  Now-a-days, a lot of research is being carried out in the development of USVs
(Unmanned surface vehicles), UAVs (Unmanned Aerial Vehicles) etc. Now in case
of USVs generally, we have seen that wireless controlled vehicles use RF
circuits which suffer from many drawbacks such as limited working range,
limited frequency range and limited control. Moreover shooting infrared
outdoors on a bright sunny day is often problematic, since sunlight can
interfere with the infrared signal. Use of a GSM network (in the form of a
mobile phone, a cordless phone) for robotic control can overcome these
limitations. It provides the advantages of robust control, working range as
large as the coverage area of the service provider in comparison with that of
an IR system, no interference with other controllers. This paper presents a
Global System for Mobile Telecommunication (GSM) network based system which can
be used to remotely send streams of 4 bit data for control of USVs.
Furthermore, this paper describes the usage of the Dual Tone Multi-Frequency
(DTMF) function of the phone, and builds a microcontroller based circuit to
control the vehicle to demonstrate wireless data communication. Practical
result obtained showed an appreciable degree of accuracy of the system and
friendliness through the use of a microcontroller.
