Real-time position control plays a crucial role in a successful plasma operation. For a shaped plasma, vertical instability, and hence its control, is mandatory for achieving the expected plasma parameters. In this work, real-time position control is demonstrated using an appropriate feed system that uses optical signals as input. First, the appropriate location for collecting visible radiation for accurate estimation of the horizontal and vertical plasma column positions is identified by post-processing the data from a fast imaging camera and benchmarking it with existing magnetic and spectroscopic measurements. To validate the authenticity of the obtained locations using camera images, an independent optical diagnostic system involving a pair of photodiodes is developed and installed to collect emission from those locations. Fairly accurate real-time estimation of the vertical plasma column position is demonstrated using the pair of photodiodes for limiter plasma operation in Aditya-U. The entire study reveals several facts, including the crucial aspects for an appropriate choice of location for radiation collection for accurate determination of the plasma column position using a non-magnetic measurement.