Patent ID: 7138939

Claim:
A radar comprising: a transmission section that switches between a first frequency and a second frequency to transmit a transmission wave having one of the first frequency and the second frequency; a predetermined schedule generated on a basis of a pseudo noise code; a switch period between the first frequency and the second frequency in the transmission wave equal to or larger than a period determined by a code length of the pseudo noise code; a reception section that receives a reflected wave of the transmission wave transmitted by the transmission section; a transmission switch section that switches between turning-on and turning-off of an operation of the transmission section at the predetermined schedule; a delay section that delays the predetermined schedule; a reception switching section that switches between turning-on and turning-off of an operation of the reception section according to the predetermined schedule delayed by the delay section; a difference frequency processing section that outputs a difference frequency between the transmission wave and the reflected wave as a detection waveform; and a calculation section that calculates a distance to an object on a basis of a delay amount, which the delay section gives to the predetermined schedule, when the detection waveform has a difference frequency between the first frequency and the second frequency.