Method for determining A change in A communication signal and using this information to improve SPS signal reception and processing
First Claim
1. A mobile communication apparatus for acquiring a satellite positioning system signal, the apparatus comprising:
- means for receiving a cellular communication signal at the mobile communication apparatus;
a measurement unit that determines a change in the received cellular communication signal resulting from motion of the mobile communication apparatus and approximates motion information of the mobile communication apparatus in accordance with the determined change;
means for determining a Doppler search window about a predetermined signal frequency of the satellite positioning system signal based on the approximate motion information; and
means for acquiring the satellite positioning system signal at the mobile communication apparatus using 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
20 Claims
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1. A mobile communication apparatus for acquiring a satellite positioning system signal, the apparatus comprising:
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means for receiving a cellular communication signal at the mobile communication apparatus; a measurement unit that determines a change in the received cellular communication signal resulting from motion of the mobile communication apparatus and approximates motion information of the mobile communication apparatus in accordance with the determined change; means for determining a Doppler search window about a predetermined signal frequency of the satellite positioning system signal based on the approximate motion information; and means for acquiring the satellite positioning system signal at the mobile communication apparatus using said Doppler search window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable medium of a mobile communication apparatus including instructions stored thereon configured to cause a computer to acquire a satellite positioning system signal, the instructions comprising:
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instructions to determine a change in a received cellular communication signal resulting from motion of the mobile communication apparatus and determine approximate motion information in accordance with the determined change; instructions to determine a Doppler search window about a predetermined signal frequency of the satellite positioning system signal based on the approximate motion information; and instructions to acquire the satellite positioning system signal using said Doppler search window. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for acquiring a satellite positioning system signal in a mobile communication apparatus, the method comprising:
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receiving a cellular communication signal at the mobile communication apparatus; determining a change in the received cellular communication signal resulting from motion of the mobile communication apparatus and approximating motion information of the mobile communication apparatus in accordance with the determined change; determining a Doppler search window about a predetermined signal frequency of the satellite positioning system signal based on the approximate motion information; acquiring the satellite positioning system signal at the mobile communication apparatus using said Doppler search window.
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20. A mobile communication apparatus for acquiring a satellite positioning system signal, the apparatus comprising:
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a receiver configured to receive a cellular communication signal; a measurement unit communicatively coupled to the receiver and configured to determine a change in the received cellular communication signal resulting from motion of the mobile communication apparatus and approximate motion information of the mobile communication apparatus in accordance with the determined change; and a processor communicatively coupled to the measurement unit and configured to; determine a Doppler search window about a predetermined signal frequency of the satellite positioning system signal based on the approximate motion information; and acquire the satellite positioning system signal using said Doppler search window.
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Specification