Ccuracy of measurement of the information parameter of the signal by a tracking meter in aviation and rocket and space technology against the background of additive and multiplicative interference. The spectral density of the discriminator output signal. Part II

2021 ◽  
pp. 3-10
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Spectral Density ◽  
Output Signal ◽  
Space Technology ◽  
Information Parameter ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Multiplicative Interference

Рассмотрено и проанализировано влияние мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения одного информационного параметра следящим измерителем. Проанализирована спектральная плотность выходного сигнала дискриминатора . The influence of multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of one information parameter by a tracking meter is considered and analyzed. The spectral density of the discriminator output signal is analyzed .

Accuracy of measurement of the signal information parameter in aviation and space-rocket radio systems in the presence of additive and multiplicative interference with a low level

2020 ◽  
pp. 3-12
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Low Level ◽  
Energy Parameters ◽  
Space Rocket ◽  
Useful Signal ◽  
Information Parameter ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Radio Systems ◽  
Multiplicative Interference

Рассмотрено и проанализировано влияние флуктуационных стационарных мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения неэнергетических параметров информационных сигналов. Показано, что при низком уровне мультипликативных и аддитивных помех оценка одного параметра полезного сигнала оказывается несмещенной, а ее дисперсия представляет сумму двух слагаемых, первое учитывает влияние аддитивных помех, второе - мультипликативных. Наиболее опасными являются медленные мультипликативные помехи. The influence of fluctuating stationary multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of non-energy parameters of information signals is considered and analyzed. It is shown that at a low level of multiplicative and additive interference, the estimation of one parameter of the useful signal is unbiased, and its dispersion is the sum of two terms, the first takes into account the influence of additive interference, the second - multiplicative. Slow multiplicative interference is the most dangerous.

Accuracy of measurement of the signal information parameter in aviation and space-rocket radio systems in the presence of additive and multiplicative interference with a low level

2020 ◽  
pp. 24-34 ◽  
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Low Level ◽  
Energy Parameters ◽  
Space Rocket ◽  
Useful Signal ◽  
Information Parameter ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Radio Systems ◽  
Multiplicative Interference

Рассмотрено и проанализировано влияние флуктуационных стационарных мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения неэнергетических параметров информационных сигналов. Показано, что при низком уровне мультипликативных и аддитивных помех оценка одного параметра полезного сигнала оказывается несмещенной, а ее дисперсия представляет сумму двух слагаемых, первое учитывает влияние аддитивных помех, второе - мультипликативных. Наиболее опасными являются медленные мультипликативные помехи. The influence of fluctuating stationary multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of non-energy parameters of information signals is considered and analyzed. It is shown that at a low level of multiplicative and additive interference, the estimation of one parameter of the useful signal is unbiased, and its dispersion is the sum of two terms, the first takes into account the influence of additive interference, the second - multiplicative. Slow multiplicative interference is the most dangerous.

Accuracy of measurement of the signal information parameter tracking meter in the aviation and space rocket industry technology against the background of additive and multiplicative interference. The steepness of the discriminatory specifications. Part I

2021 ◽  
pp. 26-37
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Discrimination Characteristic ◽  
Space Rocket ◽  
Information Parameter ◽  
Parameter Tracking ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Multiplicative Interference

Рассмотрено и проанализировано влияние мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения одного информационного параметра следящим измерителем. Проанализирована крутизна дискриминационной характеристики следящего измерителя . The influence of multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of a single information parameter by a tracking meter is considered and analyzed. The steepness of the discrimination characteristic of the tracking meter is analyzed.

Accuracy of measuring the frequency and time of arrival of a useful signal in aviation and space-rocket radio systems at presence of additive and multiplicative interference with low level

2021 ◽  
pp. 3-15
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Frequency Measurement ◽  
Signal Frequency ◽  
Time Of Arrival ◽  
Low Level ◽  
Energy Parameters ◽  
Space Rocket ◽  
Useful Signal ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Multiplicative Interference

Произведена оценка влияния флуктуационных стационарных мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения неэнергетических параметров информационных сигналов. Показано, что мультипликативная помеха низкого уровня оказывает более сильное влияние на точность измерения времени прихода, чем на точность измерения частоты полезного сигнала. Осуществлена количественная оценка влияния мультипликативной помехи на точность измерения неэнергетических параметров полезного сигнала. The influence of fluctuating stationary multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of non-energy parameters of information signals is estimated. It is shown that low-level multiplicative interference has a stronger effect on the accuracy of the arrival time measurement than on the accuracy of the useful signal frequency measurement. A quantitative assessment of the effect of multiplicative interference on the accuracy of measurement of non-energy parameters of the useful signal is carried out.

