Измерение рассогласований характеристик приемных каналов стенда цифро-вой антенной решетки на базе USRPX310

A. S. Raev; A. N. Kopysov; V. V. Khvorenkov

doi:10.22213/2413-1172-2020-4-69-76

Authors

A. S. Raev Kalashnikov ISTU, Izhevsk
A. N. Kopysov Kalashnikov ISTU, Izhevsk
V. V. Khvorenkov Kalashnikov ISTU, Izhevsk

DOI:

https://doi.org/10.22213/2413-1172-2020-4-69-76

Keywords:

software defined radio, phased antenna array, USRPX310, UBX 160 MHz, Twin RX 80 MHz, Gnu Radio, MATLAB

Abstract

Currently, with the development of digital signal processing methods, there is a transition of all spheres of human activity to a new standard of equipment. This aspect has greatly affected the military sphere, in particular, the field of radar. The development of devices supporting digital processing has led to the creating of software-defined radio (SDR) technology. As a result of this technology's formation, it became possible to develop modern radar systems using software models based on SDR technology. However, there is a problem with the qualitative construction of these systems associated with SDR devices' imperfect parameters. For example, the lack of identity in the channels.

This paper aims to numerically evaluate the mismatch of characteristics between channels of SDR devices. The object of research is a digital antenna array stand. To achieve this goal, it is necessary to develop a method for measuring characteristics based on which the tests are carried out.

During the tests, graphs of changes in the phase shifts between channels from time to time, and numerical estimates of the values are constructed. It is revealed that the channels of a four-channel receiver have a constant phase shift relative to the first channel. This phase shift is maintained over time for each channel.

After determining the absolute values of phase shifts, a method for their calibration was developed. It will allow you to use the selected tools when developing a phased array antenna. However, during calibration, there was a discrepancy of signal levels between the channels. The relative level error was ± 2 % for the second channel, ± 4 % for the third one, and ± 7 % for the fourth one relative to the first channel.

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