Doppler direction-finding method

Abstract

The invention discloses a method for improving Doppler direction-finding precision and mainly solves a problem of unroundness of Doppler direction finding in the prior art. The implementation scheme includes 1, performing band pass filtering on received signals; 2, performing accumulation pre-treatment on data subjected to filtering; 3, multiplying the accumulated data with local oscillation signals so as to obtain complex baseband signals; 4, performing frequency discrimination computation on the complex baseband signals and replacing a prior local oscillation frequency with a result obtained through computation; 5, performing phase discrimination computation on the complex baseband signals and replacing a prior local oscillation phase with a result obtained through computation;6, performing calculation on the complex baseband signals through a rotating vector method and estimating incoming wave angles. According to the invention, the unroundness is reduced, easy implementation is achieved and the direction finding precision is high; the method is applicable to a single-channel Doppler direction-finding system.

Description

technical field [0001] The invention belongs to the technical field of direction finding and positioning and signal processing, and specifically designs a Doppler direction finding method capable of improving direction finding accuracy, which can be used in a single-channel Doppler direction finding system. Background technique [0002] With the development of radio communication information technology and the increase of modern application scenarios, radio direction finding equipment is becoming more and more popular, and Doppler direction finding technology has also been greatly developed. In the past century, the development momentum of the Doppler direction finder is very strong. Major manufacturers at home and abroad have adopted many new technologies and algorithms, which have greatly promoted the more accurate direction of the Doppler direction finder. , sensitivity, and small polarization errors, the performance of the Doppler direction finder has also been greatly i...

AI Technical Summary

Problems solved by technology

[0005] 1. The influence of the antenna phase difference on the direction finding accuracy is not considered and eliminated, which makes the accuracy rate of the algorithm decrease or even fail;

[0006] 2. It does not consider that different antennas have different initial phases, resulting in errors during phase detection, resulting in the occurrence of direction finding non-circularity;

[0007] 3. The algorithm is complex and difficult to implement on a small-capacity FPGA chip

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