【智能系统】航天器绕飞逼近翻滚目标运动再现的姿轨控制

LECTURE OUTLINE Overview of environmental effects of aircraft Aircraft noise – Impacts and regulatory issues – Technology trends Aircraft pollutant emissions – Impacts and regulatory issues – Technology and emissions trends Summary and references

Outline Lifecycle cost Operating cost Development cost Manufacturing cost Revenue Valuation techniques

Gordon mckinzie Manager, New Aircraft Development United airlines I joined United Airlines in 1967 and am presently Manager of New Aircraft Development, a post I have held since 1987. Assignments at United have included

Basic atmospheric structure mosphere Troposphere is 2 100 where the temperature stops decreasing in the tmosphere(10 km altitude)

Propagation Basics: - Signal, tagged with time from satellite clock, transmitted. - About66msec(20,000km) later the signal arrives at GPS receiver. Satellite has moved about 66 m during the time it takes signal to propagate to receiver

Specific common processes White-noise: Autocorrelation is Dirac-delta function; PSD is flat; integral of power under PSD is variance of process(true in general) First-order Gauss-Markov process (one of most models common in Kalman filtering)

Estimation · Summary Examine correlations -Process noise · White noise · Random walk First-order Gauss Markov Processes Kalman filters Estimation in which the parameters to be estimated are changing with time

Basic concepts Basic problem: We measure range and phase data that are related to the positions of the ground receiver, satellites and other quantities How do we determine the \ best position for the receiver and other quantities What do we mean by best \ estimate?

Summary · Review: -Examined definitions of pseudorange and carrier phase Looked at some actual raw measurements from a RINEX file Today we look at: