基于熵準(zhǔn)則的勻速直線運(yùn)動(dòng)目標(biāo)的轉(zhuǎn)動(dòng)補(bǔ)償
ROTATIONAL MOTION COMPENSATION OF THE TARGET MOVING UNIFORMLY
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摘要: 在ISAR成像中,當(dāng)完成了運(yùn)動(dòng)目標(biāo)的平動(dòng)補(bǔ)償后,還需進(jìn)行轉(zhuǎn)動(dòng)補(bǔ)償。本文就目標(biāo)作勻速直線運(yùn)動(dòng)時(shí)相對(duì)雷達(dá)的轉(zhuǎn)角變化進(jìn)行了分析,得出在小轉(zhuǎn)角條件下,該類運(yùn)動(dòng)的轉(zhuǎn)角變化規(guī)律主要取決于非線性度因子,本文提出采用最小熵準(zhǔn)則對(duì)進(jìn)行最優(yōu)估計(jì)和補(bǔ)償。仿真和實(shí)測數(shù)據(jù)的計(jì)算結(jié)果表明了理論分析的正確性和補(bǔ)償方法的可行性。
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關(guān)鍵詞:
- ISAR; 轉(zhuǎn)動(dòng)補(bǔ)償; 非線性度因子
Abstract: After translational motion compensation, rotational motion compensation is needed in ISAR technique. This paper considers the rotational motion compensation in the case of that the target moves along a straight trajectory with constant speed. It is found out that the nonlinear factor is most important parameter in its rotational motion compensation. In order to estimate , image entropy minimization principle is described here. Based on this principle, the unknown can be estimated accurately. The effecttiveness of this method are shown by simulated and experimental results. -
Ausherman D A, et al. Developments in radar imaging[J].IEEE Trans. on Aerospace and Electronic System.1984, AES-20(4):363-400[2]Wehner D. High Resolution Radar. Norwood, MA: Artech House, 1995, Chapter 7.［3］Chen C C, Andrews H C. Target-motion-induced radar imaging. IEEE Trans. on Aerospace and Electronic System, 1980, AES-16(1): 2-14.[3]邱曉暉.運(yùn)動(dòng)目標(biāo)雷達(dá)成像研究:[博士學(xué)位論文].南京:南京航空航天大學(xué),1995.12.[4]Jain A, Patel I. SAR/ISAR imaging of a non-uniformly rotating target. IEEE Trans. on Aerospace and Electronic System, 1992, AES-28(1): 317-321.[5]Werness S, et al. Moving target imaging algorithm for SAR data. IEEE Trans. on Aerospace and Electronic System, 1990, AES-26(1): 57-67. -
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