基于时频投影的跳频信号分选研究

Study on selection of frequency hopping signal based on time-frequency projection

提出一种基于时频投影的跳频信号分选算法。从频域投影信号分选出潜在跳频信号频率集合。根据跳频信号瞬时带宽,将潜在跳频频率点邻域时频图投影到时域,分选潜在频率跳变点集合。根据从驻留期和过渡期直方图中提取的驻留期与过渡期参数集合,剔出定频信号,实现不同跳频网台信号分选。仿真给出了该算法的理论网台分选性能。实验测试结果表明,该算法能在处理延迟为一个跳周期条件下实时解跳出信噪比为SNR≥?5dB跳频信号的基带IQ。

A Frequency-hopping selection algorithm based on time-frequency image projection method is proposed in this paper. The potential frequency set is fetched from the frequency axis projection signal. The potential temporal hopping point set is fetched from the temporal projection variance of the adjacent domain time-frequency image according to the instantaneous signal bandwidth. With the duration and transition parameter sets obtained from the correspondence histograms, the fix frequency signal is eliminated and the different frequency hopping signals are selected out. The theory selection performance is given out by simulation. The real-time experiment system shows that this algorithm can achieve the In-phase and Quadrature baseband signals with SNR≥-5dB frequency hopping signal under one hop duration delay.