RANGE FINDING RADAR

摘要

PURPOSE: To synchronously acquire a target in a short period of time without enlarging a current hardware even in the case a comparatively large error is included in a synchronous initial value in a range finding radar using spectrum spread. CONSTITUTION: A first switching circuit 17 to switch demodulation signals at target acquisition and synchronous maintenance over to each other is installed on a synchronous maintenance circuit, a precise synchronous initial value is found by a mode controller 22 by way of comparing amplitude of a first amplitude comparator 9 and a second amplitude comparator 18 with each other at the time of synchronous acquisition by an amplitude comparator 19, and a mode is transferred. The demodulation signals select output of a second phase modulator 18 by a second switching circuit 21 by way of applying delay of a pulse duration repetion period by a delay circuit 20 at the time of synchronous acquisition and select output of a third phase modulator 15 by the second switching circuit 21 at the time of synchronous maintenance and demodulate it by a second demodulator 10.