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We introduce the fast digital algorithms for the coherent demodulation of binary and four position differential phase-shift keyed signals. These algorithms can be practically implemented with the minimum number of simple arithmetic operations over the input signal period and they are is fully compatible with the modern hardware components available. We obtain the timing diagrams of the demodulators...
The paper deals with the functioning and analysis of the accuracy of various instruments and systems of orientation, stabilization and navigation on micromechanical gyroscopes (MMG) and accelerometers (MMA). Analytical relations for calculation of errors of the commander of commands of the rotating carrier, strapdown verticals, strapdown inertial navigation system (SINS), system of measuring of vertical...
The paper deals with a strapdown inertial navigation system (SINS) of a rotating carrier (RC) characterized by a high roll speed and rather slow oscillations in the yaw and pitch angles. It is shown that it is expedient for an RC to develop four orientation parameters: traditional yaw angles, pitch and trigonometric functions of the sine, cosine of the angle of heel. It analyzes the methods to update...
The paper considers the task of determining the angular position of the pilot's head with respect to the vehicle body. The task is solved due to the use of two inertial measuring modules, one of which is based on the pilot's head, and the second is rigidly connected to the vehicle body. It is accepted that within some small angles relative to the longitudinal axis of the vehicle, it is possible to...
We consider the advanced digital noncoherent demodulator of "integrally" coded binary phase-shift keyed signals. This demodulator requires carrying out the minimum simple arithmetic operations over the input signal period. We study its noise immunity, and we show that for relatively short codes “integrally” demodulation leads to considerable gain in comparison with step-by-step demodulation...
We are to introduce the basic fast digital coherent demodulation algorithms for the radio signals with various modulation formats, the ones that require the minimum number of simple arithmetic operations. We are demonstrating how they provide the implementation of the demodulators of the phase-shift keyed and the amplitude-modulated signals. We have determined the expressions for the probabilities...
We considered the modeling problem of radio wave propagation processes indoors. We generalized all physical phenomena influencing the result. We also suggested the model for the radio-wave attenuation calculation and studied a radiowave attenuation into lossy dielectric. As a result, we obtained the analytical expressions that makes it possible to calculate a radio wavefront (angle of refraction),...
We have developed a pilot high-speed device for protection of AC HV transmission lines and electrical distribution plants of 110 kV from very high short circuit currents up to 80 kA. This device being named as the high-voltage high-speed commutator (VBK-110) is designed on module principle. Each unified module contains a powerful triggered vacuum switch (TVS) of RVU-53-type controlled by a powerful...
The innovative electric motor concept is presented. The main feature of the novel concept is accommodation of relatively large axial channels in a slim electric motor without sacrificing its torque density and radial dimensions. The motor is analyzed and the analysis is then validated by the experiments. The resulting motor performances are given and applications for the motor proposed.
Structure optimization and the results of the functional modules development for high power modulator for klystrons, magnetrons, gyrotrons and other microwave vacuum devices are under discussion. Main goal is in the increasing of pulse form stability, breakdown protection and modulator's energy efficiency. The fields of preferable application for basic types of power switching devices in high power...
We report new design of solar panels with application of single and multi-junction solar cells (SC) based on GaAs/Ge, GaInP/GaAs/Ge located on mesh semi-rigid frames. Earlier the similar frames were used in development of many types of SA based on mono-Si for Russian spacecrafts. Their application in case of highly effective SC based on GaAs/Ge, GaInP-GaAs/Ge is considered for the first time and is...
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