Abstract
This study investigates crosstalk and leakage in the Software Defined Radio implementation of Frequency Modulated Continuous Wave (FMCW) radar systems. Empirical measurements of leakage power were conducted during the implementation of FMCW radar using National Instruments Universal Software Radio Peripheral (USRP) boards. Mono-static and bi-static/distributed Transmitter-Receiver configurations are compared for low power micro-Doppler applications. The impact of crosstalk on the dynamic range of the target is also investigated. The impact of electric noise generated by a windy source on the receiving USRP is also investigated. Furthermore, a simple splitter based approach is proposed to overcome the challenge of synchronisation or recovery of transmitted waveform in distributed configurations.
Highlights
Software Defined Radios (SDRs) are increasingly being used for prototyping of modern Radio Frequency (RF) transmission systems
The error vector is used to adjust the vector modulator. All such techniques can be effective in mitigating the leakage in Frequency Modulated Continuous Wave (FMCW) systems, this study addresses a different dimension of crosstalk and leakage, that is to demonstrate the presence, variability and severity of crosstalk in FMCW radars implemented using Universal Software Radio Peripheral (USRP) radios
Significant reduction in crosstalk, of the order of tens of dBs can be expected while using different channel of the same USRP device We have provided a quantitative analysis of leakage power for various NI USRP devices It has been shown that the implementation of FMCW radar system in bi‐static and multi‐static configuration renders more benefits in terms of detection of targets and in signal processing as it does not need a crosstalk elimination procedure
Summary
Software Defined Radios (SDRs) are increasingly being used for prototyping of modern Radio Frequency (RF) transmission systems. They are rapidly advancing and providing considerable benefits to both communications and RF sensing applications. The use of SDR for implementing low cost radar systems has been on the rise over the last decade [1]. Thanks to the recent advancements, FMCW is the leading technology for low cost radar applications. FMCW radars are used for a range of diverse applications [3], for example, Moving Target Detection radars, vital sign detection systems, Synthetic Aperture Radars and most recently in the automotive radars, all use FMCW signal transmission [4]. FMCW radars use linear frequency modulation (LFM) and its transmitted signal s(t) is given as sðtÞ
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