Patent ID: 7583224

Claim:
A radar apparatus comprising: an antenna for transmitting electromagnetic waves and receiving reflection waves from a target; a transmission/reception switching unit for supplying a high-frequency signal from a magnetron to the antenna and outputting a signal from the antenna; a mixer for mixing a signal output from the transmission/reception switching unit with a local oscillation signal generated in a local oscillator and outputting an IF signal of an intermediate frequency band; a band pass filter for filtering the IF signal; a detector for detecting a signal output from the band pass filter and outputting a detection signal; an A/D converter for converting the IF signal and the detection signal to digital signals; a display processor for processing the detection signal output from the A/D converter and displaying a detection picture of the target; a frequency estimating unit for estimating the frequency value of a carrier signal corresponding to main bang out of the IF signal output from the A/D converter by Fourier Transform; a frequency controller for controlling a control voltage applied to the local oscillator on the basis of the frequency estimated in the frequency estimating unit so that the frequency of the IF signal output from the mixer approaches to a predetermined target frequency a multiplexer for time-divisionally selecting a detection signal output from the wave detector and a non-detected IF signal output from the mixer, and outputting the selected signal to the A/D converter; and a signal extracting unit for extracting the signal corresponding to the main bang from the output of the A/D converter, outputting the extracted signal to the frequency estimating unit and outputting the remaining signal or the output of the A/D converter to the display processor so that the IF signal and the detection signal are converted to digital signals by one A/D converter.