Managing of microwave antennas of digital combined radio relay-troposcatter station

Abstract

The usage of the communication systems in emergency situations is requiring the mobile stations of telecommunication. Therefore, the use of digital combined radio relay-troposcatter stations (DCRRTS) is fully justified. Proper selection of microwave antennas systems (MAS) largely determines the functional efficiency of mobile stations of telecommunication. In the elaboration of the DCRRTS one of the important issues is the selection of MAS that support two modes of operation: direct radio line (radio relay communication) and the out skyline (troposcatter communication). On the basis of the main advantages of reflector antennas -sufficient simplicity and reliability of a design, its transportability, the possibility of forming the required pattern, high gain, low noise temperature. This is the type of antennas is proposed to use in DCRRTS. For DCRRTS may be offered the next option to usage the following antennas: axisymmetric monoreflectible antenna for radio relay component of station and unaxisymmetric monoreflectible antenna for troposcatter component of station. Therefore there is a need to develop a control algorithm that automatically transfers station from one mode to another. This algorithm includes control of mechanical parts DCRRTS and its electrical characteristics.The usage of the communication systems in emergency situations is requiring the mobile stations of telecommunication. Therefore, the use of digital combined radio relay-troposcatter stations (DCRRTS) is fully justified.Proper selection of microwave antennas systems (MAS) largely determines the functional efficiency of mobile stations of telecommunication. One of the important issues in the elaboration of the DCRRTS is the selection of MAS that support two modes of operation: direct radio line (radio relay communication) and the out skyline (troposcatter communication).DCRRTS operates in two frequency bands: the radio relay mode 7.9 ... 8.4 GHz; the troposcatter mode 4.4 ... 4.8 GHz. These ranges are in accordance with the National Table of Frequency Allocations refer to fixed public.On the basis of the main advantages of reflector antennas -sufficient simplicity and reliability of a design, its transportability, the possibility of forming the required pattern, high gain, low noise temperature. This is the type of antennas is proposed to use in DCRRTS.According to given, DCRRTS can work in troposcatter mode (out skyline communication), which is characterized by high power output, which can reach hundreds of W or even some kW, and with regard to the requirements for mobile stations option there are several advantages to monoreflectible antennas from dualreflectible antennas: less side lobe level for angular directions; lower cost; smaller irradiator.Monoreflectible antenna methods of execution form of the reflector are divided into axisymmetric and not axisymmetric.For DCRRTS may be offered the next option to usage the following antennas: axisymmetric monoreflectible parabolic antenna diameter of 0.9 m with a gain of 35 dB for radio relay ...