Abstract: Microwave remote sensing can be achieved throughout all-day and all-weather land observation. So, the microwave technology has certain advantage in forest fire detection field. In this paper, in order to determine the fire happening region, the theories of microwave radiation and receiving were analyzed, and broadband microwave receiver system solution was designed. So as to meet the needs of emergency and flexibility detection, UPS receiver module and inertial navigation unit in low-altitude platform were designed to ensure the reliability and stability of microwave forest fire detection.

Key words: Microwave, Fire detection, Low-altitude aircraft platform