Design And Solution Of Unmanned Low-altitude Remote Sensing System

Almost all the photogrammetry units are in the state of "measure" without "photography". High-precision topographic mapping of small areas is always done manually. As a new remote sensing platform, UAV received extensive attention and research. In this paper, unmanned low-altitude remote sensing system is proposed based on the requirements of ultra-high-resolution aerial imagery in small area mapping (1:500,1:1000). The main work has been done includes:1) To warding the main objects of unmanned low-altitude remote sensing system, the system's standard flight heights and cruising speed are got through analyzing the relationship between image resolution, mapping scale, pixel displacement, and cruising speed. The feasibility of the cruising speed under standard flight height are also demonstrated using Reynolds numbers.2) Main factors of the unmanned low-altitude remote sensing system are analysed. Quantificational design specifications have been proposed. Using the present theory and method, analysis and design of parameters such as aerodynamic layout, lift-to-drag ratio, take-off weight, thrust-to-weight ratio, wing load, engine type, and other components parameters are completed based on the existing productions and experience.3) The requirements of aerial photography, fly safety and workload on the system stability are analysed. System parameters like arm of force and dimension of tail are designed particularly. The relationships between base-height ratio and longitudinal view field angle, longitudinal view field angel and wheel-distance, lateral view field angle and wheel-distance are demonstrated. The technical parameters of take-off and landing device are designed.4) Based on the similar power capability theory, the system prototype is developed after the study on test aircraft.The prototype testing program is designed through engineering projects, and ultra-high-resolution aerial images according to large scale mapping requirements are acquired. Exprimental results demonstrate that the proposed design methods are feasible.Finally, summarization and prospect are given.