Stealth Waveforms

Stealth Waveforms

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The primary unique criterion for stealth waveform design is reasonably flat, total operating frequency band coverage. This objective isn't always compatible with best data link or radar mode performance. Some obvious criteria are stated in this section. These criteria are then applied to various spread spectrum strategies such as frequency diversity, discrete phase codes, linear FM, and hybrid waveforms. LPI requirements, in addition to SNR considerations, dictate the use of high duty cycle waveforms. This result has two implications: (1) That the transmitted pulse period must be incrementally variable and (2) that large expansion/compression ratios usually are involved.

Chapter Contents:

  • 5.1 Waveform Criteria
  • 5.2 Frequency Diversity
  • 5.2.1 Simultaneous Transmit and Receive Crosstalk
  • 5.2.2 Low-Noise Adaptive Multifrequency Generation
  • 5.2.3 Detection of Multifrequency Waveforms
  • 5.3 Power Management
  • 5.4 Pulse Compression
  • 5.4.1 Linear FM/Chirp
  • 5.4.2 LPI Performance Loss Incurred by Use of Chirp
  • 5.4.3 Stretch Processing
  • 5.5 Discrete Phase Codes
  • 5.5.1 Barker Codes
  • 5.5.2 Frank and Digital Chirp Codes
  • 5.5.3 Complementary Codes
  • Complementary Code Overview
  • Type II Complementary Codes
  • Polyphase Complementary Codes
  • Self-Noise Performance of Complementary Codes
  • 5.6 Hybrid Waveforms
  • 5.6.1 Hybrid Spread Spectrum Stretch (S-Cubed)
  • 5.6.2 Hybrid Spread Spectrum Stretch Processing
  • 5.6.3 Waveform and Processing Parameters
  • 5.7 Noise Propagation in Pulse Compressors
  • 5.8 Waveform Summary
  • 5.9 Exercises
  • 5.10 References

Inspec keywords: spread spectrum communication; phase coding

Other keywords: data link; LPI requirements; frequency diversity; transmitted pulse period; spread spectrum strategies; radar mode performance; high duty cycle waveforms; hybrid waveforms; SNR considerations; stealth waveform design; linear FM; total operating frequency band coverage; discrete phase codes

Subjects: Radio links and equipment; Codes

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