The oncoming project of the Indonesian National Institute of Aeronautics and Space, LAPAN (Lembaga Penerbangan dan Antariksa Nasional) consists of a Low Earth Orbit multi-mission constellation of telecommunication microsatellites. These satellites will carry a data-collecting platform for early warning systems as the primary payload and several other missions such as air traffic monitoring, ship monitoring, and amateur telecommunication payload. In the primary payload, it will use a multi-purpose transceiver for receiving the early warning sensor then send the data to the ground station. As for the secondary mission, the same concept will also be used. This paper discusses the design and implementation of the multi-purpose transceiver for the secondary payload multi-mission microsatellite. As the basis for baseband and RF front-end design, mission analysis of secondary payload and data rate calculation was conducted. The implementation of the multi-purpose transceiver was based on COTS SDR with GNU radio software architecture. The measurement results of the breadboard model are presented and discussed. The outcome of the test shows that the multi-purpose transceiver with multi-application such as ADS-B receiver, TT&C transceiver, and payload data transmitter has been performed well. The TT&C and payload data transmitter with convolutional code rate r = ½, k = 7 with a maximum data rate of 5 Mbps has been demonstrated. Consequently, it is required to add a 35 dB power amplifier to achieve 27 dBm as per link calculation. Subsequently, the ADS-B receiver requires an additional 30 dB low noise amplifier to achieve G/T -22 dB/K. Finally, to reduce the frequency harmonic generate by the local oscillator, a bandpass filter which has minimum rejection > 30 dB at the cut frequency.
Low Earth orbit multi-mission satellite transceiver based on software-defined radio
THE 8TH INTERNATIONAL SEMINAR ON AEROSPACE SCIENCE AND TECHNOLOGY – ISAST 2020 ; 2020 ; Bogor, Indonesia
AIP Conference Proceedings ; 2366 , 1
13.09.2021
12 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch