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Results of signal peculiarities' investigation of an autodyne short-range radar system with linear frequency modulation for the moving reflecting object are considered. The autodyne signal plots are obtained for the cases when its period duration is much longer than delay time of the reflected emission as well as for the cases when this inequality is not satisfied. Experimental data are obtained on...
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...
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...
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...
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 system's 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...
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.
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...
Basic expressions for calculating noise parameters of the autodyne short-range radar sensor (ASRRS) have been obtained that take into account the self-noise of the UHF oscillator and the feed-source noise. The calculation results on the limiting sensitivity, energy potential and dynamic range width of an 8-mm Gunn-diode (GD) autodyne radar are presented.
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.
Calculations of phase, frequency and amplitude characteristics are performed as well as the output signal, which is registered in the power supply circuit of the autodyne oscillator with linear FM of radiation are carried out. Calculations are performed at different values of feedback parameter. At that, dependences of appropriate noise levels as functions of distance to reflector are given. The phenomenon...
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.
The mathematical model of operation of frequency modulated autodyne radar is developed. The model is presented in the form of an oscillator situated under influence of the proper reflected radiation from a radar object and inherent oscillator noises. Options of frequency modulation in the supply circuit and by means of capacity variation of the varicap embedded into the oscillator are considered....
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,...
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