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[ Page1 ]What is COBRA? /Development purpose of COBRA [ Page2 ]Features of COBRA [ Page3 ]Locations of the COBRA system and Network Link/Main specifications of the COBRA main radar [ Page4 ]Principles of Bistatic Radar Network [ Page5 ]dvantages of a Bistatic Radar Network [ Page6 ]Area of Bistatic Radar Network Observation [ Page7 ]Signal processing/Data Validation [ Page8 ]Operational mode/Example of COBRA Observation

Locations of the COBRA system and Network Link

Locations of the COBRA system

Locations of the COBRA system

COBRA consists of a main radar in Nago City in the northern part of the Okinawa main island and two bistatic receivers-one at the Okinawa Electromagnetic Technology Center (NICT Okinawa) and one at the Ogimi Wind Profiler Facility. The main radar and bistatic receiver stations are located deep in the mountains of Nago and Ogimi, and since they cannot be accessed during typhoons, they are unmanned; instead, they are remotely controlled from NICT Okinawa.

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Network Link

The main radar and the bistatic receivers are connected via networks, and the main radar and NICT Okinawa are connected by a 100-Mbps Ether. All data observed by the COBRA are stored in the Subtropical Environment Remote-Sensing Network & Data System.

Link to the Subtropical Environment Remote-Sensing Network Data System

Network Link


Main specifications of the COBRA main radar

Radar System Monostatic pulse Doppler radar
Frequency 5,340 MHz (C band)
Peak Power ≥ 250 kW (2 klystron units)
Pulse Width select from 0.5 microsecond, 1.0microsecond, 2.0 microsecond
Pulse Repetition Frequency 250-3,000 Hz, set in steps of 1 Hz
Antenna Diameter 4.5 m (parabolic)
Beam Width ≤1.1°
Radome Diameter 8m
Cross Polarization Ratio ≥ 36 dB (integrated value in a beam)
Antenna Gain ≥ 42 dB (including radome)
Side Lobe Level ≤ -25 dB (one-way)
Antenna Scan Speed Horizontally: 0.5-10 rpm (set in steps of 0.1 rpm)
Vertical: 0.1-3.6 rpm (set in steps of 0.1 rpm)
Polarization horizontal, horizontal, vertical, ±45°linear-tilt, right- and left-handed circular


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[ Page1 ]What is COBRA? /Development purpose of COBRA [ Page2 ]Features of COBRA [ Page3 ]Locations of the COBRA system and Network Link/Main specifications of the COBRA main radar [ Page4 ]Principles of Bistatic Radar Network [ Page5 ]dvantages of a Bistatic Radar Network [ Page6 ]Area of Bistatic Radar Network Observation [ Page7 ]Signal processing/Data Validation [ Page8 ]Operational mode/Example of COBRA Observation

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