Abstract
A new realization of the acousto-optic time-integrating correlator has been constructed. The new device uses a surface-acoustic-wave delay line and is configured so that no separate reference beam is required for coherent detection. Instantaneous bandwidths of 30 MHz and integration times of 30 ms have been achieved. Broadband signals, such as pseudonoise biphase modulated waveforms, with signal-to-noise ratios of −40 dB have been detected. In addition, center frequency, bandwidth, and relative time-difference-of-arrival of these signals can be determined.
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