MATLAB MODELS FOR WEATHER SATELLITE IMAGES TRANSMITTION AND RECEIVING SIMULATION

Abstract

Studying and developing complex radio-electronic systems is almost impossible without creating their mathematical models. This article discusses three MATLAB models, which includes the formation, transmission and reception the images of the Earth and the atmosphere, obtained by low-orbit meteorological NOAA and METEOR-M satellites in various transmission formats (APT, HRPT, LRPT). The use of this models, allows us to simplify the studying of the methods and algorithms of analog and digital transmission and reception of satellite images without the use of hardware and software for direct reception satellite signals. Introduction. Artificial Earth satellites (AES) provide us with a unique opportunity to look at the Earth from space. Meteorological satellites give us information about the formation and movement of clouds, ocean currents, temperature of the Earth’s surface, weather conditions, atmosphere and other factors affecting our lives. The most popular of this kind of services today are the Automatic Picture Transmission (APT) and High-Resolution Picture Transmission (HRPT) of the U.S. National Oceanic and Region Administration (NOAA) system [1], and Low-Rate Picture Transmission (LRPT) of the European METOP and METEOR-M systems [2]. A growing interest in such data and the means of obtaining them has been observed recently in the educational community. Especially useful is the work with these systems in the study of modern methods of encoding, transmission and reception of data in digital and analog ways. At the same time, work with real satellite signals does not allow to fully understand the meaning and technical content of those operations that were performed on them in the process of transmission and reception. Much more visual is the work with their mathematical and software models. The development and research of the software model that implements the transmission and reception of satellite images in APT, HRPT and LRPT formats is the subject of this work. The transmission of meteorological images in the analog APT format has many attractive features available frequency band for transmission (137-138 MHz), simple devices and programs for receiving and processing APT data, understandable data format. In addition, there are currently a lot of simple and cheap Software Defined Radio (SDR) receivers, which allow, using a personal 24  Integración de las ciencias fundamentales y aplicadas en el paradigma de la sociedad post-industrial  Volumen 2