Correction of code drift in a non-coherent memory

A Doppler correction circuit that corrects for code drift in a non-coherent memory of pseudorandom noise receiver, where the non-coherent memory stores non-coherent accumulations of correlation in elements of the non-coherent memory, the Doppler correction circuit comprising:

• means for receiving a time index signal, where the time index signal relates to addresses of elements of the non-coherent memory;
• means for receiving an offset signal, where the offset signal is approximately related to an inverse of a product of a frequency computation associated with the non-coherent memory and a number of elements per code chip;
• means for applying the time index signal to the time offset signal to generate a compensated signal;
• means for applying the compensated signal to the non-coherent memory to retrieve a first accumulation;
• means for summing the first accumulation with a sample to generate a second accumulation;
• and
• means for storing the second accumulation in the non-coherent memory.

A synchronizing circuit that compensates for code drift over time in at least a portion of a non-coherent integration memory, the synchronizing circuit comprising:

• an offset occurrence circuit adapted to receive a clock signal and to provide an indication with a period related to an inverse of a product of a frequency computation associated with the at least portion of the non-coherent integration memory;
• a counter circuit adapted to accumulate indications provided by the offset occurrence circuit, where an output of the counter circuit is termed a time offset signal;
• and
• an adder circuit adapted to sum a time index signal with the time offset signal, where the time index signal relates to a memory address with no code drift, where an output of the adder circuit is applied to the address of the non-coherent integration memory such that a memory location indicated by the output of the adder circuit is synchronized with the code.