Digital Doppler measurement with spacecraft
| Autor: | H. M. Del Castillo, Sami M. Hinedi, P.W. Kinman, R.C. LaBelle, D.C. Chong, Roland P. Bevan |
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| Rok vydání: | 1991 |
| Předmět: |
Engineering
Spacecraft business.industry Acoustics Instantaneous phase Residual carrier Phase-locked loop symbols.namesake Transponder (satellite communications) Telecommunications link Electronic engineering symbols Electrical and Electronic Engineering business Instrumentation Doppler effect Computer Science::Information Theory Jitter |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 40:727-731 |
| ISSN: | 0018-9456 |
| DOI: | 10.1109/19.85342 |
| Popis: | Digital and analog phase-locked loop (PLL) receivers were operated in parallel, each tracking the residual carrier from a spacecraft. The PLL tracked the downlink carrier and measured its instantaneous phase. This information, combined with a knowledge of the uplink carrier and the transponder ratio, permitted the computation of a Doppler observable. In this way, two separate Doppler measurements were obtained for one observation window. The two receivers agreed on the magnitude of the Doppler effect to within 1 mHz. There was less jitter on the data from the digital receiver. This was due to its smaller noise bandwidth. The demonstration and its results are described. > |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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