| 摘要 |
An influence of signal distortion which occurs during adjustment of the gain of a receiving unit of a radar apparatus is reduced, and degradation of a reception signal is improved. A pulse signal is produced as a transmission signal in a pulse generating section 101, and repetitively transmitted from an antenna 104 at constant time intervals. A reception signal which is received through an antenna 106, and which includes a reflective wave from an object is amplified in an amplifier 107, and gain-adjusted in a variable attenuator 108. Thereafter, a distance detecting section 111 detects a reception pulse of the reflected wave, and calculates the distance to the object. The variable attenuator 108 attenuates the reception signal by a gain which is adjusted in accordance with a gain control signal supplied from a gain adjusting section 113. The gain (attenuation amount) of the variable attenuator 108 is controlled so as to be maximum immediately after the pulse signal is transmitted, and to be reduced with elapse of time. Based on a gain adjustment timing signal supplied from a timing adjusting section 112, a gain adjustment timing when the attenuation amount is changed is made different for each transmission of the pulse signal. |
