航法精度測定用レーダの等価応答ビーム幅についての一考察

抄録

A simple height finding radar, the navigation accuracy measurement system (NAMS) has been developed and used for data collection of height keeping errors of aircraft. The height estimation accuracy of NAMS depends upon the accuracy of radar sensors, the trajectory of an aircraft and the number of data acquisition. The number of data acquisition: n is one of key factors which effect on the accuracy. This n depends upon the effective beam width of NAMS's antenna and geometrical configuration between the aircraft and the antenna. The effective beam width of NAMS is studied both theoretically and empirically in ordar to estimate the number of data acquisition of NAMS. The theoretical approach is based on a radar equation and an approximated beam pattern of NAMS's antenna. TLe number of data acquisition estimated from the effective beam width is discussed herein. This paper deals with a method of calculation, empirical data obtained from actual aircraft, and the comparison of computed results with observed data by NAMS.