By Dmitrii Ivanovich Voskresenskii, Aleksandr Iur’evich Grinev, Evgenii Nikolaevich Voronin (auth.)
Modern radar, telecommunication, sonar, and radio-astronomy structures use built-in platforms, complicated signs, and sign processing tools exten sively. those structures require the improvement of recent, extra effective platforms. one of many significant how one can enhance radar and sonar platforms is to exploit multichannel platforms, the main promising of which hire space-time sign processing. within the previous couple of years the extensive progress in electronics, informa tion processing options, microwave and laser know-how, electrooptics and holography, acoustics, and optoelectronics have ended in new clinical and technological examine fronts. this kind of is the idea and know-how of electrooptical array antennas-a new type of receiving antennas whose pat tern is managed via coherent optics and holography. Electrooptical array conception and expertise were eager about the research of the ability, solution, and diversity features of arrays with a number of coherent opti cal processors. the sensible purposes of those structures and strategies for construction them utilizing modern optoelectronics have additionally been studied.
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Sample text
1) where Jt{ . } = f~ ... exp( -iOt)dt; "-1" is a symbol of the inverse Fourier transformation; s is the vector spectrum of rf radiation received at the array from the upper hemisphere which being expressed in angular coordinates O,¢ [see eq. l = dOxdO y = K 2 d(cos a)d(cos ,8); the remaining symbols are explained in eq. 1) and in Fig. 2a. , to the reproduction of a two-dimensional scalar spectrum s = s1. 1), as a function of angular coordinates. Ideally it would be desirable to accomplish this restoration [19] with an infinitely high resolution.
As a rule, these space-time light modulators operate in the Bragg diffraction 19 mode. F = 100 ... 200 MHz. F ~ 500 MHz at an operating frequency of 1 GHz) by selecting the configuration of the acoustooptical interaction and, second, to decrease significantly the background noise on the photodetector [112]. On the whole, a multichannel AOM permits real-time processing of a large number (50 to 100) of parallel channels, each of which may potentially operate at frequencies of 1 GHz and higher and have a bandwidth of 100 to 300 MHz or more; AOMs are characterized by a low control voltage at a relatively low cost.
Since the modulation is non-linear and the method of complex amplitude is not applicable, it is necessary make the approximation that the C ~ lRe{ C}. , in dual band light modulation [89], the radio scene is reproduced as equal complex-conjugate images, centrally symmetrical relative to the processor axis and on the symmetrical ones relative to frequency, /I (see Fig. 2b). 2. d is the Dirac delta function. 11) points to the absence of spatial radiation coherence (correlation), arriving at the array from different directions.
