Patent ID: 6424289
Filing Date: 2002-07-23
Classification: G01S

Abstract:
An obstacle detection device comprising:signal transmitting and receiving means for detecting an obstacle, comprising a first leaky transmission path on a transmitting side for radiating a signal for detection of an obstacle and a second leaky transmission path located opposite the first leaky transmission path and receiving the signal for detection of an obstacle; spread spectrum signal transmitting means connected to one end of the first leaky transmission path, for generating a spread spectrum signal for detecting an obstacle based on a spread code and causing the first leaky transmission path to radiate the spread spectrum signal for detection of an obstacle; and spread spectrum signal receiving means connected to one end of the second leaky transmission path opposite the end to which the spectrum signal transmitting means is connected to the first leaky transmission path and comprising: reference spread spectrum signal generation means for generating a reference spread spectrum signal based on a spread code of a code series identical to that used by the spread spectrum signal transmitting means; correlation means for calculating a level of correlation between the reference spread spectrum signal generated by the reference spread spectrum signal generation means and the spread spectrum signal for detection of an obstacle received by the second leaky transmission path, based on a spread code phase-locked to the spread code of the spread spectrum signal for detection of an obstacle detected by the second leaky transmission path; and detection means for detecting an obstacle based on a change of a correlation level calculated by the correlation means.