Patent ID: 7498975

Claim:
A pulse radar system comprising: a pulse output circuit outputting a periodic transmission pulse and a gate pulse, the gate pulse having a cycle which is a rational multiple of a cycle of the transmission pulse and is different from the cycle of the transmission pulse; a transmission circuit generating a transmission pulse wave based on a transmission pulse from the pulse output circuit, and outputting the transmission pulse wave generated; a transmission antenna radiating a transmission pulse wave from the transmission circuit; a reception antenna receiving a reception pulse wave, the reception pulse wave being radiated from the transmission antenna as a transmission pulse wave and reflected from an object; a reception circuit demodulating the reception pulse wave from the reception antenna and outputting a reception pulse; an extracting circuit extracting a reception pulse, which is synchronized with a gate pulse from the pulse output circuit, from among reception pulses from the reception circuit, and outputting the reception pulse extracted; and a distance calculating circuit calculating a distance to the object based on an elapsed time, a phase of a transmission pulse outputted from the pulse output circuit and a cycle of the transmission pulse at the time when the reception pulse is outputted from the extracting circuit, the elapsed time being from when a transmission pulse is outputted from the pulse output circuit until a reception pulse is outputted from the extracting circuit.