串行干扰消除法捕获性能分析  

Capture Performance Analysis of Successive Interference Cancellation

作　　者：刘亚欢[1] 田宇[1] 李国通[1] 

机构地区：[1]中国科学院微小卫星联合重点实验室,上海200050

出　　处：《计算机仿真》2010年第9期52-56,共5页Computer Simulation

摘　　要：针对卫星的GPS系统抗互相干扰的问题,GPS弱信号检测变得越来越重要。在存在强信号的情况下,互相干干扰是GPS弱信号检测的一个最主要问题。通过检测可消除干扰,采用串行干扰消除法(Successive Interference Cancellation)通过参数估计恢复出强信号,然后从接收信号中减去恢复出的强信号,再对相减之后的信号进行弱信号的捕获跟踪。仿真表明在一般情况下,其抗互相干的能力为20dB。结果说明串行干扰消除法能够有效消除强信号的互相干干扰,解决在强信号环境下GPS弱信号的检测性能问题。Detection of weak GPS signals is becoming important in many applications of GPS. Cross correlation jamming represents a significant problem in the detection of weak GPS signals with the presence of strong GPS signal. Successive Interference Cancellation estimates the parameters of strong signal and regenerate strong signal then captures the signal which minus the regenerated strong signal from the received signal. Simulation shows that the Anti-Cross-Correlation performance of Capture is 20dB. Results show that Successive Interference Cancellation eliminates cross correlation jamming efficiently and solve the problem of detecting weak GPS signal with presence of strong GPS signal.

关 键 词：全球定位系统 串行干扰消除 互相关 捕获 

分 类 号：TN911.8[电子电信—通信与信息系统]