Modernization of early-warning VHF radar 5N84A (5N84, 44Zh6 or P-14) offers the best (in terms of efficiency/cost ratio) alternative to restoration or repair of legacy prototypes.

Modernization of 5N84A features:
– metric band for “counter-Stealth” capability;
– maximum use of COTS components;
– option of containerized solution (two 20ft ISO);
– stable, fail-soft, modular solid-state transmitter;
– built-in test equipment;
– no special adjustments required during operation;
– largely simplified maintenance;
– engineered for minimum cost of ownership.

As a result of modernization the radar’s detection performance is efficiently improved. Modernized 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.

Depth of modernization:

The radar’s equipment cabin is fully modernized. Metric band is preserved, however the number of working frequencies is increased from 4 to 200, the capability of instantaneous electronic frequency agility is added. 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.

Antenna-mast assembly is equipped with new asynchronous motor drives controlled by frequency inverters.

Modernized 5N84ALA radar remains a two-dimensional system and is used to find azimuth and range. Altitude can be obtained by interfacing modernized height-finding radars. 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. Both workstations are installed in the equipment cabin in standard configuration.

As an option, ground interrogator can be controlled in auto- and semiautomatic modes with assigning aircraft state identification status. All air situation is automatically recorded with playback capability in passive and interactive modes.

Modernized 5N84ALA radar 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.

Equipment of 5N84ALA can be installed on a semitrailer or in two standard sea containers mounted stationary or on a vehicle.

No. Parameter Value
before modernization after modernization
1 Range of working frequencies, MHz 170-190 160-200
2 Frequency agility:
– method for frequency agility; electromechanical electronic
– discreet steps; 4 fixed frequencies 200 kHz
– frequency setting accuracy. n/a ±10 kHz
3 Types of transmitted probing pulses:
– short pulse; 10 µs 10 µs
– phase shift keyed signals:
                – 13-bit; 13 × 10 µs
                – 28-88 bit. (28 – 88) × 10 µs
4 Transmitter pulse power 700 kW 30 kW
5 Capability of instant probing signal power and structure changes Not implemented Implemented
6 Detection range for a target with RCS of 2.5m², Р=0.5:
min range 2,7 km
at altitude of Н=100 m 30 km 37 km
at altitude of Н=500 m 85 km 105 km
at altitude of Н=1000 m 110 km 130 km
at altitude of Н=3000 m 185 km 220 km
at altitude of Н=10000 m 290 km 340 km
7 Detection accuracy:
– range 1000 m 270 m
– azimuth 0.80 0.40
8 Resolution:
– range 3500 m 1600 m
– azimuth 80 80
9 Range of adaptive MTI 0-500 km
10 Clutter suppression ratio > 40 dB
11 Dynamic range of receiver and digital signal processor > 100 dB
12 Automatic control of modernized height-finders Implemented
Number of controlled height-finders up to 4
13 Start-up time 8 min 3 min
14 Power consumption 60 kW up to 40 kW