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介绍一种采用微机进行实时控制的全数字化测距器的基本原理.对于单脉冲跟踪雷达测距器,其主要任务是:准确地测定混有噪声的回波信号脉冲相对于发射基准脉冲的时间位置并连续跟踪其变化.对回波信号脉冲时间位置的单次测量由时间鉴别器完成,而时间位置序列的平滑滤波则由平滑滤波器解决.本方案的特点,就是采用微机(Z8000)作为一个具有一定传递函数的数字滤波器,能有效地滤去测量信号脉冲时间位置序列中的噪声干扰,并能得到稳定的信号脉冲时间位置的估值.而时间鉴别器则采用一种新颖的“计数相减”方案,使整个系统的跟踪惯性小、精度高.最后给出系统工作流程图及实验结果.
The basic principle of an all-digital range finder with microcomputer real-time control is introduced.For the single-pulse tracking radar range finder, its main task is to accurately measure the time of the noisy echo signal pulse relative to the transmit reference pulse Position and continuous tracking of changes in the echo signal pulse time position of a single measurement by the time discriminator to complete the time position sequence smoothing filter by the smoothing filter to solve the characteristics of this program is the use of computer (Z8000) as A digital filter with a certain transfer function can effectively filter out the noise interference in the time sequence of the pulse duration of the measurement signal and obtain a stable estimation of the time position of the signal pulse.The time discriminator uses a novel “ Count subtraction ”scheme, so that the tracking inertia of the whole system is small and the precision is high.Finally, the system working flow chart and experimental results are given.