Triple multiplexing spread spectrum receiver
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Abstract
A spread spectrum receiver processes signals from a plurality of sources modulated by different spread spectrum codes by sampling the signals as received to produce an integer series of sampling segments at a sampling rate at least twice a chip rate of the codes, each sampling segment containing an integer number of bits representing a fraction of a chip of the codes, time division multiplexing each sample segment into a number of channels, correlating the bits in each sample segment in each channel in parallel with a source specific series of locally generated sequential code samples differing by one bit, summing each parallel correlation, and accumulating the summed parallel correlations for each code sample in each channel at a rate at least equal to the chip rate to derive data related to each of the sources.
9 Citations
18 Claims
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1-17. -17. (canceled)
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18. A method for navigating a vehicle using satellite C/A code signals, comprising:
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using a first mode of navigation comprising a C/A code signal from a single satellite and cross-track hold data; and
using a second mode of navigation comprising updating satellite-derived data with data derived from detecting turns of the vehicle, wherein the first and second modes include correlating first sets of code sample segments against first sets of generated code delays.
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Specification