With much of the military and civilian communities becoming dependent on GPS technology to navigate, it has become imperative that the navigation systems be tested in situations in which GPS does not work. This testing is especially necessary for precise tasks such as landing an aircraft. Currently, research is being conducted into using a pseudolite-based reference system to use as a truth model for the GPS jamming test. Pseudolite systems have been proven to provide sub-centimeter level accuracy in the horizontal plane; however in the vertical plane the position error is still in the decimeter to meter level range. This is largely due to the fact that the geometry of a ground based pseudolite system provides poor slant angles in the vertical plane, which contributes to large positioning errors. The goal of this research is to study the effects of system geometry on the vertical plane solution. The results of this effort show that elevation angles of greater than 20o-30o are necessary to attain reasonably good positioning solutions. Multiple pseudolite deployments, while effective at reducing the geometry errors, are very cost ineffective and the geometries pose significant risks to a landing aircraft. The best geometry involved using an orbiting aircraft, with a pseudolite transmitter and receiver attached, as an elevated pseudolite to create better slant angles and thus better positioning solutions.
Optimal Geometric Depolyment of a Ground Based Pseudolite Navigation System to Track a Landing Aircraft
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Description
With much of the military and civilian communities becoming dependent on GPS technology to navigate, it has become imperative that the navigation systems be tested in situations in which GPS does not work. This testing is especially necessary for precise tasks such as landing an aircraft. Currently, research is being conducted into using a pseudolite-based reference system to use as a truth model for the GPS jamming test. Pseudolite systems have been proven to provide sub-centimeter level accuracy in the horizontal plane; however in the vertical plane the position error is still in the decimeter to meter level range. This is largely due to the fact that the geometry of a ground based pseudolite system provides poor slant angles in the vertical plane, which contributes to large positioning errors. The goal of this research is to study the effects of system geometry on the vertical plane solution. The results of this effort show that elevation angles of greater than 20o-30o are necessary to attain reasonably good positioning solutions. Multiple pseudolite deployments, while effective at reducing the geometry errors, are very cost ineffective and the geometries pose significant risks to a landing aircraft. The best geometry involved using an orbiting aircraft, with a pseudolite transmitter and receiver attached, as an elevated pseudolite to create better slant angles and thus better positioning solutions.
Current flight reference systems rely heavily on the Global Positioning System (GPS), causing susceptibility to GPS jamming. Additionally, an increasing number of tests involve jamming the GPS signal...
This research effort examines the reduction of error in inertial navigation aided by vision. This is part of an effort focused on navigation in a GPS denied environment. The navigation concept...
Introducing the principles of communications and navigation systems, this is ideal for students on an EASA and FAR-147-approved course in aerospace engineering. This new edition offers an overview of...
The high accuracy of the Global Positioning System allows for precision navigation in support of current and future military operations. However, generating a three-dimensional position using GPS...
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