War has accompanied Man since his beginnings. With the development of human society and its technological advancement, the forms of warfare also changed with it. In an armed conflict, technology is an important factor that can tip the balance of power to the side which can better use and apply it. With the discovery and first use of electromagnetic waves, a new dimension of warfare opened up. If at first the war was fought on land, water and air, later the conflict spread to the field of electromagnetic spectrum (EMS), which became an important commodity, useful first for communications, but later also for radar and sighting systems. Just as the use of radio communications and other devices using the electromagnetic spectrum is indispensable in the civilian world, the paralysis of such systems can lead to the breakdown of an entire military organization that has adapted its operations to the use of such modern technologies.
The diploma work is divided into two parts. The first presents modern electronic warfare, its features and technologies in current use. The second part describes the assembly and operation of a simple spectrum analyzer based on a software defined radio and a Raspberry Pi computer. Finally, measurements of the LTE signal transmitter strength in a given area are presented.
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