高动态低信噪比CPFSK信号快速检测方法

A Fast Detection Algorithm for CPFSK Signal in High Dynamic and Low SNR Environment

针对高动态、低信噪比环境下连续相位频移键控(CPFSK)信号难以快速检测问题,提出了一种可快速检测CPFSK信号的多符号检测方法。在信号采样状态对采样数据进行乒乓读写控制,实现接收信号的准实时快速检测;在数据处理状态根据调频码元速率和调频指数对采样数据进行正、负频率预补偿,削弱调频频率的频谱影响;对积分数据加矩形窗进行频谱平滑,采用积分峰值与自适应检测门限进行判决解算,提高CPFSK信号的检测概率和测频精度。试验与分析表明:该方法在高动态、低信噪比环境下可明显提高CPFSK信号的检测性能。

Aiming at the difficult problem that fast detection of continuous phase frequency shift keying(CPFSK) signal in high dynamic and low signal-to-noise ratio(SNR) environment is hard to realized, a multiple symbol detection algorithm for CPFSK signal is proposed. To quasi real-time detection of the received signal, sampling status writes and reads the sampling data in the method of ping-pong. To reduce the spectrum effect of frequency modulation(FM) frequency, processing status pre-compensate the sampling data with a positive and negative frequency according to FM symbol rate and FM index. To improve the detection probability and measurement accuracy of CPFSK signal, a rectangular window is added to the integral data for smoothing the frequency spectrum, the integral peak value and adaptive detection threshold are distinguished and calculated. The results indicate that the algorithm can effectively improve the estimation performance of CPFSK signal in high dynamic and low SNR environment.