Navigation using GPS generally requires that the user track four satellites to resolve his 3-D spatial position and time bias. There are several reasons why it is desirable to navigate while tracking only three satellites: -The proposed 18 satellite GPS constellation will exhibit substantial periods of poor four satellite geometry over large geographic areas several times a day. -Failure of a G...

In view of the issue of rapid attitude maneuver control of agile satellite, this paper presents an attitude-tracking control algorithm with path planning based on the improved genetic algorithm, adaptive backstepping control as well as sliding mode control. The satellite applies double gimbal control moment gyro as actuator and is subjected to the external disturbance and uncertain inertia prop...

This paper presents a simple antenna system for land vehicle communication aimed at Engineering Test Satellite-VIII (ETS-VIII) applications. The developed antenna system which designed for mounting in a vehicle is compact, light weight and offers simple satellite-tracking operation. This system uses a microstrip patch array antenna, which includes onboard-power divider and switching circuit for...

A quaternion-based attitude synchronization tracking problem is treated for satellite formation flying without using absolute and relative angular velocity measurements. More specifically, an adaptive control based output feedback attitude synchronization tracking control law is first developed under the requirement of communication links between each satellite in formation and the desired traj...

In this paper the design of a mobile antenna system consisting of a transmitting and receiving sub-systems for Ku band geo-stationary satellite broadcasting and communication is mentioned. A transmitting sub-system plays the role of sending the signal toward the satellite while the receiving sub-system plays the role of receiving signal from the satellite and tracking the target satellite. The ...

In traditional GNSS receiver architectures, the receiver normally acquires the visible satellite signals and keeps tracking them throughout their availability. Although this approach is perfectly viable for reliable and accurate positioning in most applications, tracking all satellites in view throughout the receiver power-on duration results in a significant penalty on power consumption in bat...

Combined with strong tracking filter (STF) theory, the Strong Tracking Square-Root Unscented Kalman Filter (UKF)-based satellite attitude determination algorithm is proposed in this paper. QR decomposition and Cholesyk decomposition are introduced in this paper, which improves the stability of filter. In addition, by introduced adaptive fading factor, the prediction error covariance matrix can ...

--------------------------------------------------------ABSTRACT-------------------------------------------------The project presents recognize of an aircraft in satellite image using template matching for accurate detection and tracking. High resolution multispectral satellite images with multi-angular look capability have tremendous potential applications. Here the system involves an object t...

This paper presents an implementation of predictive functional control for imagebased satellite attitude control. The approach considers Low Earth Orbit small satellites equipped with an on-board camera for interactive Earth observation. The control goal is to keep a target on the Earth surface in the satellite’s camera field of view during orbiting of the satellite above the target. The contro...