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L1 / l2 - code - frequency band for global positioning system receivers - - -
L1 / l2 - code - frequency band for global positioning system receivers - - -
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机译：L1 / l2-代码-全球定位系统接收机的频段---
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摘要
An enhanced P-code channel (60) for use in a GPS receiver (10) to simultaneously track L1 and L2 comprises a P-code clock generator (62) for generating two code clocks. The first code clock associates with L1 and the second associates with L2. The code clocks have the same frequency but different phases from one another. Circuitry (64) and (66) generate and store a plurality of P-code chips. A first circuit (68, 70) selects and updates P-code chips from the stored P-code chips that are in phase with the L1 code clock. A second circuit (72 and 74) selects and updates P-code chips from the P-code chips and phased with the L2 code clock.
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