System and method for enhanced data decode in a gps receiver

A method of decoding data bits from satellites of a satellite-based navigation system, comprising:

• predicting data bits for the satellites to form predicted data bits;
• reducing number of data bits to be decoded by using the predicted data bits;
• performing a plurality of differential phase decoding between a data bit to be decoded and a plurality of data bits surrounding the data bit to be decoded to form a decoded data bit;
• performing data parity checking and error correction on a data word comprising a plurality of predicted data bits and a plurality of decoded data bits to form equivalent parity checked and corrected data words for a plurality of frames;
• comparing the equivalent parity checked and corrected data words for the plurality of frames to form a decoded data word.

A data decoding system for a satellite-based navigation system comprising:

• a data prediction subsystem adapted to provide predicted data bits for a satellite;
• a differential data decoding subsystem adapted to provide decoded data bits from the satellite for data bits other than the predicted data bits;
• and
• a data parity check and correction subsystem adapted to perform parity check and to correct bit errors in the decoded data bits from the differential data decoding subsystem and the predicted data bits from the data prediction subsystem to provide a decoded data word for a frame;