Analysis and Experimental Verification of Sensitivity and SNR of Laser Warning Receiver
ZHANG Ji-long, WANG Ming, TIAN Er-ming, LI Xiao, WANG Zhi-bin, ZHANG Yue
Key Laboratory of Instrumentation & Dynamic Measurement, Ministry of Education, North University of China, Engineering Technology Research Center of Shanxi Province for Optoelectronic Information and Instrument，Taiyuan 030051, China
Abstract：In order to countermeasure increasingly serious threat from hostile laser in modern war, it is urgent to do research on laser warning technology and system, and the sensitivity and signal to noise ratio (SNR) are two important performance parameters in laser warning system. In the present paper, based on the signal statistical detection theory, a method for calculation of the sensitivity and SNR in coherent detection laser warning receiver (LWR) has been proposed. Firstly, the probabilities of the laser signal and receiver noise were analyzed. Secondly, based on the threshold detection theory and Neyman-Pearson criteria, the signal current equation was established by introducing detection probability factor and false alarm rate factor, then, the mathematical expressions of sensitivity and SNR were deduced. Finally, by using method, the sensitivity and SNR of the sinusoidal grating laser warning receiver developed by our group were analyzed, and the theoretic calculation and experimental results indicate that the SNR analysis method is feasible, and can be used in performance analysis of LWR.
Key words：Laser warning technology;Spectral discrimination;Sensitivity;Signal-noise-ratio (SNR);Signal current equation;Threshold theory;Neyman-Pearson criteria
张记龙,王明,田二明,李晓,王志斌,张悦. 激光告警接收机灵敏度和信噪比分析及实验验证[J]. 光谱学与光谱分析, 2009, 29(01): 20-23.
ZHANG Ji-long, WANG Ming, TIAN Er-ming, LI Xiao, WANG Zhi-bin, ZHANG Yue. Analysis and Experimental Verification of Sensitivity and SNR of Laser Warning Receiver. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(01): 20-23.
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