Patent ID: 9551784
Date: 2017-01-24
CPC Classifications: G01S,G08B

Claim:
1. A method for intrusion detection, comprising: transmitting a direct sequence spread spectrum (DSSS) signal, wherein the signal includes a chipping sequence formed from multiple chips and wherein a chip length is a time between each of the chips and the chip length determines a time period corresponding to a phase delay; receiving a reflected DSSS signal from a target, via a receiver; determining the phase delay by correlating the reflected DSSS signal and the transmitted DSSS signal based upon comparison of the chipping sequences of the reflected DSSS signal and the transmitted DSSS signal; determining a distance to the target based on the phase delay between the reflected DSSS signal and the transmitted DSSS signal; and determining a location of the target based on an azimuth of the reflected DSSS signal and the distance to the target, wherein the azimuth of the reflected DSSS signal is an angle at which the receiver receives the reflected DSSS signal.