System analysis of modeling the accuracy of joint measurement of two information parameters of a signal

2021 ◽  
pp. 91-103
Author(s):  
В.И. Воловач
Keyword(s):  
System Analysis ◽  
Time Of Arrival ◽  
Joint Measurement ◽  
Useful Signal ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Multiplicative Interference

Проведен системный анализ влияния мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения двух информационных параметров полезного сигнала. Получены зависимости влияния мультипликативных помех на точность измерения частоты и времени прихода радиоимпульсов . The system analysis of the influence of multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of two information parameters of the useful signal is carried out. The dependences of the influence of multiplicative interference on the accuracy of measuring the frequency and time of arrival of radio pulses are obtained.

Accuracy of measurement of the signal information parameter in aviation and space-rocket radio systems in the presence of additive and multiplicative interference with a low level. Part 2 (Examples of frequency and arrival time measurements useful signal)

2020 ◽  
pp. 14-26
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Arrival Time ◽  
Frequency Measurement ◽  
Signal Frequency ◽  
Low Level ◽  
Energy Parameters ◽  
Space Rocket ◽  
Useful Signal ◽  
Additive Interference ◽  
Accuracy Of Measurement ◽  
Multiplicative Interference

Произведена оценка влияния флуктуационных стационарных мультипликативных помех, действующих одновременного с аддитивными помехами, на точность измерения неэнергетических параметров информационных сигналов. Показано, что мультипликативная помеха низкого уровня оказывает более сильное влияние на точность измерения времени прихода, чем на точность измерения частоты полезного сигнала. Осуществлена количественная оценка влияния мультипликативной помехи на точность измерения неэнергетических параметров полезного сигнала. The influence of fluctuating stationary multiplicative interference acting simultaneously with additive interference on the accuracy of measurement of non-energy parameters of information signals is estimated. It is shown that low-level multiplicative interference has a stronger effect on the accuracy of the arrival time measurement than on the accuracy of the useful signal frequency measurement. A quantitative assessment of the effect of multiplicative interference on the accuracy of measurement of non-energy parameters of the useful signal is carried out.

On-Line Gauge for Wire and Fibre Diameter Measurement

1974 ◽  
Vol 7 (2) ◽  
pp. 45-46 ◽  
Author(s):  
Patricia West
Keyword(s):  
Output Signal ◽  
Size Range ◽  
Fibre Diameter ◽  
Laser Diffraction ◽  
Control Mode ◽  
Absolute Accuracy ◽  
Diameter Measurement ◽  
Line Measurement ◽  
On Line ◽  
Accuracy Of Measurement

A new gauge has recently been developed for on-line measurement of filament diameters in the size range 5–160 microns. The instrument, which operates on a laser diffraction principle, has been designed for non-contacting gauging of wires, filaments and fibres on the production line. It can accept horizontal or vertical wires, and it can readily be moved from one line to another, and used in the laboratory or test bay. The absolute accuracy of measurement attainable is approximately 1% of the diameter of the filament, while the sensitivity of the gauge to changes in diameter is about 0· 2%. The deviation from nominal diameter is displayed on a meter, or can be recorded automatically. It is possible to use the output signal from the instrument in a control mode to correct the diameter of the wire under production.

scholarly journals New type of Piezoresistive Pressure Sensors for Environments with Rapidly Changing Temperature

2017 ◽  
Vol 24 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Myroslav Tykhan ◽  
Orest Ivakhiv ◽  
Vasyl Teslyuk
Keyword(s):  
Output Signal ◽  
Variable Temperature ◽  
Linear Thermal Expansion ◽  
Pressure Sensors ◽  
Practical Implementation ◽  
Sensor Output ◽  
New Type ◽  
Accuracy Of Measurement ◽  
Piezoresistive Pressure Sensors ◽  
Physical Principles

Abstract The theoretical aspects of a new type of piezo-resistive pressure sensors for environments with rapidly changing temperatures are presented. The idea is that the sensor has two identical diaphragms which have different coefficients of linear thermal expansion. Therefore, when measuring pressure in environments with variable temperature, the diaphragms will have different deflection. This difference can be used to make appropriate correction of the sensor output signal and, thus, to increase accuracy of measurement. Since physical principles of sensors operation enable fast correction of the output signal, the sensor can be used in environments with rapidly changing temperature, which is its essential advantage. The paper presents practical implementation of the proposed theoretical aspects and the results of testing the developed sensor.

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

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