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- W2949844799 abstract "When attempting to land on a planetary body, perform a complex direction change, or even while simply cruising, challenges arise in spacecraft to Earth communications. If a spacecraft must perform a complicated maneuver such as orbit insertion, the spacecraft often cannot use its High Gain Antenna (HGA) for communication to another craft, or back to Earth. Additionally, if the spacecraft enters a fault state, it is possible that the antennas cannot be oriented as precisely. In these scenarios, a Low Gain Antenna (LGA) may be used to communicate limited information to know that the spacecraft is alive in the former situation, and to recover the spacecraft in the latter situation, so it is imperative to use communication methods that have a high probability of correctly obtaining a weak signal. This study will first summarize the mechanism to predict the probability of successfully detecting the carrier frequency and data tones used in Multiple Frequency-Shift Keying (MFSK, or tones) by the spacecraft, and then explore the applicability of MFSK in future missions for events including but not limited to orbit insertion; entry, decent, and landing (EDL); and safe modes. Using the search space, non-coherent integration time, fast Fourier Transform (FFT) bandwidth, and modulation index, one may compute the predicted probability of correctly detecting and tracking a frequency versus the total power to noise ratio. Tones allowed for communication with planetary landers and other spacecraft in the past, namely the Mars Exploration Rover (MER), Mars Science Laboratory (MSL), both primarily for EDL, and Juno for orbit insertion. Following the models outlined in [1], we demonstrate the probability of properly detecting a tone during JOI to be greater than 99% under worst-case expected operating conditions for the Europa Clipper mission. We also examine the optimal use of tones during other spacecraft critical events, such Europa Clipper's safe mode recovery via examination of parameter modifications to MFSK as used in Juno, MER, and MSL, and comparing how these modifications perform compared to the original technique." @default.
- W2949844799 created "2019-06-27" @default.
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- W2949844799 date "2019-03-01" @default.
- W2949844799 modified "2023-10-02" @default.
- W2949844799 title "Optimizing Multiple Frequency-Shift Keying During Spacecraft Critical Events for Future Missions" @default.
- W2949844799 cites W2049792783 @default.
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- W2949844799 doi "https://doi.org/10.1109/aero.2019.8742189" @default.
- W2949844799 hasPublicationYear "2019" @default.
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