The Research For The Testing Device Of Ejection Experiment Based On GPS

GPS (Global Positioning System) has been used in many fields of engineering measurement widely, but the application base on GPS in the measurement for ejection escape testing in our country is a blank. Along with the modernization of GPS, GPSâ…¢will replace the current GPSâ…¡, and its measurement precision and practicability will be improved enormously. Seizing the great opportunity to develop a testing system based on GPS, which can be applied to ejection escape testing in our country, is so important that it will enhance test means and test accuracy.In this dissertation, the application of photoelectricity measuring technology and telemetry technology in the ejection testing are expounded, the signal structure of GPS, the theory of GPS receiver and the technology of GPS-RTK( real time kinematic) are introduced. By analyzing and comparing the photoelectricity measuring technology and telemetry technology used in the ejection testing, a project of testing device for ejection experiment based on GPS is put forward. The system is composed of a base station, a data processing computer and a testing device in the space. The raw experimental data is stored in the base station and downloaded to the computer. GPS- RTK is used to manage the data, and the experimental result is given in the dissertation.In this dissertation, the design and realization of the testing device on the space is emphasized, including the software and the hardware. The hardware includes NOVATEL superstarâ…¡receiver, Cygnal Corporation C8051f320 singlechip and ST Corporation M25P16 flash storage, The functions,capability and use method of main hardware are discussed. The C8051f320 singlechip'software is designed and introduced according to the function,capability and request of the testing system, and the software of upper computer is introduced simply. The langue of the program used in C8051f320 singlechip is C51 langue, while upper computer uses Visual C++.Through repetitious test in steady state and dynamic state and analyzing the experimental data, the results show that the position precision is within 1 m, velocity precision is less than 0.1 m/s. The testing system based on GPS is basically up to the ejection escape testing requirement so that it would be a measure means for ejection escape testing. Its realization would offer a new means to test the performance of our country's ejection escape seat in the future.