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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J_1一阶边带时,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.
This paper is divided into two parts.The first part analyzes the reasons for the low altitude limit of FM continuous-wave Doppler navigation radar.It is proved that the frequency-modulated continuous wave Doppler radar can work to zero height when taking the first order sideband of J_1, otherwise, And deduces the calculation method of its minimum height.The second part focuses on the analysis of the reasons for the low height limit of pulse system Doppler radar.The simple and practical calculation method of the minimum height is deduced.Using this method The minimum height of the AN-APN220C Doppler radar is calculated and the calculated result is consistent with the measured values of the American Ryanair.