A. P. Chupahin

Particularities of double-diode autodyne characteristics

Calculations of main characteristics of a two-diode autodyne subject to the influence of eigen reflected radiation are performed. It is used, at that, a mathematical model in the form of two mutually synchronized partial oscillators with a delayed mutual coupling between them. Particularities of behavior of amplitude and phase characteristic variations of partial oscillators, frequency and phase difference, along with the response of active elements in the power supply circuit are considered.

Mathematical model of double-diode autodyne

A mathematical model has been developed for a double-diode autodyne oscillator affected by the proper reradiation. The model represents two mutually-synchronized partial oscillators with time delayed coupling between them. It is possible for studying peculiarities of autodyne amplitude variations of the partial oscillators, autodyne variations of frequency and phase difference and, also, in the power supply circuit responses of the active elements.

Autodyne effect application for stability analysis of the steady-state mode of UHF oscillating systems

The autodyne characteristics are oifered to use for steady-state stability analysis of the UHF oscillators. Theoretical substantiation of the proposed method is performed on an example of the oscillating systems mathematical model presented in the form of two mutually-locked partial oscillators under a condition of strong coupling between them. Peculiarities of stable functioning zones for oscillating systems are described at different partial oscillator parameters and for various conditions of their mutual coupling. Experimental investigations are performed based on the 8mm-wavelength range double-diode oscillator.

Influence of the autodyne oscillator coupling degree with antenna upon its transfer and noise characteristics

Analysis results of coupling degree influence of the autodyne oscillator with an antenna are presented together with influence of the impedance characteristic type (soft or rigid) of the active element on the coefficients of autodyne amplification, autodyne frequency deviation and power transfer as well as on the noise parameters and characteristics. Analytical and numerical calculations of above-mentioned parameters and characteristics are performed, and results of experimental investigations of the 8mm-range Gunn diode autodyne are given.

Signal analysis of a double-diode autodyne

Analysis results of autodyne signals of the double-diode oscillator, which is under influence of the proper reflected emission from the moving object, are presented. The analysis is performed on the base of the autodyne mathematical model presented in the form of a system of two mutually-locked partial oscillators under condition of strong mutual coupling. Peculiarities of signal formation are considered for various parameters of partial oscillators and coupling conditions. Experimental data are obtained for the 8mm-range Gunn double-diode oscillator of the flange type.

Анализ сигналов от движущегося объекта автодинных локаторов с линейными видами модуляции частоты

Представлены результаты исследования особенностей формирования сигналов автодинной системы ближней радиолокации с линейной частотной модуляцией для движущегося отражающего объекта. Получены основные соотношения и результаты вычисления автодинных сигналов для случаев, когда продолжительность их периода значительно больше времени запаздывания отраженного излучения, а также для случаев, когда данное неравенство не выполняется. Рассмотрены особенности сигналов для приближающегося и удаляющегося объекта. Экспериментальные данные получены на генераторе, выполненном на диоде Ганна 8-мм диапазона с перестройкой частоты при помощи варикапа

Influence of coupling between an oscillator and an antenna on autodyne transponder features in the frequency locking mode

Starting relations are obtained for the coupling influence analysis between an oscillator and an antenna for autodyne transponder features in the mode of frequency locking by the request radar signal. The operation speed investigation results show the dependence upon a coupling degree and the oscillator operation mode as well as on the value of the “softness” index of the impedance characteristic of an active element. Experimental results are obtained on the example of the transistor oscillator in the 15sm-wavelength range.

Application of double-diode autodynes in control systems for technological processes

Options and application opportunities of double-diode autodynes in microwave sensors are considered to radio-wave control dimensions of products, vibration and displacement parameters, velocity and movement direction of reflecting objects.

Main expressions for anaslysis of signals and noise of FM autodyne radar

Main expressions for calculation and analysis of features of phase, frequency and amplitude characteristics as well as output response, which is registered in the power supply circuit of the autodyne oscillator with frequency modulation are obtained. Final expressions for functions of delayed impact are derived with account of real conditions of autodyne system operation in short-range radar of mm-range.

Experimental studies of the 8-mm wave Gunn diode autodynes

Data of the experimental studies of an energy potential and dynamic range of the normal and frequency stabilized by the external high-Q resonator autodynes based on planar 8-mm Gunn diodes are provided.