ZSU–23–4 SHILKA
Driver-operator surveillance system
The Puma Driver-Sofia optoelectronic system of the driver is installed
Guidance angles
Ability to integrate into the automated control system “Alliance”.
A single digital IP network and a system of automatic functional control of details are built-in.
ARM-K  Control
ZSU–23–4 “Shilka” was modernized in order to more effectively hit small and low–altitude unmanned aerial vehicles, including prospective ones, and its outdated and unsuitable under the modern jamming countermeasures radar complex PKK–2 was replaced.

Instead of it, ZSU–23–4 “Shilka” has got a newest optical–electronic reconnaissance and targeting complex, which allows detecting an aerial target in passive mode such as a helicopter or a small plane at a distance of up to 20,000 meters and tracking it from a distance of  16,000 meters, and detecting and tracking small targets (30x30 cm) from a distance of 2000 meters.
Self-propelled anti-aircraft gun ZSU-23-4 “SHILKA”
The self-propelled anti-aircraft gun ZSU-23-4 “Shilka” is equipped with the AZP-23 quadruple automatic 23-mm rapid-fire artillery cannon and provides effective countermeasures by air-breathing threats at low and ultra-low altitudes, to ground lightly armored vehicles and enemy fighters.
The modernization option allowed not only to significantly increase the accuracy of calculating the target predicted coordinates and other parameters, including the target detection range, but also due to the passive operation mode, increased the stealth and survivability of combat vehicle.

Another modernization result was a decrease of almost two tons of the total weight of combat vehicle, which reduced the load on traction engine, improved the cross-country ability of self-propelled gun and provided the crew with space for additional ammunition and equipment.

In addition, it became possible to operate ZSU-23-4 “Shilka” at night without the use of lighting devices.
Passive target detection system
Electro-optical
station “Strizh-M3”

up to 20000 m

Television channel
Armament:  4 x 23 mm rapid-fire artillery cannon AZP-23
Total weight of second salvo: 11
Shells ammunition: 1500
Rounds/min rate of fire: 3400
Kg
CREW
Killing Height up to 1500m
Killing RANGE up to 2500m
2644 - 3764 mm Height
3075 mm Width
6495 mm Length
INSTALLATION OF NEW UNITS:

■ Electro-optical device station Strizh-M3;
■ Automated workstations for commander, gunner and range operator;
■ On-board orientation and navigation facility;
■ Driver’s electro-optical station “Puma Driver Sofia”.
NAVIGATION
UNIT
AIR CONDITIONER
CONTROL UNIT
PUMA DRIVER SOFIA
ARM-K
ARM-N
ARM-D
COMPRESSOR
STRIZH-M3
The variant of modernization of ZSU-23-4 “Shilka” proposed by LLC “BSVT - New Technologies” contemplates almost complete replacement of all elements of the radar equipment system (further in the text - RPK), including: radar station 1RL33, computing instrument, sighting line stabilization system, and firing line stabilization system.
Radar system RPK on the self-propelled anti-aircraft gun was replaced with a modern electro-optical device station “Strizh-M3”, which not only significantly increases precision in calculation of collision point coordinates and other parameters, including the target acquisition range, that influence efficiency of combat employment, but also contributes to increased SPAAG security and survivability by using the passive mode of operation.
As a complementary result of the performed upgrade, gross laden weight of the combat vehicle reduced almost by two tons, which in turn decreased load to the traction engine, and furnished the crew with additional space for weapons, reserve ammunition for them, food supplies and crew’s effects. Upgrade of SPAAG equipment also includes upgrade of the GM-575: of the primary power supply system, of the automatic fire suppression system (change-over to the fire-extinguishing carbon dioxide mixture replacing the toxic Freon “compound 3.5”), and the driver’s system of field surveillance in degraded visual environment.
NAVIGATION UNIT

Navigation unit is an on-board complex of orientation and navigation devices. It is intended for determination of exact coordinates of position, pitching and yaw angles. Arranges conversion of target coordinates to the combat vehicle position.

PROVIDES FOR:

■ determination of navigational parameters of the CV: lati-tude, longitude, altitude;
■ determination of current values of altitude of the CV: course, inclination, pitching;
■ determination of motion parameters of the CV: covered distance and speed;
■ precise topographic positioning and CV land navigation when GLONASS/GPS satellite signals are absent or in-tentionally rejected;
■ synchronization of operation of on-board equipment of the CV (creation of time markers bound to the universal coor-dinated time scale UTC (RUS);
■ CV position indication on a digital map;
■ determination and indication of march movement calcula-tion (distance to the firing site; course to the firing site and deviation from the set course; estimated time in transit; an-ticipated fuel consumption);
■ documented results of work;
■ performance of automatic self-inspection of serviceability, and provision of results to display screens.
MODERNIZATION RESULTS:

■ Possibility of passive operation in all modes;
■ Possibility of making reconnaissance without launching major units of the power supply system;
■ Use of the leading-edge hardware components;
■ Increased distance of target acquisition and tracing;
■ Target identification during the night;
■ Increased precision of positioning and orientation;
■ Automation of receipt of information about air situation and target identi-fication from forward command posts;
■ Ability to move at night time without lighting units;
■ Independence of the engine air starting system;
■ Ergonomics and comfortable operating environment for the crew;
■ Common digital IP network of the combat vehicle;
■ Possibility to integrate into automated control systems;
■ Automatic functional control of modules and units;
■ Restitution of combat readiness and improved combat capabilities.