Resources Contact Us Home Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE     Frequency hopping data link approach to autonomous GPS denied relative navigation determination Image Number 2 for United States Patent #8010287. The present invention is directed to accurate GPS (global positioning system)-free relative navigation between an unmanned aerial vehicle (UAV) and a tanker aircraft. The UAV transmits a signal which is received by an antenna array at the tanker aircraft. Horizontal relative position of the UAV is determined by calculating range and bearing based on time and phase differences in the received signal. Vertical relative position of the UAV is determined by comparing the altitude of the UAV with the altitude of the tanker aircraft. The tanker aircraft then transmits a navigation solution based on the relative position of the UAV which is received by the UAV. The UAV may utilize the navigation solution transmitted by the tanker aircraft as a backup to a GPS determined navigation solution, in a GPS denied scenario, or in combination with an INS (inertial navigation system) determined navigation solution.       Recently Added Patents Camshaft variator device Engineered fuel feed stock Peripheral control module, computer system, and operation method thereof Securing out-of-band messages Fuchsia plant named `Sanifminiho` Magnetic disk drive and method for controlling microactuator in magnetic disk drive Printing apparatus, printing method, and computer-readable storage medium for implementing the printing method   Randomly Featured Patents Process for forming a peelable seal Roof core cutter Rear light for a motor vehicle Motion assistive device and maintenance management system for motion assistive device Solarizaton resistant and UV blocking glass Reproducible matrix switch settings of a video signal processing apparatus Face down lounge chair Appliance locking device Egg-filled food product Mounting bracket © 2006-2008 PatentGenius. All Rights Reserved.