"Intensity-associated remote sensing imaging field test technology" passed acceptance

[China Instrument Network Instrument Research and Development] The 863 Program “Intensity Associated Remote Sensing Imaging Field Test Technology” undertaken by the Institute of Optics and Electronics of the Chinese Academy of Sciences has recently passed the acceptance by the National Remote Sensing Center of the Ministry of Science and Technology, which has laid a solid foundation for the development and application of intensity-related remote sensing loads. Foundation. The tethered balloon system plays an important supporting role.

　　 Intensity-correlated spectroscopic cameras

Different from the point-to-point correspondence mode of existing space-to-image space in existing optical imaging technology, intensity-associated remote sensing imaging technology is a novel imaging method that uses the quantum fluctuation of light field and its correlation to obtain target image information. Technology provides a new technological approach to the breakthrough of the theoretical limits of image resolution and image acquisition efficiency of traditional optical imaging technologies for image information acquisition. With the support of the 863 Program, the Shanghai Institute of Optics and Fine Mechanics under the Chinese Academy of Sciences has taken the lead in constructing the first laser three-dimensional intensity-related imaging engineering prototype in the world.

Intensity-associated imaging technology has great application prospects in the fields of remote sensing, microscopy, and precision guidance. It is urgent to conduct comprehensive test verification in the field. For this reason, the Institute of Optics and Electronics of the Chinese Academy of Sciences undertook the 863 Program “Intensity Associated Remote Sensing Imaging Field Comprehensive Testing Technology” project in 2014. The goal is to promote the engineering verification process based on the prototype of the passive optical hyperspectral intensity correlation principle. Supporting its implementation on the application platform for actual flight experiments, breaking key technologies based on the strength of the aircraft platform associated with remote sensing imaging, realizing the optical intensity related remote sensing imaging spanning from the field static scene to the aviation aerostat platform; Compared with traditional optical imaging technology, imaging technology has some unprecedented new remote sensing imaging capabilities. It has completed the application of strength-related remote sensing imaging technology theoretical system construction.

Tether balloon platform breakthroughs in key technologies

After a comprehensive demonstration, the research team chose the captive balloon as a test loading platform for intensity-linked cameras. The mooring balloon is a non-powered floating vehicle. It is connected with the ground facilities by tethers. The ball is filled with helium gas and hovering in the air by buoyancy. The mooring balloon system is generally composed of spheres, mooring lines, mooring facilities, measurement and control, and power supply. Tethers are designed to restrain the balloons from staying at the desired height, with wires and optical fibers inside them. The former provides power for various loads carried by the balloons, and the latter transmits the information obtained by the sensors to ground receiving stations. Because tethered balloons are mostly powered by ground facilities, their battery life is not limited by energy, and they have significant advantages over other aircraft. The life of small captive balloon systems can last as long as 1-3 days. The stay-in-balloon system's continuous air time can exceed 15 days.

In the three-year research period, the Institute has broken through the lightning protection of the tethered balloon, dynamic analysis of the ball under complex conditions, ball-mounted uninterrupted power supply, ball-mounted on-line charging, ball-mounted pulsed high-power discharge power supply, and tethered cable Many key technologies such as active control of cable harvesting, successfully developed a 1600 cubic meter mobile earth-to-ground observation tethered balloon system with a payload of over 250kg, a lift height exceeding 2000m above sea level, a data transmission speed of more than 1Gbps, and wind resistance exceeding 24m/ s, reaching the domestic advanced level.

The Institute of Optoelectronics completed a data acquisition flight test for a tethered balloon platform equipped with passive optical intensity correlated imaging payloads at different altitudes. The data obtained included the fan-shaped, grayscale, colored, and stripe targets manually deployed by the project team, as well as trees, houses, and Cars and other natural scene targets, for the first time in the country, achieved intensity-dependent imaging loads for outfield imaging on an aerial remote sensing platform, verifying that the Tethered Balloons Scientific Experimental Platform developed by the Institute of Optoelectronics is highly accurate, stable, High-rate real-time data transmission, high-quality power supply, high-precision attitude measurement and other aspects of reliable support capabilities.

