| 摘要 |
A target detector for accurately detecting frequency components of the stationary target, detecting a moving target from the remaining frequency components and suppressing erroneous detection of the moving target. The detector comprises: a transmitting and receiving section for transmitting a transmission wave and receiving a reflected wave from the target, the transmission wave having a frequency rising section where the frequency increases and a frequency falling section where the frequency decreases; a mixer for mixing the transmission wave and the reflected wave to generate beat signals; a frequency calculating section for calculating frequency components of the beat signals in the frequency rising section and the frequency falling section; and a stationary target frequency detecting section for, when a level of the frequency components in one of the frequency rising section and the frequency falling section exceeds a higher threshold and a level of the same frequency components in the other section exceeds a lower threshold as well as a level difference between both the frequency components is within a predetermined range, detecting these frequency components as those of the stationary target.
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