Survey on Digital Signal Processing for FMCW Radar

I. Introduction

The Frequency Modulated Continuous Wave (FMCW) radar has numerous preferences over the normally utilized pulse radars and has discovered an assortment of uses. FMCW level radars have been utilized for quite a long time in the regions, for example, route and auto hostile to crash evasion. Attributable to its low transmitting power and high accuracy in range measurement, the FMCW radar is preferably appropriate for level estimation applications and has been utilized for quite a long time. A standout amongst the most interesting highlights of the FMCW level radar is its high precision in range measurement which in order of 1mm. Frequency modulated continuous-wave (FMCW) radars have discovered various applications where the nearness of one target is to be identified. Be that as it may, this kind of radar is more hard to utilize where there are many targets as detection dependent on the analysis of the frequency spectrum of the received signal. No powerful techniques have been created for automatically handling the processing of received signal to identify the targets, particularly if the target return is of an indistinguishable magnitude as clutter level. In prior work, where a FMCW radar was utilized to recognize covered objects the elucidation of the frequency spectrum was performed by visual review of the yield of a spectrum analyzer. Such a technique for translation is for the most part unacceptable. So through this venture we endeavor to discover a strategy for target extraction utilizing advanced digital-signal-processing.

Self-driving cars offer a totally new perspective on the application of the radar technology in the automobiles. Instead of only assisting the driver, the new automotive radars should be capable of taking an active role in the control of the vehicle. As a matter of fact, they will be a key sensor of the autonomous control system of a car.

Radar is preferred over the other alternatives such as sonar or lidar as it is less affected by the weather conditions and can be made very small to decrease the effect of the deployed sensor to the vehicle's aerodynamics and appearance. The Frequency Modulated Continuous Wave (FMCW) radar is a type of radar that offers more points of interest contrasted with the others. It ensures the range and velocity information of the surrounded objects to be detected simultaneously. This information is very crucial for the control system of the self-driving vehicle to provide a safe and collision-free cruise control.

A radar system installed in a car should be able to provide the necessary information to the control system in real-time. It requires to have a base-band processing system which is capable of providing enough computing power to meet the real-time system requirements. The processing system performs digital signal processing on the received signal to extract the useful information such as range and velocity of the surrounded objects.