Generation of radiovision signals by spectral saturation in transient distortion mode of integral microwave amplifiers for gesture recognition systems

Objectives. The paper aims to investigate the mechanisms of the nonlinear formation of a wideband pulse spectrum under overload conditions in ultra-wideband (UWB) amplifier circuits in resolving problems related to radiovision gesture recognition. The relevance of the study stems from the need to enhance the accuracy and noise immunity of modern radiovision UWB systems for gestural control interfaces.

Methods. The study used statistical radiophysics, time-frequency methods of wavelet transformation of radio images, the theory of S-parametric vector analysis of circuits, and software-numerical modeling.

Results. The method for generating UWB signals in the microwave range based on controlled nonlinear signal distortion is presented. When the amplifier is switched to the saturation mode, a signal with sharp fronts is formed with a wide energy spectrum. A laboratory setup of a cyber-physical system for gesture recognition using radio sensing was developed, and its characteristics were investigated. The properties of the pulses generated in radiovision control systems were also studied. The effectiveness of the proposed approach for the tasks of radiovision gesture recognition was experimentally demonstrated.

Conclusions. A method of nonlinear saturation-synthesis of the spectrum of radiovision signals based on transient distortion phenomena in UWB amplifiers is proposed. It was shown that, when the initial frequency band is expanded up to 900 MHz, the interference mode can provide phase image repeatability of at least 0.94. It was also established that in the input overloaded mode of the SBB5089Z type amplifier with low-mode harmonic excitation at a transition frequency of 47 MHz in a cascade amplification scheme, a signal with a modified spectrum can be obtained at the output of the radio antenna. In this case, the controlled formation of the antenna excitation spectrum for each amplifier module is determined by means of the unique impulse characteristic of the integrated UWB-amplifier. This allows for the successful application such amplifiers in resolving problems related to radiovision gesture recognition. The methodology proposed allows the use of standard UWB amplifiers to create compact sources of UWB signals without the complication of circuitry.

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