双基前视雷达二维空变补偿频域成像方法

doi:10.12305/j.issn.1001-506X.2023.07.09

Abstract

Abstract:

To solve the problem of the strong 2D spatial-variant of echo Doppler parameters in the airborne bistatic forward-looking radar under the condition of wide-swath and long synthetic aperture time, a 2D spatial-variant order compensation imaging method is proposed. Based on the best uniform approximation characteristics of Chebyshev orthogonal polynomials, the high-precision approximation of slant-distance and the high-quality decoupling of 2D spectrum is realized, then the spatial-variant linear range cell migration(LRCM) is corrected by Keystone transform. On this basis, the 2D spatial-variant order of Doppler parameters is quantitatively analyzed. Taking π/4 phase threshold as the standard, the 2D spatial-variant correction function suitable for the spatial-variant order is designed by using the least square fitting algorithm, and the azimuth extended nonlinear chirp scaling accuracy imaging method is proposed to accurately and efficiently correct the Doppler parameters of different spatial-variant order. The results of point target simulation and real data processing verify the good focusing performance of the proposed method.

Key words: synthetic aperture radar (SAR), range wide-swath, long synthetic aperture time, 2D spatial-variant, bistatic forward-looking imaging

CLC Number:

TN957

Pengfei WANG, Hengyi ZHAN, Hongzhong SUN. Two-dimensional spatial-variant compensation frequency domain imaging method for bistatic forward-looking radar[J]. Systems Engineering and Electronics, 2023, 45(7): 1990-2001.

