DIFFERENTIAL PHASE DIRECTION FINDING ERRORS FOR EMITTERS WITH PHASE-ANGLE DEPENDENCE

2020 ◽  
Author(s):  
В.Н. ЮДИН ◽  
А.М. ВОЛКОВ
Keyword(s):  
Phase Angle ◽  
Phase Difference ◽  
Direction Finding ◽  
Differential Phase ◽  
Angle Dependence ◽  
Direction Finder ◽  
Phase Direction

Выведены формульные соотношения для расчета ошибок пеленгования парного излучателя с использованием разностно-фазового пеленгатора. Оценено влияние различных параметров парного излучателя на величину ошибки пеленгования этого излучателя. Formula relations for calculating the direction finding errors of a paired transmitter using a phase difference direction finder are derived. The influence of various parameters of a paired radiator on the magnitude of the direction finding error of this radiator is estimated.

scholarly journals EVALUATION OF ERRORS CAUSED BY FALURE OF ANTENNA SYSTEM ELEMENTS INAN AERODROME AUTOMATIC RADIO DIRECTION FINDER

2018 ◽  
Vol 45 (2) ◽  
pp. 94-103 ◽  
Author(s):  
G. Т. Aslanov ◽  
T. G. Aslanov ◽  
R. B. Kazibekov ◽  
U. R. Tetakaev
Keyword(s):  
Mathematical Model ◽  
Radio Emission ◽  
Radio Source ◽  
Direction Finding ◽  
Antenna System ◽  
Fourier Series Expansion ◽  
Mutual Position ◽  
Differential Phase ◽  
Direction Finder ◽  
The Difference

ObjectivesThe aim of the study is to develop a mathematical model for determining the direction-finding error of an aerodrome automatic direction finder (ADF), depending on the position of the defective vibrator relative to the source of radio emission.MethodsTo determine the direction-finding error depending on the mutual location of the defective ADF vibrator and direction finding towards the radio source, the method of Fourier series expansion of step-by-step sampling of the signal phases is used. The direction-finding error is defined as the difference in the sum of the first harmonics of the phase sample’s stepped envelope Fourier expansion of the fault-free and defective antenna systems.ResultsIn this work, a mathematical model is obtained for determining the direction-finding error of the aerodrome automatic direction finder (ADF), depending on the mutual position of the defective vibrator and direction finding towards the radio source. The graph of the alteration of the ADF direction finding error is obtained depending on the position of the defective vibrator and the direction finding towards the source of radio emission. It is shown that during ADF operating in the quasi-Doppler mode, the failure of the vibrators located along the direction finding towards the source of radio emission does not lead to an error in direction finding. Conversely, during ADF operating in the differential-phase mode, the failure of the vibrators located along the direction finding towards the source of radio emission leads to a maximum direction-finding error, reaching 3.75є.ConclusionWhen an aerodrome automatic direction finder (ADF) operates in a quasi-Doppler mode, the failure of the vibrators located along the direction finding towards the source of radio emission does not lead to an error in direction finding and, conversely, when the ADF operates in differential phase mode, this results in a maximum direction-finding error of 3.75є.

Use of Monopulse Difference-Phase Direction Finding Method for Location of Air Targets in Active-Passive Systems with Noise-Like Signal

2005 ◽  
Vol 63 (10) ◽  
pp. 863-869 ◽  
Author(s):  
Ye. N. Belov ◽  
Ye. M. Zarichnyak ◽  
V. I. Lutsenko ◽  
I. V. Lutsenko ◽  
V. G. Yakovlev
Keyword(s):  
Direction Finding ◽  
Passive Systems ◽  
Phase Direction ◽  
Finding Method

Phase direction finding in forward-scattering radars

2014 ◽  
Vol 59 (4) ◽  
pp. 173-175 ◽  
Author(s):  
F. N. Kovalev ◽  
V. V. Kondrat’ev
Keyword(s):  
Direction Finding ◽  
Forward Scattering ◽  
Phase Direction

Multiple Frequency Tympanometry

1993 ◽  
Vol 36 (1) ◽  
pp. 178-185 ◽  
Author(s):  
Janet E. Shanks ◽  
Richard H. Wilson ◽  
Nancy K. Cambron
Keyword(s):  
Phase Angle ◽  
Phase Difference ◽  
Middle Ear ◽  
Multiple Frequency ◽  
Ear Canal ◽  
Sweep Frequency ◽  
Difference Curve ◽  
Angle Measurements ◽  
Rectangular Form ◽  
Acoustic Admittance

Three methods for compensating multiple frequency acoustic admittance measurements for ear canal volume were studied in 26 men with normal middle ear transmission systems. Peak compensated static acoustic admittance (| y |) and phase angle (ø) were calculated from sweep frequency tympanograms (226–1243 Hz in 113 Hz increments). Of the procedures used to compensate for volume in rectangular form, the ear canal pressure used to estimate volume had the largest effect on the estimate of middle ear resonance. Median resonance was 800 Hz for admittance measurements compensated at 200 daPa versus 1100 Hz for measurements compensated at –350 daPa. The remaining two methods, compensation of susceptance only versus both susceptance and conductance and compensation using the minimum volume versus separate volumes at each frequency, did not affect estimates of middle ear resonance. Estimates of middle ear resonance from compensated phase angle measurements also were compared with estimates of resonance from admittance and phase difference curves. although resonance could not be estimated from the phase difference curve, resonance estimated from the admittance difference curve agreed with the estimate from compensated phase angle.

scholarly journals Method for phase direction finding of signals with asymmetric spectra

2020 ◽  
Vol 1515 ◽  
pp. 022051
Author(s):  
A O Zhukov ◽  
I N Valyaev ◽  
V P Kovalenko ◽  
Z N Turlov ◽  
I V Minin ◽  
...  
Keyword(s):  
Direction Finding ◽  
Phase Direction ◽  
Asymmetric Spectra

Phase-angle dependence study of modulated e.s.r. and ENDOR signals from coal samples

Fuel ◽  
1986 ◽  
Vol 65 (11) ◽  
pp. 1588-1593 ◽  
Author(s):  
Kaoru Shibata ◽  
Chester Alexander ◽  
Ichiro Miyagawa
Keyword(s):  
Phase Angle ◽  
Angle Dependence

scholarly journals A Deterministic Approach Used for Solving the Problem of Positioning and Angular Orientation Defining of Onboard Direction-Finder Antenna Based on the Results of Radio Direction Finding of Radio Reference Points

2020 ◽  
pp. 289-310
Author(s):  
Valery N. Tyapkin ◽  
Alexander D. Vinogradov
Keyword(s):  
Radio Signal ◽  
Direction Finding ◽  
Reference Points ◽  
Moving Object ◽  
Angular Orientation ◽  
Signal Delay ◽  
Direction Finder ◽  
Object Based ◽  
Signal Delay Time

The paper considers the possibilities and conditions for the unambiguous determination of the coordinates and angular orientation of the onboard direction – finder antenna placed on a moving object, based on the results of the azimuth-elevation radio direction finding of radio reference points. The coordinates of a moving object are determined by taken at one or several receiving points on board of a moving object measurements of radio signal delay time emitted simultaneously by at least three radio reference points. The unambiguous angular orientation in space is determined by measuring the viewing angles of at least three radio reference points of at least two direction finding pairs of receiving points with intersecting (non-collinear) bases. The article presents the mathematical features of determining the spatial position of onboard DF antenna, a general approach used for solving the problem of azimuth-elevation radio direction finding of three radio reference points, methods for determining the distance to radio reference points based on the results of their azimuth-elevation radio direction finding, and the analysis of the research results

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