https://wiki.developspace.net/w/api.php?action=feedcontributions&feedformat=atom&user=Basant 2026-04-15T11:03:53Z User contributions MediaWiki 1.37.0 https://wiki.developspace.net/w/index.php?title=File:Rocket_data.xlsx&diff=1766 2007-10-01T22:55:08Z

<p>Basant: </p> <hr /> <div></div>

Basant https://wiki.developspace.net/w/index.php?title=Balloon_Launch&diff=1765 2007-10-01T22:54:13Z

<p>Basant: </p> <hr /> <div>[[Task List]]<br /> <br /> [[n^2 Matrix]]<br /> <br /> [[Resources]]<br /> <br /> [[MATLAB Simulation]]<br /> <br /> [[Mass Budget]]<br /> <br /> [[Atmospheric conditions]]<br /> <br /> == Avionics ==<br /> <br /> ROCKET sensors:<br /> * 2 axis gyro, to determine orientation relative to ground (i.e. [http://www.analog.com/en/prod/0,2877,ADXL320,00.html ADXL320]) <br /> * camera (consider digital with onboard encoder so we can more easily store and transport the video, i.e. [http://www3.elphel.com/en/products])<br /> * GPS (for retrieval)<br /> * barometric altimeter<br /> <br /> ROCKET comms:<br /> * low-bandwidth uplink (ARM, FIRE, etc)<br /> * high-bandwidth downlink (video, plus some GPS and altimeter data)<br /> <br /> Example link budget:<br /> * Receive power = (Transmit power) + (Antenna Gains) - (Free Space Loss)<br /> * Free Space Loss (dB) = 20*log(4*pi*distance/wavelength)<br /> * Noise floor = -174dBm (receiver at room temperature) + log10(bandwidth in Hz) + CNR(dB)<br /> * so for zero gain antennas, 5MHz bandwidth, CNR=+9dB, we need -98dBm receive power<br /> * Free Space Loss for 2.4GHz signal at 30km is about 130dB<br /> * Therefore, (Transmit power) &gt;= 32dBm = 1.6 Watts<br /> * Goes up to 16 Watts when we&#039;re at 100km<br /> <br /> <br /> ==Propulsion==<br /> [[Media:Propulsion.xls]]<br /> <br /> ==Atmospheric Conditions==<br /> 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.<br /> [[Media:rocket data.xls]]</div>

Basant