Radartutorial .eu Airfield Surveillance Radar ASR-3
Bild 1: Antenna of the ASR-3
(© AEG Telefunken)
Figure 2: ASR-3 Tower at Airport Frankfurt
(© DFS Deutsche Flugsicherung)
Figure 2: ASR-3 Tower at Airport Frankfurt
(© DFS Deutsche Flugsicherung)
The Antenna of the Airfield Surveillance Radar ASR-3 was presented on an exposition in Berlin in 1953. First international installation was on Airport Bombay (India) in 1961.
Plan position indicators (PPI's) with a cathode-ray-tube diameter of 10" were used with rotating deflection coils. Azimuth information was derived from servo control voltages. The radar was fitted with a Moving Target Indication (MTI) system using the Pulse-Pair Processing. As electrical delay lines of this length with a sufficient bandwidth and low attenuation were not available at that time, the echo signals were piezo-electrically transformed into acoustic signals. These acoustic signals passed through a mercury-column and then were piezo-electrically changed back into electric signals. By subtracting the signals from the delayed channel from the actual echo signals fixed targets are cancelled with a subclutter visibility of 15 up to 20 dB.
Figure 3: ASR-3 Tower at Airport Hamburg
(© DFS Deutsche Flugsicherung)
Figure 3: ASR-3 Tower at Airport Hamburg
(© 1958 DFS Deutsche Flugsicherung)
| Specifications | |
|---|---|
| frequency: | 2700 - 2900 megahertzes |
| pulse repetition time (PRT): | 833 microseconds |
| pulse repetition frequency (PRF): | 1200 hertzes |
| pulsewidth (PW): | 0.833 microseconds |
| receive time: | |
| dead time: | |
| peak power: | 500 kilowatts |
| average power: | |
| displayed range: | 54 NM (100 km) |
| range resolution: | 410 ft (1/16 NM) |
| beamwidth: | 2.5 degrees |
| hits per scan: | |
| antenna rotation: | 25 rpm |