论文部分内容阅读
GPS系统工作在有干扰的环境中时,近处干扰与远处卫星间巨大的功率差异导致GPS信号的扩频增益不足以抵抗干扰的影响.空时自适应处理技术已成为GPS接收机抗干扰研究的热点,相比于空域自适应阵列处理可以有更多的抗干扰自由度,消除多个强的宽带干扰及近场的宽带干扰多径.但是由于空时自适应处理的结构使之在处理带宽上不能有一致的频率响应,造成GPS信号的相关函数的相关峰产生畸变,降低接收机的定位精度.本文分析了空域与空时域自适应阵列处理抵抗干扰的性能,对空时自适应处理的原理及影响卫星信号的原因进行了研究,为了恢复出期望的卫星信号,提出一种基于同态滤波均衡原理的方法,补偿由空时自适应处理造成的对卫星信号的影响.仿真结果表明了所提出的方法的有效性.
When the GPS system works in an interference environment, the huge power difference between near and far satellites causes the spread spectrum gain of the GPS signal to be insufficient to resist the influence of interference. The space-time adaptive processing technology has become a GPS receiver anti-interference Compared with airspace adaptive array processing, the research hotspot can have more anti-jamming degrees of freedom and eliminate multiple strong broadband interference and near-field wideband interference multipath. However, due to the structure of space-time adaptive processing, Processing bandwidth can not have a consistent frequency response, resulting in correlation of GPS signal correlation peak distortions, reducing the receiver’s positioning accuracy.This paper analyzes the performance of space-time and space-time adaptive array processing to resist interference, Adaptive processing principles and the reasons that affect the satellite signals are studied. In order to recover the desired satellite signals, a method based on the homomorphic filter equalization principle is proposed to compensate for satellite signals caused by space-time adaptive processing. The results show the effectiveness of the proposed method.