System and method for localization and tracking
First Claim
1. A localization system comprising:
- a memory manager to load data values indicative of a satellite signal being blocked at one or more locations into a cache; and
a non-linear filter, including one or more processors, to;
receive from a user device a first position estimate and a signal strength data associated with at least one satellite; and
generate a second position estimate based on the first position estimate, the signal strength data, and the stored data values indicative of the at least one satellite being blocked at one or more locations;
wherein the data values indicative of a satellite signal being blocked at one or more locations is comprised of a plurality of quantized ephemeris bins that represent possible locations of each of the plurality of satellites, wherein each quantized ephemeris bin includes probabilities of the satellite being blocked with respect to each of the plurality of possible locations.
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Abstract
A method of determining location of a user device includes receiving global navigation satellite system (GNSS) fix data that represents GNSS calculated position of the user device, receiving signal strength data associated with each satellite communicating with the user device, and receiving satellite data regarding locations of satellites. The method further includes retrieving satellite blocking values from a cache that describe a likelihood of a satellite signal being blocked at a plurality of possible locations. A non-linear filter, implemented by one or more processors, is applied to the GNSS fix data, signal strength data, and satellite blocking values to generate an updated position estimate of the user device.
36 Citations
20 Claims
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1. A localization system comprising:
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a memory manager to load data values indicative of a satellite signal being blocked at one or more locations into a cache; and a non-linear filter, including one or more processors, to; receive from a user device a first position estimate and a signal strength data associated with at least one satellite; and generate a second position estimate based on the first position estimate, the signal strength data, and the stored data values indicative of the at least one satellite being blocked at one or more locations; wherein the data values indicative of a satellite signal being blocked at one or more locations is comprised of a plurality of quantized ephemeris bins that represent possible locations of each of the plurality of satellites, wherein each quantized ephemeris bin includes probabilities of the satellite being blocked with respect to each of the plurality of possible locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A localization system comprising:
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a memory manager to load data values indicative of a satellite signal being blocked at one or more locations into a cache; and a non-linear filter, including one or more processors, to; receive from a user device a first position estimate and a signal strength data associated with at least one satellite; and generate a second position estimate based on the first position estimate, the signal strength data, and the stored data values indicative of the at least one satellite being blocked at one or more locations; wherein the SNR model utilizes first order reflections to further refine the likelihood of a particle being located at a particular position; and wherein the measured signal strength is identified as a first-order reflection in response to the measured signal strength exceeding a threshold and in response to the data value indicative of a satellite signal being blocked indicating a high likelihood that the satellite signal between the plurality of possible locations and the satellite are blocked.
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10. A method of determining location of a user device, the method comprising:
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receiving global navigation satellite system (GNSS) fix data that represents GNSS calculated position of the user device; receiving signal strength data associated with each satellite communicating with the user device; receiving satellite data regarding locations of satellites; retrieving satellite blocking values from a cache that describe a likelihood of a satellite signal being blocked at a plurality of possible locations; and applying, by one or more processors, a non-linear filter to the GNSS fix data, signal strength data, and satellite blocking values to generate an updated position estimate of the user device; wherein the cache is comprised of a plurality of quantized ephemeris bins that represent possible locations of each of the plurality of satellites, wherein each quantized ephemeris bin includes probabilities of the satellite being blocked with respect to each of the plurality of particles. - View Dependent Claims (11, 12)
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13. A method of determining location of a user device, the method comprising:
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receiving global navigation satellite system (GNSS) fix data that represents GNSS calculated position of the user device; receiving signal strength data associated with each satellite communicating with the user device; receiving satellite data regarding locations of satellites; retrieving satellite blocking values from a cache that describe a likelihood of a satellite signal being blocked at a plurality of possible locations; and applying, by one or more processors, a non-linear filter to the GNSS fix data, signal strength data, and satellite blocking values to generate an updated position estimate of the user device; wherein the SNR model utilizes first order reflections to further refine the likelihood of a particle being located at a particular position; and wherein the measured signal strength is identified as a first-order reflection in response to the measured signal strength exceeding a threshold and in response to the satellite blocking values indicating a high likelihood that the satellite signal between the plurality of possible locations and the satellite are blocked.
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14. A method of determining location of a user device, the method comprising:
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receiving global navigation satellite system (GNSS) fix data that represents GNSS calculated position of the user device; receiving signal strength data associated with each satellite communicating with the user device; receiving satellite data regarding locations of satellites; and applying, by one or more processors, a non-linear filter to the GNSS fix data and signal strength data to generate an updated position estimate of the user device, wherein the non-linear filter utilizes a signal-to-noise ratio (SNR) model to assign weights to each of a plurality of particles representing possible user device locations included in a particle set based on calculated likelihoods of satellite signals being blocked at each of the plurality of particles and the received signal strength data, wherein the SNR model utilizes first order reflections to further refine the likelihood of a particle being located at a particular position. - View Dependent Claims (15, 16, 17)
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18. A computer readable medium containing program instructions for determining location of a user device, wherein execution of the program instructions by one or more processors of a computer system causes the one or more processors to carry out the steps of:
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receiving global navigation satellite system (GNSS) fix data that represents GNSS calculated position of the user device; receiving signal strength data associated with each satellite communicating with the user device; receiving satellite data regarding locations of satellites; retrieving satellite blocking values from a cache that describe a probability of a satellite signal being blocked at a plurality of possible locations; and applying, by one or more processors, a non-linear filter to the GNSS fix data, signal strength data, and shadow matching data to generate an updated position estimate of the user device, wherein the cache is comprised of a plurality of quantized ephemeris bins that represent possible locations of each of the plurality of satellites, wherein each quantized ephemeris bin includes probabilities of the satellite being blocked with respect to each of the plurality of particles. - View Dependent Claims (19, 20)
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Specification