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Adaptation of the Electra Radio to Support Multiple Receive ChannelsProposed future Mars missions plan communication between multiple assets (rovers). This paper presents the results of a study carried out to assess the potential adaptation of the Electra radio to a multi-channel transceiver. The basic concept is a Frequency Division multiplexing (FDM) communications scheme wherein different receiver architectures are examined. Options considered include: (1) multiple IF slices, A/D and FPGAs each programmed with an Electra baseband modem; (2) common IF but multiple A/Ds and FPGAs and (3) common IF, single A/D and single or multiple FPGAs programmed to accommodate the FDM signals. These options represent the usual tradeoff between analog and digital complexity. Given the space application, a common IF is preferable; however, multiple users present dynamic range challenges (e.g., near-far constraints) that would favor multiple IF slices (Option 1). Vice versa, with a common IF and multiple A/Ds (Option 2), individual AGC control of the A/Ds would be an important consideration. Option 3 would require a common AGC control strategy and would entail multiple digital down conversion paths within the FPGA. In this paper, both FDM parameters as well as the different Electra design options will be examined. In particular, signal channel spacing as a function of user data rates and transmit powers will be evaluated. In addition, tradeoffs between the different Electra design options will be presented with the ultimate goal of defining an augmented Electra radio architecture for potential future missions.
Document ID
20150008831
Document Type
Conference Paper
External Source(s)
Authors
Satorius, Edgar H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shah, Biren N. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bruvold, Kristoffer N. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bell, David J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 26, 2015
Publication Date
March 5, 2011
Subject Category
Space Communications, Spacecraft Communications, Command and Tracking
Meeting Information
IEEE Aerospace Conference(Big Sky, MT)
Distribution Limits
Public
Copyright
Other
Keywords
Time Division multiplexing
Frequency Division multiplexing
data throughput