局域增强系统(L oca l A rea A ugm en ta tion System,LAA S)是美国联邦航空局(F ed era l A v ia tion A d-m in istra tion,FAA)开发的G PS地基增强系统,支持G PS差分精密进近和着陆.多基准一致性检测是LAA S地面完好性监测的核心算...局域增强系统(L oca l A rea A ugm en ta tion System,LAA S)是美国联邦航空局(F ed era l A v ia tion A d-m in istra tion,FAA)开发的G PS地基增强系统,支持G PS差分精密进近和着陆.多基准一致性检测是LAA S地面完好性监测的核心算法.多基准一致性检测通过对伪距校正误差的测试和评估,保证了LAA S地面系统发布的伪距校正量误差不超出一个给定的范围.本文详细讨论了LAA S完好性监测模型中多基准一致性检测算法的B值的含义,并通过实验分析了B值的范围和阈值的选取.结果表明:在正常无故障情况下,B值的大小稳定在一个较小的范围内变化.一旦发生故障,通过阈值的限制就能检测出B值异常的情况.展开更多
A composite target seeker gyro with dual spectral range infrared rays and millimeter waves, and the associated control methodology are developed. The static pressure air floated ball bearing is used to sustain the ou...A composite target seeker gyro with dual spectral range infrared rays and millimeter waves, and the associated control methodology are developed. The static pressure air floated ball bearing is used to sustain the outer frame, the optical fiber and wave guide are used to transmit these two kinds of signals to the rear part of the gyro, and the stator coils are used to get non contact angular measurement. Composite guiding, scanning, tracing and controlling can be achieved, the maximum tracing angular velocity can be as high as 16(°)/s.展开更多
文摘局域增强系统(L oca l A rea A ugm en ta tion System,LAA S)是美国联邦航空局(F ed era l A v ia tion A d-m in istra tion,FAA)开发的G PS地基增强系统,支持G PS差分精密进近和着陆.多基准一致性检测是LAA S地面完好性监测的核心算法.多基准一致性检测通过对伪距校正误差的测试和评估,保证了LAA S地面系统发布的伪距校正量误差不超出一个给定的范围.本文详细讨论了LAA S完好性监测模型中多基准一致性检测算法的B值的含义,并通过实验分析了B值的范围和阈值的选取.结果表明:在正常无故障情况下,B值的大小稳定在一个较小的范围内变化.一旦发生故障,通过阈值的限制就能检测出B值异常的情况.
文摘A composite target seeker gyro with dual spectral range infrared rays and millimeter waves, and the associated control methodology are developed. The static pressure air floated ball bearing is used to sustain the outer frame, the optical fiber and wave guide are used to transmit these two kinds of signals to the rear part of the gyro, and the stator coils are used to get non contact angular measurement. Composite guiding, scanning, tracing and controlling can be achieved, the maximum tracing angular velocity can be as high as 16(°)/s.
