WA8LMF Mirror of WB4APR Website - 21 July 2008 PCsat
Naval-Academy EMI Space Integrated Sensor
Satellite Project
US Naval Academy Satellite Lab, Bob Bruninga, WB4APR

NEMISIS(sp) is a potential US Naval Academy Aerospace student project designed to give students real hands on experience in satellite design and operations. The NEMISIS(sp) will accomplish these objectives:

  • The obvious education of Midshipmen in all aspects of Aerospace Engineering
  • Development of our ability to design/construct CUBESAT type spacecraft
  • Provide a very broadband tunable EMI detection receiver
  • Support other missions needing a bent-pipe transponder

    NEMISIS(SP) OBJECTIVES: The objective of NEMISIS(sp) is to provide a very low cost Electromagnetic Interference detector on orbit that can be commanded to listen to any frequnecy in the electromagnetic spectrum from 1 MHz up to 1300 MHz. This tiny CUBEsat can help in the detection of harmful interference sources that affect satellite communications systems in the VHF and UHF ranges. This function is vital to both the Department of Defense (our launch provider) and the amateur satellite service which is increasingly experiencing terrestrial interference from unlicensed and un-coordinated emitters around the world. On our NEMISIS spacecraft, we will also be able to conduct other small experimental student experiments .

    NEMISIS Position Determination: NEMISIS(sp) will also be able to detect the NAVSPASUR Radar Fence to help us locate it in space. Its receiver can be tuned to hear the NAVSPASUR Doppler as it flies over the RADAR fence and the downlink audio will allow for position determination on the ground.

    CHALLENGES: The challenges to building NEMISIS(sp) are all hardware related. That being whether we can modify these off-the-shelf devices to the space environment and to autonomous fail safe operation.

  • Can we burn in factory defaults for the TH-D7 control links
  • Can we remotely control the TH-F6 tundable receiver
  • Can we write the PIC processor to accomplish all operations and resets
  • Can we come up with a failsafe hardware logic to receover from all SEU's
  • Can we develop a failsafe algorithm to keep power within budget
  • Can we afford the best possible solar cells to maximize our power

    CUBESATS: Cubesats are a program developed by Bob Twiggs at Stanford University as a means to provide low cost satellite launches for student and other low cost space experiments. All cubesats are the same 4" cube in size and are launched 3 at a time from simple standard launchers called P-PODS. Thus as many as a dozen or more may be launched on a single launch vehicle. Link to Stanford CUBESATS

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    WA8LMF Mirror of WB4APR Website - 21 July 2008