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A High Linearity Phase Demodulation Realization Method for Coherent Phase Tracking of fmcw Radar

A technology of phase demodulation and implementation method, which is applied in the direction of radio wave measurement systems and instruments, can solve problems such as phase ambiguity, and achieve the effect of high linear phase demodulation

Active Publication Date: 2022-07-15
上海希卡立科技有限公司
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Problems solved by technology

However, this technology will face phase ambiguity problems in the phase analysis process, especially when measuring large displacements (movement amplitudes exceeding half a wavelength), it will face serious phase ambiguity problems

Method used

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  • A High Linearity Phase Demodulation Realization Method for Coherent Phase Tracking of fmcw Radar
  • A High Linearity Phase Demodulation Realization Method for Coherent Phase Tracking of fmcw Radar
  • A High Linearity Phase Demodulation Realization Method for Coherent Phase Tracking of fmcw Radar

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Embodiment Construction

[0018] like figure 1 As shown, the FMCW radar system applied in this embodiment includes: a phase-locked loop, a radio frequency module, an intermediate frequency amplifying module, an analog-to-digital converter (ADC), and a microcontroller unit (MCU), wherein: the MCU generates a phase-locked loop by configuring the phase-locked loop. Different modulation waveforms are used to achieve corresponding modulation modes. The modulation waveform generated by the phase-locked loop is input to the voltage-controlled oscillator (VCO) and generates a transmission signal. The transmission signal is transmitted to the detection target through the transmission antenna TX and scatters, resulting in modulation and detection. The reflected signal of the target motion information is received by the receiving antenna RX. The received signal obtained by the receiving antenna and the transmitting signal respectively obtain the beat frequency signal through the quadrature difference multiplier. A...

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Abstract

A high-linear phase demodulation implementation method for coherent phase tracking of FMCW radar, by converting the beat frequency signal s of the receiving end b Each M point in (p) is taken as a row to obtain the detection matrix I N×M , for the detection matrix I N×M Perform FFT on each row to get the frequency domain matrix RP N×M , take the column m where the target is located in the matrix 0 The data RP(n, m 0 ), realize the reconstruction of CW radar signal, and obtain the quadrature CW radar intermediate frequency signal: eq_I(n)=real(RP(n, m 0 )), eq_Q(n)=imag(RP(n, m 0 )), where: real and imag represent the real part and the imaginary part, respectively, and then demodulate with the EDACM algorithm to obtain the motion trajectory of the detection target. The invention solves the phase ambiguity problem faced in the coherent phase target tracking process of the FMCW radar by reconstructing the single-frequency continuous wave (CW) radar signal and demodulating the EDACM algorithm on the received radar information signal.

Description

technical field [0001] The invention relates to a technology in the field of frequency modulation radar detection, in particular to a high linear phase demodulation implementation method for coherent phase tracking of a millimeter wave radar. Background technique [0002] The coherent phase target tracking algorithm based on frequency modulated continuous wave (FMCW) radar greatly improves the accuracy of FMCW radar relative motion measurement. movement trajectory. However, in the process of phase resolution, this technology will face the problem of phase ambiguity, especially when measuring large displacements (movement amplitude exceeding half a wavelength), it will face serious phase ambiguity problems. SUMMARY OF THE INVENTION [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a high linear phase demodulation implementation method for coherent phase tracking of FMCW radar. The EDACM algorithm demodulates and solves th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/292G01S7/41
CPCG01S7/2923G01S7/415
Inventor 顾昌展刘劲涛毛军发
Owner 上海希卡立科技有限公司
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