Method and apparatus for ADS-B validation, active and passive multilateration, and elliptical surviellance
First Claim
1. A method of assessing validity of an aircraft position report, comprising the steps of:
- receiving, from a first receiver, a radio signal from the aircraft,generating a first time-stamp indicating the time the radio signal from the aircraft is received at the first receiver,calculating, from the aircraft position report and the first time stamp, a predicted value for a second time stamp at a second receiver located at a position different from the first receiver,receiving, from the second receiver, the radio signal from the aircraft,generating a second time-stamp indicating the time the radio signal from the aircraft is received at the second receiver,comparing the predicted value for the second time stamp with the generated second time stamp, anddetermining validity of an aircraft position report as a function of the comparison of the predicted value for the second time stamp with the generated second time stamp.
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Accused Products
Abstract
A system and method are disclosed to track aircraft or other vehicles using techniques including multilateration and elliptical surveillance. Unlike conventional approaches that use time difference of arrival for multilateration at a fixed set of reception points, this technique allows targets to be tracked from a number of dynamic or moving reception points. This allows for triangulation/multilateration and elliptical surveillance of targets from combinations of fixed, fixed and moving or only moving ground-based receivers, sea-based receivers, airborne receivers and space-based receivers. Additionally this technique allows for ADS-B validation through data derived from only two receivers to assess the validity and integrity of the aircraft self-reported position by comparing the time of arrival of the emitted message at the second receiver to the predicted time of message arrival at the second receiver based on the self-reported position of the aircraft and the time of arrival at the first receiver. The benefits of using less than three receivers for validation include greater validation coverage areas using a smaller set of ground stations at a lower infrastructure cost.
219 Citations
10 Claims
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1. A method of assessing validity of an aircraft position report, comprising the steps of:
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receiving, from a first receiver, a radio signal from the aircraft, generating a first time-stamp indicating the time the radio signal from the aircraft is received at the first receiver, calculating, from the aircraft position report and the first time stamp, a predicted value for a second time stamp at a second receiver located at a position different from the first receiver, receiving, from the second receiver, the radio signal from the aircraft, generating a second time-stamp indicating the time the radio signal from the aircraft is received at the second receiver, comparing the predicted value for the second time stamp with the generated second time stamp, and determining validity of an aircraft position report as a function of the comparison of the predicted value for the second time stamp with the generated second time stamp. - View Dependent Claims (2, 3, 4, 5)
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6. A system for assessing validity of an aircraft position report, comprising the steps of:
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a first receiver, for receiving a radio signal from the aircraft, a first time-stamp generator, for generating a first time-stamp indicating the time the radio signal from the aircraft is received at the first receiver, a processor, for calculating, from the aircraft position report and the first time stamp, a predicted value for a second time stamp at a second receiver located at a position different from the first receiver, a second receiver, for receiving the radio signal from the aircraft, and a second time-stamp generator, for generating a second time-stamp indicating the time the radio signal from the aircraft is received at the second receiver, wherein the processor further compares the predicted value for the second time stamp with the generated second time stamp, and determining validity of an aircraft position report as a function of the comparison of the predicted value for the second time stamp with the generated second time stamp. - View Dependent Claims (7, 8, 9, 10)
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Specification