Doppler tracking of planetary spacecraft
| Autor: | P.W. Kinman |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Physics
Radiation Observational error Spacecraft business.industry Acoustics NASA Deep Space Network Microwave transmission Condensed Matter Physics Noise (electronics) Phase-locked loop symbols.namesake Physics::Space Physics symbols Electrical and Electronic Engineering business Doppler effect Remote sensing Transponder |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 40:1199-1204 |
| ISSN: | 0018-9480 |
| Popis: | The measurement of Doppler shift on microwave links that connect planetary spacecraft with the Deep Space Network is described. Such measurements are made by tracking the Doppler effect with phase-locked loop receivers. A description of equipment and techniques as well as a summary of the appropriate mathematical models are given. The two-way Doppler shift is measured by transmitting a highly stable microwave (uplink) carrier from a ground station, having the spacecraft coherently transpond this carrier, and using a phase-locked loop receiver at the ground station to track the returned (downlink) carrier. The largest sources of measurement error are usually plasma noise and thermal noise. The plasma noise, which may originate in the ionosphere or the solar corona, is discussed; and a technique to partially calibrate its effect, involving the use of two simultaneous downlink carriers that are coherently related, is described. Range measurements employing Doppler rate-aiding are also described. > |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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