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Coherent Distributed Radar for High-Resolution Through-Wall Imaging
Progress rept. no. 22
INTELLIGENT AUTOMATION INC ROCKVILLE MD
Pagination or Media Count:
In this reporting period, we are continuing to collect indoor data and processing the scans for improving the indoor range accuracy. Since the transceivers are very tightly synchronized, the transmission phase and time and the phase use for down conversion are well-controlled and repeatable as we perform the experiments. As a result, we observe a clear correlation between the range error and the correlation amplitude. In Figure 1, we show the Correlator output for data with very large positive, or very large negative range error. The data show that for large Correlator output, a positive range error is observed, and for small Correlator output, a negative range error is observed. This result is not unexpected these two cases correspond to constructive and destructive multipath interference, respectively. This observation suggests that we can improve the range accuracy by methods that are based on channel estimation, such as successive interference cancelation. We are continuing to take more data and develop algorithms for improved range accuracy based on both channel estimation and digital beam forming. We also are developing algorithms for bistatic radar imaging.
APPROVED FOR PUBLIC RELEASE