FMCW Waveform

FMCW Waveform

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In this chapter, we have studied LFM waveform compression using correlation and stretch techniques. We then studied the basic FMCW radar theory and equations. We have also studied the effect of target Doppler on radar performance and how to measure it. We have then investigated the factors affecting range resolution like sweep times and beat frequency resolution. In particular, we have investigated problems like target return spectral width and receiver frequency resolution, which play such a key role in determining the beat frequency resolution which lead to our final receiver range bin resolution. Finally, through worked examples we investigated the problems pertaining to non-linearities and its control. In this process, we have investigated the trade-offs one needs to make between controlling the level (percentage) of non-linearities and the receiver frequency resolution leading to the final beat frequency resolution. This needs to be done without an excessive instrumented range in the radar. We shall use all this knowledge in Part III when we design the Pandora radar. We concluded this chapter by studying an interesting example of what can be achieved with FMCW technology in the area of antitank missiles.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Waveform Compression
  • 4.2.2 Time-Bandwidth Product
  • 4.2.3 LFM Waveform Compression
  • Correlation processor
  • Stretch Processor
  • 4.3 FMCW System
  • 4.4 Advantages of an FMCW System
  • 4.5 Basic Equations of FMCW Radars
  • 4.5.1 The FMCW Equation
  • 4.6 Triangular Waveform
  • 4.7 Effect of Sweep Time on Range Resolution
  • 4.8 Effect of Receiver Frequency Resolution and Target Spectral Width on Range Resolution
  • 4.9 Concept of Instrumented Range
  • 4.10 Nonlinearity in FM Waveforms
  • 4.10.1 Coherent Processing Interval
  • 4.11 It All Comes Together. Application: Brimstone Antitank Missile
  • 4.11.1 System Speci?cations
  • 4.11.2 Seeker Speci?cations (Known)
  • 4.11.3 Operational Procedure (LOAL)
  • 4.11.4 System Performance (Speculated)
  • 4.12 Summary

Inspec keywords: FM radar; radar theory; CW radar

Other keywords: antitank missiles; FMCW technology; receiver range bin resolution; FMCW radar theory; receiver frequency resolution; LFM waveform compression; FMCW waveform; target return spectral width; Pandora radar; beat frequency resolution; target Doppler; radar performance

Subjects: Radar theory; Radar equipment, systems and applications

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