POSITION DETERMINATION FOR A WIRELESS TERMINAL IN A HYBRID POSITION DETERMINATION SYSTEM
First Claim
1. A method comprising:
- at a mobile device, receiving signals from a first more accurate position determination sub-system;
generating information indicative of a position of the mobile device based on the signals received from the first more accurate position determination sub-system;
at a first time, receiving signals at the mobile device from at least a first transmitter included in a second less accurate position determination sub-system, wherein the first transmitter is located at an associated position;
at a different time, receiving signals at the mobile device from the first transmitter in response to selecting a position solution type using the second less accurate position determination sub-system;
accessing pseudeorange residual information for the first transmitter, wherein the pseudorange residual information for the first transmitter is derived from the information indicative of the position of the mobile device based on the signals received from the first more accurate position determination sub-system, the associated position of the first transmitter, and the signals received at the mobile device from the first transmitter at the first time; and
using the signals received at the mobile device from the first transmitter at the different time and the pseudorange residual information for the first transmitter to determine information indicative of the position of the mobile device at the different time.
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Accused Products
Abstract
Techniques to determine a position estimate for a wireless terminal. An accurate position estimate for the terminal is initially obtained (e.g., based on a first (accurate) position determination sub-system). For each of one or more transmitters (e.g., base stations) in a second (less accurate) position determination sub-system, an “expected” pseudo-range is computed based on the accurate position estimate for the terminal and the base station location, a “measured” pseudo-range is also obtained, and a pseudo-range residual is then determined based on the expected pseudo-range and the measured pseudo-range. Thereafter, to determine an updated position estimate for the terminal, measured pseudo-ranges are obtained for a sufficient number of transmitters. The measured pseudo-range for each base station may be corrected based on the associated residual. The updated position estimate is then determined based on the corrected pseudo-ranges for these transmitters.
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Citations
16 Claims
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1. A method comprising:
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at a mobile device, receiving signals from a first more accurate position determination sub-system; generating information indicative of a position of the mobile device based on the signals received from the first more accurate position determination sub-system; at a first time, receiving signals at the mobile device from at least a first transmitter included in a second less accurate position determination sub-system, wherein the first transmitter is located at an associated position; at a different time, receiving signals at the mobile device from the first transmitter in response to selecting a position solution type using the second less accurate position determination sub-system; accessing pseudeorange residual information for the first transmitter, wherein the pseudorange residual information for the first transmitter is derived from the information indicative of the position of the mobile device based on the signals received from the first more accurate position determination sub-system, the associated position of the first transmitter, and the signals received at the mobile device from the first transmitter at the first time; and using the signals received at the mobile device from the first transmitter at the different time and the pseudorange residual information for the first transmitter to determine information indicative of the position of the mobile device at the different time. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile device comprising:
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a satellite signal receiver including satellite processing circuitry to process received satellite signals to derive satellite information for position determination; a terrestrial signal receiver including terrestrial processing circuitry to process received terrestrial signals to derive terrestrial information for position determination; a controller to select a position solution type; wherein the mobile device is configured to; use the satellite processing circuitry to generate information indicative of a position of the mobile device based on satellite signals received at the satellite signal receiver; at a first time, receive signals at terrestrial signal receiver from at least a first terrestrial transmitter, wherein the first transmitter is located at an associated position; at a different time, receive signals at the mobile device from the first transmitter in response to controller selection of a position solution type using at least terrestrial positioning techniques; access pseudeorange residual information for the first transmitter, wherein the pseudorange residual information for the first transmitter is derived from the information indicative of the position of the mobile device based on satellite signals received at the satellite signal receiver, the associated position of the first transmitter, and the signals received at the mobile device from the first transmitter at the first time; and using the signals received at the mobile device from the first transmitter at the different time and the pseudorange residual information for the first transmitter to determine information indicative of the position of the mobile device at the different time. - View Dependent Claims (7, 8, 9, 10)
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11. A mobile device comprising:
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means for receiving signals from a first more accurate position determination sub-system at a mobile device; means for generating information indicative of a position of the mobile device based on the signals received from the first more accurate position determination sub-system; means for receiving signals at the mobile device from at least a first transmitter included in a second less accurate position determination sub-system at a first time, wherein the first transmitter is located at an associated position; means for receiving signals at the mobile device from the first transmitter at a different time, in response to selecting a position solution type using the second less accurate position determination sub-system; means for accessing pseudeorange residual information for the first transmitter, wherein the pseudorange residual information for the first transmitter is derived from the information indicative of the position of the mobile device based on the signals received from the first more accurate position determination sub-system, the associated position of the first transmitter, and the signals received at the mobile device from the first transmitter at the first time; and means for using the signals received at the mobile device from the first transmitter at the different time and the pseudorange residual information for the first transmitter to determine information indicative of the position of the mobile device at the different time. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification