Beijing Institute of Tracking and Telecommunication Technology
The detection of ships and other sea targets is of great significance to sea surface management, national defense security, search and rescue and other fields. Space-borne infrared remote sensing has a wide coverage and a short atmospheric path, which is an effective means to achieve wide-area detection of ship targets. Affected by the diurnal cycle of the solar zenith angle, the temperature difference between the ship and the sea surface changes periodically, resulting in a thermal crossover period twice a day in the ship detection scene on the sea surface. In this paper, taking the mid-latitude summer and winter sea surface environment as an example, the 24-hour infrared radiation characteristics of the sea surface ship detection scene are established, and a multi-spectrum optimal combination scheme is proposed, which is realized by the detection of dual detection spectrum bands of 3.50 μm~4.10μm and 10.25μm~10.75μm Day and night continuous observation with signal-to-noise ratio better than 16.52(summer) and 17.64(winter). The proposed dual-spectrum detection method provides technical support for the application of wide-area all-time sea surface target detection.