幅相误差对多发多收模式SAR成像影响分析
|
摘要
方位多通道SAR系统采用数字波束形成技术(Digital Beam-Forming,DBF),有效解决了高分辨率与大测绘带之间的矛盾,实现了高分辨率、宽测绘带对地观测,多发多收模式是方位多通道SAR未来的发展方向。建立了通道幅相特性误差和天线相位中心误差两类误差影响下的回波幅相误差模型,通过对方位向信号脉冲压缩的数学推导,求出了多发多收模式下回波信号的假目标位置和峰值-假目标比的解析表达式,从理论上分析了以上两类误差对该系统成像性能的影响。通过点目标成像仿真,验证了公式的正确性,得出了各类成像性能指标随各类误差变化的曲线。
Incorporated with digital beam-forming(DBF)techniques,the multi-channel spaceborne SAR system are able to overcome the contradiction between high resolution and wide swath and yield high resolution and wide swath(HRWS)images.The multiple transmit-receive mode is promising.In this paper,we build the echo model in which two kinds of channel errors,channel gain-phase error and antenna position error,are incorporated.By calculating the result of compression on the mismatched multi-channel azimuth signals,we get the analytical formulas of peek-to-ghost-ratio(PGR)under multiple transmit-receive mode.Then we can analyze the effects of these errors on imaging.Simulation validates the correctness of the formulas and also gives the curves which describe the relation of the imaging performance and these errors.
Incorporated with digital beam-forming(DBF)techniques,the multi-channel spaceborne SAR system are able to overcome the contradiction between high resolution and wide swath and yield high resolution and wide swath(HRWS)images.The multiple transmit-receive mode is promising.In this paper,we build the echo model in which two kinds of channel errors,channel gain-phase error and antenna position error,are incorporated.By calculating the result of compression on the mismatched multi-channel azimuth signals,we get the analytical formulas of peek-to-ghost-ratio(PGR)under multiple transmit-receive mode.Then we can analyze the effects of these errors on imaging.Simulation validates the correctness of the formulas and also gives the curves which describe the relation of the imaging performance and these errors.
引文
[1]杨桃丽.星载多通道高分辨宽测绘带合成孔径雷达成像处理技术研究[D].西安:西安电子科技大学,2014.
[2]BAUMGARTNER S V,KRIEGER G.Simultaneous High-Resolution Wide-Swath SAR Imaging and Ground Moving Target Indication:Processing Approaches and System Concepts[J].IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,2015,8(11):5015-5029.
[3]HONG F,WANG R,ZHANG Z,et al.Integrated Time and Phase Synchronization Strategy for a Multichannel Spaceborne-Stationary Bistatic SAR System[J].Remote Sensing,2016,8(8):628.
[4]郜参观,邓云凯,冯锦.通道不平衡对偏置相位中心多波束SAR性能影响的理论分析[J].电子与信息学报,2011,33(8):1828-1832.
[5]刘艳阳,李真芳,杨桃丽,等.一种单星方位多通道高分辨率宽测绘带SAR系统通道相位偏差时域估计新方法[J].电子与信息学报,2012,34(12):2913-2919.
[6]KIM H,CHANG Y K.Mission Scheduling Optimization of SAR Satellite Constellation for Minimizing System Response Time[J].Aerospace Science and Technology,2015,40(1):17-32.
[7]马仑,廖桂生,李真芳.多通道SAR误差估计与补偿方法及其实测数据验证[J].电子与信息学报,2009,31(6):1305-1309.
[8]ZHANG S,GUO Y,GOH C H,et al.A Novel Doppler Chirp Rate and Baseline Estimation Approach in Time Domain for Multi-Channel in Azimuth HRWS SAR System[C]∥IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar,Singapore:IEEE,2015:396-399.
[9]徐青.多通道雷达系统阵列误差校正方法研究[D].西安:西安电子科技大学,2011.
[10]LI Z,BAO Z,WANG H,et al.Performance Improvement for Constellation SAR Using Signal Processing Techniques[J].IEEE Trans on Aerospace and Electronic Systems,2006,42(2):436-452.
[11]宋岳鹏,杨汝良.应用多收发孔径实现高分辨率宽测绘带的合成孔径雷达研究[J].电子与信息学报,2007,29(9):2110-2113.
[12]马喜乐,孙造宇,董臻,等.方位多通道SAR信号重建性能分析[J].电子与信息学报,2014,36(3):545-551.
[2]BAUMGARTNER S V,KRIEGER G.Simultaneous High-Resolution Wide-Swath SAR Imaging and Ground Moving Target Indication:Processing Approaches and System Concepts[J].IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,2015,8(11):5015-5029.
[3]HONG F,WANG R,ZHANG Z,et al.Integrated Time and Phase Synchronization Strategy for a Multichannel Spaceborne-Stationary Bistatic SAR System[J].Remote Sensing,2016,8(8):628.
[4]郜参观,邓云凯,冯锦.通道不平衡对偏置相位中心多波束SAR性能影响的理论分析[J].电子与信息学报,2011,33(8):1828-1832.
[5]刘艳阳,李真芳,杨桃丽,等.一种单星方位多通道高分辨率宽测绘带SAR系统通道相位偏差时域估计新方法[J].电子与信息学报,2012,34(12):2913-2919.
[6]KIM H,CHANG Y K.Mission Scheduling Optimization of SAR Satellite Constellation for Minimizing System Response Time[J].Aerospace Science and Technology,2015,40(1):17-32.
[7]马仑,廖桂生,李真芳.多通道SAR误差估计与补偿方法及其实测数据验证[J].电子与信息学报,2009,31(6):1305-1309.
[8]ZHANG S,GUO Y,GOH C H,et al.A Novel Doppler Chirp Rate and Baseline Estimation Approach in Time Domain for Multi-Channel in Azimuth HRWS SAR System[C]∥IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar,Singapore:IEEE,2015:396-399.
[9]徐青.多通道雷达系统阵列误差校正方法研究[D].西安:西安电子科技大学,2011.
[10]LI Z,BAO Z,WANG H,et al.Performance Improvement for Constellation SAR Using Signal Processing Techniques[J].IEEE Trans on Aerospace and Electronic Systems,2006,42(2):436-452.
[11]宋岳鹏,杨汝良.应用多收发孔径实现高分辨率宽测绘带的合成孔径雷达研究[J].电子与信息学报,2007,29(9):2110-2113.
[12]马喜乐,孙造宇,董臻,等.方位多通道SAR信号重建性能分析[J].电子与信息学报,2014,36(3):545-551.