METHOD AND SYSTEM FOR CORRELATING RADAR POSITION DATA WITH TARGET IDENTIFICATION DATA, AND DETERMINING TARGET POSITION USING ROUND TRIP DELAY DATA
First Claim
Patent Images
1. A method of correlating radar position data with target identification data comprising the steps of:
- using radar to determine radar position data of a first target;
transmitting a signal from a first transceiver of known location to a plurality of targets, including the first target;
receiving reply signals at the first transceiver from the plurality of targets, each reply signal including identification data about the respective target;
using the transmitted signal from the first transceiver and the reply signals to calculate a first round trip delay value for each of the plurality of targets;
using the first round trip delay value for each target to calculate a range of each target from the first transceiver;
establishing a first range window for each target relative to the first transceiver, said first range window being defined as a range tolerance centered around the calculated range based on the first round trip delay value;
using the radar position data of the first target to calculate a distance between the first target and the first transceiver;
comparing the calculated distance with the first range windows for the targets to select a first range window that encompasses the calculated distance; and
correlating the identification data from the target that corresponds to the selected first range window with the radar position data of the first target.
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Abstract
A method and system for using a single transceiver to correlate radar position data with target identification data. Two transceivers, operating in round trip delay mode, can be used to provide two possible positions for a given target when radar coverage is lost or unavailable. Three transceivers can be used to provide actual position of a given target using round trip delay data only.
21 Citations
32 Claims
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1. A method of correlating radar position data with target identification data comprising the steps of:
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using radar to determine radar position data of a first target; transmitting a signal from a first transceiver of known location to a plurality of targets, including the first target; receiving reply signals at the first transceiver from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the first transceiver and the reply signals to calculate a first round trip delay value for each of the plurality of targets; using the first round trip delay value for each target to calculate a range of each target from the first transceiver; establishing a first range window for each target relative to the first transceiver, said first range window being defined as a range tolerance centered around the calculated range based on the first round trip delay value; using the radar position data of the first target to calculate a distance between the first target and the first transceiver; comparing the calculated distance with the first range windows for the targets to select a first range window that encompasses the calculated distance; and correlating the identification data from the target that corresponds to the selected first range window with the radar position data of the first target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining position of a target, comprising the steps of:
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transmitting a signal from a first transceiver of known location to a plurality of targets; receiving reply signals at the first transceiver from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the first transceiver and the reply signals to calculate a first round trip delay value for each of the plurality of targets; using the first round trip delay value for each target to calculate a range of each target from the first transceiver; establishing a first range window for each target relative to the first transceiver, said first range window being defined as a range tolerance centered around a calculated range based on the first round trip delay value; transmitting a signal from a second transceiver of known location to the plurality of targets; receiving reply signals at the second transceiver from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the second transceiver and the reply signals to calculate a second round trip delay value for each of the plurality of targets; using the second round trip delay value for each target to calculate a range of each target from the second transceiver; establishing a second range window for each target relative to the second transceiver; clustering target reply signals received at the first transceiver with target reply signals received at the second transceiver; and determining two possible positions for each target based on the areas where the first and second range windows for each target overlap one another. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of determining position of a target, comprising the steps of:
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transmitting a signal from a first transceiver of known location to a plurality of targets; receiving reply signals at the first transceiver from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the first transceiver and the reply signals to calculate a first round trip delay value for each of the plurality of targets; using the first round trip delay value for each target to calculate the range of each target from the first transceiver; establishing a first range window for each target relative to the first transceiver, said first range window being defined as a range tolerance centered around the calculated range based on the first round trip delay value; transmitting a signal from a second transceiver of known location to the plurality of targets; receiving reply signals at the second transceiver from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the second transceiver and the reply signals to calculate a second round trip delay value for each of the plurality of targets; using the second round trip delay value for each target to calculate the range of each target from the second transceiver; establishing a second range window for each target relative to the second transceiver, said second range window being defined as a range tolerance centered around the calculated range based on the second round trip delay value; clustering target reply signals received at the first transceiver with target reply signals received at the second transceiver; determining areas where the first and second range windows for each target overlap one another; and comparing the areas of overlap with predetermined target movement area data to determine the identity and location of each target within the predetermined target movement area. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of determining position of a target, comprising the steps of:
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transmitting a signal from first, second and third transceivers of known location to a plurality of targets; receiving reply signals at the transceivers from the plurality of targets, each reply signal including identification data about the respective target; using the transmitted signal from the first, second and third transceivers and the reply signals to calculate first, second and third round trip delay values for each of the plurality of targets; using the first, second and third round trip delay values for each target to calculate a range of each target from the first, second and third transceivers, respectively; establishing first, second and third range windows for each target relative to the first, second and third transceivers, respectively, the first, second and third range windows being defined as range tolerances centered around the calculated ranges based on the first, second and third round trip delay values, respectively; clustering target reply signals received at the first, second and third transceivers based on target identification data contained in each reply signal; and determining areas where the first, second and third range windows for each target overlap one another to thereby determine the position of each target relative to the transceivers. - View Dependent Claims (23, 24, 25)
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26. A system for correlating radar position data with target identification data comprising:
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a radar to determine radar position data of a first target; a first transceiver of known location for transmitting a signal to a plurality of targets, including said first target, and for receiving reply signals from said plurality of targets at said first transceiver, each reply signal including identification data about a respective target; and means for calculating a first round trip delay value for each of said plurality of targets using said signal transmitted from said first transceiver and said reply signals of said plurality of targets; means for calculating a range of each of said plurality of targets from said first transceiver using said first round trip delay value for each of said plurality of targets; means for establishing a first range window for each target relative to said first transceiver, said first range window being defined as a range tolerance centered around the calculated range based on said first round trip delay value; means for calculating a distance between said first target and said first transceiver using radar position data of said first target; means for comparing said calculated distance with said first range window for each of said plurality of targets to select a first range window that encompasses said calculated distance of said first target; and means for correlating the identification data from said target that corresponds to the selected first range window with said radar position data of said first target.
