对GPS接收机多音干扰参数优化设置及效能分析

Parameters configuration and effectiveness analysis of multiple-tone jamming to GPS receiver

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-noiseratio,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-120dBW、-108dBW和-104dBW,低于匹配谱的-115dBW、-106dBW和-102dBW以及带限高斯噪声的-113dBW、-105dBW和-101dBW。

Based on modeling and advantage analysis of multiple-tone jamming,using jamming efficient carrier-to-noise ratio as the jamming effect evaluation index,according to the spectrum characteristic of global positioning 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 GPS 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 power 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.