| 摘要 |
<p>PURPOSE:To improve the secondary echo removing ability in a radar device. CONSTITUTION:The input to a phase code circuit 1 is coded under the control of an optimum code control circuit 3 so that the code polarity may be reversed for each hit in a phase code driving circuit 2. This coded signal is converted into the intermediate frequency by a frequency converter 4 and a local oscillator 5, and in addition, converted into the micro-wave by a frequency converter 6 and a local oscillator 7, and emitted from an antenna 10 through a power amplifier 8 and a transmission/reception switch 9. The received signal is supplied to a matched filter 12 through an amplifier 11 and frequency converters 6a, 4a, and the correlated output for the transmitted signal is obtained. The characteristics of the matched filter 12 are controlled by a driving circuit 13. For the secondary echo with different coding form to be received by the matched filter 12, the pulse compression by the correlation is not realized, and the removing property of the secondary echo is improved.</p> |
