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[1]高玉祥,张兴敢*,柏业超.基于Keystone变换的高速运动目标检测方法研究[J].南京大学学报(自然科学),2014,50(1):30.[doi:DOI:10.13232/j.cnki.jnju.2014.01.005]
 Gao Yuxiang,Zhang Xinggan,Bai Yechao.Research on high-velocity targets detection based on Keystone transform[J].Journal of Nanjing University(Natural Sciences),2014,50(1):30.[doi:DOI:10.13232/j.cnki.jnju.2014.01.005]
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基于Keystone变换的高速运动目标检测方法研究()
     

《南京大学学报(自然科学)》[ISSN:0469-5097/CN:32-1169/N]

卷:
50
期数:
2014年第1期
页码:
30
栏目:
出版日期:
2014-01-31

文章信息/Info

Title:
Research on high-velocity targets detection based on Keystone transform
作者:
高玉祥张兴敢*柏业超
(南京大学电子科学与工程学院,南京,210046)
Author(s):
Gao Yuxiang Zhang Xinggan Bai Yechao
(School of Electronic Science and Engineering, NanJing University, NanJing210046)
关键词:
越距离单元走动Keystone变换多普勒模糊相参积累
Keywords:
range resolution cell keystone transform doppler ambiguity pulses accumulate
分类号:
-
DOI:
DOI:10.13232/j.cnki.jnju.2014.01.005
文献标志码:
-
摘要:
高速运动目标脉间存在越距离单元走动,且多普勒频谱混叠,脉间相参积累困难。利用长时间的信号积累,来提高微弱高速运动目标在低信噪比下的检测性能理论上是一种有效方法,但积累时间长,使得目标回波越距离单元走动,相参积累更加困难。进行速度提前预估计的方法,能很好提高检测性能,但增加了技术难度,并且需要长的检测时间。本文研究一种改进的Keystone变换方法,该方法是通过计算不同模糊系数时的所有回波脉冲峰值位置的方差,记录下方差最小时的模糊系数,利用该模糊系数,结合运用SINC函数插值实现的变换方法。该变换方法不受目标回波积累时间的限制,无需预先估计目标速度,可同时实现解多普勒模糊和补偿距离走动。仿真结果表明,与进行匹配滤波后相参积累的方法相比,结合最小方差法和Keystone变换的方法,能有效补偿距离走动,去除多普勒模糊,有效提高了高速运动目标回波脉冲积累的信噪比,改善了雷达的检测性能。
Abstract:
The target echo migration usually exceeds a range resolution cell, when the target is moving with a high velocity. Thiscauses Doppler frequencyspectrum aliasing, and makes it troublesome to accumulate the pulses.Theorily, when the high-velocity target’s signal is at low signal to noise ratio(SNR), accumulating for longer timecould develop the detection ability. However, during longer term accumulation, the waves of pulses may exceed several range resolution cells. This makes it much more difficult to pulses accumulation. Estimating speed before detection could develop detection abilityintheory.But in fact, it’s very difficult to measure the speed. Even realized, it needs much longer term to archive. This is very difficult to come true in practice.In this paper,theoretical derivationwill be carried onparticularly. Ittells why there would be rangemigrationand Doppler ambiguity, and how to compensate them. Based on the theoretical derivation,a modifiedmethodwhich is based on Keystone transform is put forward.The method is calculating the differences of all the points of pulses’peaks,which is get at different ambiguity factor.Note the Doppler ambiguity factor when the difference is smallest.This Doppler ambiguity factor can be used to compensate Doppler ambiguity as is shown below.Keystone transform can be realized by the method of SINC interpolation and the method of calculating Doppler ambiguity factor. This method is not restricted by the accumulation time, and doesn’t need to estimate the speed before detection.What’s more, this method couldcompensate the range migration and Doppler ambiguitywithout acknowledging the target’s speed.The resultshowsthat, compared with other methods,this method could compensate the range migration and Doppler ambiguity without acknowledging the targets’ speeds.It is not restricted by the detectiontime. It also develops the SNR of the pulses of high-velocitytargets, and Radars’ detection ability in wideband radar. This method is of great value in practice, especially in millimeterwaveradar

参考文献/References:

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备注/Memo

备注/Memo:
苏省产学研联合创新资金———前瞻性联合研究项目(BY2012187)
更新日期/Last Update: 2014-01-15