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Phase self-calibration method for motion measurement of asynchronous FMCW radar system

A technology of radar system and motion measurement, which is applied in the direction of radio wave measurement system, instrument, etc., to achieve the effect of improving robustness

Active Publication Date: 2021-06-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] Aiming at the phase offset problem in the process of accurate measurement of the motion information of the target object based on the coherent phase target tracking algorithm in the existing asynchronous FMCW radar system, the present invention proposes a phase self-calibration method for the motion measurement of the asynchronous FMCW radar system, which does not need to be prone to errors The cumbersome calibration process does not require special offset parameter measurements for specific FMCW radar systems, which greatly improves the robustness of phase compensation and calibration

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  • Phase self-calibration method for motion measurement of asynchronous FMCW radar system

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Embodiment Construction

[0020] Such as figure 2 As shown, the asynchronous FMCW radar system applied in this embodiment includes: a radar module, a phase-locked loop, an intermediate frequency amplification module, an analog-to-digital converter (ADC) and a micro control unit (MCU), wherein: the MCU generates Different modulation signals are used to realize the corresponding modulation mode. The modulation signal generated by the phase-locked loop is input to the radar module, and the radar module is driven to generate a quadrature beat frequency signal, which is then amplified by the intermediate frequency amplification module. The amplified quadrature beat frequency signal and the modulation signal are passed through After the ADC is asynchronously sampled, the MCU adopts synchronous cutting to obtain discrete quadrature beat frequency signals, and restores the motion information of the detection target.

[0021] Described modulation, the carrier that adopts is sawtooth wave or triangular wave mod...

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Abstract

A phase self-calibration method for motion measurement of an asynchronous FMCW (Frequency Modulated Continuous Wave) radar system comprises the following steps: reconstructing a complex field beat frequency signal from an orthogonal beat frequency signal of a receiving end, synchronously cutting the complex field beat frequency signal, taking each segment as a row, forming a detection matrix in sequence, converting the detection matrix to a frequency domain, performing phase analysis on a corresponding frequency domain matrix, and obtaining a target motion track. The method does not need a tedious calibration process which is liable to make mistakes, does not need to carry out special offset parameter measurement for a specific FMCW radar system, and greatly improves the robustness of phase compensation and calibration.

Description

technical field [0001] The invention relates to a technology in the field of frequency modulation radar detection, in particular to a phase self-calibration method for motion measurement of an asynchronous FMCW radar system. Background technique [0002] The coherent phase target tracking algorithm based on frequency modulated continuous wave (FMCW) radar greatly improves the accuracy of relative motion measured by FMCW radar, but due to the asynchronous problem of the circuit system itself, that is, the sampling clock and the FMCW pulse period are not synchronized, the small asynchronous error It will accumulate over time, resulting in a linear deviation added to the phase information. If no compensation is performed, the measurement will lose accuracy, such as figure 1 shown. [0003] The existing phase compensation method measures the additional linear change of each frequency point of each specific radar system in advance, obtains the corresponding offset parameters, an...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 顾昌展刘劲涛张跃平毛军发
Owner SHANGHAI JIAO TONG UNIV
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