GPS军码信号的带限高斯噪声干扰参数选择分析  

Analysis of Jamming Parameters Selecting of Band-limited Gaussian Noise to GPS Military Signals

作　　者：毛虎[1] 吴德伟[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《空军工程大学学报（自然科学版）》2014年第6期58-62,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61174194)

摘　　要：为了提高带限高斯噪声对GPS军码信号的干扰效率,以GPS接收机的码跟踪误差作为干扰效果评估指标,对其特定干信比下的干扰频偏和干扰带宽进行优化确定。在分析GPS P（Y）码和M码信号功率谱特点的基础上,根据非相干超前减滞后处理码跟踪环路工作原理,理论推导得到干扰频偏和干扰带宽与码跟踪误差的解析式。基于实际情况设置接收机码环参数,分别定量地仿真计算出不同干信比下针对P（Y）码和M码信号的高效干扰频偏和干扰带宽。以造成码环失锁所需干信比最小为主要评判准则,同时考虑干扰易实施性和频域滤波等因素的影响,通过综合比较得出：当干信比在50～60dB范围内时,针对P（Y）码信号的干扰频偏和干扰带宽分别设置为0和8.8MHz,针对正弦BOC和余弦BOC调制的M码信号的干扰频偏分别设置为9.833 MHz和10.9 MHz,干扰带宽统一设置为10 MHz。For the sake of improving jamming efficiency of band-limited Gaussian noise to GPS military signals,this paper use code tracking error of GPS receiver as the jamming effect evaluation index to optimize band-limited Gaussian noise jamming frequency offset and bandwidth under given JSR.On the basis of analysis GPS P（Y）code and M code signal power spectrum characteristics,according to operating principle of non-coherent early-minus-late power DLL,the expression between jamming frequency offset and bandwidth with code tracking error is obtained through theoretical derivation.Based on practical condition to set the DLL parameters of receiver,the efficient band-limited Gaussian noise jamming frequency offset and bandwidth to P（Y）code and M code signal is simulated and calculated quantitatively under the different JSR respectively.Taking the minimum JSR of causing DLL lock-lose as primary opting criterion,at the same time to consider the influence of jamming implement complexity and frequency domain filtering,the conclusion of comprehensive compare show that when the JSR within 50～60dB,the jamming frequency offset and bandwidth to P（Y）code is set to 0and 8.8 MHz respectively,the jamming frequency offset toM code of BOCsin and BOCcos modulation is set to 9.833 MHz and 10.9MHz respectively,the jamming bandwidth is set to uniform 10 MHz.

关 键 词：P(Y)码和M码 码跟踪误差 干扰频偏 干扰带宽 干信比 

分 类 号：TN96[电子电信—信号与信息处理] TN97[电子电信—信息与通信工程]