• Document: FleXLink. Multi-Gigabit Data Downlink End-to-End Chain SPACE SEGMENT GROUND SEGMENT
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FleXLink Multi-Gigabit Data  Downlink End-to-End Chain WHITE PAPER: MAXIMIZING THROUGHPUT IN SATELLITE TO GROUND TRANSMISSIONS SPACE SEGMENT TRANSMITTER HIGH POWER AMPLIFICATION ONBOARD CODING + ANTENNA MODULATION MASS MEMORY ACM PROPAGATION INSTRUMENT UPLINK/TT&C RECEIVER ANTENNA RECEIVER + LNA UPLINK/TT&C TRANSMITTER ACM PROCESSING DEMODULATOR + DECODER DISTRIBUTION GROUND SEGMENT Tesat-Spacecom JUNE 2017 Kongsberg Spacetec Executive Summary Earth Observation (EO) and Intelligence, Surveillance and Reconnaissance (ISR) Systems equipped with Synthetic Aperture Radar (SAR) and/or High Resolution Optical instruments are designed for high- performance operations in terms of fast revisit time, for very short system response time and for provid- ing actionable intelligence with low data latency. However, higher speeds and increasing bandwidth for data download are needed as the marketplace becomes more saturated and competitive with increasing numbers of satellites, from both commercial and government stakeholders. The increased reliance on this data for increasingly more urgent applications has created demand for decreasing latency, for all datasets, including Earth observation, radar, communication, and weather satellites. A satellite system is mainly composed of two segments – space and ground – that are connected by an important and complex network of communications that enables efficient management of the operations and data. Each of these segments is important for the successful collection and distribution of the data towards creating the actionable intelligence and solutions that are greatly needed by society, academia and governments worldwide. This paper shares details regarding a new data transmission solution to efficiently use the available radio frequency (RF) bandwidth most commonly used for downlink. A discussion of advantages compared to legacy systems is included. The solution includes a Gigabit Modulator (the Space Segment) and a High Rate Demodulator and Front- End Processor (HRDFEP, the Ground Segment), which when combined provide customers with a full End-to-End Solution for faster, more robust data downlinks. Benefits of FleXLink The solution has been verified using engineering models. Key benefits include automated adaptability for varying Maximizing Data Throughput RF link conditions; the amount of data automatically adjusts according to the link budget, maximizing Minimized Latency of Data throughput of data volume and speed. Reduced Ground Station Contacts The solution comes from two respected compa- High Spectrum Efficiency nies, Tesat-Spacecom (for the Space Segment) and Kongsberg Spacetec (for the Ground Segment). High Transmit Power Efficiency Verified Technology The key technology A Reliable End-to-End Solution is Adaptive Coding & Modulation (ACM) allowing the volume of data to adapt to link budget characteristics. 2 Table of Contents Executive Summary................................................................................................................................... 2 1 Problem Statement............................................................................................................................... 4 2 Proposed Technical Solution............................................................................................................. 5 2.1 System Description..................................................................................................................................... 5 2.1.1

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