SURFACE PENETRATING RADAR SYSTEM AND TARGET ZONE INVESTIGATION METHODOLOGY
First Claim
1. 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;
transmitting a beacon signal from said transmitter toward said target zone, said beacon signal being modulated by said DSSS code;
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A radar system (22) includes a transmitter (45), a receiver (59), and a software defined radio (SDR) peripheral (40). Methodology (80) for investigating a target zone (26) utilizing the system (22) entails generating (106) a direct sequence spread spectrum (DSSS) code (120) having a code length (122) corresponding to a time duration of radio wave travel between the transmitter (45), the target zone (26), and the receiver (59) at a carrier frequency (112). A beacon signal (34), modulated (108) by the DSSS code (120), is transmitted (152) from the transmitter (45) toward the target zone (26) and a return signal (38) is received (156) at the receiver (56). The return signal (38) is compared (170) to a replica signal (168) characterized by the DSSS code (120), and presence of an object (32) in the target zone (26) is ascertained (178) when the return signal (38) matches the replica signal (168).
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Citations
20 Claims
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1. A method of investigating a target zone utilizing a radar system that includes a transmitter and a receiver, said method comprising:
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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; transmitting a beacon signal from said transmitter toward said target zone, said beacon signal being modulated by said DSSS code; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A radar system for investigating a target zone comprising:
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a transmitter configured to transmit a beacon signal toward said target zone; a receiver configured to receive a return signal following transmission of said beacon signal; a processor in communication with each of said transmitter and said receiver; and a memory element in communication with said processor, said memory element having executable code stored therein, said executable code instructing said processor to perform operations comprising; 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 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, said code length being greater than said sequence length; modulating a continuous wave signal by inserting said DSSS code into said continuous wave signal to produce said beacon signal; 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. - View Dependent Claims (15, 16, 17, 18)
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19. A method of investigating a target zone utilizing a radar system that includes a transmitter and a receiver comprising:
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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, said generating operation including; generating a pseudo-noise (PN) sequence of chips, said PN sequence having a sequence length; and expanding said PN sequence of said chips by successively replicating each said chip in said PN sequence by a chip expansion factor to yield said DSSS code having said code length, said code length being greater than said sequence length; modulating a continuous wave signal by inserting said DSSS code into said continuous wave signal to produce a beacon signal, said beacon signal having a bandwidth that is approximately equal to a frequency of said continuous wave signal divided by said chip expansion factor; transmitting said beacon signal from said transmitter toward said target zone for a transmit duration substantially equivalent to a time duration for transmission of a single instance of said DSSS code; 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. - View Dependent Claims (20)
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Specification