IARU Amateur Satellite Frequency Coordination

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ORCASat Updated: 10 May 2021   Responsible Operator Peter Driessen VE7AB
Supporting Organisation University of Victoria  
Contact Person peter@ece.uvic.ca.nospam  
Headline Details: A 2U CubeSat. Primary mission: The primary mission of ORCASat is student education and highly qualified personnel training in aerospace engineering through having university students at the undergraduate and graduate level undertake a real life satellite mission. Secondary mission: The purpose of the secondary mission is to provide requirements and constraints to the construction of ORCASat, and expose students to the process of designing a satellite meeting them. This makes the primary mission a much more valuable learning experience by making the project resemble what is done in industry. The secondary mission is an optical calibration light source in low Earth orbit that will be used by research and educational groups to calibrate ground based optical telescopes. Calibration of these telescopes will be used to remove uncertainties on photometric measurements caused by the attenuation of Earth’s atmosphere. By placing a known light source above the atmosphere, information about the light source can be downlinked to the telescope as seen from the satellite and compared to the telescopic measurements. This has the potential to decrease the uncertainties on the measurements taken by ground positioned telescopes by an order of magnitude. Proposing UHF downlinks using Option 1: ● 14.4 kbit/s data rate 2-ary MSK, FEC encoding using convolutional code, R=½, K=4 (28.8 kbit/s bit rate), FEC decoding with the Viterbi algorithm Option 2: ● 0.6 kbit/s bit rate 2-ary FSK, FEC encoding using convolutional code, R=½, K=4 (1.2 kbit/s bit rate), FEC decoding with the Viterbi algorithm. Planning a NanoRacks deployment Q4 2021/Q1 2022. More info at https://gitlab.com/ORCASat/ttc/iaru and at https://www.orcasat.ca/ **A downlink on 437.060 MHz has been coordinated** ** Emission description has been updated to:2-ary FSK with 25 kHz necessary bandwidth, 10.17 kbps data rate, 6.18 kHz deviation, data whitening using PN9 sequence**
Application Date: 23 Jul 2020   Freq coordination completed on 09 Mar 2021

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