Some Radar Topics Waveform Design, Range CFAR and Target Recognition

Keywords automotive radar continuous wave radar CFAR processing rank-order filters FSK modulation matched filters unmatched filters. 

Advances in Sensing with Security Applications, 293-322. 2006 Springer. Printed in the Netherlands. 

To meet all these system requirements specific waveform design techniques must be considered. For ACC systems both radar types of classical pulse waveform with ultra short pulse length (10 ns) or alternatively continuous wave (CW) transmit signal with a bandwidth of 150 MHz are considered. The main advantage of CW systems in comparison with classical pulse waveforms is the low measurement time and low computational complexity. 

This section describes a new waveform design for automotive applications based on CW transmit signals which lead to an extremely short measurement time. The basic idea is a combination of linear frequency modulation (LFM) and FSK CW waveforms in an intertwined technique. Unambiguous range and velocity measurement with high resolution and accuracy can be required in this case even in multi-target situations. After introductions to FSK and LFM waveform design techniques in sections 2.1 and 2.2 the combined and intertwined waveform is described in detail in section 2.3. 

Each signal sequence A or B will be processed separately by using the Fourier transform and CFAR target detection techniques. A single target with specific range and velocity will be detected in both sequences 

---