Patent ID: 7924947
Filing Date: 2011-04-12
Classification: G01S

Abstract:
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.