Choice and impact of frequency increment in direct digital synthesiser (DDS)‐based linear FMCW radar

FMCW radar is a popular technique for sensors. A Direct Digital Synthesiser (DDS) commonly used to generate the required linear frequency sweep. DDS devices are widely-available and easy configure in terms of key parameters sweep bandwidth pulse duration. They step-approximation which increment parameter also needs be defined. However, there little information available literature guide designers on choice this parameter. As result, most designs based an empirical estimate increment. The aim provide analytic basis design rules Two principal types (direct sampling deramp) studied determine effect range profile finite It shown that set spurs appears around each target response. Analytic expressions derived quantify amplitude distribution these from simple presented allow informed These results convincingly validated using numerical simulations experimental measurements.