, the position where the multipath effect is generated can be positioned, and targeted design improvement of a satellite system is facilitated; on the other hand, specific parameters of the multipath effect can be analyzed, and evaluation of the influence degree of multipath interference on the satellite system is achieved. According to the method, the multipath effect can be analyzed and evaluated in the satellite scheme design stage, and the problem that the cost-benefit ratio of interference rectification is high in the later test process is solved.

Description

technical field [0001] The invention belongs to the technical field of satellite multipath effects, and in particular relates to a large-scale SAR antenna multipath effect analysis method. Background technique [0002] In order to ensure that the payload has greater transmit power and higher receive sensitivity, high-orbit SAR satellites often use reflector structure antennas with a size of tens of meters. At the same time, high-orbit SAR satellites will use GNSS and other systems for precise orbit determination of satellites. For the precision orbit determination system, it is expected to receive the signal directly transmitted by the ground station or the navigation satellite. In fact, due to the complexity of the satellite surface structure and layout, the precision orbit determination system not only receives the expected direct signal, but also receives the signal reflected by the direct signal on the satellite, that is, the multipath interference signal. This kind of...

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Problems solved by technology

[0005] As for the interference caused by satellite multipath effect, it is mainly carried out through compact field test or far field test at present, and there is no multi-satellite system with relatively many arrangements in a relatively small space, complex structure and high sensitivity of radio frequency system. Accurate Analysis Method of Diameter Effect

For the test evaluation method, it is usually carried out in the middle and late stages of satellite development. On the one hand, it is impossible to find problems in advance so that targeted design improvements can be made. In the middle and later stages, it is expected that the satellite system will be developed and then tested. It is often very difficult to implement improvement measures after problems are found; On the other hand, the cost of experimental evaluation method is much higher than the cost of simulation analysis

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