Identification and location system for personnel and vehicles
First Claim
1. A surveillance system, comprising:
- a surveillance unit;
at least one Identification-Friend or Foe (IFF) unit coupled to at least one object; and
a processing facility;
said surveillance unit transmits surveillance signals to all objects within a surveillance area, and upon receipt of reflections of said transmitted signals determines locations of said objects relative to the location of said surveillance unit and communicates said determined locations to said processing facility;
said at least one IFF unit coupled to at last one object responsive to said surveillance signals exceeding a predetermined power level for broadcasting messages containing identification and location information of said object coupled to said IFF unit to said processing facility;
said processing facility compares said broadcast messages from said IFF units with said communications from said surveillance unit and performs computations including determination of all locations of all properly authorized objects within said surveillance area, identification of objects not authorized to be in said surveillance area, and generation of appropriate notice.
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0 Petitions
Accused Products
Abstract
A surveillance system is provided for surveillance of objects within a secure area. A surveillance sensor transmits surveillance signals to all objects within the secure area, the reflections of which are received back by the surveillance sensor to determine the locations of objects, and communicates the determined locations to a pressing facility. Objects authorized to be in the secure area are equipped with an Identification Friend or Foe (IFF) unit that includes a GPS receiver and a data communication transmitter. In response to predetermined conditions, the IFF units broadcast their position and identification to the processing facility for correlation with locations defined by the reflection signals. The reflection signals from other objects are compared with a list of the locations of objects, such as terrain features and man-made facilities, that are known to be in the secure area If no broadcast information is received from an object and the location of that object determined by the reflection signal cannot be correlated with the known object list; than the object has no proper authorization to be within the secure area, and an alarm is generated.
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Citations
15 Claims
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1. A surveillance system, comprising:
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a surveillance unit;
at least one Identification-Friend or Foe (IFF) unit coupled to at least one object; and
a processing facility;
said surveillance unit transmits surveillance signals to all objects within a surveillance area, and upon receipt of reflections of said transmitted signals determines locations of said objects relative to the location of said surveillance unit and communicates said determined locations to said processing facility;
said at least one IFF unit coupled to at last one object responsive to said surveillance signals exceeding a predetermined power level for broadcasting messages containing identification and location information of said object coupled to said IFF unit to said processing facility;
said processing facility compares said broadcast messages from said IFF units with said communications from said surveillance unit and performs computations including determination of all locations of all properly authorized objects within said surveillance area, identification of objects not authorized to be in said surveillance area, and generation of appropriate notice. - View Dependent Claims (2, 3, 4, 5)
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6. An Identification-Friend or Foe (IFF) unit, comprising:
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a radar signal detector;
a GPS receiver; and
a data communication transmitter;
said GPS receiver receives signals from GPS satellites and derives data including current time and IFF unit location;
said radar signal detector responds to surveillance radar main beam and generates commands to transmit data;
said data communication transmitter responsive to each said command to transmit data broadcasts a message containing identification information, and GPS derived time and position of said IFF unit.
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7. A surveillance system, comprising:
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a surveillance unit;
at least one Identification-Friend or Foe (IFF) unit coupled to at least one object; and
a processing facility;
said surveillance unit transmits surveillance signals to all objects within a surveillance area, and upon receipt of reflections of said transmitted signals determines locations of said objects relative to the location of said surveillance unit and communicates said determined locations to said processing facility;
said at least one IFF unit coupled to at last one object broadcasts repeatedly at predetermined times messages containing identification and location information of said object coupled to said IFF unit to said processing facility;
said processing facility compares said broadcast messages from said IFF units with said communications from said surveillance unit and performs computations including determination of all locations of all properly authorized objects within said surveillance area, identification of objects not authorized to be in said surveillance area, and generation of appropriate notice. - View Dependent Claims (8, 9, 10, 11)
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12. An Identification-Friend or Foe (IFF) unit comprising:
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a GPS receiver;
a transmit controller; and
a data communication transmitter;
said GPS receiver receives signals from GPS satellites and derives data including current time and IFF unit location;
said transmit controller compares said current time with predetermined times of transmission stored in memory, and generates commands to transmit data;
said data communication transmitter responsive to each said command to transmit data broadcasts a message containing identification information, and GPS derived time and position of said IFF unit. - View Dependent Claims (13)
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14. An Identification-Friend or Foe (IFF) unit, comprising
a GPS receiver; - and
a bi-directional communication device;
said GPS receiver receives signals from GPS satellites and derives data including current time and IFF unit location;
said bi-directional communication device responds to a received command and broadcasts a message containing identification information, and GPS derived time and position of said IFF unit
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15. A method for identification interrogation, comprising the steps of:
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a) transmitting at least one surveillance signal;
b) determining location of at least one object based on a reflection of said transmitted surveillance signal from said object;
c) broadcasting at least one message containing identification and position information from said at least one object; and
d) correlating said location information from said reflection signal with said broadcast information from said object to determine location of said object properly authorized to be within a surveillance area
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Specification