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VISNAV is Vision Based Sensor and Navigation System for Autonomous Aerial Refueling
Now a days there are several navigation systems for positioning the objects. Several research efforts have been carried out in the field of Six Degrees Of Freedom estimation for rendezvous and proximity operations. One such navigation system used in the field of Six Degrees Of Freedom position and attitude estimation is the VISion based NAVigation system. It is aimed at achieving better accuracies in Six Degrees Of Freedom estimation using a more simpler and robust approach.
VisNav Sensor Systems

The Texas A&M team has engaged in significant sensor and sensor fusion research over the past few years One focus of our sensors and sensor fusion work has been to address the demands of real-time, high resolution, and high reliability systems; we seek optimal integrated designs of advanced sensors, fusion algorithms, and computing architectures to solve particular set of problems. The integration of sensor design, sensor fusion algorithms and advanced computing results in a class of embedded systems we refer to as smart sensors. VisNav, our vision based navigation sensor suite has a special mention among our sensor results. StarNav, one of Texas A&M's other navigation solution is described here


VisNav came in to being, with a primary objective of enabling (anticipating a worst case scenario) a single sensor to provide full 6 degree of freedom relative navigation of two air vehicles “ with sufficient precision and bandwidth to enable the challenging goal of fully autonomous air refueling. A second objective was to achieve an extremely robust navigation solution. We have fully achieved these goals in ground demonstrations, and the flight experiment program is presently mid-stream. We mention that the small mass (<1 kg) and low power (< 20 watts) of this modular sensor design allows obvious paths to dual and higher parallel redundancy architectures..


Flight Test Demonstration Program :

To validate and demonstrate the Autonomous Air Refueling System (AARS), composed of the VisNav relative navigation sensor, and the Reference Observer Tracking Controller (ROTC) control laws, both developed by our team, we conducted the following flight test program. The program is being conducted from 3 April 2006 “ 31 October 2007 at the Flight Mechanics Laboratory, under sponsorship from FRL/MN and Boeing, under sub-contract to StarVision Technologies. Fight testing of the first vehicle began in June 2006, and is still proceeding. To date, more than 10 validation and verification flights of the tanker and receiver have been conducted. The first air-to-air docking of the tanker aircraft and the receiver aircraft, without human supervision or intervention, is scheduled for 2nd Quarter 2007.