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5-2020

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Fachzeitschrift für Hochfrequenz- und Mikrowellentechnik

RF & Wireless An

RF & Wireless An Integrated Framework Complex Radar System Design Figure 1: VSS main radar system diagram showing linear chirp source, RF transmitter and receiver links, target and propagation model, and receiver baseband signal processing blocks. NI AWR www.awr.com www.ni.com This application example showcases how NI AWR Design Environment, specifically Visual System Simulator (VSS) system simulation software, enables radar system architects and RF component manufacturers to design, validate, and prototype a radar system. This integrated platform provides a path for digital, RF, and system engineers to collaborate on complex radar system design. Background Modern radar systems are complex and depend heavily on advanced signal processing algorithms to improve their detection performance. At the same time, the radio front end must meet challenging specifications with a combination of available components, implementation technologies, regulatory constraints, requirements from the system, and signal processing. The example project in this example, Pulse_Doppler_Radar_ System.emp, illustrates key models and simulation capabilities available for practical radar design. The project and resulting measurements highlight how to configure a Pulse-Doppler radar and set up the simulation to obtain the metrics of interest for radar development. The entire pulse-Doppler (PD) radar system project includes a linear FM (LFM) chirp signal generator, RF transmitter, antennas, clutter, RF receiver, moving target detection (MTD), constant false alarm rate (CFAR) processor, and signal detector for simulation purposes. Theory of Operation PD radars produce velocity data by reflecting a microwave signal from a given target and analyzing how the frequency of the returned signal has shifted due to the object’s motion. This variation in frequency provides the radial component of a target’s velocity relative to the radar. The radar determines the frequency shift by measuring the phase change that occurs in the EM pulse over a series of pulses. By measuring the Doppler rate, the radar is able 50 hf-praxis 5/2020

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