Description: One of the requirements for radar information is the accuracy of measuring the coordinates by targets, in particular, their azimuth. In the survey radars of the "old" park, the antenna azimuth is determined by means of synchronous-tracking drives made on the basis of selsyns or sinusoidal-cosine rotating transformers. The processing of signals from their output is carried out by devices executed on a lamp element base. Therefore, errors in measuring the azimuth of targets are relatively large. To improve the accuracy of determining the current antenna azimuth, variants of existing azimuth measurement devices implemented in different types of survey radars are analyzed. It is shown that one of the options is the use of modern digital converters "corner-code" (encoders). But their embodiment in analog radar is inappropriate. Other variants include the use of a synchronous-tracking drive of selsyns or sinusoidal-cosine rotary transformers. It is proposed to increase the accuracy of the determination of azimuth in the survey radars of the "old" park of the radar using existing in these stations selsyn-sensors from the composition of the muddy pair. The signals from the output of synchronization windings of the selsyn-sensor are digitized. The ratio of the values of these three signals generates the code of the current position of the antenna and the azimuth marks. It is shown that the accuracy of measuring azimuth in the proposed method increases several times. The resultant error is due to the discretization of reference voltages from the output of the selsyn-sensor and the method of forming large-scale azimuthal pulses. For the survey radars of the "old" park, a circuit diagram of the digital azimuth measuring device is used which uses signals from the output of synchronization windings of the selsyn-sensor. It is recommended to use such a device under the conditions of using the LED-monitor on the basis of a circular indicator on analogue stations.
Keywords: radar station, synchronous-tracking drive, encoder, selsyn, rotary transformer, azimuth label