1. 3-coordinate Coastal Radar with Multi-beam Active Phased Array
(COAST-APA)

2. Radar purpose :
COAST-APA radar is designed for air and surface surveillance, and can be used both stand-alone and as the part of an integrated system of coastal surveillance.
Performs automatic detection, track initiation and tracking of air targets at high, medium and low altitudes and surface targets under heavy interference conditions.
It provides continuously updated data for the azimuth, elevation and range.
Space surveillance using multi-beam radiation pattern provides maximum values ​​of elevation in the field of view, high-speed data update of the targets coordinates and effective operation under difficult interference conditions.
 It can be performed in a stationary or mobile variants. .  .

3. TECHNICAL CHARACTERISTICS
1. Frequency band C-band (NATO G-band)
2. Elevation coverage up to 60° (depending on operational mode)
3. Altitude coverage up to 20 km
4. Operational modes:
- Ultra-Long-Range mode instrumental range up to 180 km
Long-Range mode instrumental range up to 128 km
Medium-Range mode instrumental range up to 64 km
- Short-Range mode instrumental range up to 32 km
5. Rotation speed ; 30 r.p.m.
6. Beam width (at -3dB):
- Vertical (elevation) θε °
- Horizontal θβ °
7. RMS tracking error
- in range < 15 m
- in bearing < 2.5 mrad
- in elevation < 7 mrad
8. Maximum number of tracked targets ≥ 200

4. Typical Detection Ranges interference-free conditions
Operational modes
Antenna
rotation
time
RCS
Detection range , km
interference-free conditions
PD =0.5; PF = 10-6
Long-Range
5 sec.
fighter σ = 2 m2 90
bomber σ = 10 m2
120
surface target (cruiser)
Radio horizon under normal refraction;
100 km under superrefraction
Medium-Range
2 sec.
missile σ = 0,05 m2 18 70
surface target (corvette)
0.8 Radio horizon
Radio horizon under normal refraction
Short-Range 16 50

5. Radar technical capabilities :
Digital generation of multi-beam radiation pattern.
  Automatic detection and tracking (track-while scan):
- air and surface targets;
- fast supersonic missiles;
- small-size high-speed surface targets in strong sea clutter.
A high rate of reaction for the detection of dangerous targets.
  Effective suppression of interference from the sea, rain, underlying surface and dipoles.
 Adapting of surveillance modes to different target and noise conditions.
  Doppler filters set for suppressing clutter from the sea surface, hydrometeors and dipoles.
 Separate processing channels for air and surface targets with adaptive detection thresholds.
High resistance to electronic jamming.
  Detection of bursts on the sea from the projectile breaks.
 Built-in control equipment.
Friend or foe recognition of the detected targets.

6. Radar configuration Active Phase Array Antenna IFF antenna
with digital beamformer,
signal and data processor
IFF antenna
Antenna servo unit with slip- ring and rotary joint
Operating console
(option)
Power supplies unit
Control unit
Radar configuration
Diesel-generator

7. Comparative specifications of air and surface surveillance radars
RI «Kvant»
COAST-APA
Saab
Sea Giraffe AMB
Bandwidth (NATO)
G Band
Instrumented range
16/32/64/128/180 km
30/60/100/180 km
Elevation coverage
16/30/60°
70°
Beamwidtn (Az-El)
1.6°- 5.7°
2°- 7°
Accuracy (Az-El)
0,15°-0,4°
0,2°- 0,6°
Receiving pattern in elevation
Multi-beam with digital beamforming
Number of beams
Up to 12
Up to 4
Transmitter type
Transistor power amplifier in each of phased array rows
TWT
Antenna weight/
other devices weight
850 kg/
280 kg
660 kg /
1270 kg
Consumed power
10 kVA
35 kVA