Civil aviation passive coherent location system and method
First Claim
1. A system for enhancing object state awareness to track a plurality of approaching airborne objects, comprising:
- a receiver subsystem to receive reference signals from an uncontrolled transmitter and scattered transmissions originating from the uncontrolled transmitter and scattered by an object of said plurality of approaching airborne objects;
a front-end processing subsystem to determine a radial velocity of the object based on the received transmissions; and
a back-end processing subsystem to determine object state estimates based on the determined radial velocity.
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Accused Products
Abstract
A civil aviation passive coherent location system and method is disclosed. A receiver subsystem receives reference transmissions from an uncontrolled transmitter. The receiver subsystem also receives scattered transmissions originating from the uncontrolled transmitter and scattered by an airborne object. The received transmissions are compared to determine measurement differentials, such a frequency-difference-of-arrival, a time-difference-of-arrival and an angle of arrival. From the measurement differentials, an object state estimate is determined. A previous state estimate may be updated with the determined state estimate. Processing subsystems determine the measurement differentials and state estimates.
66 Citations
30 Claims
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1. A system for enhancing object state awareness to track a plurality of approaching airborne objects, comprising:
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a receiver subsystem to receive reference signals from an uncontrolled transmitter and scattered transmissions originating from the uncontrolled transmitter and scattered by an object of said plurality of approaching airborne objects;
a front-end processing subsystem to determine a radial velocity of the object based on the received transmissions; and
a back-end processing subsystem to determine object state estimates based on the determined radial velocity. - View Dependent Claims (2, 3, 4, 5)
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6. A passive coherent location system for monitoring a predetermined location within airspace, comprising:
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a receiver subsystem to receive scattered transmissions scattered by an object within said airspace and to output digitized signals of said scattered transmissions said scattered transmissions originating from an uncontrolled transmitter;
a front-end processing subsystem to determine a frequency-difference-of-arrival for said digitized signals; and
a back-end processing subsystem to determine positional information for said object in accordance with said frequency-difference-of-arrival. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21)
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14. A method for determining an updated state estimate for an object, comprising:
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receiving a reference transmission from an uncontrolled transmitter and a scattered transmission that originated from said uncontrolled transmitter and that was scattered by the object;
comparing the received transmissions to determine a measurement differential;
updating a previous state estimate based on the determined measurement differential; and
issuing a warning when said object is within a predetermined distance from a ground location.
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22. A method for determining an updated state estimate for an object, comprising:
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receiving a reference transmission from an uncontrolled transmitter and a scattered transmission that originated from said uncontrolled transmitter and was scattered by the object;
comparing the received transmissions to determine a measurement differential;
updating a previous state estimate based on the measurement differential; and
issuing a warning when said object undertakes an airpath, wherein said airpath intersects with another object. - View Dependent Claims (24, 25, 26, 27)
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23. A method for tracking an object using a civil aviation passive coherent location system, comprising:
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selecting a transmitter transmitting a reference transmission;
receiving said reference transmission;
receiving a scattered transmission scattered by an object within an airspace, wherein said scattered transmission is transmitted from said transmitter;
comparing said scattered transmission to said reference transmission to determine measurement differentials; and
updating an object state estimate according to said measurement differentials.
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28. A system for determining an updated state estimate for an object, comprising:
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means for receiving a reference transmission from an uncontrolled transmitter and a scattered transmission that originated from said uncontrolled transmitter and was scattered by the object;
means for comparing the received transmission to determine a measurement differential;
means for updating a previous state estimate based on the determined measurement differential; and
means for issuing a warning when said object is within a predetermined distance.
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29. A system for determining an updated state estimate for an object, comprising:
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means for receiving a reference transmission from an uncontrolled transmitter and a scattered transmission that originated from said uncontrolled transmitter and was scattered by the object;
means for comparing the received transmission to determine a measurement differential;
means for updating a previous state estimate based on the measurement differential; and
means for issuing a warning when said object undertakes an airpath, wherein said airpath intersects with another object.
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30. A system for tracking an object using a civil aviation passive coherent location system, comprising:
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means for selecting a transmitter transmitting a reference transmission;
means for receiving said reference transmission;
means for receiving a scattered transmission scattered by an object within an airspace, wherein said scattered transmission is transmitted from said transmitter;
means for comparing said scattered transmission to said reference transmission to determine measurement differentials; and
means for updating object state estimate according to said measurement differentials.
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Specification