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Improved carrier tracking performance with coupled phase-locked loops

机译:通过耦合锁相环改善载波跟踪性能

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A carrier arraying system to combine the received carrier signals at geographically separated receivers with different carrier phases to improve carrier tracking performance is considered. This system basically couples several phase-locked loops to enhance received carrier signal-to-noise ratio. There is no extra alignment of carrier phases. This system automatically aligns the carrier phases, which results in coherent combining of the carrier signals. The tracking performance of this carrier arraying system are analyzed by assessing its rms phase jitter and radio loss. Carrier arraying alone will not provide any improvement in bit energy to noise spectral density ratio. However, carrier arraying provides reduction in radio loss with respect to the no carrier arraying case. Results were extended to the case of combined carrier and baseband arraying. Bit error rates and radio loss curves are given. Numerical results are given for three useful cases, namely, the array of 64/34, the array of 64/34/34 and the array of 64/34/34 meter-antenna stations of the NASA Deep Space Network.

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