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Since the Doppler parameters vary according to the slant distance, the resolution is lower when using an imaging algorithm of traditional pulse compression in processing raw echo data of the missile-borne synthetic aperture radar (SAR). Moreover, an algorithm is proposed to solve these problems, which is based on the fractional Fourier transform (FrFT) for missile-borne SAR imaging. Firstly, an echo signal model is built for the terminal guidance stage of the missile-borne SAR. Secondly, the chirp rate of the echo signal is measured through the local optimum processing and obtains the optimum angles for the FrFT, and then the entire SAR image can be obtained by using FrFT with the optimum azimuth angles and operating range. Finally, the performances of the algorithms are assessed using simulated and real Radarsat-1 data sets. Results confirm that the FrFT-based missile-borne SAR processing methods can provide enhanced resolution that yields both lower-side lobes effects and improved target detection. The method introduced in this paper has important theoretical significance in detection and recognition of military targets and for precision guidance.
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Keywords:
- synthetic aperture radar /
- missile-borne /
- chirp /
- fractional Fourier transform
[1] Ji W J, Tong C M 2012 Acta Phys. Sin. 61 160301 (in Chinese)[姬伟杰, 童创明 2012 物理学报 61 160301]
[2] Liu G G, Zhang L R, Liu N, Chen G F, Zhang Y 2013 IEEE Geosci Remote S. 10 342
[3] Ji W J, Tong C M 2013 Chin. Phys. B 22 020301
[4] Wu Y G, Tao M D 2006 Chin. Phys. B 15 1137
[5] Yan Y, Zhou Y Q, Li C S, Xu L X 2002 J. Electron. Inf. Tech. 24 1932 (in Chinese) [燕英, 周荫清, 李春升, 许丽香 2002 电子与信息学报 24 1932]
[6] Yu G M, Deng H T, Zhang C Y, Wu S J 2006 J. Syst. Eng. Electron. 28 997 (in Chinese) [俞根苗, 邓海涛, 张长耀, 吴顺君 2006 系统工程与电子技术 28 997]
[7] Fang L L, Wang Y F 2008 J. Electron. Inf. Tech. 30 1316 (in Chinese) [房丽丽, 王岩飞 2008 电子与信息学报 30 1316]
[8] Zhou P, Xiong T, Zhou S, Li Y C, Xing M D 2011 J. Electron. Inf. Tech. 33 622 (in Chinese) [周鹏, 熊涛, 周松, 李亚超, 邢孟道 2011 电子与信息学报 33 622]
[9] Zhou S, Bao M, Zhou P, Xing M D, Bao Z 2011 J. Electron. Inf. Tech. 33 1420 (in Chinese) [周松, 包敏, 周鹏, 邢孟道, 保铮 2011 电子与信息学报 33 1420]
[10] Almeida L B 1994 IEEE Trans. Signal Proc. 42 3084
[11] Ozaktas H M, O Arikan, Kutay M A, Bozdagt G 1996 IEEE Trans. Signal Proc. 44 2141
[12] Shinde S, Gadre V 2001 IEEE Trans. Signal Proc. 49 2545
[13] Amein A S, Soraghan J J 2005 IEEE Trans. Signal Proc Let. 12 705
[14] Amein A S, Soraghan J J 2007 IEEE Trans. Signal Proc. 55 4162
[15] Clemente C, Soraghan J J 2012 IET Signal Processing. 6 503
[16] Deng B, Li X, Wang H Q, Qin Y L, Wang J T 2011 IEEE Geosci. Remote S. 8 44
[17] Chen S, Zhao H C, Zhang S N Chen Y 2013 Acta Phys. Sin. 62 218405 (in Chinese) [陈思, 赵惠昌, 张淑宁, 陈勇 2013 物理学报 62 218405]
[18] Tao R, Deng B, Wang Y 2009 Fractional Fourier Transform (Beijing: Tsinghua University Press) p25 (in Chinese) [陶然, 邓兵, 王越, 2009 分数阶傅里叶变换及其应用(北京:清华大学出版社)第25 页]
[19] Capus C, Brown K 2003 J. Acoust. Soc. Am. 113 3253
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[1] Ji W J, Tong C M 2012 Acta Phys. Sin. 61 160301 (in Chinese)[姬伟杰, 童创明 2012 物理学报 61 160301]
[2] Liu G G, Zhang L R, Liu N, Chen G F, Zhang Y 2013 IEEE Geosci Remote S. 10 342
[3] Ji W J, Tong C M 2013 Chin. Phys. B 22 020301
[4] Wu Y G, Tao M D 2006 Chin. Phys. B 15 1137
[5] Yan Y, Zhou Y Q, Li C S, Xu L X 2002 J. Electron. Inf. Tech. 24 1932 (in Chinese) [燕英, 周荫清, 李春升, 许丽香 2002 电子与信息学报 24 1932]
[6] Yu G M, Deng H T, Zhang C Y, Wu S J 2006 J. Syst. Eng. Electron. 28 997 (in Chinese) [俞根苗, 邓海涛, 张长耀, 吴顺君 2006 系统工程与电子技术 28 997]
[7] Fang L L, Wang Y F 2008 J. Electron. Inf. Tech. 30 1316 (in Chinese) [房丽丽, 王岩飞 2008 电子与信息学报 30 1316]
[8] Zhou P, Xiong T, Zhou S, Li Y C, Xing M D 2011 J. Electron. Inf. Tech. 33 622 (in Chinese) [周鹏, 熊涛, 周松, 李亚超, 邢孟道 2011 电子与信息学报 33 622]
[9] Zhou S, Bao M, Zhou P, Xing M D, Bao Z 2011 J. Electron. Inf. Tech. 33 1420 (in Chinese) [周松, 包敏, 周鹏, 邢孟道, 保铮 2011 电子与信息学报 33 1420]
[10] Almeida L B 1994 IEEE Trans. Signal Proc. 42 3084
[11] Ozaktas H M, O Arikan, Kutay M A, Bozdagt G 1996 IEEE Trans. Signal Proc. 44 2141
[12] Shinde S, Gadre V 2001 IEEE Trans. Signal Proc. 49 2545
[13] Amein A S, Soraghan J J 2005 IEEE Trans. Signal Proc Let. 12 705
[14] Amein A S, Soraghan J J 2007 IEEE Trans. Signal Proc. 55 4162
[15] Clemente C, Soraghan J J 2012 IET Signal Processing. 6 503
[16] Deng B, Li X, Wang H Q, Qin Y L, Wang J T 2011 IEEE Geosci. Remote S. 8 44
[17] Chen S, Zhao H C, Zhang S N Chen Y 2013 Acta Phys. Sin. 62 218405 (in Chinese) [陈思, 赵惠昌, 张淑宁, 陈勇 2013 物理学报 62 218405]
[18] Tao R, Deng B, Wang Y 2009 Fractional Fourier Transform (Beijing: Tsinghua University Press) p25 (in Chinese) [陶然, 邓兵, 王越, 2009 分数阶傅里叶变换及其应用(北京:清华大学出版社)第25 页]
[19] Capus C, Brown K 2003 J. Acoust. Soc. Am. 113 3253
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