| 摘要 |
<p>PURPOSE:To improve cross range resolution without deteriorating distance performance nor an observable range by converting echo signals, received through plural antenna elements, from analog to digital and then performing digital processing. CONSTITUTION:A transmitter 1 outputs a send signal having wide beam width thetaB to an observation object through a transmitting antenna 23. For reception, N thin received beams #1 = #N (beam width thetab=thetaB/N) which are directed to respective small areas in the observation object by using a digital beam forming antenna 30 and echo signals from the respective small areas are received at the same time. The respective echo signals are improved in range resolution and cross range resolution by a pulse compressing device 5 and an azimuth compressing device 6 and stored in display buffers 7 respectively. At this time, an inertial navigation device 11 outputs parameters corresponding to the respective received beams to respective reference signal generating devices 10 and azimuth compression is carried out. Here, PRF >=2vthetaB/lambdaN (v: moving speed of radar, lambda: transmission wavelength) and a decrease to 1/N is made.</p> |
