Frequency phase correction system
First Claim
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1. A frequency phase correction system for use with a communication receiver utilizing a reference frequency signal, the frequency reference correction system comprising:
- a frequency error block configured to determine a frequency error of the reference frequency signal, one or more frequency characteristics of the reference frequency signal, and an estimate of the error in reference frequency signal at a time in the future; and
a frequency and time control block configured to adjust an operating frequency of the reference frequency signal to account for said estimate of the error in reference frequency signal.
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Abstract
A frequency phase correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.
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Citations
83 Claims
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1. A frequency phase correction system for use with a communication receiver utilizing a reference frequency signal, the frequency reference correction system comprising:
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a frequency error block configured to determine a frequency error of the reference frequency signal, one or more frequency characteristics of the reference frequency signal, and an estimate of the error in reference frequency signal at a time in the future; and
a frequency and time control block configured to adjust an operating frequency of the reference frequency signal to account for said estimate of the error in reference frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An aided location communication device (ALCD), comprising:
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a. a reference frequency oscillator providing a reference frequency signal, b. a communication section providing radio frequency communication with one or more communication devices;
c. a position determination section configured to determine position information of the ALCD based on one or more received radio frequency signals, and d. a frequency phase correction system configured to correlate the reference frequency signal with the one or more radio frequency signals received by the position determination section. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method for receiving wireless signals at a receiver utilizing a reference frequency signal, the method comprising:
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determining a frequency error of the reference frequency signal, determining one or more frequency characteristics of the reference frequency signal, determining an estimate of the error in reference frequency signal at a time in the future; and
adjusting an operating frequency of the reference frequency signal to account for said estimate of the error in reference frequency signal. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A system for receiving wireless signals at a receiver utilizing a reference frequency signal, the system comprising:
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means for determining a frequency error of the reference frequency signal, means for determining one or more frequency characteristics of the reference frequency signal, means for determining an estimate of the error in reference frequency signal at a time in the future; and
means for adjusting an operating frequency of the reference frequency signal to account for said estimate of the error in reference frequency signal. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83)
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Specification