SURVEILLANCE SYSTEM AND METHOD

• US 20130093615A1
• Filed: 10/12/2012
• Published: 04/18/2013
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Hanwha Vision Company Limited (Hanwha Corporation)
• Original Assignee: Samsung Techwin Corporation (Hanwha Corporation)
• Inventors: JEON, Ki-Yong
• Granted Patent: US 9,268,010 B2
• Time in Patent Office: Days
• US Class Current: 342/118
• CPC Class Codes: G01S 13/003 Bistatic radar systems; Multistatic radar systems
• CPC Class Codes: G01S 13/867 Combination of radar systems with cameras
• CPC Class Codes: G01S 7/4004 of parts of a radar system
• CPC Class Codes: G08B 13/19695 Arrangements wherein non-video detectors start video recording or forwarding but do not generate an alarm themselves

Abstract

Provided is a surveillance system including a radar transmitter which transmits a detection signal to an object existing within a surveillance region, and at least one radar receiver which is installed separate from the radar transmitter within the surveillance region, receives a signal reflected by the object, and predicts a signal distance of the object which is a sum of a distance from the radar transmitter to the object and a distance from the object to the at least one radar receiver.

Claims

1. A radar receiver comprising:

a signal receiving unit which receives a signal reflected from an object based on a detection signal transmitted from a radar transmitter, which is separately disposed from the radar receiver and the object in a surveillance zone; and

a signal processor which, based on the reflected signal, predicts a signal distance of the object which is a sum of a distance from the radar transmitter to the object and a distance from the object to the radar receiver.

2. The radar receiver of claim 1, further comprising a synchronizer which receives a synchronization signal from at least one of the radar transmitter and a server, and controls the radar receiver to synchronize with the at least one of the radar transmitter and the server using the synchronization signal,

wherein the signal processor predicts the signal distance of the object further based on the synchronization signal.

3. The radar receiver of claim 2, wherein the synchronizer transmits a synchronization request signal to the at least one of the radar transmitter and the server, and receives the synchronization signal in response to the synchronization request signal.

4. The radar receiver of claim 3, wherein the synchronization request signal comprises a first time stamp indicating a time when the synchronizer transmits the synchronization request signal to the at least one of the radar transmitter and the server, and

wherein the synchronization signal comprises a second time stamp indicating a time when the at least one of the radar transmitter and the server transmits the synchronization signal to the synchronizer of the radar receiver, and

wherein the synchronizer calculates an error value by using the synchronization signal and controls the radar receiver to synchronize with the at least one of the radar transmitter and the server.

5. The radar receiver of claim 4, wherein the second time stamp further indicates a time when the at least one of the radar transmitter and the server receives the synchronization request signal, and

wherein the synchronizer calculates the error value by further using a time when the synchronizer receives the synchronization signal.

6. The radar receiver of claim 2, wherein if the synchronization signal is received from the radar transmitter, the synchronization signal comprises an identification code which identifies the radar transmitter from another radar transmitter and the server.

7. The radar receiver of claim 1, the signal receiving unit further receives the detection signal transmitted from the radar transmitter, and predicts the signal distance based on the reflected signal and the detection signal.

8. The radar receiver of claim 7, further comprising a synchronizer which receives a synchronization signal from at least one of the radar transmitter and a server, and controls the radar receiver to synchronize with the at least one of the radar transmitter and the server using the synchronization signal,

wherein the signal processor predicts the signal distance of the object further based on the synchronization signal.

12. A surveillance system comprising:

the radar receiver of claim 1; and

the radar transmitter.

13. The surveillance system of claim 12, wherein the radar transmitter comprises:

a signal transmitting unit which transmits the detection signal to the object; and

a synchronizer which transmits a synchronization signal to the radar receiver, which exists in the surveillance zone separately from the radar transmitter and receives the reflected signal, to synchronize with the radar receiver.

14. The surveillance system of claim 13, wherein the radar receiver predicts the signal distance of the object further based on the detection signal and the synchronization signal.

15. The surveillance system of claim 14, further comprising a video processing device which receives the signal distance from the radar receiver to detect a location of the object, and generates a control signal for controlling a camera to be directed toward the object, to control a photographing direction of the camera.

9. A radar transmitter comprising:

a signal transmitting unit which transmits a detection signal to an object which exists in a surveillance zone; and

a synchronizer which performs synchronization with a radar receiver which exists in the surveillance zone separately from the radar transmitter and receives a signal reflected from the object based on the detection signal,

wherein the radar receiver predicts a signal distance of the object which is a sum of a distance between the radar transmitter and the object and a distance between the object and the radar receiver based on the reflected signal.

10. The radar transmitter of claim 9, wherein the synchronizer of the radar transmitter transmits a synchronization signal to the radar receiver to perform the synchronization with the radar receiver or receives a synchronization signal from a server installed outside the radar transmitter to perform the synchronization with the radar receiver.

11. The radar transmitter of claim 10, wherein the radar receiver predicts the signal distance further based on the synchronization signal.

16. A surveillance method comprising:

receiving, at a radar receiver, a signal reflected from an object based on a detection signal transmitted from a radar transmitter, which is separately disposed from the radar receiver and the object in a surveillance zone; and

predicting a signal distance of the object which is a sum of a distance from the radar transmitter to the object and a distance from the object to the radar receiver, based on the reflected signal.

17. The method of claim 16, further comprising:

receiving at the radar receiver a synchronization signal from at least one of the radar transmitter and a server; and

controlling the radar receiver to synchronize with the at least one of the radar transmitter and the server using the synchronization signal,

wherein the signal distance of the object is predicted further based on the synchronization signal.

18. The method of claim 17, further comprising transmitting a synchronization request signal from the radar receiver to the at least one of the radar transmitter and the server,

wherein the synchronization signal is received in response to the synchronization request signal.

19. The method of claim 18, wherein the synchronization request signal comprises a first time stamp indicating a time when the radar receiver transmits the synchronization request signal to the at least one of the radar transmitter and the server, and

wherein the synchronization signal comprises a second time stamp indicating a time when the at least one of the radar transmitter and the server transmits the synchronization signal to the radar receiver, and

wherein the controlling the radar receiver to synchronize is performed by calculating an error value by using the synchronization signal.

20. The method of claim 19, wherein the second time stamp further indicates a time when the at least one of the radar transmitter and the server receives the synchronization request signal, and

wherein the calculating the error value is performed further using a time when the radar receiver receives the synchronization signal.