V.F. Los’ – Ph.D.(Phys.-Math.), Senior Research Scientist, Leading Research Scientist, 

JSC «Radio Engineering Corporation «Vega» (Moscow)

E-mail: mail@vega.su

Е.R. Tsvetov – Ph.D. (Eng.)

This work represents principle a variation of a mutual orientation of signal and reference optical beams with different frequencies in socalled the optical heterodyne correlator (OHC) with help of the hologram lens scanning (HLS) in its joint Fourier transform plane (JFTP) for the purpose to obtain the signal for a beam steering in scanning antenna arrays. For an achievement of the desired frequency difference of a both beam they may be produced with a help of an acoustooptical beamsplitter modulated by high radio- frequency. This beams are illuminated the reference and signal transparency in optical system separately. The mutual orientation is accomplished when the reference wave front passes to input plane of a fiber cable matrix in zero order of hologram lens (HL) whereas the signal wave front passes in +1-st or -1-st diffraction order of HL. Output end of each from fiber cable is connected with own optical photodetector (PhD). The necessary for a beam steering signal is produced as a beating signal with a Doppler frequency shift, which choose equal to working frequency of a antenna array. The radiofrequency output of PhD is connected with a radiating element of an antenna array in transmitting mode or with a mixer heterodyne input in receiver mode. In order to the beating signal of a individual PhD be a beam steering signal of a whole antenna array it is necessary that topology of a fiber cable input end were similar to topology antenna array elements in space. When a current mean spatial frequency in HL becomes equal to mean interference spatial frequency in JFT pattern both the signal and reference wave fronts would pass to PhD collinearly. In this moment the beam of a radiation pattern direct along normal to an antenna aperture. If a current spatial frequency of HL differ from interference spatial frequency in JFT pattern, so on inputs of array elements arise a linear on both coordinates phase distribution and a beam is move aside from normal. All three functions – overlapping, scanning and light frequency shift between reference and signal light beam – are realized by HLS. The 2D processing can be realized when fast rotating disk or drum with numerous overlapped shortly focusing hologram lenses is used.

A noted principle of a beam scanning may be used as in receiving so transmitting antenna arrays. Schemata of corresponding arrays are presented. Make also an example of the this principle practical using in a device for a different symbol recognition, where is shown what ratio signal/noise is around 10 dB with a power He-Ne laser near 10 mW. In application given a operation principle and mathematical model of OHC. Given also the consideration on a possible application of a proposed optical method for a scanning antenna array beam steering.

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