Wide-area sensing of amplitude modulated signals

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United States of America

PATENT NO 11375146
APP PUB NO 20220166516A1
SERIAL NO

16801276

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Abstract

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Amplitude-modulated (AM) signals spanning a spatial wide area can be efficiently detected using a slowly scanning optical system. The system decouples the AM carrier from the AM signal bandwidth (or carrier uncertainty), enabling Nyquist sampling of only the information-bearing AM signal (or the known frequency bandwidth). The system includes a staring sensor with N pixels (e.g., N>106) that searches for a sinusoidal frequency of unknown phase and frequency, perhaps constrained to a particular band by a priori information about the signal. Counters in the sensor pixels mix the detected signals with local oscillators to down-convert the signal of interest, e.g., to a baseband frequency. The counters store the down-converted signal for read out at a rate lower than the Nyquist rate of AM signal. The counts can be shifted among pixels synchronously with the optical line-of-sight for scanning operation.

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Patent Owner(s)

  • MASSACHUSETTS INSTITUTE OF TECHNOLOGY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Schultz, Kenneth Lexington, US 8 364

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