Balloon Launch

From DevelopSpace
Jump to: navigation, search

Contact details

Requirements

Task List

n^2 Matrix

Resources

MATLAB Simulation

Mass Budget

Atmospheric conditions

SEDS Competition Rules

Testing

Rocket Models


Schedule

Oct/Nov 2007: NOVA 6 (CU)

09-12 Nov 2007: SEDS SpaceVision (MIT)

01 Feb 2008: Letter of intent deadline

approx. Apr 2008: Detailed report deadline

approx. Aug 2008: Abort test + motor test deadlines (New Mexico?)

approx. Oct 2008: SEDS Competition (New Mexico)

Avionics

ROCKET sensors:

  • GPS (for retrieval) - COCOM issues
  • barometric altimeter?


PLATFORM sensors:

  • 2 axis gyro, to determine orientation relative to ground (i.e. ADXL320)
  • camera (consider digital with onboard encoder so we can more easily store and transport the video, i.e. [1])
  • GPS (for retrieval)
  • barometric altimeter

PLATFORM comms:

  • low-bandwidth uplink (ARM, FIRE, etc)
  • high-bandwidth downlink (video, plus some GPS and altimeter data)

Example link budget:

  • Receive power = (Transmit power) + (Antenna Gains) - (Free Space Loss)
  • Free Space Loss (dB) = 20*log(4*pi*distance/wavelength)
  • Noise floor = -174dBm (receiver at room temperature) + log10(bandwidth in Hz) + CNR(dB)
  • so for zero gain antennas, 5MHz bandwidth, CNR=+9dB, we need -98dBm receive power
  • Free Space Loss for 2.4GHz signal at 30km is about 130dB
  • Therefore, (Transmit power) >= 32dBm = 1.6 Watts
  • Goes up to 16 Watts when we're at 100km

Propulsion

Media:Propulsion.xls

Atmospheric Conditions

used the DesktopAero to tabulate key conditions at an altitude of 75000 ft, assuming the balloon speed to be 20, 50, 100 and 250 ft/sec respectively. Media:rocket data.xls