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Improving the System Against Jammers

Improving the System Against Jammers

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This chapter discusses in detail three solutions to reduce the effects of jammers: a method to protect the system against pulse or burst jammers, an adaptive filter to reduce narrowband jammers such as continuous wave (CW), and a jammer reduction technique called a Gram-Schmitt orthogonalizer (GSO). Other techniques to reduce the effects of jammers are antenna siting, which mounts the antenna away from structures that cause reflections and potential jammers, and the actual antenna design to prevent potential jammers from interfering with the desired signal. In addition, in some systems, the ability for another receiver to detect the transmitted signal is important. These types of receivers are known as intercept receivers. A discussion is presented on the various types of intercept receivers, and the advantages and disadvantages of each are evaluated.

Chapter Contents:

  • 8.1 Burst Jammer
  • 8.2 Adaptive Filter
  • 8.3 Digital Filter Intuitive Analysis
  • 8.4 Basic Adaptive Filter
  • 8.5 Least Mean Square Algorithm
  • 8.6 Digital/Analog ALE
  • 8.7 Wideband ALE Jammer Suppressor Filter
  • 8.8 Digital Circuitry
  • 8.9 Simulation
  • 8.10 Results
  • 8.11 Amplitude and Phase Suppression Results
  • 8.12 Gram-Schmidt Orthogonalizer
  • 8.13 Basic GSO
  • 8.14 Adaptive GSO Implementation
  • 8.15 Intercept Receiver Comparison
  • 8.16 Summary

Inspec keywords: adaptive signal detection; jamming; radio receivers; adaptive filters; interference suppression; antennas

Other keywords: Gram-Schmitt orthogonalizer; GSO; intercept receiver; jammer reduction technique; pulse jamming; potential jammer; antenna siting; adaptive filter; transmitted signal detection; reflection

Subjects: Single antennas; Radio links and equipment; Electromagnetic compatibility and interference; Signal detection; Filtering methods in signal processing

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