"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 4, 2018

contents of issue      DOI  10.30898/1684-1719.2018.4.8     full text in Russian (pdf)  

Generalized ambiguity function in multistate radio holography system using signal recirculation


V. I. Kalinin, V. V. Chapursky

Fryazinio Branch of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Vvedensky Sq.1, Fryazino Moscow region 141190, Russia

 

 The paper is received on April 16, 2018

 

Abstract. Generalized ambiguity function versus spatial coordinates is obtained for orthogonal signals recirculated in the multistate radio holography system using two-measure transmitter and receiver antenna arrays.  Two kind of orthogonal regular signal ensembles are considered: linear frequency modulation signals with uncovered spectrum and monopulse multi frequency signals.  Each element of a transmission array can radiate a signal with a certain spectral width and its own center frequency from a frequency grid. New target observation method is based on the recirculation of orthogonal regular signals in a spatial feedback loop formed by the radio holography system and the target. The recirculation method is implemented by means of tapping, amplification, and feeding of a portion of the received signal into the transmitting circuit, where this signal is combined with the current signal generated by a transmitter source. The obtained sum signal is again radiated toward the target. With the use of transmitting array with orthogonal signals, the recirculation method can be implemented in each antenna element. Spatial resolution analysis of radio holography systems with antenna arrays is based on a construction of an averaged multidimensional generalized ambiguity function (GAF). Detailed study of generalized ambiguity function and the 2D its sections along spatial coordinates allows estimation of the spatial and angular resolutions; GAF sidelobe level; and the possibility of unambiguous measurements of the delay (range) and the angular coordinates for different combinations of the aperture dimensions, the number of elements, and the frequency spacing of the orthogonal regular signals radiated by the array elements. The GAF functions are constructed and calculated in result of the space–time signal processing with the use of the averaged complex correlation integral of the reference and received vector signals. Generalized ambiguity functions are compared in two cases - presence or absence of a signal recirculation in a spatial feedback loop. Recirculation affect causes significant narrowing (some times) of GAF main lobe that is equality to enhance the spatial resolution of a point reflector when a transmission coefficient of a spatial loop achieves 0.7-0.9 values. In that case, GAF sidelobe levels are sharply decreased and it is appeared the possibility of unambiguous measurements of the delay (range) and the angular coordinates.

Key words: multistate radio holography system, generalized ambiguity function, signal recirculation, antenna array.

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For citation:
V.I. Kalinin, V.V. Chapursky. Generalized ambiguity function in multistate radio holography system using signal recirculation. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 4. Available at http://jre.cplire.ru/jre/apr18/9/text.pdf

DOI  10.30898/1684-1719.2018.4.9