Development of practical methods for increasing electromagnetic compatibility in atmospheric radio sounding systems

Ivan Malygin,Sergey Kudinov

doi:10.1051/itmconf/20193012013

Abstract

During the operation of atmospheric radio sounding systems, there appears a two-sided problem of electromagnetic compatibility with other radio-electronic systems for various purposes, ground, air and space based. Out-of-band emissions from upper-air radiosonde transmitters interfere with global satellite navigation systems and cellular systems. The paper presents the analysis of methods for reducing out-of-band emissions of aerological radiosondes and proposes the use of technology of spread spectrum communication systems in aerological complexes.

Highlights

Radio sounding systems (RSS) of the atmosphere are designed to obtain the most accurate aerological information about the thermodynamic parameters of free atmosphere, such as temperature, humidity, pressure, direction and wind speed at an altitude from ground level to 35–40 km
For further level reduction of out-of-band emissions of the aerological radiosondes (ARS), the BSSs properties modulated by pulses of a rectangular and a Gaussian shape are compared by modelling in a Matlab environment, Fig. 1
As a result of the analysis, in order to reduce spurious emissions, methods were identified that could be implemented in RSS for optimizing the shape of modulating information pulses using Gaussian filtering, spread spectrum communication signal technology, and filtering the output radiation of the ARS transmitter with a SAW filter

Summary

Introduction

Radio sounding systems (RSS) of the atmosphere are designed to obtain the most accurate aerological information about the thermodynamic parameters of free atmosphere, such as temperature, humidity, pressure, direction and wind speed at an altitude from ground level to 35–40 km. In the Russian Federation, there are radar and radio navigation RSS in operation [1]. Abroad there used a radio-navigation RSSs type produced by the following manufacturers such as Vaisala, Graw, Modem, Meteolabor, Sippican, etc. During the operation of the RSS, there appears a two-sided problem of electromagnetic compatibility (EMC) with other radio-electronic means (REM) for various purposes, ground, air and space based. In the development of ARS, there are taken well-known structural and technological measures to improve EMC characteristics. Due to the minimization of cost and ARS flight mass these methods cannot be fully used

Problem statement

Development of spread spectrum equipment for a RSS

Radiosonde transmitter design

Development of a receiving device of spread spectrum signals

Conclusion