Study Of Real-time Localization Radio Beacon Key Technology In Dynamic Environment

Aerospace systems require trial and error before the device launch to ensure its normaloperation, the experiment various parameters that were stored on the onboard memory. Butthe rocket drop zone a wide range, with memory flying fast, location complex, more difficultto find memory.This dissertation presents a memory recovery system for rocket data logger in dynamicenvironment. The program began when the memory down to the ground after landing. Systemincludes a transmitter wireless beacon together with the memory, ground handheld networkdevice and search device in UAV. The approach to wireless assisted GPS positioning-basedpositioning. Radio beacon transmitter transmits the GPS information in real time duringlanding using the spread spectrum technique, the ground network and UAV search equipmentget the memory trace, so we can seeking to achieve memory quickly.In this dissertation, by analyzing the whereabouts of the flight path of the rocket bodyand memory trace, we design whole workflow. Beacon itself positioning by receiving GPSinformation in dynamic environment and navigation information is sent to receivers on theground to extract the network via a wireless form. For the problem Doppler frequency shift indynamic environment, we design two systems which can transmit a single frequency signaland spectrum signal, after experiment we select the last one. By designing repeatedly transmitthe data transmission, reduced the probability of loss of information. Ground receivers acquireand track the program signal by using the frequency extension to improve reception. In orderto improve GPS signal reception we select conformal micro-strip antenna, system rangingassisted wireless positioning technology to improve system reliability, and at last made a highoverload and high temperature resistant method. Conducted experiments on a variety ofsystem conditions plains, mountains and sky, through the analysis of the experimental results,the system is stable and reliable. Update rate GPS data can meet the fast-moving objects test requirements, by connecting points into a line depicts the trajectory of the object to achieverapid recovery of rocket data logger.