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本文介绍了一种用于导航的空载单向多普勒测量系统,误差分析表明:量化误差是多普勒测量的主要误差源。比较了几种减小量化误差的测量技术,着重介绍了符合比较法测频的工作原理、符合产生的条件。参数的选择,并分析了误差,分析表明,它能用低速逻辑器件获得高的多普勒分辨度。最后简单地介绍了国外已研制成的一种样机的框图和性能,结论是:在S波段,当平均时间为1秒钟时,多普勒测量精度优于0.02赫,这相当于距离变化率的测量误差不大于3毫米/秒。
In this paper, an unloaded one-way Doppler measurement system for navigation is introduced. The error analysis shows that the quantization error is the main error source of Doppler measurement. Several measurement techniques to reduce the quantization error are compared, and the working principle of frequency measurement in accordance with the comparison method is emphatically introduced, which is in line with the conditions of generation. The choice of parameters and the analysis of the error show that it achieves high Doppler resolution with low-speed logic devices. Finally, a brief introduction to the block diagram and performance of a prototype has been developed abroad. The conclusion is: in the S band, when the average time is 1 second, Doppler measurement accuracy is better than 0.02 Hz, which is equivalent to the rate of change of distance The measurement error is not more than 3 mm / sec.