2007 IEEE Aerospace Conference 2007
DOI: 10.1109/aero.2007.352895
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MRO Ka-band Demonstration: Cruise Phase Lessons Learned

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Cited by 10 publications
(9 citation statements)
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“…As seen from this figure, the actual G/T is less than the required G/T for 99% MAR by more than 8 dB between 1100 and 1200 UTC. Such large drops in G/T occur more often at Ka-band than at X-band because the drops in G/T for Ka-band due to weather are roughly four times greater in dB than those for X-band [5]. Therefore, for Ka-band, a simple margin policy cannot be employed to insure completeness of the data and automated retransmission schemes have to be used.…”
Section: Resultsmentioning
confidence: 89%
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“…As seen from this figure, the actual G/T is less than the required G/T for 99% MAR by more than 8 dB between 1100 and 1200 UTC. Such large drops in G/T occur more often at Ka-band than at X-band because the drops in G/T for Ka-band due to weather are roughly four times greater in dB than those for X-band [5]. Therefore, for Ka-band, a simple margin policy cannot be employed to insure completeness of the data and automated retransmission schemes have to be used.…”
Section: Resultsmentioning
confidence: 89%
“…During MRO cruise phase, the functionality of this suite was fully verified and some limited Ka-band performance data were obtained [5] [6]. However, on May 24, 2006, during aerobraking in Mars orbit, MRO's primary Ka-band chain failed.…”
Section: Introductionmentioning
confidence: 99%
“…Its main features are the ability (a) to produce phase-aligned signals at a distant target without external calibration, and (b) to use a downlink signal (if one is simultaneously present) to measure the effects of tropospheric turbulence along the signal paths and apply real-time corrections to the uplink signal. The effects of tropospheric turbulence increase in proportion to signal frequency, as do the effects of errors in the instrumentation 28,29 , making the KaBOOM demonstration particularly challenging.…”
Section: The Demonstration Projectmentioning
confidence: 99%
“…In ODY, the telemetry signal is encoded with two codes, a Reed-Solomon (255, 223) as the outer code and a (7, 1/2) convolutional code as the inner code [12]. In MRO, three different coding types are available [5], [13]: a) (255, 223) Reed-Solomon block code with interleaving depth of either 5 or 1, b) (255, 223) Reed-Solomon and a (7, 1/2) convolutional code with interleaving depth of 5, and c) turbo codes with block length 8920 bits and rates 1/2, 1/3, and 1/6.…”
Section: A Protocol Stack: Raptorq Codes Over Turbo Codesmentioning
confidence: 99%
“…Instead, the standard method is to perform background sequencing in which the spacecraft is commanded once every four weeks to reconfigure its transmission parameters. The use of mini-sequencing to vary telecommunication parameters such as modulation index and data rate profile parameters of distant spacecraft on a weekly basis for Ka-band demonstration was introduced with the MRO [4], [5].…”
mentioning
confidence: 99%