| 摘要 |
PURPOSE:To make it possible to measure various origins of a moving target, by a method wherein a band path filter, a coherent oscillator and a frequency control apparatus for controlling both of them are used to divide a frequency zone to be analyzed and frequency analysis is carried out at every the divided zones. CONSTITUTION:The reflected wave from a traget is converted to the sum of intermediate frequency f1F and doppler frequency fd by a receiver 4 and the signal of the f1F+fd frequency is inputted to a band path filter BPF8. Because, in the (m)th BPF8, the path zone thereof is set to Bm being one obtained by dividing a total zone B to be analyzed into M zones, the signal is passed only through fm1<f1F+fd<=fm2. The output frequency fmc of a coherent oscillator COHO6 supplied to a phase wave detector 5 is set to fm1. By this mechanism, the output zone of a wave detector 5 is converted to 0-fd max/M to be inputted to a frequency analyzer 7. |
