Maximal Range Extension in LFM-CW Radars using Multi-Rate Sampling

Radar design is subject to trade-offs between maximal range, maximal unambiguous Doppler and range resolution. This work proposes to break these limiting trade-offs by extending the pass band of the anti-aliasing low pass filter (LPF). This enables extended range detection, but introduces aliasing i...

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Bibliographic Details
Published in2021 55th Asilomar Conference on Signals, Systems, and Computers pp. 523 - 527
Main Authors Longman, Oren, Bilik, Igal
Format Conference Proceeding
LanguageEnglish
Published IEEE 31.10.2021
Subjects
Computers
Doppler effect
Doppler radar
Limiting
Low-pass filters
Radar measurements
Receivers
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Summary:Radar design is subject to trade-offs between maximal range, maximal unambiguous Doppler and range resolution. This work proposes to break these limiting trade-offs by extending the pass band of the anti-aliasing low pass filter (LPF). This enables extended range detection, but introduces aliasing in range. We propose a multi sampling rate receiver approach which enables this extension by mitigating the aliasing, without compromising Doppler ambiguity and range resolution. Straightforward multi-rate sampling compromises coherency between the receive channels, and therefore, a novel approach to re-gain this coherency is derived. The performance of the proposed approach is demonstrated using measurements collected with a 77GHz automotive radar.
ISSN:2576-2303
DOI:10.1109/IEEECONF53345.2021.9723111