Object detection apparatus

摘要

An object detection apparatus disposed in a moving body generates a transmission signal of multiple pulse sequences as a plurality of sequences of multiple pulses. A modulation signal of the transmission signal is generated by performing digital modulation on each of the multiple pulse sequences of the transmission signal according to a code sequence. A transmission wave based on the modulation signal is transmitted and a reflected wave of the transmission wave is received by the apparatus. The apparatus further detects a speed of the moving body to determine a length of the code sequence. The apparatus calculates a code correlation value between the modulation signal and a received signal, which is derived from the reflected wave, and performs pulse compression on the received signal based on the code correlation value to generate a pulse-compressed received signal. The apparatus detects an object based on the pulse-compressed received signal.

主权项

1. An object detection apparatus disposed in a moving body, the apparatus comprising:
a transmission signal generator generating a transmission signal of multiple pulse sequences as a plurality of sequences of multiple pulses; a modulation unit generating a modulation signal of the transmission signal by performing digital modulation on each of the multiple pulse sequences of the transmission signal according to a code sequence; a wave transmission and reception unit generating and transmitting a transmission wave based on the modulation signal from the modulation unit, and receiving a reflected wave of the transmission wave; a pulse compression unit calculating a code correlation value between the modulation signal and a received signal, and performing pulse compression on the received signal based on a calculation result of the code correlation value to generate a pulse-compressed received signal, the received signal being derived from the reflected wave received by the wave transmission and reception unit; a movement speed acquisition unit acquiring a speed of the moving body, and a stopping determination unit determining whether the moving body is stopping, wherein a length of the code sequence is modified according to the speed acquired by the movement speed acquisition unit, an object is detected based on the pulse-compressed received signal from the pulse compression unit; and when the stopping determination unit determines the moving body is stopping, the length of the code sequence is periodically switched between a first length and a second length, the second length being shorter than the first length.