The AN/SPS-55 was a surface search and navigation I-band radar that was designed in 1970 by the firm Cardion Electronics for the US Navy. Capable of detecting targets from 50ft up to 50 miles, the AN/SPS-55 was composed of four units: 1) low-noise receiver/transmitter, 2) box switch, 3) radar set control, and 4) antenna group, which was made up of two waveguide slotted arrays mounted back-to-back. One array of the antenna provided linear polarization and the other provided circular polarization. Polarization was user selectable and the circular polarized array was more effective in reducing returns from precipitation. This linear array antenna could rotate in azimuth at 16 RPM, forming a beam narrow in azimuth (1.5°) and broad in elevation (-10° to +10°, centered on the horizon). The AN/SPS-55 was a solid-state radar system which could generate two selectable pulse widths. The radio frequency was tunable from 9.05 to 10.0 GHz with a minimum peak power out of 130 kW (measured at the magnetron).
Type: solid state I-band radar
Bandwidth: 9,05 - 10 GHz
Pulse repetition frequency: 750 or 2250 Hz
Impulse performance: 130kW
Angular aperture: 1,5° Horizontal; 20° Vertical
Range: 50 miles (80km)
Weight: 262 lb (131kg)