Method for determining a change in a communication signal and using this information to improve SPS signal reception and processing
First Claim
1. A method of determining a Doppler search window for acquiring a satellite positioning system signal by a mobile communication device, the method comprising:
- receiving a cellular communication signal;
determining a change in the received cellular communication signal resulting from motion of the mobile communication device;
converting the change in the received cellular communication signal to approximate motion information;
determining the Doppler search window based on the approximate motion information; and
acquiring a satellite positioning system signal by a mobile communication device using the said Doppler search window.
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Accused Products
Abstract
Methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver which is coupled to a communication receiver or transceiver. In one exemplary method, a change in a communication signal received by the communication receiver is determined. A parameter, based on the change, is determined, and SPS signals from SPS satellites are processed according to the parameter. According to further details of this method, the change involves the fluctuation of the level of the communication signal and the parameter is a motion information which specifies a frequency range for searching for SPS signals in the process of acquiring the SPS signals from SPS satellites. In an alternative embodiment the change in the communication signal is a change in the transmitted signal in response to power control commands. Apparatuses, such as a mobile communication system which includes an SPS receiver and a communication receiver, are also described.
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Citations
7 Claims
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1. A method of determining a Doppler search window for acquiring a satellite positioning system signal by a mobile communication device, the method comprising:
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receiving a cellular communication signal; determining a change in the received cellular communication signal resulting from motion of the mobile communication device; converting the change in the received cellular communication signal to approximate motion information; determining the Doppler search window based on the approximate motion information; and acquiring a satellite positioning system signal by a mobile communication device using the said Doppler search window. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification