对GPS接收机多音干扰参数优化设置及效能分析

摘要

在对多音干扰信号建模及优势分析的基础上,以干扰等效载噪比(carrier‐to‐noise ratio ,CNR)作为干扰效果评估指标,根据全球定位系统C/A码、P(Y )码和 M 码信号频谱特点,推导分析得到对3种伪码信号的多音干扰音调位置设置方法.考虑频域滤波影响,仿真分析得出对3种伪码信号的多音干扰音调数量统一确定原则.仿真结果表明,同等干信比下,参数优化设置后的多音干扰效能要优于匹配谱和带限高斯噪声,其造成3种伪码信号载波锁相环失锁所需最小干扰功率分别为 －120 dBW 、－108 dBW和－104 dBW ,低于匹配谱的－115 dBW 、－106 dBW和 －102 dBW以及带限高斯噪声的－113 dBW 、－105 dBW和 －101 dBW .%Based on modeling and advantage analysis of multiple‐tone jamming ,using jamming efficient car‐rier‐to‐noise ratio as the jamming effect evaluation index ,according to the spectrum characteristic of global posi‐tioning system C/A code , P (Y ) code and M code signals , a multiple‐tone jamming frequency offset setting method to three kinds of GPS spread spectrum code signals is derived .Considering the influence of frequency domain filtering ,the uniform determination principles of the multiple‐tone jamming multiple‐tone number to three kinds of G PS spread spectrum code signals are acquired .The simulation results show that the effectiveness of optimized multiple‐tone jamming is greater than the matching spectrum and band‐limited Gaussian noise jamming under the same jamming‐to‐signal ratio condition ,requiring minimum jamming pow er for causing three kinds of GPS spread spectrum code signal phase locked loop lock‐lose is respectively －120 dBW ,－108 dBW and －104 dBW ,lower than －115 dBW ,－106 dBW and －102 dBW of the matching spectrum as well as －113 dBW ,－105 dBW and －101 dBW of the band‐limited Gaussian noise .