Triangular wave frequency modulation short-range detection system speed measurement and distance measurement method
A technology of detection system and ranging method, which is applied in the field of short-range detection, can solve the problems of increasing data processing capacity, the influence of speed measurement and range measurement accuracy, real-time performance and speed measurement accuracy limitations, and achieve the effect of reducing errors
Inactive Publication Date: 2018-10-26
NANJING UNIV OF SCI & TECH
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Problems solved by technology
In actual signal processing, the resolution and fence effect of FFT transformation will affect the speed and distance measurement accuracy of the system
[0003] The commonly used under-sampling speed measurement method needs to balance the real-time speed measurement and the frequency accuracy of the Doppler signal, and the real-time and speed measurement accuracy are limited.
FFT+CZT frequency measurement method can improve frequency accuracy, but the improvement of accuracy is affected by the number of FFT points and CZT points. Increasing the number of points in the same frequency sweep time not only needs to increase the sampling rate, but also increases the amount of data processing.
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[0060] This embodiment adopts the following system parameters: triangular wave chirp system, sweep period T m =8us, frequency deviation ΔF=100MHz, target movement distance 30m~10m, movement speed 350m / s, difference frequency sampling rate f s = 100MHz.
[0061] Such as figure 1 As shown, the present invention includes the following steps:
[0062] (1) All-phase data preprocessing: the difference frequency signal is subjected to all-phase data preprocessing, that is, a convolution window w is used c The long (2N-1) data vector centered on x(0) is weighted, and then shifted and summed.
[0063] (2) FFT phase measurement: The phase value on the main spectrum line is measured by the FFT method on the preprocessed data and the unprocessed data.
[0064] (3) Phase difference correction: The difference between the phase spectrum on the traditional FFT main spectrum line and the full-phase FFT phase spectrum is proportional to the frequency offset value to obtain an estimate of the signal freq...
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The invention relates to a triangular wave frequency modulation short-range detection system speed measurement and distance measurement method. By use of full phase position Fourier transform phase position difference frequency measurement, i.e., Fourier transform and full phase position Fourier transform are performed on difference frequency signals to solve phase positions; by use of the phase position difference to correct the Fourier transform frequency measurement, so difference frequency with quite high accuracy and Doppler frequency with quite high accuracy are obtained. According to the invention, by use of the phase position invariance of the full phase position Fourier transform, the difference frequency is successfully corrected, so the precision of speed measurement and distance measurement is improved.
Description
Technical field [0001] The invention relates to a short-range detection technology, in particular to a speed and distance measurement method of a triangular wave frequency modulation short-range detection system. Background technique [0002] At present, the linear frequency modulation short-range detection system has been widely used in various fields due to its small size, simple structure, high precision, and low cost. In actual signal processing, the resolution and fence effect of the FFT transform will affect the speed and range accuracy of the system. [0003] Commonly used under-sampling velocity measurement methods need to balance the real-time performance of velocity measurement and the frequency accuracy of the Doppler signal, so both real-time performance and velocity measurement accuracy are limited. The FFT+CZT frequency measurement method can improve the frequency accuracy, but the improvement of the accuracy is affected by the number of FFT points and the number of ...
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IPC IPC(8): G01S13/58
CPCG01S13/584
Inventor 赵惠昌范婉华范利光刘倩云邢娇范聿杰
Owner NANJING UNIV OF SCI & TECH