Surveillance Aircraft SRA-1

The SRA-1 is an airborne surveillance radar system, developed by Motorola, operating in the X-band with an instrumented range of 200 km. It was showcased in 1984 on a modified Grumman Gulfstream III, demonstrating the aircraft's adaptability for military roles. The system, designated SLAMMR (Side-Looking Airborne Modulated Multimode Radar), is designed for long-range maritime patrol, border surveillance, and mapping. It comprises seven main subassemblies: antennas, an antenna switching unit, a receiver/transmitter, a display processor, a display, a control unit, and a signal processor. The antenna system features two yaw-stabilized, slotted waveguide arrays that can be horizontally or vertically polarized, mounted either back-to-back in a single pod or individually in two 16-foot canoe-shaped radomes for an unobstructed view. The US-American version, installed on the Boeing 737/200, is designated AN/APS-135. The SRA-1 also features a moving target indicator (MTI) option for detecting moving targets at ranges up to 148 km, and can record and transmit data to ground stations in real time via a radio link. The SRA-1 program laid the groundwork for a broader range of reconnaissance aircraft based on business jets, such as the General Dynamics EC-37 Special Missions Aircraft (SMA), an EW variant of the Gulfstream V.

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