Concept project:

Which sensor shall use?

A small drone similar to which usually use in videos camera shooting from sky.

Assume a drone/robot  on air at a football ground or a plain area of 2sqkm.A lacer light attached to this drone point to an object 2km away from drone and object on the ground.

Need help: When the object move, the lacer light also need to move and point it again to the object in the new location.

 PLC,GSM module and Chat SIM card, and video camera are used to control the drone via message from Android app from anywhere in the world.

The challenge is that which sensor need to select to find the object position change with respect to initial locked location and send analog 4-20mA signal  to the PLC attached to the drone, and archeive the corresponding error signal to PID compact block.

It means which sensor for drone need to select and get an error signal to PLC when target object change.

According to the error signal, PLC output ,stepper and servo motor on the drone again point the lacer to the object.

Could you pls Recommend  a sensor to get signal precision with respect to change in object target position 2km away?

This is for  helping college final yr engineering  project.

Bugler detect and Alarm in a large unmanned farm with lacer beam and lockout with lacer beam and point light for finding trespassers,thief and wild animals by security personnel.

Product expect to available on Amazon

Investors welcome for R&D??

A project for peaceful purpose.who want to discuss?