信噪比强弱差异双信号的差值参数测量及精度分析

Differential Parameter Measurement and Its Precision Analysis for Two Signals with Different SNR

在电子侦察的测向与无源定位等应用中会涉及到相位差、时差、频差的测量,上述参数测量所能达到精度的分析一直是工程应用关注的重点。针对此问题,通过引入信号能量信噪比来反映测量过程中信号积累所产生的增益,然后解释了工程应用中双信号信噪比差异产生的各种原因,并从全新的视角重新推导了信噪比强弱差异双信号差值参数测量精度的计算过程,分析其特点,最后通过仿真验证了理论分析的有效性与正确性。从而为电子对抗侦察的测向与无源定位中差值参数的测量误差分析,以及此类系统的方案论证与设计优化提供了参考与指导。

In the application of direction finding(DF)and passive location in electronic reconnaissance,it involves the differential parameter measurement of two signals,such as phase difference,time difference,frequency difference,and so on.The measurement precision of above parameters is always a focus of engineering applications.Aiming at the problem,the signal accumulation gain in measurement is reflected through introducing the signal energy signal to noise ratio(SNR),then various reasons that SNR difference of two signals come into being are analyzed in engineering applications,and the calculation course of differential parameter measurement precision for two signals with strong and weak SNR is deduced from the new view,and its characteristics are summarized.In the end,this paper demonstrates the validity and correctness of theoretical analysis through simulation.It provides important reference and guidance for the measurement error analysis of differential parameter in DF and passive location for electronic countermeasure reconnaissance,as well as the project demonstration and designation optimization of this kind of system.