Small Flying Objective In Low-altitude Airspace Dynamic Monitoring Methods And Experimental Platform

With the gradual opening of Low-altitude airspace, more and more activities enter into Low-altitude airspace. The traffic conditions become more complex in Low-altitude airspace. In order to maintain the order in Low-altitude airspace to ensure the safety of aircrafts, it is necessary for monitor aircrafts in Low-altitude airspace. The main aircraft in Low-altitude airspace are civilian aircraft, if the monitoring cost is too high, the civil aircraft may be unable to afford, it will affect the promotion of the whole monitoring system. Considering characteristics of civil aircraft at low, slow, small target, a better security, stable, and cost more low in dynamic monitoring methods and experimental platform is proposed based on GPRS network and embedded technology.The experimental platform is consisted of terminal in aircraft and monitoring center. This thesis studies the design of terminal in aircraft and the communications between terminal in aircraft and monitoring center. Terminal in aircraft is based on ARM kernel S3C44B0X and embedded operating systemμC/OS-Ⅱ. It can do data processing and controling, besides that it should complete communication with monitoring center by GPRS model MC55. The communication is completed by GPRS and internet based on IP data transmission. In the experimental platform based on hardware and software and telecommunications networks, this paper proposes the concept of Three-dimensional fence, and its working methods and the corresponding communication protocol.The thesis studies the key problems of technologies involved in the design, development and application of monitoring system, and provides the proper method of solving the problems in the problem. The thesis is mainly composed of five parts:firstly, technology and applications of GPS is introduced; secondly, the reason for the choose of the communication system design and the correlated technologies are briefly presented including GPRS, MC55 and AT command; thirdly, the hardware design based on S3C44B0X and modular design is introduced; fourthly, the function and transplant of software platform embedded operating systemμC/OS-Ⅱis introduced; fifthly, Three-dimensional fence design, working methods and the corresponding communication protocols based on the hardware and software platform is proposed. Finally, the extended function of the system and the further research direction are proposed.