位同步技术是空间激光通信和测控一体化的关键技术之一, 位同步的精确与否直接影响整个系统的性能。针对空间激光通信位同步技术中基于Gardner定时误差估计算法易受系统自噪声干扰, 提出了一种自噪声抑制Gardner算法, 同时基于此算法提出一种位同步环路。通过对算法理论分析与环路建模仿真结果表明, 在Eb/N0大于9 dB情况下, 提出自噪声抑制Gardner算法与位同步环路能够有效地降低同步过程中由于系统自噪声引起的定时抖动, 并且拥有更快的位同步建立的时间。

Bit synchronization is one of the key technologies of space laser communication and measurement and control unified system. Its accuracy directly affects the performance of the whole system. Bit synchronous technique based on Gardner algorithm is easy to be interfered by self-noise of system. A self-noise abatement Gardner algorithm was proposed and a synchronous loop was presented based on this algorithm. Theoretical analysis and simulation results show that the self-noise abatement Gardner algorithm and the synchronous loop can effectively reduce the timing jitter caused by systems self-noise and have a faster bit synchronization establishing time when Eb/N0 is greater than or equal to 9 dB.