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Circuitry and Hardware

Circuitry and Hardware

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Fundamentals of Ground Radar for Air Traffic Control Engineers and Technicians — Recommend this title to your library

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The intent of this chapter is to introduce the reader to the general configuration of FAA radar installations. The FAA radar network contains a wide variety of systems: Airport Surveillance Radar (ASR), Air Route Surveillance Radar (ARSR), Airport Surface Detection Equipment (ASDE), Precision Approach Radar (PAR) (use has been discontinued in favor of instrument landing systems (ILS)), and Terminal Doppler Weather Radar (TDWR). Until deployment of the ASR-9, ASR-11, and ARSR-4, the ASR and ARSR, up to the video outputs, were very similar. This chapter will begin with a hypothetical, generic, synthesis systems as illustrated in Figure 6-1. This system will roughly resemble the ASR-8, ARSR-3, FPS-20, FPS-64, 65, 66, and 67. The system could also be converted to a magnetron system with the addition of coho phase-locking circuitry and automatic frequency control, and would then resemble the ASR-4, 5, 6, and 7, and the ARSR-1 and -2. Additionally, the USAF uses a modified version of the ASR-8 containing a magnetron and the necessary additions; in this system, the magnetron tuning is driven by the afc.

Chapter Contents:

  • A Generic System
  • Other Types
  • Data Processing
  • The Coherent Oscillator (Coho)
  • Countdown Circuitry
  • The Range Cell Counter
  • The Timing Programmed Read-Only Memory (PROM)
  • The Stagger Circuitry and PROM
  • The Modulator Trigger
  • Danger!
  • The Transmitter Modulator
  • The Pulse Transformer
  • The Filament Power Supply
  • The Charging Diode
  • The High-Voltage Power Supply
  • The Switch
  • The ASR-8 Magnetic Modulator
  • The Power Klystron Tube
  • The Exciter and rf Driver
  • The Duplexer
  • The Four-Port Circulator
  • Directional Coupler
  • The Waveguide Switch
  • Three Modes of a Radar Channel
  • The Antenna
  • The Azimuth Pulse Generator (apg)
  • Aligning the apg
  • Newer 16,384-ACP Generators
  • The Rotary Joint
  • Antenna Polarization and Control
  • The Basic Principle of Circular Polarization
  • Active and Passive Feedhorns
  • The T-R Device
  • The stc Module
  • The Beam Switch
  • The Preselector Filter
  • The Low-Noise Amplifier (lna)
  • The Crystal Mixer
  • The Preamplifier
  • The Stalo
  • The i-f Amplifiers
  • The Normal i-f Amplifier
  • Fast Time Constant (ftc)
  • The Logarithmic i-f Amplifier
  • The MTI i-f
  • Quadrature Phase Detection
  • The MTI Analog-to-Digital (A/D) Converter
  • The MTI Processor
  • The Enhancer
  • The Log and Normal Receiver Processing
  • Differentiating ftc
  • IAGC and Soft Limiting
  • Constant False Alarm Rate (CFAR)
  • Delay-Line ftc
  • The Destagger Circuitry
  • Normal A/D and Enhancer
  • The Digital-to-Analog Converters
  • The Line Drivers
  • The Digitizer
  • Review Questions
  • Answers to Review Questions

Inspec keywords: Doppler radar; search radar; magnetrons

Other keywords: ASDE; USAF; airport surface detection equipment; coho phase-locking circuitry; magnetron system; terminal Doppler weather radar; ARSR; automatic frequency control; airport surveillance radar; ILS; ASR; magnetron tuning; air route surveillance radar; instrument landing systems; FAA radar network; precision approach radar; TDWR

Subjects: Radar equipment, systems and applications; Microwave tubes

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