UDC 621.396
REFERENCE SIGNAL FORMATION WHEN MEASURING DISTANCE WITH FM RANGE FINDER BY MAXIMUM LIKELIHOOD METHOD
V. S. Parshin, Dr. Sc. (Tech.), full professor, department of radio control and communication, RSREU, Ryazan, Russia;
orcid.org/0000-0003-4599-2560, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V. D. Nguyen, post-graduate student RSREU, Ryazan, Russia;
orcid.org/ 0000-0002-3309-1290, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The article analyzes the error in estimating the distance by rangefinder with frequency modulation of the emitted signal, caused by the influence of interfering reflectors. The reason for the appearance of interfering reflections is the presence of parasitic reflecting elements in rangefinder working area, along with useful reflector. Reducing the influence of interfering reflectors on the accuracy of distance estimation is achieved by including in reference signal composition the likelihood function of the component caused by the influence of interference. The specificity of interference caused by interfering reflectors is that it is a signal with non-random unknown parameters. To include such interference in reference signal composition of likelihood function, it is necessary to estimate its amplitude, phase. The aim of this work is to determine the error in measuring the distance when including in reference signal composition the likelihood function of the signal corresponding to interference, with a preliminary estimate of its amplitude and phase
Key words: : maximum spectral component, maximum likelihood method, interfering reflectors, distance measurement error, frequency ranging, likelihood function, difference frequency signal, reference signal, interference amplitude, interference location.