Method and apparatus for decoding satellite navigation data from a satellite positioning system
First Claim
1. A method of decoding a navigation message broadcast by a satellite positioning system satellites, said method comprising:
- receiving a subframe at a circuit, wherein the sub-frame and a plurality of other sub-frames form a portion of a frame, and wherein the subframe comprises a plurality of data words;
attempting validation of each of the plurality of data words;
retaining a portion of the plurality of data words in the subframe that are validated;
receiving a recurrence of the subframe;
attempting validation of a portion of the words in the recurring subframe that correspond to a portion of words in the subframe that were not validated when the subframe was previously received;
retaining ones of the portion of the words in the recurring subframe that are validated that correspond to the portion of the words in the subframe that were not validated when the subframe was previously received; and
assembling the subframe with the portion of the plurality of data words that are validated from the subframe and the ones of the portion of the words in the recurring subframe that are validated that correspond to the portion of the words in the subframe that were not validated when the subframe was previously received.
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Abstract
Method and apparatus for decoding a bitstream of navigation data broadcast by a satellite positioning system satellite is described. In one example, a portion of a subframe in the navigation data for each of a plurality of occurrences of the subframe in the bitstream is obtained at a satellite signal receiver to produce a respective plurality of subframe portions. The subframe portions are then combined to recover the subframe. The subframe portions may be processed to maintain a constant polarity by comparing a common sequence of data bits among at least two of the subframe portions to identify a mismatch in polarity.
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Citations
14 Claims
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1. A method of decoding a navigation message broadcast by a satellite positioning system satellites, said method comprising:
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receiving a subframe at a circuit, wherein the sub-frame and a plurality of other sub-frames form a portion of a frame, and wherein the subframe comprises a plurality of data words; attempting validation of each of the plurality of data words; retaining a portion of the plurality of data words in the subframe that are validated; receiving a recurrence of the subframe; attempting validation of a portion of the words in the recurring subframe that correspond to a portion of words in the subframe that were not validated when the subframe was previously received; retaining ones of the portion of the words in the recurring subframe that are validated that correspond to the portion of the words in the subframe that were not validated when the subframe was previously received; and assembling the subframe with the portion of the plurality of data words that are validated from the subframe and the ones of the portion of the words in the recurring subframe that are validated that correspond to the portion of the words in the subframe that were not validated when the subframe was previously received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification