Directional pruning of transmitters to improve position determination
First Claim
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1. A method for estimating a position of a receiver using a network of transmitters, the method comprising:
- identifying a set of transmitters from the network of transmitters;
using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters;
determining, for each group of the three or more groups, a number of transmitters included in that group;
for each group of the three or more groups that includes a number of transmitters that is less than an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two;
for each group of the three or more groups that includes a number of transmitters that is equal to or greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and
determining, using at least one processor, an estimated position of the receiver using all of the identified range measurements.
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Abstract
Described are systems and methods for estimating a position of receiver using ranging signals from different regions in a network of transmitters. In some embodiments, each ranging signal that exceeds a quality criterion is assigned to one of several defined regions based on a characteristic of that ranging signal. A maximum number of ranging signals per region may be selected and used during trilateration.
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Citations
36 Claims
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1. A method for estimating a position of a receiver using a network of transmitters, the method comprising:
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identifying a set of transmitters from the network of transmitters; using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters; determining, for each group of the three or more groups, a number of transmitters included in that group; for each group of the three or more groups that includes a number of transmitters that is less than an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two; for each group of the three or more groups that includes a number of transmitters that is equal to or greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and determining, using at least one processor, an estimated position of the receiver using all of the identified range measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for estimating a position of a receiver using a network of transmitters, the method comprising:
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identifying a set of transmitters from the network of transmitters; using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters; determining, for each group of the three or more groups, a number of transmitters included in that group; for each group of the three or more groups that includes a number of transmitters that is less than or equal to an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two; for each group of the three or more groups that includes a number of transmitters that is greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and determining, using at least one processor, an estimated position of the receiver using all of the identified range measurements. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. One or more non-transitory processor-readable media embodying program instructions that, when executed by one or more processors, cause the one or more processors to implement a method for estimating a position of a receiver using a network of transmitters, the method comprising:
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identifying a set of transmitters from the network of transmitters; using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters; determining, for each group of the three or more groups, a number of transmitters included in that group; for each group of the three or more groups that includes a number of transmitters that is less than an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two; for each group of the three or more groups that includes a number of transmitters that is equal to or greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and determining an estimated position of the receiver using all of the identified range measurements. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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20. One or more non-transitory processor-readable media embodying program instructions that, when executed by one or more processors, cause the one or more processors to implement a method for estimating a position of a receiver using a network of transmitters, the method comprising:
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identifying a set of transmitters from the network of transmitters; using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters; determining, for each group of the three or more groups, a number of transmitters included in that group; for each group of the three or more groups that includes a number of transmitters that is less than or equal to an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two; for each group of the three or more groups that includes a number of transmitters that is greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and determining an estimated position of the receiver using all of the identified range measurements. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification