Is it possible to localize a robot without any sensors, odometer and servo motors?
Assume robot has dc motors and no obstacles.
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If you know the wheel radius and the speed of the robot, you will be able to calculate its location at any time relatively to its initial position.
travelled_distance = Speed * time; current_position = initial_position + travelled_distance;
This is a simplified 1-dimensional equation than can help you. But keep in mind that without sensors and odometry the localization can't be very accurate.