Anti-interference algorithm FPGA realization method based on covariance matrix characteristic decomposition and realization device thereof

Abstract

The invention discloses an anti-interference algorithm FPGA realization method based on covariance matrix characteristic decomposition and a realization device thereof, and belongs to the technical field of anti-interference. Intermediate frequency signals inputted by an antenna array are converted into baseband signals by adopting a digital down conversion module; the baseband signals after down conversion of N channels are compensated by a channel consistency monitoring and compensation module; a covariance matrix calculation module calculates the covariance matrix of the compensated signals; characteristic decomposition is performed on the covariance matrix by a covariance matrix characteristic decomposition module so that characteristic values and characteristic vectors are obtained; and weighting is performed by a weighing output module according to the obtained characteristic vectors so that an optimal weight value is obtained, and finally the signals after anti-interference are outputted. Resource occupation is low and weight update speed is high in FPGA realization, and the channel consistency detection and compensation module is additionally arranged before inputting of the signals so that loss of interference suppression capacity caused by channel inconsistency can be reduced and robustness of an anti-interference algorithm can be enhanced.

Description

Technical field [0001] The invention belongs to the field of anti-jamming technology, and specifically relates to an FPGA implementation method and an implementation device of an anti-jamming algorithm based on the characteristic decomposition of a covariance matrix. Background technique [0002] In the Iraq War, the U.S. military used GPS (Global Positioning System) precision guidance technology on an unprecedented scale, and the hit rate of weapons guided by GPS technology increased sharply, which became one of the key factors affecting the war situation. With the end of the war, people’s understanding of satellite navigation has gradually deepened. After decades of development, many countries have their own satellite navigation systems (including China’s Beidou system). These systems are collectively referred to as the Global Navigation Satellite System (Global Navigation Satellite System, GNSS). ), GNSS has played a huge advantage in the military and civilian fields, and has ...

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Problems solved by technology

[0005] The present invention aims at the problem that the anti-jamming algorithm FPGA based on eigendecomposition mentioned in the prior art is difficult to realize, and proposes an FPGA implementation method and implementation device of an anti-jamming algorithm based on covariance matrix eigendecomposition. The amount is small, and the weight update speed is fast, which effectively improves the anti-interference ability

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