Description of the radar set, tactical-technical characteristics
Figure 1: AN/FPS-23, at a main site with two directions
|frequency:||475 … 525 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|average power:||1 kW|
|hits per scan:|
AN/FPS-23 “Fluttar” (flutter radar) was an operaing in UHF-Band gap filler bistatic radar located at Main and Auxiliary DEW-Line Sites to fill the low-altitude gaps between AN/FPS-19 radars. It was a CW-Barriere Radar with separate transmitter (AN/FPT-4) and receiver (AN/FPR-2) sites, typically about fifty miles apart. The AN/FPS-23 uses the Doppler-effect to detect aircraft trying to pass between transmitter and receiver sites. Because of the many false alarms, it had only a less effect.
The first use of the AN/FPS-23 was the old Canadian Line (Mid Canada Line), the predecessor of the DEW line in 1955. These radars were decommissioned by the end of 1963.