Intra-pulse double-frequency velocity dealiasing and distance fuzzy method and system

Abstract

The present invention discloses an intra-pulse double-frequency velocity dealiasing and distance fuzzy method and system. The system comprises an emission system and a receiving system, and also comprises a dual-way digital waveform generation module, a digital intermediate frequency reception module and a Doppler signal processing module. The dual-way digital waveform generation module generates two emission excitation signals with different frequencies, outputs the emission excitation signals to an emission system and emits the emission excitation signals to a space through an antenna, echo signals received by the antenna are processed through the receiving system to obtain intermediate frequency signals, the digital intermediate frequency reception module receives the intermediate frequency signals, echo signals with two frequencies which are respectively received and processed to zero intermediate frequency by two corresponding digital filters are generated according to the corresponding emission frequency difference, and the processed signals are output to the Doppler signal processing module, and the Doppler signal processing module performs corresponding ambiguity resolution processing so as to realize velocity dealiasing and distance fuzzy.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a method and system for intrapulse dual-frequency back-off velocity ambiguity and distance ambiguity. Background technique [0002] The weather radar digital signal processing system is mainly to estimate the intensity, radial velocity and spectral width of the weather echo, so as to obtain the wind field and other information of the echo signal intensity. For a radar with a fixed pulse repetition frequency, its maximum unambiguous speed is expressed by (1) formula. [0003] [0004] In the formula: [0005] V max : maximum unambiguous speed; [0006] λ: radar wavelength; [0007] PRF: Radar pulse repetition frequency. [0008] Its maximum unambiguous distance is represented by (2) formula. [0009] [0010] In the formula: [0011] R max : maximum unambiguous distance; [0012] C: The speed of light. [0013] Therefore, the product of the maximum unambiguou...

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Problems solved by technology

[0017] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method and system for intrapulse dual-frequency retreat velocity ambiguity and distance ambiguity, which can simultaneously solve the problems of velocity ambiguity and distance ambiguity in weather radar applications. The contradiction between ambiguity and speed ambiguity, the dual-frequency digital waveform is transmitted in the pulse, the excitation signal generated by the digital waveform adopts different frequencies in the pulse, the digital receiving channel is separated by different digital filters, and the separated dual-frequency feedback in the pulse The wave signal is output to the Doppler signal processing unit for processing, so as to eliminate velocity ambiguity and distance ambiguity at the same time

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