Radar Doppler Frequency Measurements - Accuracy Versus SNR in Practical Processors

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Radar performs Doppler frequency measurements to determine the range rate of detected targets. Doppler helps to resolve moving targets and stationary clutter located at the same spatial cell. Doppler is also used to reduce the azimuth resolution in SAR. Most often, the two-way nature of radar and the prevailing clutter, require reception and processing at low-signal-to-noise ratio (SNR). However, there are also high-SNR radar scenes, e.g., a single target in front of clear background. Doppler is also used in one-way applications such as navigation systems or transponder carrying radar targets. In those applications, the SNR can be relatively high. With a tutorial flavor, the article discusses and compares three frequency measuring methods that fit one or both scenes-low SNR and high SNR. The discussion revisits early applications of frequency measurements such as the TRANSIT satellite navigation system and the pulse-pair technique of spectral measurement used in weather radar.

Original languageEnglish
Article number9044158
Pages (from-to)34-45
Number of pages12
JournalIEEE Aerospace and Electronic Systems Magazine
Issue number1
StatePublished - 1 Jan 2020


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