SS-1 Satellite

Satellite able to beacon and digipeat Automatic Package Reporting System (APRS) signal.

Develop Indonesian young generation space technology interest which have technical mission to provide short text message communication using Automatic Packet Reporting System (APRS) protocol. Proposing an APRS downlink on 145.825 MHz and a UHF downlink for telemetry.

SS-1 has two callsigns from its two radio systems. The first is YH1SS-1 which operates in UHF frequency, and the other is YH1SS-2 which operates in VHF frequency. Right 30 minutes after the release from the ISS, the first signal was detected from the SS-1. “SuryaSat-1 in Commissioning phase” from YH1SS-2 is the first beacon captured under the California sky. It indicates that the deployment sequence of SS-1 was running smoothly. By programming, the satellite was scheduled to start operating 30 minutes after its release from the ISS for safety purposes. In the nominal condition, the antennas would be deployed, enabling the radio to transmit some messages.

The antenna deployment status was also confirmed by an early telemetry data captured. One of the early telemetry data was captured above Adelaide, Australia with the message from YH1SS-1 below 0011111000010010;3.90;14.56;28.02;0.00;0.00 The fourth character is a flag for the antenna deployment status. It means that the success of antenna deployment evidence was not only from RF transmission, but also from the telemetry status. Other than program status flags, this telemetry has also included information about battery voltage and temperature of battery and spacecraft body. One of other message is in APRS format, for example is “T#022,205,000,000,118,113,00000000” that contains message counter and analog values of some sensors within the spacecraft. The messages of SS-1 are collected not only by SS-1 own ground station but also by the ground station network around the globe. The messages are gathered from satnogs.org, aprs.fi for international sources, and amsat.id from Indonesian stations.

The first Indonesian student CubeSat that reach Earth Orbit has been fully developed and operated. Bringing APRS payload with independently developed bus and structure, it demonstrated a two-ways communication system through satellite. The result shows the design, workflow, and AIT of SS-1 satellite is flightworthy. The ground station with two-axis pointing Yagi antenna also developed to control and monitor the satellite. SS-1 successfully deployed from International Space Station. During its operation, 22 stations around the earth have captured and decoded SS-1 signals. The successful signals receiving has become a huge steppingstone for a university-class space research project in Indonesia and a benchmark for collaboration between academia, government, and private.

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