A Doppler measurement method to solve the problem of target moving across range units

A technology of distance unit walking and measurement methods, applied in the field of measurement applications, can solve the problems of signal-to-noise ratio loss and detection performance degradation, and achieve the effects of reducing signal-to-noise ratio loss, improving measurement accuracy, and increasing the probability of being detected

Active Publication Date: 2020-08-14
CSIC WUHAN LINCOM ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the moving target detection of high-speed targets, due to the different echo pulses moving across the distance unit, the accumulated pulse number of the traditional MTD will decrease, resulting in a decrease in detection performance. Therefore, in view of the above problems, a Doppler measurement method is proposed to solve the target cross-distance unit walking

Method used

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  • A Doppler measurement method to solve the problem of target moving across range units
  • A Doppler measurement method to solve the problem of target moving across range units
  • A Doppler measurement method to solve the problem of target moving across range units

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1As shown, select a target with a velocity of 400m / s, and perform 512-order filtering on it. Step A, determine the minimum velocity v1 and maximum velocity v2 in the radial direction of the target detected by the radar; Step B, radar sampling rate fs, distance resolution Rmin is fs*c / 2, where c is the speed of light. Step C, the radar repetition period is T, the slowest target cross-distance unit needs t1=Rmin / v1, the fastest target cross-distance unit needs t2=Rmin / v2, n1=t1 / T, n2=t2 / T; in step D N 1 is the largest integer power of 2 not greater than n1, N m is the largest integer power of 2 not greater than n2. Step E, at N 1 and N m There are m integer powers of 2 between them (N 1 , N 2 ...N m ), considering N m It may be very large, and m is also very large. At this time, choose an appropriate number of filter banks m 1 , if m is small, take m 1 =m. Step F, sort and align the sampled echoes according to time, and the number of accumulated...

Embodiment 2

[0045] Such as figure 2 As shown, select a target with a velocity of 400m / s, and perform 1024-order filtering on it. Step A, determine the minimum velocity v1 and maximum velocity v2 in the radial direction of the radar detection target; Step B, radar sampling rate fs, distance resolution Rmin is fs*c / 2, where c is the speed of light. Step C, the radar repetition period is T, the slowest target cross-distance unit needs t1=Rmin / v1, the fastest target cross-distance unit needs t2=Rmin / v2, n1=t1 / T, n2=t2 / T; in step D N 1 is the largest integer power of 2 not greater than n1, N m is the largest integer power of 2 not greater than n2. Step E, at N 1 and N m There are m integer powers of 2 between them (N 1 , N 2 ...N m ), considering N m It may be very large, and m is also very large. At this time, choose an appropriate number of filter banks m 1 , if m is small, take m 1 =m. Step F, sort and align the sampled echoes according to time, and the number of accumulated pu...

Embodiment 3

[0047] Such as image 3 As shown, select a target with a velocity of 400m / s, and perform 2048-order filtering on it. Step A, determine the minimum velocity v1 and maximum velocity v2 in the radial direction of the radar detection target; Step B, radar sampling rate fs, distance resolution Rmin is fs*c / 2, where c is the speed of light. Step C, the radar repetition period is T, the slowest target cross-distance unit needs t1=Rmin / v1, the fastest target cross-distance unit needs t2=Rmin / v2, n1=t1 / T, n2=t2 / T; in step D N 1 is the largest integer power of 2 not greater than n1, N m is the largest integer power not greater than n2. Step E, at N 1 and N m There are m integer powers of 2 between them (N 1 , N 2 ...N m ), considering N m It may be very large, and m is also very large. At this time, choose an appropriate number of filter banks m 1 , if m is small, take m 1 =m. Step F, sort and align the sampled echoes according to time, and the number of accumulated pulses i...

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Abstract

The invention discloses a Doppler measurement method for solving target migration through range cell. The method is a speed measurement algorithm of a full-phase circular array pulse Doppler radar, and the target speed in different speed ranges can be precisely measured, and the migration through range cell can be solved. The signal to noise ratio loss problem caused by the migration through rangecell of the targets in different speeds can be solved by simultaneously using multi-order MTD filters, and the precise measurement on the target speed is realized by crossly comparing the multi-orderMTD filters used as the same time; since the accumulation time of the different filter groups is different, the signal to noise ratio loss caused by the migration through range cell of the target canbe reduced; and for the condition that partial speed range can be free from the signal to noise ratio, the probability of detecting the small target can be improved. By using the filters with different orders, the speed measurement precision on the target can be improved by using the high-order filter.

Description

technical field [0001] The invention relates to a Doppler measurement method, in particular to a Doppler measurement method for solving the movement of a target unit across a distance, and belongs to the technical field of measurement applications. Background technique [0002] The speed of modern reconnaissance aircraft reaches several Machs, the speed of space debris is tens to hundreds of kilometers per second, and supersonic cruise missiles will also be available. Early warning and detection of these high-speed targets has become more and more important. The MTD method of pulse radar to realize the moving target detection is to realize the coherent accumulation in the Doppler domain for the same range unit in the sampling matrix formed by the echo sequence sampling, and detect the Doppler signal of the target echo. [0003] For the moving target detection of high-speed targets, due to the different echo pulses moving across distance units, the accumulated pulse number of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58
CPCG01S13/58
Inventor 孙大伟张雷徐雷
Owner CSIC WUHAN LINCOM ELECTRONICS
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