跳频信号的跳周期估计

Hop duration estimation for frequency-hopping signals

摘要:

针对通信对抗的实际应用，提出了一种精确估计跳频信号跳周期的新方法。首先对跳频信号进行短时傅里叶变换(STFT)，根据STFT的结果得到其峰值序列，然后对峰值序列进行单比特采样，从最终的单比特采样序列可以获得跳频信号跳频周期的估计。此算法简单，易于实现且计算量小，在信噪比大于-1 dB时，仿真结果验证了该算法的有效性。

Abstract:

Aiming at the actual application of communication countermeasure, a new method about accurately estimating the hop duration was proposed for the Frequency-Hopping(FH) signals. It applied Short Time Fourier Transform(STFT) to process FH at first, then obtained the peak sequence from the results of STFT, and sampled the peak sequence in single-bit way, so the hop duration estimation could be obtained from the final single-bit sample sequence. The algorithm was simulated and its results and performance were analyzed. It is showed that the algorithm is efficient when SNR is greater than -1 dB. The method is simple, effective and easy to be implemented.