I.Yu. Eremeev1, I.V. Demichev2, Z.F. Schaidulin3, N.P. Shmakov4, D.A. Lukichev5

1Military Space Academy named after A.F. Mozhaisky (Saint-Petersburg, Russia)

2−5Military University of Radio Electronics (Cherepovets, Russia)

In the design and operation of various radio engineering systems, in a broad sense, a special place is given to the analysis of radio lines, on the basis of which the functioning of these systems is ensured. One of the main indicators characterizing the quality of radio engineering systems is the provision of electromagnetic availability of radio emission sources that form the technical basis of radio engineering systems. The analysis of regulatory and scientific and technical documentation shows a variety of methods for assessing electromagnetic availability. The various sources of electromagnetic availability terminology is defined, and in some cases is identified with the concepts of stability, sensitivity, probability of error, range, coverage area, etc.

The purpose of this article is to develop a systematic approach to the evaluation of electromagnetic availability of complex radio systems and analysis of the conditions of its provision, as well as obtaining mathematical reasoning and relevant expressions linking the accuracy of the estimated coordinates and the probability of operation of multiple radio system with the required quality.

Depending on the intended purpose, any radio engineering system is characterized by certain quality indicators. Generalizing radio engineering systems for the intended purpose, two main classes can be distinguished: those that provide the transmission of radio communications messages and those that provide the measurement of coordinates. For connected radio engineering systems, a generalized quality indicator can be the probability of reliable reception of a radio communication message, and for coordinate radio engineering systems – the accuracy of coordinate estimation. As is known, the root-mean-square error of the coordinate estimation depends on the accuracy of the measurement of the position parameter and is determined taking into account the geometric factor. At the same time, in either case, both indicators will depend on the signal-to-noise ratio at the input of the terminal device or the coordinate-informative parameter meter. The evaluation of these indicators is carried out in conditions of a limited time-frequency and energy resource of the radio line. The signal-to-noise ratio at the input of the position parameter meter and the instrumental accuracy of the radio direction finder determine the probability of electromagnetic availability when the radio source is located.

It is known that the position parameter has an explicit functional relationship with the position line, and it, in turn, with the coordinates of the radio source. At the same time, it should be noted that when the position parameter is transformed into position lines, the laws of distribution of random variables are transformed, but the probability of electromagnetic availability remains unchanged.

As a result, the systematization of concepts and terms used in assessing electromagnetic availability has been carried out. The concept of electromagnetic availability is defined as one of the properties of a radio engineering system that characterizes the ability to function with a given quality. Approaches to the estimation of electromagnetic availability in navigation radio engineering systems and systems for determining the location of radio sources are proposed. A mathematical justification and corresponding expressions linking the accuracy of the coordinate estimation and the probability of functioning of a multi-position radio engineering system with the required quality are obtained. Thus, a method for assessing the electromagnetic availability of radio sources in multi-position radio engineering systems is proposed, and it allows to evaluate the integral quality indicator from a single position when using heterogeneous, multi-current meters.

Eremeev I.Yu., Demichev I.V., Schaidulin Z.F., Shmakov N.P., Lukichev D.A. Methodology for assessing electromagnetic availability in multi-position radio engineering systems. Electromagnetic waves and electronic systems. 2022. V. 27. № 2. P. 5−11. DOI: https://doi.org/10.18127/j15604128-202202-01 (in Russian)

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