Aerodrome surveillance radar ASR-23ML is intended for surveillance and air traffic control within terminal airspace. ASR-23ML 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-23ML 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).

Detailed information
Description of ASR-23ML

ASR-23ML is structurally divided into two parts and consists of equipment shelter and antenna-feed system with rotary support connected by set of cables.

Radar features automatic tracking capability as well as data receiving from other radar sensors. Data can be exchanged over a variety of communication channels in approved format.

Radar transmitter and  receiver feature solid-state components only. The transmitter has a modular design and provides ‘soft-failure’ redundancy:  failure of individual module leads to partial performance degradation.

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 the remote workstation. Remote workstation can be positioned in a Control Tower. ASR-23ML can be remotely controlled from Tower.

ASR-23ML is intended for 24/7/365 operation 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-23ML features efficient 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.

Performance characteristics of ASR-23ML
Parameter PSR SSR

Range of working frequencies, MHz

1250 – 1350 MHz

1030 MHz – interrogation

1090 MHz –RBS response

740 MHz - Eastern IFF response

Frequency agility:



  • method for frequency agility;



  • discreet steps;

400 kHz


Types of transmitted probing pulses:


Interrogation code in modes A and C


  • AM, µs;


  • phase shift keyed signals:



13 x 1.5 µs

                28-42 bit

(28,42) ×1.5 µs

Transmitter pulse power

2 kW

2 x 1 kW

Detection range for a target with RCS of 2.5m2, Р=0.5



  • minimum range

1500 m

1500 m

  • maximum range

150 km

150 km

Detection accuracy:



  • range

150 m

150 m

  • azimuth




  • range

250 m

150 m

  • azimuth

Range of adaptive MTI

0 - 150 km


Start-up time

3-5 min

Power consumption

less than 10 kW

Main characteristics