Tapered coherent integration time for a receiver of a positioning system

A method for improved performance of a receiver used in conjunction with a positioning system, the method comprising:

• setting, at a duration determination module, a first duration for a first coherent integration time period for coherent integration of signals received from the positioning system at the receiver during the first coherent integration time period;
• modifying, with the duration determination module, the first duration of the coherent integration time period to a second duration for a second coherent integration time period for coherent integration of signals received from the positioning system at the receiver during the second coherent integration time period, wherein the modifying is in response to errors in the signals introduced at the receiver, and wherein the second duration is less than the first duration;
• generating a first coherent integration value from coherent integration of signals received from the positioning system at the receiver during the first coherent integration time period and a second coherent integration value from coherent integration of signals received from the positioning system at the receiver during the second coherent integration time period, wherein each respective coherent integration value is based on the magnitude of the integrated signals in each corresponding coherent integration time period;
• and
• non-coherently summing the first and second coherent integration values.