Brennan, Paul Victor;
Lok, Lai Bun;
(2023)
Choice and impact of frequency increment in direct digital synthesiser (DDS)‐based linear FMCW radar.
IET Radar, Sonar & Navigation
10.1049/rsn2.12440.
(In press).
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Abstract
FMCW radar is a popular technique for radar sensors. A Direct Digital Synthesiser (DDS) is commonly used to generate the required linear frequency sweep. DDS devices are widely-available and easy to configure in terms of the key radar parameters of sweep bandwidth and pulse duration. They generate a step-approximation to a linear frequency sweep for which the frequency increment parameter also needs to be defined. However, there is little information available in the literature to guide radar designers on the choice of this parameter. As a result, most designs are based on an empirical estimate of the DDS frequency increment. The aim is to provide an analytic basis and design rules for the choice of this parameter. Two principal types of FMCW radar (direct sampling and deramp) are studied to determine the effect on the range profile of the finite DDS frequency increment. It is shown that a set of spurs appears around each target response. Analytic expressions are derived to quantify the amplitude and distribution of these spurs from which simple design rules are presented to allow an informed choice of DDS frequency increment. These analytic results are convincingly validated using numerical simulations and experimental measurements.
| Type: | Article |
|---|---|
| Title: | Choice and impact of frequency increment in direct digital synthesiser (DDS)‐based linear FMCW radar |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1049/rsn2.12440 |
| Publisher version: | https://doi.org/10.1049/rsn2.12440 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | FM radar, nonlinear systems, radar theory |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10174162 |
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