| 摘要 |
<p>PURPOSE:To provide an airborne radar for aircrafts by which the time required for detecting the difference in height between obstructions and information about the cross sections of the obstructions can be shortened when an aircraft avoids or tracks the terrain. CONSTITUTION:A transmission device 17 which is capable of transmitting transmission pulse signals on a fan beam within a desired covering area is provided and a beam forming circuit 21 is provided which forms a pair of reception beams of the same azimuth and of different angles of elevation and which is capable of forming through time division a plurality of reception beams having the same azimuth and continuously varying angles of elevation. A monopulse arithmetic circuit 22, which calculates the addition and difference of reception signals which of plural reception beams a pair of reception beams having different angles of elevation in the direction of the azimuth receive as well as the addition and difference of reception signals received by two reception beams being adjacent each other in the direction of the angle of elevation, is provided at the rear stage of the beam forming circuit 21.</p> |
