Method and apparatus for providing an energy-based signal tracking loop
First Claim
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1. A method of tracking a signal comprising:
- (a) correlating, based on a hypothesis, a digital signal with a code at a plurality of frequencies and at least one delay to produce correlation results;
(b) measuring an energy value of the correlation results; and
(c) adjusting at least one of the frequency or delay in response to the measured energy value; and
wherein the energy value is a measured energy vector comprising measured quantities of a frequency and a delay; and
wherein the measured quantities are used to update states of an extended Kalman filter.
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Abstract
A method and apparatus for tracking a signal comprises correlating a digital signal with a code using a hypothesis at a plurality of frequencies and at least one delay to produce correlation results, measuring an energy value of the correlation results, adjusting at least one of the frequency or delay in response to the measured energy value to form the hypothesis.
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Citations
31 Claims
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1. A method of tracking a signal comprising:
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(a) correlating, based on a hypothesis, a digital signal with a code at a plurality of frequencies and at least one delay to produce correlation results; (b) measuring an energy value of the correlation results; and (c) adjusting at least one of the frequency or delay in response to the measured energy value; and wherein the energy value is a measured energy vector comprising measured quantities of a frequency and a delay; and wherein the measured quantities are used to update states of an extended Kalman filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 23, 26, 29)
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10. A method of tracking a signal comprising:
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(a) correlating, based on a hypothesis, a digital signal with a code at a plurality of frequencies and at least one delay to produce correlation results; (b) producing a measured energy value of the correlation results; and (c) updating a frequency, and delay states of an extended Kalman filter in response to the measured energy value. - View Dependent Claims (11, 12, 13, 14, 15, 24, 27, 30)
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16. Apparatus for tracking a signal comprising:
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(a) a plurality of correlators for correlating, based on a hypothesis, a digital signal with a code at a plurality of frequencies and at least one delay to produce correlation results; (b) a discriminator for measuring an energy value of the correlation results; (c) an extended Kalman filter, wherein the frequency, and delay states of the extended Kalman filter are updated in response to the measured energy value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 25, 28, 31)
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Specification