The spectrum crunch – a radar perspective

The spectrum crunch – a radar perspective

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This chapter has provided an introduction to the spectrum crunch problem from a radar perspective. At one level it can be said that the problem is already severe. There is ever-greater competition for a resource that is strictly finite, and radar is only one voice among many pressing their case. All users have a need for greater bandwidth, and the only thing that can be said with certainty is that the problem is only going to get worse.Yet if spectrum usage were measured at a given point as a function of frequency, time, space and polarisation, it would certainly be found that the spectrum is currently not being used that efficiently. There is therefore great potential for approaches aimed at using the spectrum in a more efficient and dynamically controlled manner. The regulatory framework has thus far taken a relatively conservative approach. However, it is important to have a proper quantitative understanding of the effect of interference of one service upon another in order to adopt appropriate regulation measures, rather than taking the view that no service should ever occupy the same part of the spectrum as any other. To date, a number of novel radar technology approaches have been introduced, including improvements to the spectral purity of transmitters, intelligent, cognitive approaches to dynamic frequency allocation, passive sensing based on the emissions of other RF applications, and even through learning to mimic the behaviour of echolocating animals. These topics and others are developed in the chapters that follow, and give some cause for optimism that a solution can be found.

Chapter Contents:

  • 2.1 Introduction
  • 2.2 The radar spectrum environment
  • 2.3 Signal spectra
  • 2.3.1 Spectra of practical emissions
  • 2.3.2 Radar emissions
  • 2.3.3 Radar transmitters
  • 2.4 Spectrum allocation
  • 2.4.1 Competition for spectrum
  • 2.4.2 Spectrum regulation
  • 2.5 Radar interference to other users
  • 2.5.1 Radar interference to other radars
  • 2.5.2 Radar interference to other systems
  • 2.5.3 WiMAX and LTE communication systems
  • 2.6 Interference to radar by other users
  • 2.7 Technology developments
  • 2.7.1 Passive bistatic radar
  • 2.7.2 Waveform diversity
  • 2.7.3 Bio-inspired approaches
  • 2.7.4 Cognitive radar
  • 2.8 Conclusions
  • Acknowledgements
  • References

Inspec keywords: signal detection; radar; cognitive radio; frequency allocation; radiofrequency interference

Other keywords: spectral purity; dynamic frequency allocation; spectrum crunch; passive sensing; echo-locating animals; interference; cognitive approaches; regulatory framework; transmitters; spectrum usage; radar perspective

Subjects: Signal detection; Radio links and equipment; Electromagnetic compatibility and interference; Radar equipment, systems and applications

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