| 摘要 |
<p>PURPOSE:To provide a device suppressing the direct waves from a transmitting device mixed when the target reflected echo is received and precisely measuring the propagation path length of the target reflected echo in a bi-static radar. CONSTITUTION:An unnecessary direct wave suppressor 15 utilizes the synchronous signal v(nT) obtained by receiving the transmitted waves 6c directly transmitted to a receiving device 10 from a transmitting device 1 with an auxiliary antenna 12, approximately synthesizes the constituent of the unnecessary direct waves 6b received concurrently with the target reflected echo 7 by a main receiving antenna 11, and subtracts it from the main antenna received signal u(nT) to extract the signal constituent y(nT) by the target reflected echo 7. The time delay of the signal constituent y(nT) by the target reflected echo 7 against the output signal x(nT) of a delay unit 16 receiving the synchronous signal v(nT) is estimated 17 in the unit time of the sampling interval or below of an A/D converter 14 with the correlation function, and the propagation path length of the target reflected waves 7 is obtained from the result.</p> |
