ONWA Pulse Compression Radar

KRA-R25W Radome Antenna and KRA-A50W_4 Open-array Antenna

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Specification
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ONWA Pulse Compression Radar delivers cutting-edge marine navigation technology, combining long-range detection, high-resolution imaging, and exceptional reliability. Designed for modern vessels, it ensures safer journeys by detecting obstacles, other ships, and weather formations with precision. Fishermen and commercial operators alike benefit from its advanced pulse compression technology, which enhances target distinction even in crowded or challenging sea conditions. Built to endure harsh marine environments, the radar boasts corrosion-resistant materials and durable construction. ONWA's solution integrates seamlessly with existing navigation systems, offering real-time monitoring and simplified controls. Case studies highlight vessels improving safety and operational efficiency using ONWA radars across coastal and offshore applications. With its innovative features, ONWA Pulse Compression Radar sets a new standard for maritime safety and navigation performance.

Characteristics
Environmental	IEC60945: 2002 Operating Temperature: -25° to +55°C (-13° to +130°F) Relative humidity: +35° C (95° F), 95% RH Waterproof: IPX6
Max relative wind velocity	Max relative wind velocity
Power
DC input	10.5-31.2 V with reverse polarity protection
Power consumption	Operating: 17-29 W (Range/mode dependent) Standby: 3.9 W (Typ.) at 13.8 V DC
Recommended fuse rating	5 A
Dome radar weight (no cable)	5.9 kg (13.0 lbs)
Radar And Antenna Parameters
Radar ranges	36 NM
Rotation speed (mode dependent)	20 - 60 rpm (mode and MFD dependent)
Transmitter frequency	X-band - 9.4 to 9.5 GHz
Transmitter source (warm-up time)	No Magnetron – all solid state. Instant On
Plane of polarization	Horizontal Polarization
Transmitter peak power output	25 W
Minimum range	6 m (19.7 ft)
Sweep repetition frequency	700-2400 Hz (mode dependent)
Pulse length	0.04 - 64 usec +/- 10%
Sweep bandwidth	48 MHz max
Horizontal beam width (Tx and Rx antenna)	4.9° nominal (-3 dB width)
Target Separation Control	OFF: 4.9°+/-10% (-3 dB width nominal) LOW: ~4.3°+/-10% (-3 dB width nominal) MED: ~3.2°+/-10% (-3 dB width nominal) HIGH: ~2.5°+/-10% (-3 dB width nominal)
Vertical beam width (Tx and Rx antenna)	25° (-3 dB width nominal)
Side lobe level (Tx and Rx antenna)	Below -18 dB (within ±10°); Below -23 dB (outside ±10°
Noise figure	Less than 5 dB nominal
Communications/Cabling
Protocol	Ethernet 100Base-T
Max. interconnecting cable length	30 m (98.5 ft) – available as option

KRA-R25W Specification

- KRA-R25W Dome Radars Installation Manual
- KRA-A50W_4 pulse compression radars Installation Manual

Environmental
Operating temperature	-25°C to 55°C (-13°F to 131°F)
Storage temperature	-30°C to 70°C (-22°F to 158°F)
Relative humidity	IEC60945 Exposed product
Vibration	IEC60945 Exposed product
UV	IEC60945 Exposed product
Waterproofing	IPX6 for the pedestal and antenna IPX5 for the RI-50 interface module
Relative wind velocity	KRA-A50W_4 radars with 3 ft, 4 ft or 6 ft antenna have a wind rating of 80 knots at 48 rpm in both 24V and 12V systems.
Power
Power consumption	235 W (peak, 12V) at maximum wind velocity 380 W (peak, 24V) at maximum wind velocity 45-60 W (average) at zero wind velocity 11 W (average) in standby mode Refers to RI-50 input terminals
DC input	12 or 24 V DC into the RI-50 12 volt system limits: 10.8 V DC to 15.6 V DC 24 volt system limits: 20 V DC to 31.2 V DC Pedestal voltage input is 50 V DC nominal generated by RI-50
Power up time	30-40 seconds from POWER OFF to TRANSMIT
Physical
Height	429 mm (16.88”) with antenna mounted
Antenna turning circle diameter	3 ft model: 3.75 ft / 1142 mm / 44.96” 4 ft model: 4.73 ft / 1443 mm / 56.81” 6 ft model: 6.72 ft / 2047 mm / 80.59”
Component weights	Pedestal Antenna 3 ft Antenna 4 ft Antenna 6 ft RI-50 10 m (33 ft) cable 20 m (66 ft) cable 30 m (100 ft) cable	20.3 Kg (44.8 lb) 4.1 Kg (9.0 lb) 4.9 Kg (10.8 lb) 6.5 Kg (14.3 lb) 1.6 Kg (3.5 lb) 1.6 Kg (3.5 lb) 3.2 Kg (7.1 lb) 4.7 Kg (10.4 lb)
Antenna
Rotation speed	16 to 48 rpm depending on operating mode.
Beam width	3 ft model: 2.4°+/-10% (-3 dB width) – 1.7° with Beam sharpening mode on. 4 ft model: 1.8°+/-10% (-3 dB width) – 1.3° with Beam sharpening mode on. 6 ft model: 1.2°+/-10% (-3 dB width) – 0.8° with Beam sharpening mode on.
Beam width vertical	25° +/-10 % (-3 dB width)
Plane of polarization	Horizontal polarization
Side lobe level 3 ft	Below -23 dB max. (within ±10°) Below -30 dB max. (outside ±10°)
Side lobe level 4 ft	Below -23 dB max. (within ±10°) Below -30 dB max. (outside ±10°)
Side lobe level 6 ft	Below -23 dB max. (within ±10°) Below -30 dB max. (outside ±10°)
Radar
Peak power output	50 W ± 10% under any transmit condition – up to 10% duty cycle max
Transmitter	Solid state module with no long-term transmitter power degradation.
Transmitter frequency	Synthesized - Upper half of X-Band 9.390 - 9.495 GHz
Pulse length/PRF and compression ratio	Pulse length: 0.04 usec Chirp length: 2-64 usec Chirp bandwidth: 2-48 MHz Up to 1 pulse and 4 chirps in a burst with burst repetition rate of 500 -3000Hz. Range and mode dependent. Effective pulse compression ratio less than 150 in all modes
Instrumented range	KRA-A50W_4 (all antenna sizes)	72 nm
SART/RACON triggering	Yes – trigger distance: about 1nm max – weather, sea state,and SART position dependent

Duplexer	Circulator and isolator
LNA	GaAs front-end
IF section	Center frequency: 31.25 MHz Bandwidth: 50 MHz max.* A/D; 16 bit 125 MSPS *Narrower bandwidths defined by signal processing
Noise figure	5 dB (Min) at antenna input
Compass safe distance	Pedestal	Standard compass: 1.0 m (3.3 ft) Steering compass: 0.5 m (1.6 ft)
	RI-50	Standard compass: 0.1 m (0.33 ft) Steering compass: 0.1 m (0.33 ft)
Other
Communication ports	Ethernet 10/100 Base-T RJ-45 for radar data and control
Transmit synchronization	RS-422 output
Remote power on	Yes
Antenna park hold	Yes (while radar is unpowered)
Motor	Brushless with solid state commutation with electromagnetic braking for parking
Interconnecting cable	Available in 10 m (33 ft), 20 m (66 ft), 30 m (100 ft) lengths. 20 m (66 ft) length cable included with unit. Options for cable to exit from rear of pedestal or pole mount.