Mazen M. Shihabi

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The Mars Science Laboratory (MSL) mission landed the Curiosity Rover on the surface of Mars on August 6, 2012, beginning a one-Martian-year primary science mission. An international network of Mars relay orbiters, including NASA's 2001 Mars Odyssey Orbiter (ODY) and Mars Reconnaissance Orbiter (MRO), and ESA's Mars Express Orbiter (MEX), were positioned to(More)
The Mars Science Laboratory (MSL) mission landed the Curiosity Rover on the surface of Mars on August 6, 2012, beginning a one Martian year primary science mission. The UHF relay link from Curiosity to the Mars Reconnaissance Orbiter (MRO) incorporates new features enabled by the Electra and Electra-Lite software-defined radios on MRO and Curiosity,(More)
This paper describes a Carrier Aiding technique which employs cascaded pha.se-lockcd loops. This scheme can be useful when two unequal antennas are required to coherently demodulate the received signal, but due to an extremely weak signal-to-ratio. (SN R) level and high Doppler rates, the snlaller antenna is unable to lock on the carrier on its own. In(More)
This paper describes how SpaceWire Time Codes can be used for synchronizing time within various subsystems of a spacecraft as well as, maintaining a common time reference needed for coordinating operations within a spacecraft. The algorithms to account for inaccuracies in the time distribution method were based on the NASA-4009 Space Telecommunication Radio(More)
A compact set of tools have evolved for engineering analysis of Mars UHF relay telecommunications performance at NASA's Jet Propulsion Laboratory. The tools model all telecom variables from the RF layer up through the protocol link layer. The tools can solve for point solutions, analyze dynamic performance based on link geometry and can generate a variety(More)
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