NAVIGATION SYSTEM WITH MONO-CAMERA BASED TRAFFIC SIGN TRACKING AND POSITIONING MECHANISM AND METHOD OF OPERATION THEREOF

A method of operation of a navigation system comprising: receiving multiple frames, including a first frame and a second frame, of images; detecting a traffic sign from the images between the first frame and the second frame based on a sign recognition model; extracting a first image from the first frame and a second image from the second frame; matching the traffic sign is the same in the first image and the second image based on a similarity model; generating a sign location of the traffic sign with an inertial measurement unit reading based on the first image and the second image; and generating a global coordinate for the sign location for displaying on a navigation map.