Next generation earth-to-space telecommand coding and synchronization: ground system design, optimization and software implementation

Author:

Abelló Ricard,Baldi Marco,Carvalho Filipe,Chiaraluce FrancoORCID,Fernandes Ricardo,Garello Roberto,Paolini Enrico,Prata Ricardo

Abstract

AbstractThe Consultative Committee for Space Data Systems, followed by all national and international space agencies, has updated the Telecommand Coding and Synchronization sublayer to introduce new powerful low-density parity-check (LDPC) codes. Their large coding gains significantly improve the system performance and allow new Telecommand services and profiles with higher bit rates and volumes. In this paper, we focus on the Telecommand transmitter implementation in the Ground Station baseband segment. First, we discuss the most important blocks and we focus on the most critical one, i.e., the LDPC encoder. We present and analyze two techniques, one based on a Shift Register Adder Accumulator and the other on Winograd convolution both exploiting the block circulant nature of the LDPC matrix. We show that these techniques provide a significant complexity reduction with respect to the usual encoder mapping, thus allowing to obtain high uplink bit rates. We then discuss the choice of a proper hardware or software platform, and we show that a Central Processing Unit-based software solution is able to achieve the high bit rates requested by the new Telecommand applications. Finally, we present the results of a set of tests on the real-time software implementation of the new system, comparing the performance achievable with the different encoding options.

Funder

European Space Agency

Publisher

Springer Science and Business Media LLC

Subject

Computer Networks and Communications,Computer Science Applications,Signal Processing

Reference22 articles.

1. Consultative Committee for Space Data Systems (CCSDS), Telecommand, CCSDS 200.0-G-6 Green Book (1987)

2. Consultative Committee for Space Data Systems (CCSDS), Next Generation Uplink, CCSDS 230.2-G-1 Green Book (2014)

3. G. Kazz, E. Greenberg, C. Scott, Replacing the CCSDS telecommand protocol with the next generation uplink (NGU), in Proceedings of the 2012 AIAA International Conference Space Operations, Stockholm, Sweden (2012)

4. N. Peccia, A brief story of a success: the CCSDS, in Proceedings of the 2014 AIAA International Conference on Space Operations, Pasadena, CA, USA (2014)

5. Consultative Committee for Space Data Systems (CCSDS), TC Synchronization and Channel Coding, CCSDS 231.0-B-3 Blue Book (2014)

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