Figures/Tables 18

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References 24

1	党彦锋, 梁毅, 张罡, 等. 机动平台俯冲大斜视SAR脉冲重复频率设计[J]. 系统工程与电子技术, 2020, 42 (3): 575- 581.
	DANG Y F , LIANG Y , ZHANG G , et al. Pulse repetition frequency design for diving highly squinted synthetic aperture radar mounted on maneuvering platform[J]. Systems Engineering and Electronics, 2020, 42 (3): 575- 581.
2	孟自强, 李亚超, 胡奇, 等. 弹载双基前视SAR建模及运动/同步误差分析[J]. 系统工程与电子技术, 2015, 37 (3): 523- 531.
	MENG Z Q , LI Y C , HU Q , et al. Modeling and motion/synchronization error analysis if MBFL-SAR[J]. Systems Engineering and Electronics, 2015, 37 (3): 523- 531.
3	梅海文, 李亚超, 邢孟道, 等. 机-弹双基前视SAR俯冲段轨迹设计方法[J]. 系统工程与电子技术, 2019, 41 (4): 752- 758.
	MEI H W , LI Y C , XING M D , et al. Trajectory design method for the terminal diving period of AMBFL-SAR[J]. Systems Engineering and Electronics, 2019, 41 (4): 752- 758.
4	ZHANG Q H , WU J J , SONG Y , et al. Bistatic range Doppler aperture wave number algorithm for forward-looking spotlight SAR with stationary transmitter and maneuvering receiver[J]. IEEE Trans.on Geoscience and Remote Sensing, 2021, 59 (3): 2080- 2094. doi: 10.1109/TGRS.2020.3004726
5	WU J J , PU W , HUANG Y L , et al. Bistatic forward-looking SAR focusing using based on spectrum modeling and optimization[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2018, 11 (11): 4500- 4512. doi: 10.1109/JSTARS.2018.2873645
6	LIANG W , SU W M , GU H . Focusing high-resolution high forward-looking bistatic SAR with nonequal platform velocities based on Keystone transform and modified nonlinear Chirp scaling algorithm[J]. IEEE Sensors Journal, 2019, 19 (3): 901- 908. doi: 10.1109/JSEN.2018.2877387
7	SHIN H , LIM J . Omega-k algorithm for airborne forward-look-ing bistatic spotlight SAR imaging[J]. IEEE Trans.on Geoscience and Remote Sensing Letters, 2009, 6 (2): 312- 316. doi: 10.1109/LGRS.2008.2011924
8	DAI C Y , ZHANG X L . Omega-k algorithm for bistatic SAR with arbitrary geometry configuration[J]. Journal of Electromagnetic Waves and Applications, 2011, 25 (11-12): 1564- 1576. doi: 10.1163/156939311797164972
9	DENG H , LI Y C , LIU M Q , et al. A space-variant phase filtering imaging algorithm for missile-borne biSAR with arbitrary configuration and curved track[J]. IEEE Sensors Journal, 2018, 18 (8): 3311- 3326. doi: 10.1109/JSEN.2018.2809508
10	WU J J , LI Z Y , HUANG Y L , et al. Focusing bistatic forward-looking SAR with stationary transmitter based on Keystone transform and nonlinear chirp scaling[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 11 (1): 148- 152. doi: 10.1109/LGRS.2013.2250904
11	ZHANG H , TANG J W , WANG R . An accelerated back-projection algorithm for monostatic and bistatic SAR processing[J]. Remote Sensing, 2018, 10 (1): 140- 159. doi: 10.3390/rs10010140
12	LUO Y , ZHAO F J , LI N , et al. An autofocus cartesian factorized back projection algorithm for spotlight synthetic aperture radar imaging[J]. IEEE Geoscience Remote Sensing Letters, 2018, 15 (8): 1244- 1248. doi: 10.1109/LGRS.2018.2829483
13	DONG Q , SUN G C , YANG Z , et al. Cartesian factorized back projection algorithm for high-resolution spotlight SAR imaging[J]. IEEE Sensors Journal, 2018, 18 (3): 1160- 1168. doi: 10.1109/JSEN.2017.2780164
14	NEO Y , WONG F H , CUMINMING I G . Processing of azimuth-invariant bistatic SAR data using the range doppler algorithm[J]. IEEE Trans.on Geoscience and Remote Sensing, 2008, 46 (1): 14- 21. doi: 10.1109/TGRS.2007.909090
15	WONG F W , YEO T S . New application of non-linear chirp scaling in SAR data processing[J]. IEEE Trans.on Geoscience and Remote Sensing, 2001, 39 (5): 946- 953. doi: 10.1109/36.921412
16	LIU G G , ZHANG L R , LIU X . General bistatic SAR data processing based on extended nonlinear chirp scaling[J]. IEEE Sensors Letters, 2013, 10 (5): 976- 980.
17	LI Y C , ZHANG T H , MEI H W , et al. Focusing translational- variant bistatic forward-looking SAR data using the modified omega-k algorithm[J]. IEEE Trans.on Geoscience and Remote Sensing, 2021, 60, 5203916.
18	李梦慧, 谭鸽伟, 杨晶晶, 等. 基于运动补偿和正交解耦合的双基SAR成像算法[J]. 信号处理, 2021, 37 (1): 75- 85.
	LI M H , TAN G W , YANG J J , et al. An imaging algorithm for bistatic SAR based on the motion compensation and orthogonal decoupling[J]. Journal of Signal Processing, 2021, 37 (1): 75- 85.
19	MEI H W , MENG Z Q , LIU M Q , et al. Thorough understanding property for bistatic forward-looking high-speed maneuvering platform SAR[J]. IEEE Trans.on Geoscience and Remote Sensing, 2017, 53 (4): 1826- 1845.
20	MEI H W , LI Y C , XING M D , et al. A frequency-domain imaging algorithm for translational variant Bistatic forward-looking SAR[J]. IEEE Trans.on Geoscience and Remote Sensing, 2020, 58 (3): 1502- 1515.
21	WU J J , SUN Z C , LI Z Y , et al. Focusing translational variant bistatic forward-looking SAR using keystone transform and extended nonlinear chirp scaling[J]. Remote Sensing, 2016, 8 (10): 840.
22	CLEMENTE C , SORAGHAN J J . Approximation of the bistatic slant range using Chebyshev polynomials[J]. IEEE Geoscience and Remote Sensing Letters, 2012, 9 (4): 682- 686.
23	RAN L , XIE R , LIU Z , et al. Simultaneous range and cross- range variant phase error estimation and compensation for highly squinted SAR imaging[J]. IEEE Trans.on Geoscience and Remote Sensing, 2018, 56 (8): 4448- 4463.
24	王娟, 赵永波. Keystone变换实现方法研究[J]. 火控雷达技术, 2011, 40 (1): 45- 51.
	WANG J , ZHAO Y B . Research on implementation of Keystone transform[J]. Fire Control Radar Technology, 2011, 40 (1): 45- 51.

类型	名称	值
雷达系统参数	脉宽/μs	2
	带宽/MHz	180
	载频/GHz	11
	PRF/Hz	2 000
	采样频率/MHz	350
雷达运动参数	合成孔径时间/s	4
	场景中心点/m	(0, 0, 0)
	接收雷达起始坐标/m	(0, -11 000, 6 000)
	发射雷达起始坐标/m	(-11 000, -400, 5 000)
	接收雷达速度/(m/s)	(0, 280, -40)
	发射雷达速度/(m/s)	(-83, 100, -40)
	接收雷达加速度/(m/s²)	(0, -5, 2)
	发射雷达加速度/(m/s²)	(1, -4, 1)

成像方法	点目标	距离向		方位向
成像方法	点目标	峰值旁瓣比	积分旁瓣比	峰值旁瓣比	积分旁瓣比
文献[18]	P₁	-13.04	-10.06	-11.72	-7.16
	P₂	-13.26	-10.03	-13.23	-9.59
	P₃	-13.01	-10.32	-8.72	-5.58
本文	P₁	-13.26	-11.19	-13.18	-9.75
	P₂	-13.26	-11.19	-13.26	-9.76
	P₃	-13.26	-11.19	-13.19	-9.79

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Two-dimensional spatial-variant compensation frequency domain imaging method for bistatic forward-looking radar

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