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On-board interference detection and localization for satellite communication

On-board interference detection and localization for satellite communication

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Interference is identified as a critical issue for satellite communication (SATCOM) systems and services. There is a growing concern in the satellite industry to manage and mitigate interference efficiently. In this context, an on-board spectrum monitoring and localization unit can be used to detect and localize the interference reliably. Current satellite spectrum monitoring and localization units are deployed on the ground, and the introduction of an in-orbit spectrum monitoring and localization unit can bring several benefits, e.g., simplifying the ground-based station in multibeam systems. This chapter presents the interference detection and localization techniques which take place on-board the satellite within a digital transparent processor (DTP) satellite payload or in a partially regenerative satellite. First, the conventional energy detector (CED) is presented, which is an efficient technique to monitor strong interference in SATCOMs. However, weak interference is not so easily detectable because of its low interference-to-signal-plus-noise ratio (ISNR). To address this issue, a second detector is discussed, which exploits the frame structure and pilot symbols of the SATCOM standards. Assuming that the pilot signal is known at the receiver, it can be removed from the total received signal, and then, an ED technique can be applied on the remaining signal to decide on the presence or absence of interference. Nevertheless, the detection at low values of ISNR may require more samples than the number of pilots supported by the standards. For this reason, a third detector is introduced by demodulating the desired signal, removing it from the total received signal and applying an ED in the remaining signal for the detection of interference. After detecting the interference, the interferer needs to be localized and, hence, this chapter describes the current techniques for on-ground interference localization and presents an on-board interference localization technique using frequency of arrival (FoA) via a single satellite.

Chapter Contents:

  • 14.1 Introduction
  • 14.2 On-board digitization
  • 14.3 Satellite interference
  • 14.3.1 Intrasystem interference
  • 14.3.2 External interference
  • 14.4 Interference detection techniques
  • 14.4.1 Conventional energy detector
  • 14.4.2 Energy detector with imperfect signal cancellation in the pilot domain
  • 14.4.3 Energy detector with imperfect signal cancellation in the data domain
  • 14.4.3.1 Probability of false alarm for QPSK signals
  • 14.5 Current localization techniques
  • 14.6 Interference localization using frequency of arrival via a single satellite
  • 14.7 Localization algorithm and solution
  • 14.8 Numerical results
  • 14.8.1 Performance analysis of interference detection techniques
  • 14.8.2 Performance analysis of interference localization techniques
  • 14.9 Conclusion
  • References

Inspec keywords: radiofrequency interference; demodulation; satellite communication

Other keywords: satellite communication; DTP satellite payload; conventional energy detector; ED technique; pilot symbols; on-board interference localization technique; interference mitigation; satellite spectrum monitoring unit; ground-based station; frequency-of-arrival; in-orbit spectrum monitoring unit; FoA; satellite spectrum localization unit; CED; in-orbit spectrum localization unit; digital transparent processor satellite payload; multibeam systems; interference management; frame structure; on-ground interference localization; on-board spectrum monitoring; interference-to-signal-plus-noise ratio; SATCOM standards; on-board interference detection

Subjects: Modulation and coding methods; Satellite communication systems; Signal processing and detection; Electromagnetic compatibility and interference

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