The Design And Implementation Of Wireless Remote Control Car And Its Control System Based On H.264

Remote control car is more and more being used in various fields by human as a mainpart of wheeled mobile robot. Such as tactical investigation, mine EOD, remote target vehicle,armed combat, etc in military; cleaning, health care, education, security, tour guides, etc incivilian and even in space exploration aspect mobile robot also play an important role：TheUnited States sent "Spirit" and "Opportunity" rover into space in2004and China alsotransmitted "Jade Rabbit" successfully in December2013. The remote control of wheeledmobile robot went through a development process from wired control at first to wirelesscontrol. As computer technology, microelectronic technology and network technology’scontinuous improvement, the mobile robot related technologies have developed rapidly inrecent years, at the same time the realization of mobile robot’s visible remote control bymeans of wireless networks is no longer out of reach.This article will introduce a remote control car based on H.264which communicates bywireless networks and its control system. The system’s input is the image sequence grabbedby the camera on the robot in motion, after compression and encoding, they are sent tospecified computer by wireless networks. The operating staff will see the images shot by theremote control car on PC control platform after decoding. Furthermore, visual and remoteoperation according to the images can also be realized.The system selects a computer equipped with a Linux operating system in authors’laboratory as upper controller. This computer has a fixed public IP which is convenient to theaccess and connection of remote control car. Design and write the console program runningon the upper PC, which will help the operating staff control the car easily. The processingplatform of remote car is ARM development board with ARM1176JZF-S as core. Thisplatform is used to complete the control of network and video capture equipments. Its basicfunction includes network communication to the host computer, video capture, videoencoding, and issue control commands. Choose a four-wheel drive car chassis with servos andmotors as the remote control car’s underlying hardware. The system bottom drive moduleused CAN field bus as a control communication medium between modules on the basis oforiginal drive. To realize this function, the driver module circuit board is designed and draw,meanwhile, welding and debugging is completed. To improve the remote control range, the remote control car is connected to the Internetby the wireless card. As the network bandwidth is higher than radio bandwidth of previous, itis feasible to control the remote car by real time images transmitted by network. H.264iscurrently accepted for its high compression rate and maturing technology. This system adoptsthis coding standard, reduce the video transmission network bandwidth effectively andimprove the real-time performance of the system. The CAN field bus takes real-time,reliability and flexibility to the system for its high communication speed and the simplicity toform a redundant structure.The tests on every aspect after system completion indicates that both the hardware andsoftware can work as design, moreover, it can run in a good condition.In addition, with the improvement of3G technology and the promotion of its business inrecent years, the system also tests the case using3G for communication. It provides a newthought to mobile robot remote control.