JPS6488388A - Radar equipment - Google Patents

Abstract

PURPOSE:To obviate the troublesomeness of an operation by constituting the titled equipment so that it is switched automatically to an operation mode by a circularly polarized wave, and an operation mode by a linearly polarized wave, when a reflected wave from a rain, etc., exists, and when a reflected wave from a rain, etc., does not exist, respectively. CONSTITUTION:A signal from a dummy port of a circularly polarized wave generator 13 is inputted to a receiver 31, and when a reflected wave from a rain, etc., exists at the time of an operation mode by a circularly polarized wave, a weather video is obtained in an output of the receiver 31. A switch 32 receives this weather video and a received 21 normal video, and selects and outputs one of them by a switching signal from a control circuit 40. This signal is brought to digital conversion 33, brought to sample holding 34b, compared 35, and with regard to a video data which has exceeded a reference value A, a prescribed active signal is outputted, and a counter 36 is counted up by one. The total count number by the counter 36 is compared with a reference value B or C by a comparator 37, and based on a fact that said number has exceeded the reference value B, it can be detected that a reflected wave from a rain, etc., can be detected, and based on a fact that said number has become below the reference value C, it can be detected that the reflected wave from a rain, etc., has annihilated.