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

Abstract

This invention relates to a digital signal processing method for multi-channel high-frequency radar receiver. Sampling the MF signal by band-pass sample for orthogonal decomposition; obtaining the in-phase component I and orthogonal component Q by digital orthogonal transformation based on multi-phase filter for extract respectively; taking the I and Q in one group as the real and imaginary part of a complex signal respectively for complex FFT; multiplying a phase-shift factor e-j*w(k) to every FFT result for accumulation, and then obtaining the distance information. Instead of prior art, This invention saves almost complete echo information, reduces operation amount, and improves system efficiency.

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 pr...

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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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