International Journal of Engineering Technology and Applied Science (ISSN: 2395 3853), Vol. 1 Issue 6 December 2015 Paper ID: IJETAS/DEC/2015/16018 Advanced automotive application based on VHDL & MATLAB for correlation radar (anti-collision system) Vikash Kumar Dwivedi 1 , Sarla Singh 2 , Anil Mishra 3 M-tech scholar 1 , Asst. Prof. JNCT Rewa 2 , HOD JNCT Rewa 3 vkbhabha1@gmail.com 1 , sarlasingh_mits@rediffmail.com 2 , anilmishraec@gmail.com 3 ABSTRACT:- RADARs which is used for road anti-collision system, although recent developments in chip manufacturing technology provides as capability to make it multi-function device such that it can be used for automatic driving system but this is another goal, presently we discuss aspect when a large number of vehicles will use this technology then the interference produced by their signals can totally jam the radar hence it become totally unusable to avoid this problem we analyzed the performance of correlation radar for different PN sequences under interference & noisy condition so that the best PN sequence which can properly work on such conditions can be found. We detect the position and get the identification and status of the obstacles. We compute, in real time, the distances toward the preceding vehicles and allow a high data rate communication for exchange data information between obstacles and measure its relative speed. KEYWORDS:- PN Sequence, PRBS, Anti- collision, Doppler effect. INTRODUCTION The basic principle of operation of primary radar is simple to understand. The implementation and operation of primary radars systems involve a wide range of disciplines such as building works, heavy mechanical and electrical engineering, high power microwave engineering, and advanced high speed signal and data processing techniques. A radar system has a transmitter that emits radio waves called radar signals in predetermined directions. When these come into contact with an object they are usually reflected and/or scattered in many directions. The radar signals that are reflected back towards the transmitter are the desirable ones that make radar work. If the object is moving either closer or farther away, there is a slight change in the frequency of the radio waves, due to the Doppler Effect. Radar receivers are usually, but not always, in the same location as the transmitter. Although the reflected radar signals captured by the receiving antenna are usually very weak, these signals can be strengthened by the electronic amplifiers that all radar sets contain. Radar measurement of range, or distance, is made possible because of the properties of radiated electromagnetic energy. The electromagnetic waves are reflected if they meet an electrically leading surface. If these reflected waves are received again at the place of their origin than that means an obstacle is in the propagation direction. Electromagnetic energy travels through air at a constant speed, at approximately the speed of light, 1. 300,000 kilometers per second or 2. 186,000 statute miles per second or 3. 162,000 nautical miles per second. This constant speed allows the determination of the distance between the reflecting objects (airplanes, ships or cars) and the radar site by measuring the running time of the transmitted pulse. This energy normally travels through space in a straight line, and will vary only slightly because of atmospheric and weather conditions. By using of special radar antennas this energy can be focused into a desired direction. Thus the direction (in azimuth and elevation) of the reflecting objects can be measured. These principles can basically be implemented in a radar system, and allow the determination of the distance, the direction and the height of the reflecting object. One has to resolve two problems with this principle:  prevent a direct connection of the transmitted energy into the receiver (feedback connection),  Assign the received echoes to a time system to be able to do run time measurement.