Field test to achieve the expected results

In November 2017, the project of "Intensity-related remote sensing imaging field testing technology" successfully passed the review and acceptance of the expert group. The review panel believes that this project has broken through the field performance test standard target, adaptive high-performance compressed sensing correlation reconstruction, high-power ball Containing key technologies such as power supply and stable platform flexible precision transmission control, the first set of staring load field comprehensive test system in China was constructed, and three large-scale comprehensive field test tests were successfully implemented to lay a foundation for the development and application of intensity-related remote sensing loads. solid foundation. The research results of the project will be incorporated into the National High Resolution Remote Sensing Integrated Calibration Field, serving the research and development of new remote sensing loads in China, analysis and verification of imaging application models, and further promoting the development of China's Earth observation technology.

Tethered balloons are important members of the family of floating vehicles. Under the guidance of the older generation of scientists, such as Academician He Zehui, the Chinese Academy of Sciences began to develop floating aircraft as early as 40 years ago. It now has high-altitude zero-pressure balloons, over-pressure balloons, captive balloons, low-middle-air airships, and stratospheres. Airship development capabilities. Floating aircraft has a wide range of uses. The first hard X-ray telescope in the world, which was successfully launched in June last year, was named “Eye of the Eye” to commemorate Mr. He Zehui. Before that, high-altitude ball was used to carry hard X-rays. The device verifies the technical feasibility.

The mooring balloon of the Aerospace Research Center of the Chinese Academy of Sciences was developed by independent innovation from 1988. In 1989, the “Hainan One” mooring balloon system was successfully developed. It has a volume of 150 cubic meters and is the first practical type in China. Tether balloon system. In 1995, it successfully developed a prototype balloon system with a capacity of 400 cubic meters. In 1996, it completed the development of a vehicle-mounted mobile tethered balloon system. In 2009, it developed the largest tethered balloon warning system in China and delivered it to users. In December 2016, the The KX-10 mooring balloon was equipped with the exploration ship No. 1 to carry out a three-dimensional observation test at sea. It was the first domestic mooring balloon application test. In September 2017, the "Science and Technology Service Network Program (STS) - Advanced Aerodynamics Manufacturing and Applications" project of the Chinese Academy of Sciences completed the demonstration flight application. The "mobile mooring balloon" participating in this flight test can be quickly expanded. The sub-system stays in the airspace for up to 3 days. It meets the requirements for quick deployment of monitoring, communications, and other applications. It has achieved the goals of strong mobility, system reliability, and ease of use and operation. In December 2017, the KX-15 Tethered Balloon Infrared Observation System of the Photoelectricity Institute was first launched into the nook area of ​​Kekexili at an altitude of 4,700 meters to observe and study animal behavior in the protected area.

The Aerospace Aerospace Team of the Chinese Academy of Sciences possesses a software and hardware platform for structural modeling, large-scale structural analysis, thermal analysis, and aerodynamic analysis, and a group of high-level scientific and technical personnel who have long been engaged in research on rigid structures, flexible structures, thermal analysis, and aerodynamic characteristics. Aerospace research and design work. The mooring balloon system technology has been relatively mature and has formed series of mooring balloons, codenamed KX-10, KX-14, KX-15, KX-31, KX-47. The Institute of Optoelectronics will continue to closely integrate its own professional characteristics of optoelectronics, and will provide technical support for the frontier scientific exploration of the Academy of Sciences and play a more important role in the main battlefield of the national economy.

(Original title: Extending the verification capabilities of floating platforms to help explore the frontiers of photovoltaic loading—Remember the application of the Tethered Balloons of the Chinese Academy of Sciences in comprehensive testing of intensity-related spectroscopic cameras)