| 摘要 |
<p>PURPOSE:To achieve a smaller size of the apparatus with a suppression of a mixed signal by changing a pulse compression modulation system with respect to a transmission signal of the same frequency to make a received signal pass through pulse compression filter corresponding to respective frequency modulation stretching pulse. CONSTITUTION:A first frequency modulation pulse which is obtained by a frequency convertion 13a of a first pulse compression modulation signal 15a with respect to a first transmission signal 14a with a center frequency f1 is synthesized with a second frequency modulation pulse which is obtained by a frequency conversion 13b of a second pulse compression modulation signal 15b with respect to a second transmission signal 14b with a frequency f2 and radiated into the air after a frequency conversion 11a by a signal from a local oscillator 9. Then, reflected wave received is converted 3a into an IF signal by a signal of the oscillator 9 to be amplified 4a and distributed 5a in two and first and second frequency modulation stretching pulses are detected 7a and 7b via pulse compression filters 6a and 6b respectively to be sent to a first signal processor 8a. When a signal with a center frequency f2 of a second antenna system is mixed, the mixed signal is suppressed because of a difference in a modulation system of the filter 6a and mixed signals of other antenna systems are compressed with the filters 6a-6b respectively.</p> |
