Radar apparatus with power saving features

摘要

The invention relates to a radar apparatus (1) for measuring any of a range, rate and azimuth angle of an object. In a radar apparatus (1) for automobiles for transmitting a radio wave, receiving a radio wave reflected from an object and measuring a rate of the object, a digital signal processor (15) has at least two operation modes, a normal operation mode and a low energy consumption mode, and has a function of switching between the operation modes of the digital signal processor (15) in accordance with a signal supplied from a counter (judgement unit) (22) for judging whether a received signal satisfies predetermined conditions. The radar apparatus (1) can reduce consumption power when necessary.