Abstract. On the feed line of the
HF radar is influenced by various interference factors. One of these factors
may be temperature change. Under the influence of a randomly changing temperature
the length of the feeder lines changes, and hence the conditions of propagation
of electromagnetic waves can be changed. Unreported changes in the conditions
of propagation of electromagnetic waves leads to the appearance of spurious
phase shifts (phase errors) and as a result the distortion of the
amplitude-phase distribution on the aperture antenna. It is known that the
change of amplitude-phase distribution inevitably changes the shape of the
directivity pattern of the antenna, which is often undesirable.
The aim of this work is to
examine the effect of temperature on the magnitude of phase errors and the
development of structural-functional scheme of the device for automatic
compensation of changes of phase shifts caused by the feeder system, in real
In the article the
analysis of the effect of temperature on the magnitude of phase errors is made,
and also the implementation of the method of compensation of these phase errors
is examine. So, to eliminate distortion of the phase distribution at the aperture
of the antenna array the method of the automatic compensation of phase shifts
in the feeders is proposed. It is based on the introduction of a feedback
channel from the input emitter to the output of the active module and the
implementation of the principles of closed-loop systems. This feedback is the
same feeder, in which vibrations are input to the transmitter. Such system
becomes adaptive to the difference of the lengths of the feeders and change of their
parameters under the influence of uncontrollable external factors.
Key words: phased
antenna array, phase mistakes, feeding line, amplitude-phase distribution.
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