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K-MD2 Datasheet(PDF) 6 Page - RFbeam Microwave GmbH |
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K-MD2 Datasheet(HTML) 6 Page - RFbeam Microwave GmbH |
6 / 23 page © RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-MD2 Engineering Sample | data sheet 07/2018 – Revision A | Page 6/23 THEORY OF OPERATION The K-MD2 is configured to perform Frequency Mo- dulated Continuous Wave (FMCW). With this modu- lation the radar receives information about static and moving objects. In a typical FMCW radar system, the carrier frequency is modulated with a digitally generated linear ramp. At each step in the ramp, the received signal is demodu- lated and the phase is sampled. 4 samples ignored 256 samples used bandwidth f t Frame The K-MD2 is configured to sample 257 chirps per frame but disregards the first chirp and uses only 256 chirps. Ignoring the first chirp is necessary to exclude disturbances in the first chirp which are caused by jumping to the start frequency. First chirp ignored 256 chirps used f t Chirp 0 Chirp 1 Chirp 2 Chirp 256 Figure 7: Frame generation Figure 6: Ramp generation and sampling Ramp The K-MD2 is configured to use a saw tooth modula- tion for the ramp. It samples 260 points and ignores the first 4 samples. This means only the last 256 samples are used for processing. Ignoring the first four samples will be done to eliminate the discontinui- ty at start of the ramp. |
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