Telenav II

Telenav II is a video data labeling system. It encodes analogue video pictures automatically with GPS position, date, time, course over ground and velocity along with other options such as altitude, attitude and heading. 

The Telenav II system accepts the GPS digital data in an industrial standard format and invisibly inserts the geographic and other information into a video signal, locked to each frame in frequency and time. It does not burn the data into the video frame but inserts the data into the spare video lines of the ‘vertical interval’. In this way none of the video image is lost and audio channels remain free for intended use. 

Telenav II is an ‘intelligent’ system that identifies and adapts the data insertion process so that any other information carried within the video signal is not corrupted or destroyed but carried along without interference. It checks to see if there is already data on the spare video lines and fits around any that it finds. Once ‘encoded’, the video signal is securely and permanently tagged with data. The information is available to the viewer at any time, by playing the encoded video into a Telenav II unit set to ‘decode mode’. Various display formats are possible at the touch of a button and the data is simultaneously output on a serial port (RS232) for interfacing with one of the RTGIS applications.

Using Telenav II it is necessary to use a camera and a separate video recording unit. The camera image is encoded with the GPS signal via the Telenav unit and then recorded on a compact vhs recording unit or even a camcorder unit set to record. The camera is usually mounted outside the vehicle, aircraft, boat or locomotive at a suitable position and attitude to maximize the amount of image information captured. The GPS receiver, Telenav unit and recording unit are internal with easy observation that all is functioning correctly.