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High Range-Resolution Techniques

High Range-Resolution Techniques

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Introduction to Sensors for Ranging and Imaging — Recommend this title to your library

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The range resolution of a sensor is defined as the minimum separation (in range) of two targets of equal cross section that can be resolved as separate targets. It is determined by the bandwidth of the transmitted signal, Δf (Hz), which is generated by widening the transmitter bandwidth using one of the following modulation forms: amplitude modulation, frequency modulation, phase modulation.

Chapter Contents:

  • 11.1 Classical Modulation Techniques
  • 11.2 Amplitude Modulation
  • 11.2.1 Range Resolution
  • 11.3 Frequency & Phase Modulation
  • 11.3.1 Matched Filter
  • 11.4 Phase-Coded Pulse Compression
  • 11.4.1 Barker Codes
  • 11.4.2 Random Codes
  • 11.4.2.1 Optimal Binary Sequences
  • 11.4.3 Correlation
  • 11.4.3.1 Binary Correlation
  • 11.4.3.2 Circular Correlation
  • 11.5 SAW Based Pulse Compression
  • 11.6 Step Frequency
  • 11.7 Frequency-modulated continuous-wave Radar
  • 11.7.1 Operational Principles
  • 11.7.2 Matched Filtering
  • 11.7.3 The Ambiguity Function
  • 11.7.4 Effect of a Non-Linear Chirp
  • 11.7.5 Chirp Linearization
  • 11.7.5.1 Open Loop Techniques
  • 11.7.5.2 Determining the Effectiveness of Linearization Techniques
  • 11.7.5.3 Implementation of Closed-Loop Linearization
  • 11.7.5.4 Direct Digital Synthesis
  • 11.7.6 Extraction of Range Information and Range Gating
  • 11.7.6.1 FFT Processing
  • 11.7.6.2 Other Range Gating Methods
  • 11.7.7 Problems with FMCW
  • 11.8 Stretch
  • 11.9 Interrupted FMCW
  • 11.9.1 Disadvantages
  • 11.9.2 Optimizing for a Long Range Imaging Application
  • 11.9.3 Implementation
  • 11.10 Sidelobes and Weighting for Linear FM Systems
  • 11.11 High Resolution Radar Systems
  • 11.11.1 Industry
  • 11.11.2 Automotive Radar
  • 11.11.3 Research Radars
  • 11.12 Worked Example: Brimstone Antitank Missile
  • 11.12.1 System Specifications
  • 11.12.2 Seeker Specifications (known)
  • 11.12.3 Operational procedure-Lock-on after launch
  • 11.12.4 System Performance (speculated)
  • 11.12.4.1 Target Detection and Identification
  • 11.12.4.2 Radar Front End
  • 11.12.4.3 Antenna and Scanner
  • 11.12.4.4 Signal Processing
  • 11.12.4.5 Signal-to-Clutter Ratio: Clutter Levels
  • 11.12.4.6 Target Levels
  • 11.12.4.7 Signal-to-Clutter Ratio
  • 11.12.4.8 Signal-to-Noise Ratio
  • 11.12.4.9 Target Identification: Doppler Processing
  • 11.12.4.10 Target Identification: Other Techniques
  • 11.12.5 Tracking and Guidance
  • 11.13 References

Inspec keywords: frequency modulation; phase modulation; amplitude modulation; radio transmitters

Other keywords: separate targets; equal cross section; transmitter bandwidth; high range-resolution techniques; frequency modulation; transmitted signal; minimum separation; phase modulation; sensor; amplitude modulation

Subjects: Radio links and equipment; Modulation and coding methods

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