Unbiased code phase discriminator

Details Unbiased code phase discriminator Unbiased code phase discriminator

2011-08-16

2011-08-16

Flores, Leon (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S142000, C375S147000, C375S316000, C375S340000, C375S343000, C342S352000, C342S357490, C342S357490

Reexamination Certificate

active

08000381

ABSTRACT:
A feedback control law steers a reference phase that tracks the phase of a received code sequence. The reference phase clocks a track-reference signal consisting of a series of correlation kernels, over which data is extracted and then summed in various combinations. The correlation kernels are designed in such a manner that errors caused by multipath are eliminated or substantially reduced. Furthermore, the areas of the correlation kernels are balanced across level-transitions of a code and non-transitions to eliminate phase biases when tracking specific satellites. Extra care must be taken to balance the correlation kernels in this manner due to a little known aspect of GPS C/A codes. Specifically, not all C/A codes have the same ratio of level-transitions to non-transitions as has been assumed in prior art.

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