Real-Time Telemetry Transmission for CubeSat Mission using KL AP – APRS

Abstract

This paper describes the design and implementation of a ground station to receive Automatic Packet Reporting System (APRS) signals from the KLAP transmitter module designed for the KLSAT 1U CubeSat. The KLAP module enables fast transmission of telemetry data using the APRS protocol, specifically operating in the AX.25 standard. The ground station includes the use of software to determine APRS signals, a Terminal Node Controller (TNC) integrated with the antenna for signal processing, and an increase in the operating frequency to 144.390 MHz (APRS frequency). The system works with the PINPOINT APRS application and APRS.fi, allowing continuous monitoring and analysis of telemetry data from CubeSats. The test demonstrated that the KLAP module provides reliable and efficient data transmission from space to ground, demonstrating the potential of APRS technology in the development of small satellite communications.  The design ensures data integrity and low cost, making it suitable for small satellite missions. We conducted extensive practical tests to evaluate the performance of the KLAP module and ground station and demonstrated that the system can instantly and reliably identify and analyse telemetry data from CubeSats. The results highlight the effectiveness of APRS technology in improving small-scale radio communications, providing high-resolution and efficient field telemetry solutions. This study demonstrates the potential for APRS to be more widely used in satellite communications, especially in the field where limited use requires new methods of information transmission and resception.