METHODS AND SYSTEMS FOR STATIONARY USER DETECTION IN A HYBRID POSITIONING SYSTEM
First Claim
1. A method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals comprising:
- acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements;
acquiring a rough estimate of location of the satellite enabled device;
calculating an internal frequency offset of satellite enabled device;
adjusting the Doppler frequency measurements to account for satellite movement and the internal frequency offset to provide a device Doppler frequency; and
determining that the device is stationary if the device Doppler frequency is small.
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Abstract
This disclosure describes methods and systems for stationary user detection in a hybrid location system. In some embodiments, the method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals can include acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements, acquiring a rough estimate of location of the satellite enabled device and calculating an internal frequency offset of satellite enabled device.
201 Citations
14 Claims
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1. A method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals comprising:
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acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements; acquiring a rough estimate of location of the satellite enabled device; calculating an internal frequency offset of satellite enabled device; adjusting the Doppler frequency measurements to account for satellite movement and the internal frequency offset to provide a device Doppler frequency; and determining that the device is stationary if the device Doppler frequency is small. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals comprising:
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a positioning module comprising; a satellite positioning module for obtaining satellite information from at least two different satellites, wherein the satellite measurements include Doppler frequency measurements; logic located in the satellite positioning module for adjusting the Doppler frequency measurements to account for satellite movement and frequency offset of satellite enabled device to provide a device Doppler frequency and determining that the device is stationary if the device Doppler frequency is small. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification