INS - GPS integrated aid to partially vision impaired people using Doppler sensor

Abstract

Without vision the human life becomes miserable. The technology should be able to help the people who are having impaired vision to live life as normal human beings. So many navigation aids to such people have been evolved which normally uses only GPS. But GPS satellite signals can't be reached inside the Indore environment, because the waves will be attenuated by structures such as rooftops. Inertial Navigation system (INS) has been used here to overcome this problem. INS is self-dependent which doesn't require any external satellite signals. A speech recognition system is provided to select the location where he wants to go which are predefined and stored. Doppler range finder determines the range between the front obstructing object and the person. As the person moves towards the object the INS gets updated and finds the remaining range. Two vibration motors attached to the person arm will activated based on condition. If he has to take left turn left arm motor will be activated and vice versa. For straight path both motors attached to shoulders will be vibrated. The amplitude of the vibration depends upon the distance between the obstacle object and person.