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在研究精密测距系(PDME)测距原理及工作模式的基础上,分析了因询问信号幅度强弱不等引起测时误差从而导致测距误差的过程。分IA和FA两种模式,从测量脉冲前沿的数学表达式及判决门限电平的选择出发,研究因询问信号幅度强弱不等引起的测时误差,依据PDME工作原理推算测距误差。最后根据对测距误差的分析,对两种模式的测距误差情况进行了仿真,给出了仿真结果。
Based on the study of PDME distance measuring principle and working mode, the process of measuring error caused by the error of signal amplitude is analyzed. Based on the mathematical expression of the leading edge of the pulse and the choice of the decision threshold level, the IA and FA modes are studied. The error of the measurement time due to the range of signal amplitude is studied. The error of measurement is deduced according to the working principle of PDME. Finally, based on the analysis of ranging error, the error of two modes is simulated and the simulation results are given.