ARS-400

The ARS-400 is a multimode airborne maritime radar system operating in the X-band (9.2–9.5 GHz), also known as I-band by NATO. Developed in 1997, it features both surveillance and Synthetic Aperture Radar (SAR) imaging capabilities. In surveillance mode with a rotating antenna, it can track up to 100 sea targets, while its SAR-stripline mode offers a range resolution of 15 meters and an instrumented range of 240 km (130 nautical miles). The system utilizes a pulse compression system with a traveling wave tube transmitter and multichannel signal processing for sea surface target detection, ground mapping, and monitoring of weather and oil pollution. It is typically mounted in a radome beneath the fuselage of maritime patrol aircraft; an upgraded version is designated ARS-800.

radartutorial.eu: https://www.radartutorial.eu/19.kartei/08.airborne2/karte013.en.html