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27. A system for determining a position of a target, comprising:
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first and second transceivers of known location for transmitting a signal to a plurality of targets and for receiving reply signals from said plurality of targets at said first and second transceivers, respectively, each reply signal including identification data about a respective target; means for calculating a first round trip delay value and a second round trip delay value for each of the plurality of targets using the transmitted signal from the first transceiver and the reply signals from the plurality of targets and the transmitted signal from the second transceiver and the reply signals from the plurality of targets, respectively; means for calculating a range of each target from the first and second transceivers using the first round trip delay value and the second round trip delay value for each target, respectively; means for establishing a first range window and a second range window for each target relative to the first transceiver and the second transceiver, respectively, said first and second range windows being defined as a range tolerance centered around the calculated range based on the first round trip delay value and the second round trip delay value for each target, respectively; means for clustering target reply signals received at the first transceiver with target reply signals received at the second transceiver; and means for comparing the first range windows and the second range windows for the targets to determine two possible positions for each of a plurality of targets based on the areas where the first and second range windows for each target overlap one another.
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28. A system for determining a position of a target, comprising:
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first and second transceivers of known location for transmitting a signal to a plurality of targets and for receiving reply signals from said plurality of targets at said first and second transceivers, respectively, each reply signal including identification data about a respective target; means for calculating a first round trip delay value and a second round trip delay value for each of the plurality of targets using the transmitted signals from the first and second transceivers and the reply signals from said plurality of targets, respectively; means for calculating a range of each target from said first and second transceivers using said first round trip delay value and said second round trip delay value, respectively; means for establishing a first range window and a second range window for each target relative to said first transceiver and said second transceiver, respectively, said first and second range windows being defined as a range tolerance centered around the calculated range based on said first round trip delay value and said second round trip delay value for each target, respectively; means for clustering said reply signals of said plurality of targets received at said first and second transceivers; means for determining areas where said first range window and said second range window for each target overlap one another; and means for comparing said areas of overlap with predetermined target movement area data to determine the identity and location of each target within the predetermined target movement area.
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29. A system for determining a position of a target, comprising:
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first, second and third transceivers of known location for transmitting signals to a plurality of targets and for receiving reply signals from said plurality of targets at said first, second and third transceivers, respectively, each reply signal including identification data about a respective target; means for calculating a first round trip delay value, a second round trip delay value and a third round trip delay value for each of said plurality of targets using the transmitted signals from said first, second and third transceivers and reply signals from said plurality of targets, respectively; means for calculating a range of each target from said first, second and third transceivers using said first, second and third round trip delay values, respectively; means for establishing a first range window, a second range window and a third range window for each target relative to said first, second and third transceivers, respectively, said first, second and third range windows being defined as a range tolerance centered around the calculated range based on said first, second and third round trip delay values, respectively; means for clustering said target reply signals received at said first, second and third transceivers; means for determining areas where said first, second and third range windows for each target overlap one another to thereby determine the location of each target relative to said transceivers.
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30. A method for a single transceiver, located proximate an airport movement area, to validate an estimated position of a target having a valid target track when radar data becomes unavailable, comprising the steps of:
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estimating a position for the target based on course and speed attributes of the target and the most recent known target position; transmitting a signal from a first transceiver of known location to the target; receiving reply signals at the first transceiver from the target, each reply signal including identification data about the target; using the transmitted signal from the first transceiver and the reply signals to calculate a round trip delay value for the target; using the round trip delay value for the target to calculate a range of the target from the first transceiver; establishing a range association window for the target relative to the first transceiver, the range association window being defined as a range tolerance centered around the calculated range based on the round trip delay value; overlaying the range association window for the target on a map of the airport movement area; determining at least one target position where the range association window for the target intersects a valid location on the airport movement area; correlating the estimated position of the target with the at least one determined target positions to confirm that the estimated position correlates with one of the at least one determined target positions; and validating the estimated position of the target only when the estimated position correlates with one of the at least one determined target positions. - View Dependent Claims (31, 32)
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Specification