CCSDS-compliant multi-Gbps modulator (Courtesy of TESAT, EQM)
Enabling & Support

EGRET - Next Generation High Rate Telemetry

02/06/2017 599 views 2 likes
ESA / Enabling & Support / Space Engineering & Technology / Shaping the Future
 Programme:  TRP Workplan  Achieved TRL:  3
 Reference:  T106-402ET  Closure:  2017
 Contractor(s):  Politecnico di Torino (IT), Universita’ di Parma (IT), TESAT (DE)

 
Despite the progress made concerning data compression, several factors are pushing future Earth Observation missions towards an ever-increasing data return, and direct LEO-to ground systems are migrating from the X-band to the K-band. Geometrical and atmospheric factors contribute to a large dynamic range of the power, a fact that gives rise to the concept of link adaptation. To support link adaptation, the Consultative Committe for Space Data Systems (CCSDS) 131.2-B-1 standard waveform includes a range of Modulation & Coding options (ModCods), with spectral efficiencies up to 5.4 bit/sec/Hz (64APSK). However, recent studies demonstrated that this set of CCSDS ModCods saturates above a certain elevation angle, beyond which a growing gap with respect to achievable capacity is witnessed.

Objectives

  • To extend the CCSDS Waveform beyond 64APSK
  • To study advanced signal processing techniques for spectral efficiency improvement
  • To define the Next Generation CCSDS Waveform (for standardization)
  • To provide the relevant Technology Support & Roadmap
Spectral efficiency of new MODCODs
Spectral efficiency of new MODCODs

Achievements and status
This study provides a roadmap for the long-term evolution of future direct LEO-to-ground Earth Exploration Satellite Services (EESS) systems, addressing their overall architecture with a view of reaching the full data rate capabilities, while at the same time optimizing the power consumption and operational flexibility.

Benefits
Increased available signal-to-noise and spectral efficiency ranges ([0,30] dB, [0.4-7.4] bit/sec/Hz) with performance close to the theoretical limit. Maximization of the throughput on a single pass.

Next steps
Updating of the CCSDS standard to include the 10 newly developed ModCods to support 128 and 256 points constellations. Development of hardware prototype in support of the new ModCods.

Related Links