Kokhanov O. Science fundamentals development and hardware and software design of the measuring radio receivers with the reduced errors in the radio signal measuring transforms

The thesis for the attainment of the Science Degree of the Doctor of Technical Sciences on the specialty 05.01.02 – standardization, certification and metrological support. Odessa National Polytechnic University of the Ministry of Education and Science of Ukraine. Odessa, 2018. The thesis for the attainment of the Science Degree of the Doctor of Technical Sciences on the specialty 05.01.02 - standardization, certification and metrological support. Odessa National Polytechnic University of the Ministry of Education and Science of Ukraine. Odessa, 2018. The thesis is dedicated to the development of science fundamentals, and hardware and software implementation of methods of new measuring signals generation and demodulation, as well as their transformations, in measuring radio receivers, and as a result, new measuring signal provides the transmission of a measuring information with a reduced probability of error rate. Using measuring signals with the quadrature angular modulation and signals with the digital single-side-band quadrature modulation allows to reduce the radio-frequency resource for transmitting of the measuring signal through the radio channel. This leads to diminish the noise energy generated by communication channel by 3 dB in the operational bandwidth. As a result, when the measuring signal is demodulated in the measuring receiver, the probability of bit error rate decreases. A new method of the carrier phase recovering in a measuring coherent radio receiver that uses either, analog or digital phase filter, is developed. This method allows essentially eliminate the phase error of the measuring signal in the measuring receiver synchronous detector. The phase filter provides auto-tuning of the received measuring modulated radio signal phase to the phase of the reference primary (secondary or working) oscillator (heterodyne). It helps to reduce the number of transmission links for the reference pilot signal transmission. Such a phase converter does not generate the parasitic harmonics, as well as eliminate the instrumental error introduced by the mirror channel interference. A new development and implementation of an automatic digital synchronizer of a digital binary data, which streaming from a primary reference (secondary or working) oscillator of the telecommunications system generator equipment, are proposed. Suggested automatic digital synchronizer allows to avoid of using the synchronization signals from the reference signal network, through which the reference synchronization signals are transmitted. New algorithms of signal transformations in the measuring signals modulators that employ the orthogonal frequency digital modulation (OFDM) have been developed. In these signal transformations the discrete Fast Hartley transform is used as an alternative to the discrete Fast Fourier transform (FFT). As a result, all mathematical operations over the signal transformation use only real arithmetic versus complex arithmetic in FFT. It allows to reduce the number of multiplications as much as 2.66 and triple as much multiplications in comparison with the signal forming using FFT.