V.I. Djigan1, P.V. Luferchick2, P.V. Shtro3, A.Yu. Shershunovich4, E.A. Kriger5

1 National Research University «Moscow Institute of Electronic Technology» (Moscow, Russia)

2–5 JSC «SPE «Radiosvyaz» (Krasnoyarsk, Russia)

1 djigan@org.miet.ru, 2 lpv@krtz.su, 3 shtro_pv@krtz.su, 4 shershunovich_au@krtz.su, 5 dsp@krtz.su

Digital Adaptive Antenna Arrays (AAAs) are widely used in the radio receivers of the Global Satellite Navigation Systems. They suppress the signals from natural and intentional interferences in the output signals of the AAAs. However, the performance of an AAA highly depends on the identity of the electrical characteristics of its receiving channels. This paper proposes to use the digital adaptive equalizers to equalize these characteristics. The weights of these equalizers are calculated by means of the adaptive algorithms. Such equalizers can be built using the digital filters with the Finite Impulse Responses (FIR). Adaptive algorithms, based on the Least Mean Square criterion or based on the Recursive Mean Squares criterion, can be used as the algorithms for calculating the weights of these equalizers.

Objective is description and study of the efficiency of using the equalizers based on digital FIR filters, which weights are calculated using adaptive algorithms during the AAA calibration, in AAA. These wights are fixed and used during the AAA operation.

Results. It has been demonstrated the effectiveness of the channel radio receiver equalizers usage in the digital AAA. For the radio receivers with a frequency response unevenness of about 10 dB and a distance between frequency responses of about 3 dB in a 50 MHz frequency band, the unevenness of the equalized frequency responses has been reduced to about 5 dB and the distance between these frequency responses has been reduced to about 1,5 dB.

Practical Relevance. The proposed frequency response equalization technique can be used to calibrate various adaptive and non-adaptive digital antenna arrays by the adding equalizer filters to their hardware and providing access to the filter weights control.

Djigan V.I., Luferchick P.V., Shtro P.V., Shershunovich A.Yu., Kriger E.A. Equalizers for amplitude-frequency characteristics of radio receivers of digital adaptive antenna array channels. Achievements of modern radioelectronics. 2026. V. 80. № 2. P. 102–111. DOI: https://doi.org/10.18127/j20700784-202602-11 [in Russian]

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