摘要
针对短基线相位干涉仪的测角问题,研究了信号源极化以及接收天线单元极化特性不一致性对测角精度的影响,建立了干涉仪对极化波的测角信号模型和测角误差模型,指出了非理想阵元在加工过程中极化特性难以保持一致,从而导致短基线相位干涉仪在低频端测量同一辐射源不同极化信号的到达角时会产生较大的误差,降低了系统的测角性能。从数学原理上阐明了工程中存在的物理现象和实际问题,进而证明了该误差无法用简单的校正固定幅相误差的方法来加以校正,提出了一种工程实用的修正方法。仿真结果证明了理论分析的正确性和算法的有效性,为校准系统误差提供了理论依据。
For the angle measurement problem of short-baseline phase interferometer, the effects of incoming wave polarization and inconsistency of array element polarization pattern on the angle measurement are studied. The angulation signals model and angulations error model are built. The polarization property of imperfect element can not keep consistence. It leads to angle measurement errors when receive different polarized signal from one radiation source in low frequency band. The system performances descent obviously. The physical phenomenon and practical problems in engineering are illuminated from mathematics principle. It is proved that this error can not be corrected by simple fixed amplitude-phase calibration method. An engineering practical calibration method is proposed. The simulation results proved its correctness and the effectiveness of theory analysis. It provids theory basement for system calibration.
出处
《电波科学学报》
EI
CSCD
北大核心
2010年第3期519-526,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金重点项目(60736006)
国家自然科学基金青年科学基金项目(60802078)
"十一五"总装备部武器装备预研项目(51309060305)
湖南省研究生科研创新项目
关键词
来波极化
干涉仪
阵元极化
测角
incoming wave polarization
phase interferometer
array element polarization
angle measure
