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Investigation results of signal formation peculiarities are presented for the autodyne short-range radar system using the symmetric saw-tooth law of frequency modulation. Experimental data is obtained with the Gunn-diode 8mm-range oscillator with frequency tuning with the varicap help.
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...
The new problem in the autodyne short-range radar theory is considered for the electrodynamics model on interaction of an oscillator with emission reflected from the radar object. The radar object is represented in the form of an arbitrary surface located in antenna emission field. The main relations for the analysis of diffraction influence of the reflected emission upon autodyne signal formation.
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...
Main equations for calculation of autodyne response time constant, the boundary cutoff frequency of autodyne signal and sensitivity of a microwave oscillator are obtained. Investigations of dependence of these parameters on the oscillations mode choice and the form of an impedance characteristic of the active element are performed on the example of the Gunn diode autodyne of-8mm-range.
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.
Operation principle, adjustment approach and construction description are given for double-diode autodyne module of 8mm-range made on the base of two mutually-synchronized partial oscillators on Gunn diodes. The block-diagram of a workbench is presented for determination of the motion speed and direction, vibration parameters and displacements of reflecting objects with the help of double-diode autodynes.
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,...
The results of experimental research of the possibility of applying survey radar sensors and laser sensors for automated location of carriages on the railway tracks of classification (marshalling) yards and junction stations of railway network are observed. The description of the parameters of the locators, targets and experiment conditions in classification yards is given. The procedure of radar...
The analysis of work and technical solutions which are the basis of the operating principle of autodyne altimeters for aircraft offered by Dr. Alexanderson, a great inventor of the 20th century, is carried out. Obtained results of the analysis showed the correctness of technical solutions and deep insight of the physics of autodynes by the author of the invention.
A mathematical model of autodyne turbine engine vibration sensors was developed. Oscillator power supply noises were taken into account. The analysis of autodyne and noise characteristics was carried out. The main requirements to the choice of the operation point and to the level of reflected radiation for various characteristics were formulated. The results of experimental research were obtained...
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