Abstract
Searching for living people under the rubble of buildings collapsed due to man-made or natural disasters, special radars play an important role, which allow you to see a living person behind optically opaque obstacles. The information sign of a living person in the reflected signal is the Doppler modulation of the signal phase, due to the processes of breathing and heartbeats. This phase modulation has an ultralow frequency and can be effectively detected using long pseudo-noise probing signals, for example, based on Mersenne codes. To reduce inter-symbol interference in the code sequence, a linear correlation receiver is built. Its signal processing algorithm is based on all received patterns observed during a fixed interval. The decision in favor of the first character in the chosen code combination is made under the assumption of ideal feedback, which provides almost the maximum error probability characteristics in systems with a serial Mersenne code.
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