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Coherent Distributed Radar for High-Resolution Through-Wall Imaging
Progress rept. no. 21
INTELLIGENT AUTOMATION INC ROCKVILLE MD
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During this period of performance, we processed data collected in different node location configurations for accuracy of the currently implemented algorithm, which is an edge detection algorithm. It sets the base line performance of the current ranging system. In the next reporting periods, we will reprocess this data to show the improvement achievable by digital beam forming. Figure 1 shows the correlation between the actual measured range between the master and the slave and the reported range One-Time Of Flight, or OTOF from our system. Our data shows an RMS range error of 2.6 meters for the outdoor case. We also processed data collected in two indoor configurations LOS and non-LOS. The correlation between the actual range and reported OTOF for these two subsets are shown separately in Figure 2. This plot shows that for the non-LOS case, the range has an RMS error of 11.7 meters. A second set of data was taken inside the Intelligent Automation building shown in Figure 3 at similar waypoints. This plot indicates that the system is quite repeatable even for the non-LOS case when the experiment location is the same. Currently we are investigating algorithms to improve the range accuracy of our system. The two algorithms that we are studying are channel estimation and digital beam forming. In addition to recording the reported OTOF during our previous indooroutdoor experiments, we have recorded the I and the Q data reported by our system. This data will be used to study these algorithms for bistatic radar imaging and range accuracy improvement
APPROVED FOR PUBLIC RELEASE