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Non-linear software correction method of linear frequency modulated continuous wave radar

A calibration method, a technique of linear frequency modulation, applied in radio wave measurement systems, instruments, etc., can solve the problems of linear frequency modulation continuous wave radar frequency modulation nonlinearity and so on

Inactive Publication Date: 2013-01-30
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

[0003] The object of the present invention is to provide a nonlinear software correction method of chirp continuous wave radar, which can effectively solve the nonlinear problem of chirp continuous wave radar frequency modulation under low-cost applications

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  • Non-linear software correction method of linear frequency modulated continuous wave radar
  • Non-linear software correction method of linear frequency modulated continuous wave radar
  • Non-linear software correction method of linear frequency modulated continuous wave radar

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[0035] figure 1 It is the processing flow of the linear frequency modulation continuous wave radar nonlinear software correction method based on the fractional Fourier transform. figure 2 The principle block diagram of the FMCW radar software correction method based on fractional Fourier transform. The voltage-controlled oscillator is controlled by the linear control voltage to generate a frequency-modulated continuous wave, which is amplified by the power amplifier and sent to the transmitting antenna. The transmitting antenna radiates electromagnetic waves to the space and then sends back electromagnetic waves when it encounters a target. The receiving antenna receives the returned electromagnetic waves and sends them to the mixing frequency through low-noise amplification. The local oscillator of the mixer is the branch signal output from the VCO, the difference frequency signal after the frequency mixing is filtered and amplified, and the analog-to-digital conversion form...

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Abstract

The invention provides a non-linear software correction method of a linear frequency modulated continuous wave radar, belonging to the technical field of signal treatment and detection. The non-linear software correction method particularly comprises the following steps of: in a linear frequency modulated continuous wave radar receiver, carrying out analogue-to-digital conversion on amplified and filtered video echo receiving signals into digital signals; secondly, carrying out fractional order Fourier transform analysis on the digital echo signals; carrying out peak value search on a fractional order Fourier transform result in two dimensions of an order quantity and a transform frequency domain, wherein the fractional order and the frequency which correspond to a peak value show main and target time delay of non-linear frequency modulation; and calculating to obtain a frequency modulated non-linear parameter until the treatment process of the method can be completed. With the adoption of the method provided by the invention, the frequency modulated non-linear parameter can be obtained for establishing a non-linear correction reference function. The non-linear influence in the echo signals can be effectively removed by convolving the reference function and the radar echo signals.

Description

technical field [0001] The invention belongs to the technical field of signal processing and detection, in particular to a linear frequency modulation continuous wave radar nonlinear software correction method based on fractional Fourier transform. Background technique [0002] In recent years, due to the rapid development of digital signal processors promoted by ultra-large-scale integrated circuits and array processing technologies, micro-digital signal processors can be used to implement fast Fourier transform (FFT) to replace the analog narrowband filter bank structure, thereby greatly reducing the At the same time, the development of solid-state microwave and millimeter-wave devices has enabled the linear frequency-modulated continuous-wave radar to adopt a fully solid-state or even fully integrated structure. The combination of these two aspects has made the engineering realization of linear frequency modulation continuous wave radar easy, and has the characteristics o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 张军
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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