Aerodrome surveillance radar ASR-22/AL is intended for surveillance and air traffi c control within terminal airspace. ASR-22/AL combines primary and secondary channels working on the same antenna as well as sidelobe suppression channel for improvement of detection capability. Primary channel of ASR-22/ AL operates in L-band (ICAO), secondary channel uses standard frequencies for RBS (interrogation – 1030 MHz, response – 1090 MHz) and optionally Eastern IFF (interrogation – 1030 MHz, response – 740 MHz).
PRINCIPLES OF MODERNIZATION
Radar features automatic tracking capability as well
as data receiving from other radar sensors. Data can be
transferred over variety of communication channels. Radar
transmitter and receiver feature solid state components
only. Transmitter has modular design and provides ‘soft-failure’
redundancy: failure of individual module leads to partial
Parameters of transmitted signal as well as parameters of signal processing after reception can be set at the operator workstation, secondary processing and tracking are performed at remote workstation. Remote workstation can be positioned in a Control Tower. ASR-22/AL can be remotely controlled from Tower.
ASR-22/AL is intended for 24/7/365 operations and is equipped with UPS guaranteeing 10 minutes of operational time in case of mains failure.
All air situation is automatically recorded with playback capability in passive and interactive modes.
ASR-22/AL is structurally divided into two parts and consists of equipment shelter and antenna-feed system with rotary support connected by set of cables.
JAMMING AND INTERFERENCE PROTECTION
ASR-22/AL features effi cient protection against pulse interference and active jamming. Level of interference is continuously monitored and graphically represented to the operator. Jamming protection is achieved through expansion of the dynamic range of the signal processor and capability of electronic frequency agility. Passive interference is rejected through digital adaptive MTI and generation of clutter map.
|Range of working frequencies, MHz||1250 – 1350||1030 – interrogation
1090 – RBS response
|- method for frequency agility||electronic||–|
|- discreet steps||400 kHz||–|
|Types of transmitted probing pulses:|
|- AM, µs||1.5||Interrogation code in
modes A and C
tP= 0.8 µs
|phase shift keyed signals:|
|- 13-bit||19.5 µs|
|- 28-88 bit||(28 – 88) x1.5 µs|
|Transmitter pulse power||4 kW||1 kW|
|Detection range for a target with RCS of 2.5m2, Р=0.5:|
|- minimum range||1000 m||2.7 km|
|- maximum range||100 km||150 km|
|- range||100 m||100 m|
|- range||250 m||150 m|
|Range of adaptive MTI||0-160 km|
|Clutter suppression ratio||> 35 dB|
|Dynamic range of receiver and digital signal processor||> 40 dB|
|Start-up time||3-5 min|
|Power consumption||less than 10 kW|