本振频率稳定度与雷达测高精度的关系

仰角误差是影响测高精度的重要参数，机内噪声是雷达产生仰角误差的原因之一。文章从分析测高精度公式开始，根据本振的噪声特性来讨论由此产生的仰角误差对测高精度带来的影响。推导出了本振的阿伦方差及相位噪声与仰角误差及测高误差的关系，通过分析和计算，证明了阿伦方差越小，测高精度越好，当低于一定程度时，本振所带来的测高误差可以忽略。

Elevation error is the important parameter of height measurement accuracy and the inner noise is one of the reason for radar＇ s elevation error. Begin with analyzing the height measurement accuracy, the influence of the elevation error on height measurement accuracy is discussed, which is generated by the internal noise of local osciliator. Deducing the relation among the Allan variance and phase noise of local oscillator, elevation error and height measurement accuracy, the result proves that the Allan variance is little, the height measurement accuracy is better, when it is little than some value, the height error come from the locat oscillator can be omitted.