Digital signal processing method for multi-channel high-frequency radar receiver

Abstract

A digital signal processing method for a multi-channel high-frequency radar receiver, which adopts a band-pass sampling method to sample an intermediate frequency signal, performs orthogonal decomposition on the sampled data, and adopts a method of digital orthogonal transformation based on polyphase filtering to obtain The in-phase component I and the quadrature component Q are characterized in that: the I-way and Q-way signal data after the orthogonal decomposition are respectively grouped and extracted, and the in-phase component I and the quadrature component Q of each group are respectively used as the complex number of the group The real and imaginary components of the signal are subjected to the complex FFT operation of the group, and the FFT operation results of each group are multiplied by a phase shift factor e-j*w(k) for accumulation to obtain distance information. The present invention adopts the idea of ​​group extraction and FFT phase compensation and accumulation, and replaces the traditional anti-aliasing filter extraction method. Since the sampling data is not filtered, relatively complete echo information is retained, and the amount of calculation is reduced at the same time. the efficiency of system operation.

Description

technical field [0001] The invention relates to a digital signal processing technology of a multi-channel radar receiver and a multi-channel data collection and processing technology. Background technique [0002] High-frequency ground wave radar (HFSWR) plays a huge role in ocean detection. In order to solve the large amount of data caused by the high analog-to-digital conversion rate in the digital receiver of high-frequency radar, which affects the speed of subsequent data processing, For the fast Fourier transform (FFT), which is commonly used in signal processing, a large amount of input data will lead to low computing efficiency, so digital down-conversion is often used to reduce the data rate. In traditional high-frequency radar receiver digital The scheme often used in signal processing is: after orthogonal decomposition of the sampled data, the digital down-conversion method of "anti-aliasing filter extraction" is used, and then FFT processing is performed on the ex...

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Problems solved by technology

[0002] High-frequency ground wave radar (HFSWR) plays a huge role in ocean detection. In order to solve the large amount of data caused by the high analog-to-digital conversion rate in the digital receiver of high-frequency radar, which affects the speed of subsequent data processing, For the fast Fourier transform (FFT), which is commonly used in signal processing, a large amount of input data will lead to low computing efficiency, so digital down-conversion is often used to reduce the data rate. In traditional high-frequency radar receiver digital The scheme often used in signal processing is: after orthogonal decomposition of the sampled data, the digital down-conversion method of "anti-aliasing filter extraction" is used, and then FFT processing is performed on the extracted data; in the data processing process Among them, when the decimation factor n is large, the order N of the anti-aliasing filter is high, which reduces the efficiency of the system operation; The information of the frequency components is lost, which affects the subsequent signal processing and analysis

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