多普勒导航雷达低高度性能分析与计算

本文共分两部分.第一部分分析了调频连续波多普勒导航雷达存在低高度限制的原因.证明了取J₁一阶边带时,调频连续波多普勒雷达可以工作到零高度,否则存在低高度限制,并推导出其最小起量高度的计算方法.第二部分着重分析了脉冲体制多普勒雷达存在低高度限制的原因.推导出最小起量高度的简捷而实用的计算方法,用此方法计算了AN-APN220C多普勒雷达的最小起量高度.其计算结果与美国瑞安公司的实测值相符合.

LOW ALTITUDE PERFORMANCE OF DOPPLER NAVIGATION RADAR ANALYSIS AND CALCULATION

The paper is in 2 parts. The first part is the analysis of why the low altitude is limited in frequency modification continuous wave Doppler navigation radar. It demonstrates that the radar works at zero altitude when J₁ (M₁) side frequencies are adopted. Here, J₁ (M₁) is the first order of Bessel function. Otherwise, there is a limitation in minimum altitude. The calculation method for this minimum working altitude is deduced. The second part is the analysis of why there is a low altitude limitation in pulse Doppler navigation radar and a simple and direct method for calculating the minimum working altitude is deduced. This method is used to calculate the minimum working altitude of AN-APN-220C Doppler navigation radar. It is found that the result is in agreement with the value measured by TELEDYNE RYAN Co. in U. S. A.