在研究精密测距系统(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.%Distance measuring theory and pattern of Precision Distance Measuring Equipment (PDME) are studied. The distance error caused by the amplitude difference of inquiry signal is analyzed. Aiming at IA and FA working patterns, time measuring error caused by the amplitude difference of inquiry signal is studied based on the expression of measuring pulse and judging gate. The distance error is reckoned based on theory of PDME. The distance error is simulated and the results are given.
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