| Autor: |
Todd Pedersen, Todd K. Moon, Jake Gunther, Todd Parris, Charles Swenson, Donald C. Thompson, Chad Fish |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
ICASSP |
| Popis: |
Digital down-conversion in software defined radios in space-to-Earth and Earth-to-space communications is challenging due to potentially large Doppler frequency offsets. The predictability of satellite orbits suggests that a computed Doppler offset could be used to perform an orbit-informed down-conversion. However, publicly available orbital parameters and orbit propagator codes lack the accuracy required for fine Doppler removal. This paper proposes a technique to adjust the orbital parameters until the computed Doppler profile matches the Doppler profile in the received signal. This technique is applied to a real signal recorded from a satellite overpass and is shown to be able to very accurately estimate frequency offsets. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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