Ground Based Radar

Ground Radar

Types of Primary Ground Radars

• Ground based Primary Radars are used in Air Traffic Control
• Area Surveillance Radar (RSR)
• En-route Surveillance Radar (Same as RSR)
• Terminal Surveillance Radar (TSR)
• Aerodrome Surveillance Radar (ASR)
• Precision Surveillance Radar (PAR)
• Aerodrome Surveillance Detection Equipment (ADSE)
• Airport Surface Movement Radar (Same as ASDE)

Area (En-route) Surveillance Radar (RSR)

• Area Surveillance Radars are long-range radars
• Used by Area Control Centre (ACC) for monitoring air routes
• Frequency: 600 – 3000 MHz
• Wavelength: 10 – 50 Cm
• PRF: 250 PPS
• Pulse Length: 2 – 4 Micro Seconds
• Ariel Rotation Rate: 5 Rotations Per Minute (RPM)
• Maximum Range: 200 – 300 NM

Terminal Surveillance Area Radar (TSR)

• Terminal Surveillance Radars are medium-range radars
• Used to maintain separation in Terminal Maintenance Area (TMA)
• Frequency: 600 – 3000 MHz
• Wavelength: 10 – 50 Cm
• PRF: 500 PPS
• Pulse Length: 1.5 – 2 Micro Seconds
• Ariel Rotation Rate: 15 Rotations Per Minute (RPM)
• Maximum Range: 75 – 100 NM

Aerodrome Surveillance Radar (ASR / SRE)

• Aerodrome Surveillance Radar are called as Surveillance Radar Equipment
• SRE are shorter range radars used by approach control
• Provides vectors to aircraft on approach if required
• Monitor aircraft until established on ILS Localiser
• Frequency: 10 GHz
• Wavelength: 10 – 50 Cm
• PRF: 1000 – 2000 PPS
• Pulse Length: 0.5 – 0.8 Micro Seconds
• Ariel Rotation Rate: 30 Rotations Per Minute (RPM)
• Maximum Range: 25 Nm (20 – 30 Nm)

Precision Approach Radar (PAR)

• Precision Approach Radars are very short-range radars
• Provides precision approach to aircraft on military airfields
• PAR consists of two radars co-located to provide azimuth and elevation
• Provides Talk Down or Continuous Instructions until touch-down
• Frequency: 10 GHz
• Wavelength: 10 – 50 Cm
• PRF: More Than 1000 PPS
• Pulse Length: 0.5 – 0.8 Micro Seconds
• Ariel Rotation Rate: Scan a sector at 120 times per minute
• Maximum Range: Less than 25 Nm

Airport Surface Detection Equipment

• Airport Surface Movement Radar or Airfield Surface Movement Indicator or Aerodrome Surface Detection Equipment helps in monitoring airfields
• Provides position of aircraft and vehicles on ground
• ASDE has a very narrow Beam Width and providing High Resolution
• Frequency: 15 – 17 GHz
• Wavelength: 2 Cm
• PRF: MORE THAN 10,000 PPS
• Pulse Length: 0.03 (1/300) Micro Seconds
• Ariel Rotation Rate: 60 RPM
• Maximum Range: Less than 5 Nm

Best of luck