System and method for frequency management in a communications positioning device
First Claim
1. A system for generating a frequency reference in a hybrid communications device, comprising:
- a clock source generating a clock signal at a base frequency;
a communications receiver, the communications receiver performing communications processing based on an input of the clock signal at the base frequency, the communications receiver generating frequency tracking data;
a positioning receiver, the positioning receiver performing positioning processing based on an input of the clock signal at the base frequency; and
a processor, the processor communicating with the communications receiver and the positioning receiver, the processor transmitting a control message to the positioning receiver to adapt positioning processing based on the frequency tracking data.
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Accused Products
Abstract
A frequency management scheme for a hybrid communications/positioning device, such as a cellular/GPS or other combined device, generates a local clock signal for the communications portion of the device, using a crystal oscillator or other part. The oscillator output may be delivered to a phase locked loop to drive a high-frequency clock for the cellular or other communications portion of the hybrid device. A processor may determine frequency error between the phase locked loop and base station or other reference, to derive a digital frequency tracking message. A Doppler search or other logical control message may likewise be communicated from the processor to a GPS or other positioning receiver. The GPS receiver circuitry may consequently adjust Doppler center, window width or other parameters to enhance time to first fix or other performance. The architecture eliminates the need for a second crystal or other direct oscillator in the GPS receiver portion of the hybrid device, while still maintaining GPS performance. The architecture of the design also eliminates the need for frequency correcting elements in the crystal oscillator or other base reference oscillator or clock. The invention can furthermore be used in any system, radio, modem, transceiver, or receiver that has two or more receivers that share one reference or base oscillator or clock.
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Citations
55 Claims
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1. A system for generating a frequency reference in a hybrid communications device, comprising:
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a clock source generating a clock signal at a base frequency;
a communications receiver, the communications receiver performing communications processing based on an input of the clock signal at the base frequency, the communications receiver generating frequency tracking data;
a positioning receiver, the positioning receiver performing positioning processing based on an input of the clock signal at the base frequency; and
a processor, the processor communicating with the communications receiver and the positioning receiver, the processor transmitting a control message to the positioning receiver to adapt positioning processing based on the frequency tracking data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for generating a frequency reference in a hybrid communications device, comprising:
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generating a clock signal at a base frequency;
performing communications processing in a communications receiver based on an input of the clock signal at the base frequency;
generating frequency tracking data in the communications receiver;
performing positioning processing in a positioning receiver based on an input of the clock signal at the base frequency; and
transmitting a control message to the positioning receiver to adapt positioning processing based on the frequency tracking data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for generating a frequency reference in a hybrid communications device, comprising:
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clock source means for generating a clock signal at a base frequency;
communications receiver means, the communications receiver means for performing communications processing based on an input of the clock signal at the base frequency, the communications receiver means generating frequency tracking data;
positioning receiver means, the positioning receiver means for performing positioning processing based on an input of the clock signal at the base frequency; and
processor means, the processor means communicating with the communications receiver means and the positioning receiver means, the processor means for transmitting a control message to the positioning receiver means to adapt positioning processing based on the frequency tracking data. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A system, comprising:
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at least two signal receiving elements;
a base oscillator, the base oscillator generating a clock signal at a base frequency to communicate to the at least two signal receiving elements; and
a processor, the processor communicating with the at least two signal receiving elements, acquiring frequency tracking data from a first signal receiving element among the at least two signal receiving elements, and generating a control message to enhance the performance of at least one of the remaining signal receiving elements based on the frequency tracking data. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification