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Gravity Gradiometry and Map Matching: An Aid to Aircraft Inertial Navigation Systems59,99 €![Perimeter Security and Intruder Detection Using Gravity Gradiometry: A Feasibility Study]( "Perimeter Security and Intruder Detection Using Gravity Gradiometry: A Feasibility Study")
Perimeter Security and Intruder Detection Using Gravity Gradiometry: A Feasibility Study59,99 €![Determination of the Possible Locations of the Receiver on a Passive Coherent Location System, Considering the Effects of the Terrain and the Atmosphe]( "Determination of the Possible Locations of the Receiver on a Passive Coherent Location System, Considering the Effects of the Terrain and the Atmosphe")
Determination of the Possible Locations of the Receiver on a Passive Coherent Location System, Considering the Effects of the Terrain and the Atmosphe59,99 €![An Investigation of the Effects of Boundary Avoidance on Pilot Tracking]( "An Investigation of the Effects of Boundary Avoidance on Pilot Tracking")
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Performance of Military Cargo Aircraft Using Required Navigation Performance Departures59,99 €![Tightly Integrating Optical and Inertial Sensors for Navigation Using the UKF]( "Tightly Integrating Optical and Inertial Sensors for Navigation Using the UKF")
Tightly Integrating Optical and Inertial Sensors for Navigation Using the UKF59,99 €
Recently, Gravity Gradient Instruments (GGIs) - devices which measure the spatial derivatives of gravity, have improved remarkably due to development of accelerometer technologies. Specialized GGIs are currently flown on aircraft for geological purposes in the mining industries. As such, gravity gradient data is recorded in flight and detailed gradient maps are created after post mission processing. These maps, if stored in a database onboard an aircraft and combined with a GGI, form the basis for a covert navigation system using a map matching process. This system is completely passive and essentially unjammable. To determine feasibility of this method, a GGI sensor model was developed to investigate signal levels at representative flight conditions. Aircraft trajectories were simulated over modeled gravity gradient maps to determine the utility of flying modern GGIs in the roles of navigation and terrain avoidance.