SEMINAR ON VISNAV : Now 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.
The VISNAV system uses a Position Sensitive Diode (PSD) sensor for 6 DOF estimation. Output current from the PSD sensor determines the azimuth and elevation of the light source with respect to the sensor. By having four or more light source called beacons in the target frame at known positions the six degree of freedom data associated with the sensor is calculated.
Marking channel separation and demodulation are performed in a fixed-point processor (DSP) from Texas Instruments TMS320C55x [2] digital down conversion, synchronous detection and multirate signal processing techniques. The sensor demodulated flows resulting from each tag sent to a floating point DSP Texas Instruments TMS320VC33 [2], the next navigation solution using the colinearity equations. Other competitive systems [3] The difference in the world Positioning System (GPS) is limited to mid-range accuracy and low bandwidth, and require complex infrastructures. Sensor systems based on differential GPS is also limited in the geometric dilution accuracy, multipath errors, receiver errors, restrictions may be etc.These
overcome by using an embedded DSP VISNAV

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