Patent ID: 8629799

Claim:
A method of investigating a target zone utilizing a radar system that includes a transmitter and a receiver, said method comprising: generating a direct sequence spread spectrum (DSSS) code having a code length corresponding to a time duration of radio wave travel between said transmitter, said target zone, and said receiver, wherein said generating operation comprises generating a pseudo-noise (PN) sequence of chips, said PN sequence having a sequence length, and expanding said PN sequence of said chips to yield said DSSS code having said code length, said code length being greater than said sequence length; transmitting a beacon signal from said transmitter toward said target zone, said beacon signal produced by modulating a continuous wave signal by inserting said DSSS code into said continuous wave signal; receiving a return signal at said receiver in response to said transmitting operation; comparing said return signal to a replica signal characterized by said DSSS code; and ascertaining a presence of an object in said target zone when said return signal corresponds to said replica signal.