Radar signal generation and processing techniques
are growing ever more advanced. These advances are
being driven by the need to improve resolution (the
ability to detect targets that are very close together)
and reduce radar spectrum occupancy. Reducing
spectral occupancy can serve two goals: reduce
interference and minimize the probability of intercept
(POI). These advanced designs are being implemented
as digital radar where the data converters are very
close to the antenna and parameters such as
demodulation, matched filtering, range gating, etc.
are performed using digital signal processing (DSP).
Field Programmable Gate Arrays (FPGAs) are
emerging as a useful approach to digitally
implemented radar systems due to flexibility and cost
reduction. The use of FPGAs and DSP means that the
effectiveness of the radar system is becoming
increasingly dependent on the pre-distortion, filtering
and detection algorithms.
This application note will provide a summarized review
of radar essentials and some of the challenges in
modern radar systems. This is followed by an
explanation of how to take advantage of the increased
sample rate, analog bandwidth, memory, and digital
outputs found in the Arbitrary Waveform Generators
(AWGs) in order to: increase resolution, decrease false
target returns, and increase the probability of detecting
actual targets. The last section will cover
troubleshooting the radar transceiver chain.
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Application Note: Generating Advanced Radar Signals Using Arbitrary Waveform Generators