Citation
Abstract
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 (PLLs) to enhance received carrier signal-to-noise ratio. There is no extra alignment of carrier phases. This spstem automatically aligns the carrier phases, which results in coherent combining of the carrier signals, This article analyzes the tracking performance of this carrier arraying system 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 (for high carrier loop SNR). However, carrier arraying provides reduction in radio loss with respect to the no carrier arraying case. Results have been 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 64/34/34/34-meter-antenna stations of the NASA Deep Space Network (DSN).
Details
- Volume
- 42-66
- Published
- December 15, 1981
- Pages
- 148–171
- File Size
- 979.0 KB