| 摘要 |
<p>In a process and device for the angular discrimination of targets by airborne radar, the angular position of a point on the ground is ascertained as a function of the Doppler frequency of an echo signal relating to the point under consideration, as determined by passband filtering the echo signals. The Doppler frequencies are selected by fast Fourier transform device 26 acting as a bank of filters, and an angular determination is made by analysing signals including a signal 37 representing the position in the bank of that filter selecting the Doppler frequency of the echo signal, and a reference frequency 35 subject to closed loop control and representing the true Doppler frequency of the point on the ground. Means 74, 81 are provided for maintain data relating to the position and the range of the target effectively constant during the process of analysis.</p> |
