Method and apparatus for processing satellite signals at a satellite positioning system receiver
First Claim
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1. A signal processing method for processing satellite signals in a satellite positioning system (SPS) receiver, comprising:
- correlating the satellite signals against pseudorandom reference codes to produce correlation results;
detecting whether the SPS receiver is in a motion condition or a stationary condition;
coherently integrating the correlation results in accordance with a coherent integration period, where a value of the coherent integration period depends on the movement of the SPS receiver; and
wherein the coherent integration period being a first value if the SPS receiver is in the stationary condition, or a second value if the SPS receiver is in the motion condition, wherein the second value of the coherent integration period is less than the epoch of the pseudorandom code, wherein the first value is larger than the second value.
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Abstract
Method and apparatus for processing satellite signals in an SPS receiver is described. In one example, the satellite signals are correlated against pseudorandom reference codes to produce correlation results. A determination is made whether the SPS receiver is in a motion condition or a stationary condition. The correlation results are coherently integrated in accordance with a coherent integration period. The coherent integration period is a value that depends upon the motion condition of the SPS receiver.
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Citations
14 Claims
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1. A signal processing method for processing satellite signals in a satellite positioning system (SPS) receiver, comprising:
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correlating the satellite signals against pseudorandom reference codes to produce correlation results; detecting whether the SPS receiver is in a motion condition or a stationary condition; coherently integrating the correlation results in accordance with a coherent integration period, where a value of the coherent integration period depends on the movement of the SPS receiver; and wherein the coherent integration period being a first value if the SPS receiver is in the stationary condition, or a second value if the SPS receiver is in the motion condition, wherein the second value of the coherent integration period is less than the epoch of the pseudorandom code, wherein the first value is larger than the second value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal processing apparatus for processing satellite signals in a satellite positioning system (SPS) receiver, comprising:
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a correlator for correlating the satellite signals against pseudorandom reference codes to produce correlation results; a motion detection module for detecting whether the SPS receiver is in a motion condition or a stationary condition; integration circuits for coherently integrating the correlation results in accordance with a coherent integration period; and control logic for setting the coherent integration period to a value that depends on the movement of the SPS receiver, wherein the motion detection module is configured to compute a difference between a maximum of a plurality of timing advance values and a minimum of the plurality of timing advance values, where the stationary condition is detected in response to the difference being less than a predetermined threshold, and the motion condition is detected in response to the difference being more than the predetermined threshold. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification