S. D. Votoropin

EHF autodyne signals for tracking the parameters of moving objects

To improve the characteristics of short-range autodyne radar systems and to extend their application range, it is very important from both theoretical and practical viewpoints to study the autodyne signal waveform and spectrum. In the present paper, the results of investigations into the specific features of the autodyne response of an EHF generator are presented as functions of the parameters of a moving object and the radiation reflectance. The results of experiments performed in the present work are in agreement with theoretical conclusions.

Analysis of Operating Regimes of EHF Hybrid-Integrated Autodynes Based on the Gunn Micropower Mesaplanar Diodes

The results of investigations into the operating regimes of EHF hybrid-integrated autodyne generators are given in the present paper. Multipurpose crystals with three mesaplanar structures, one of which serves as an active element and the two others serve as control elements, are used as active elements. The segment of a coplanar strip transmission line are used as a resonant system of the autodyne. The cw regime of autodyne operation and regimes with various types of radiation modulation, which allow the class of problems solved by short-range radar systems to be extended, are examined.

Methods of autodyne signal registration

In order to increase autodyne radar sensibility and its reach, accordingly, it is proposed to record autodyne frequency changes. At the moving of reflecting object, oscillations occur with Doppler frequency. Autodyne system becomes cheaper and less complicated if autodyne signal is recorded in the feed circuit. For this purpose resistors, chokes and transformers are used. From the analysis conducted it follows, that autodyne radar, which records the change of oscillation frequency is close to potential limit of autodyne systems.

Generalized Model and Basic Equations for an EHF Autodyne HMC Based on the Gunn Planar Mesas

The results of theoretical investigations into an EHF autodyne HMC with the multipurpose crystal having N planar mesas are presented. Continuous regime of NMC operation as a multimodular autodyne system of polyharmonic generation under the action of self-radiation reflected at each harmonic is examined. Basic relations for autodyne response are derived. General conclusions on specific features of autodyne self-oscillations, which allow its characteristics to be improved and the functional capabilities of autodyne short-range radar systems to be extended, are made.

Application of Autodyne Effect of UHF Oscillators for Studying Their Radio Physical Properties

An autodyne effect in UHF oscillators is presented for autonomous features investigation and checking its performance by means of the autodyne mode implementation. In this report operation modes analysis of active non-linear Gunn diodes is discussed on the base of autodyne effect which has an essential importance at studying and developing of oscillators

Temperature feature analysis of autodyne oscillators on gunn diode

Theoretical analysis fulfilled for temperature impact upon autodyne oscillators shows that this factor causes the self-oscillation condition changing first of all: namely, auto-bias, amplitude and frequency of oscillations, as well as output power. Temperature curves of the autodyne potential, its output levels of the signal and noise are determined by behavior of an autodyne gain factor, which in turn depends of the temperature variations of oscillator limit cycle fastness. Experimental research of autodyne properties, which is made on the basis of hybrid-integrated circuit ldquoTigel-08rdquo, shows that its potential and levels of output signal and noise in temperature range from -50 to +50deg C vary not more than 3 dB. Temperature frequency factor of these modules is (5.3-8) middot10-3 1/degree which corresponds with conventional microwave oscillators.

Analysis of Autodyne Signal from Distributed Reflecting Object

The autodyne signal features revealed for the radar environment model considered demonstrate that in the autodyne short-range radar with Doppler target selectivity it is necessary to take into consideration the presence of combinative signal interference from the separate reflecting objects. In order to improve the resolution ratio and noise immunity of autodyne short-range radar, it is necessary first of all to take action to decrease the value of autodyne oscillation frequency deviation. In this way it is expedient and promising to use the stabilized double-diode and biharmonic autodynes providing much better spectral structure of autodyne signal.

Autodyne Signal Features at Reflecting Object Vibration

Considered in this paper are the signal generation features on the basis of the amplitude and frequency variations in the autodyne oscillator under the influence of electromagnetic wave reflected from vibrating reflecting object. Recommendations regarding correct choosing of the operating point are offered. The research carried out allows to develop the set of general points and recommendations for application in the instruments and devices for monitoring and vibration measurement, which include the following. 1. When increasing the reflected radiation level and choosing correct operating point, autodyne sensors provide almost double yield in the dynamic range compared with homodyne sensors. 2. The problems of radio wave monitoring and vibration parameter measurement should be fully solved by autodyne sensors subject to parameters and functionality of autodyne oscillators. 3. It is perspective to use modern autodyne measuring modules implemented on hybrid integrated technology.

Autodyne Radar Detecting the Motion Direction of Reflecting Objects

Presented in this paper are three versions of technical decision for autodyne radar, which provide the opportunity to measure simultaneously the velocity of objects motion and to detect the direction of their relative movement. The radar includes combined antenna connected to autodyne transmit-receive module with frequency conversion and decoupling wideband transformer, IF signal amplifier, frequency discriminator, amplitude detector, phase comparator and frequency counter. The direction of relative motion can be defined with the aid of phase shift between autodyne amplitude changes and frequency changes in the oscillator being influenced by the reflected reradiated signal

Autodyne mini-radars of the millimeter range

In the given message results of autodyne structure of the MM transceiver with various kinds of modulation are submitted and devices for processing of the accepted signals are considered. The most preferable active element for autodyne radar are Gunn diodes surpassing other types of active elements under the basic power characteristics, and also under electric durability, reliability, stability and do not demand high values of supply voltage. In a short-wave part of a MM range InP Gunn diodes have considerably best parameters, than GaAs devices, and development of devices with the highly effective oscillator on low-current Gunn diodes can provide excellent mini-radar characteristics