Abstract. The
effects of impulse noise, re-reflected signals from closely located reflectors,
high-power signals in neighboring radio-frequency channels, as well as the
orientation of the antenna relative to the direction-finding plane on the
accuracy of radio direction finding are considered. Methods for compensating
the effect of impulse noise on the probability of correct detection due to a
digital two-threshold accumulation are proposed, and the accuracy of
determining bearing by forming the direction-finding characteristic by the
method of averaging the logical primary features in the "sliding"
angular sector corresponding to the directions to the source in each antenna
revolution. A method for increasing the frequency selectivity of the
differential phase finder by means of blanking of switching pulses is also
proposed, which makes it possible to exclude the spectral components of the
linear spectrum of the frequency-tuned signal from the useful signal band. A
method for compensating for direction errors caused by the deviation of the
antenna from the direction-finding plane is shown, using a special algorithm in
which information about the orientation of the carrier determined by the angles
of pitch and roll is used. Also, a method is proposed for correcting the
direction-finding errors caused by signal reflections from the structures of
the radio direction-finder antenna carrier with the help of pre-introduced
calibration coefficients that allow us to extrapolate the possible error in an
arbitrary direction and in this way compensate them.
Keywords:
navigation, direction finding, detection, frequency selectivity, Doppler
effect.
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