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A method to balance ranging accuracy and computation load

A technology of ranging accuracy and computation amount, applied in the field of balancing ranging accuracy and computation amount, it can solve the problems of large computation amount, system crash, excessive computation amount, etc., so as to meet real-time requirements, balance ranging accuracy and computation amount, etc. volume increase effect

Active Publication Date: 2018-03-06
DALIAN ROILAND SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Binomial fitting is a kind of interpolation algorithm. If binomial fitting estimates the peak value of the spectrum, the accuracy of spectrum estimation is not high. If CZT or wavelet analysis is used, the amount of calculation will be very large, especially when the number of targets is large. , if CZT is performed on each spectrum peak, the system may even crash due to the large amount of computation

Method used

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  • A method to balance ranging accuracy and computation load
  • A method to balance ranging accuracy and computation load
  • A method to balance ranging accuracy and computation load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The method of balancing the ranging accuracy and the amount of calculation, set the data length Data_N to 996, the number of FFT transformation points FFT_N to 1024, the data to be analyzed is Czt_sig, the points obtained by CZT are Czt_Pp_M, and the number of targets is obtained according to the threshold detection module N_mubiao and the position k1 of each target in the spectrum (the peak point position of the target spectrum);

[0047] If the number of targets N_mubiao4, then use CZT to calculate the peak position for the first N1 judged targets, and use CZT for other data The binomial fit calculates the peak position, and the beat frequency is obtained according to the peak position.

[0048] The steps for calculating the peak position of the CZT are specifically:

[0049] S1: Calculate the initial phase angle of the CZT transformation according to the position k1 of the target

[0050] Czt_qs_jd=2*π*(k1-1) / Data_N

[0051] Initialize the vector length of the sam...

Embodiment 2

[0064] This embodiment takes the ranging of the triangular wave as an example for illustration. The data length Data_N, the number of FFT transformation points FFT_N, and the sampling rate are fs. If the number N_mubiao of targets detected by the threshold is less than N1, only CZT transformation is performed to improve the accuracy of spectrum calculation and The range resolution of the target. If the number of targets N_mubiao is greater than N1, CZT transformation is performed on the important N1 targets to improve the spectrum calculation accuracy and the distance resolution of the targets, while for the remaining targets, quadratic polynomial fitting is used to calculate the peak point of the spectrum to improve the spectrum Calculation accuracy, thereby improving the distance calculation accuracy.

[0065]In this design, the polynomial adopts y=-a*(x-b) 2 +c, where a, b, and c are the coefficients to be determined, x is the position of the data to be processed in the sp...

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Abstract

The invention provides a ranging accuracy and computation burden equalizing method. Data length is set as Data_N, FFT transformation point number is set as FFT_N, data required to be analyzed are set as Czt_sig, the point number obtained through CZT is Czt_Pp_M, and the target number N_mubiao and the position k1 of each target in the spectrum are obtained according to a threshold detection module; if the target number N_mubiao<=N1, CZT peak position computation is performed on the point and two points before and after the point; and if the target number N_mubiao>N1, CZT peak position computation is performed on the judged previous N1 targets, peak position computation is performed on other data by adopting binomial fitting, and offset frequency is obtained according to the peak position. According to the method, resolution in range and resolution at the main target can be guaranteed, and the real-time requirement of the system can also be met on the basis of existing hardware.

Description

technical field [0001] The invention belongs to the technical field of ranging accuracy, and specifically relates to a method for balancing ranging accuracy and calculation amount. Background technique [0002] In order to improve the distance measurement accuracy, it is necessary to improve the estimation accuracy of the spectrum peak. The methods that can be used include interpolation algorithm for the spectrum interval to be analyzed, CZT (chirp Z transform), or wavelet analysis. [0003] Binomial fitting is a kind of interpolation algorithm. If binomial fitting estimates the peak value of the spectrum, the accuracy of spectrum estimation is not high. If CZT or wavelet analysis is used, the amount of calculation will be very large, especially when the number of targets is large. , if CZT is performed on each spectrum peak, the system may even crash due to the large amount of computation. Contents of the invention [0004] In view of the above-mentioned shortcomings or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S11/00G01S13/08
CPCG01S11/00G01S13/08
Inventor 田雨农苏鹏达周秀田史文虎
Owner DALIAN ROILAND SCI & TECH CO LTD