A new time-integrating acousto-optic correlator (TIAOC) was developed. It combine relatively low complexness with exceedingly wide band of signals analyzed. The main feature of the architecture is the use of the light beams interference to provide the quadrature processing channel. Near-optimum stochastic signal detection algorithm using a new TIAOC is proposed. Power losses in comparison with the optimum algorithm are less than 1 dB. The possibility of the delay evaluation and the spectrum estimation is shown.
A principle of the acousto-optic quadrature correlating analysis of radiosignals is discussed. Different architectures of the corresponding time-integrating acousto-optic correlators (TIAOC) have been considered, including the scheme of space-parametric TIAOC and the quadrature one with two cross laser beams. Variants of the structure scheme realization of the latter correlator, which are distinguished by quadrature channel organization method, are compared. Two-dimensional TIAOC with cross laser beams architecture is described. It has the most simple realization and can be used to analyze the crosscorrelation function (CCF) of two radiosignals with the optimum values of their main parameters. The experimental results obtained from the correlator are shown to be in agreement with theory.
A new time-integrating acousto-optic correlator (TIAOC) was developed. It combines relatively low complexity with an exceedingly wideband of signals analyzed. The main feature of the architecture is the use of the light beams interference to provide the quadrature processing channel. The dynamic range (DR) of the new TIAOC is calculated for the active and passive operating modes. Parameter optimization to achieve the maximum DR is performed. The photodetector charge handling capacity is shown to be the main DR limiter.
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