Abstract
This paper describes research which has been conducted at inrets and the Institut d'electronnique et de micro-électronique du Nord into road traffic applications of microwave detectors, which are known as collision warning systems. The main purpose of such systems is to improve driver safety by giving a danger warning. The paper begins with a description of the principles of the system and describes the various mock-ups which have been built inrets. These consisted initially pulsed radars at 10 and 60 GHz and then a 60 GHz linear frequency modulated continuous wave radar. Subsequently, frequency modulated and pulsed radars, which complement each other well, were combined in what we have termed a dual mode radar, which although it covers all the required distances is nevertheless costly. This led us to undertake a theoretical study of a last type of radar based on binary coding using pseudorandom sequences and a correlation receiver. Finally, a 10 GHz prototype based on a Digital Signal Processor ( dsp) has been able to solve the cost problem. It is accurate to within about two metres over all required distances. The system is able to discriminate between several obstacles and recognize them on the basis of their radar cross section.
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