与直接阈值检测相比,采用数字相关技术是提高激光脉冲测距系统灵敏度的有效途径。引入数字极性相关算法,可以有效地减少相关函数处理所需的硬件支出,在单个超大规模集成电路(VLSI)芯片上实现并行的相关运算,提高数据吞吐量。通过仿真计算验证了此数字极性相关系统在弱信号激光测距中的效果,分析了脉冲重复频率、起始处延时、脉冲间隔抖动、脉冲宽度以及采样频率对输出结果的影响,为设计适用于数字相关检测的激光光源提供了理论依据。

The real-time signal processing of laser pulses is one of the key technologies in the laser rangefinding. The increased ability of anti-jamming and detectable distance are the main problems to be solved. Comparing with the direct threshold detection method, digital correlation techniques offer a good possibility for improving the sensitivity of pulsed laser ranging system. The digital polarity correlation function is introduced, which can effectively reduce the hardware expended and achieve the parallel correlation computations in a single very large scale integration (VLSI) chip to increase the data throughput. Based on this digital polarity correlation system, some simulations are presented to confirm the feasibility of estimating time-of-flight from the noisy echoes, and an analysis of the influences on correlation results caused by pulse repetition rate, arrival delay, interval jitter, pulse width and sampling frequency is carried out, which provides a theory basis for laser transmitter designs used in correlation-based measurement systems.