Design Method of Anti-Co-channel Interference for L-Band SAR Satellite Navigation Receiver

Abstract

The present invention provides a design method of L-band SAR (synthetic aperture radar) satellite and navigation receiver anti-co-channel interference. According to the design method, an electronic microwave switch which works in a linkage manner with SAR pulse signals is additionally installed on a navigation receiver so as to suppress co-channel interference; the microwave switch is mainly used for isolating co-channel interference signals which are generated by an SAR load at the frequency point of the navigation receiver, the impulse power of the SAR load being higher than one kilowatt; the switching on and switching off of the microwave switch are controlled through timing signals generated by an SAR sub-system; compared with PRF (pulse repetition frequency) signals transmitted and received by the SAR sub-system, the timing signals are broadened; and the microwave switch is built in the navigation receiver in an integrated manner. With the design method adopted, the problem of the co-channel interference of an L-band SAR load and a global satellite navigation system can be solved, and the design of the SAR load is more free, navigation accuracy is ensured, and after-event processing is relatively simple.

Description

technical field [0001] The invention relates to the field of aerospace vehicles, in particular to a design method for an L-band SAR satellite navigation receiver to resist co-frequency interference. Background technique [0002] Frequency selection is a key parameter in the design of SAR (Synthetic Aperture Radar) satellites. Considering the effect of atmospheric electromagnetic transmission, SAR satellites at home and abroad mainly use five frequency bands: L, S, C, X, and Ku. Among them, compared with the other four frequency bands, the L frequency band has smaller time and space decorrelation effects. In order to ensure the correlation of the interference image and improve the processing accuracy, the L frequency band becomes the distribution of the application requirements for elevation surveying and differential deformation measurement. The preferred frequency band for conventional SAR satellite systems. [0003] But unfortunately, according to the regulations of ITU, ...

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Problems solved by technology

[0007] For the defects in the prior art, the purpose of the present invention is to provide a design method for L-band SAR satellite navigation receiver anti-same-frequency interference, which fundamentally solves the problem of the simultaneous interference between the L-band SAR satellite SAR load and the global satellite navigation system. The frequency interference problem makes the design of SAR load more free, and at the same time ensures the navigation accuracy, and the post-processing is relatively simpler

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