A Synchronization Acquisition Algorithm in High Dynamic and Interfered Environments

High dynamic and interfered environments can seriously deteriorate the synchronization acquisition of the fast frequency hopping (FFH) spread spectrum system, which is particularly detrimental in the anti-interference systems. With the rapid development of the digital processing technologies, some synchronization acquisition algorithms in high dynamic environments have been proposed. However, these algorithms suffer from performance deterioration in the FFH system and do not analyze the acquisition performance under typical interferences. In this paper, a frequency hopping pulses (FHP)-differential adaptive anti-interference combining (DAAC) algorithm-based synchronization acquisition scheme is proposed. In particular, this algorithm combines the interference suppression method and the synchronization acquisition method, and the combining coefficients of the decision metric can be adaptively adjusted based on the interference type and the interference power. In addition, the adaptive anti-interference acquisition thresholds are derived through the constant false-alarm rate (CFAR) criterion. Theoretical and simulation results demonstrate that the proposed FHP-DAAC algorithm enhances the anti-interference and anti-high dynamic performances of the FFH receiver.