ИНТЕГРИРУЕМЫЙ В СИСТЕМУ КВ-СВЯЗИ КОМПЛЕКС ПАССИВНОГО ЗОНДИРОВАНИЯ УПОРЯДОЧЕННОГО ПО ЧАСТОТЕ МНОЖЕСТВА УЗКОПОЛОСНЫХ КАНАЛОВ
Authors: Иванов Д.В. , Иванов В.А. , Рябова Н.В. , Бельгибаев Р.Р. 
Published: February 2025

Решалась задача создания пассивного ЛЧМионозонда для интеграции в действующие системы КВсвязи. Он предназначен для диагностики многомерного КВрадиоканала. Разработана методика определения основных параметров каждого из упорядоченных по частоте множества парциальных каналов с полосой частот 3 кГц, а также полосы прозрачности линии связи. На базе стандартного связного приёмника разработаны блоксхема, алгоритм работы и аппаратнопрограммный комплекс пассивного зондирования.

Introduction. Currently, relations between narrowband HF communication modem parameters and ionospheric fluctuating channel parameters have been stated. It allows to estimate modem performance with the use of the sounding data. Methods of cognitive HF communication are currently being developed. Such communication requires experimental data on the state of the whole of channels, that exist on the radio path. The following tasks are topical: measuring channel availability for the selected digital HF communication modem and increasing communication efficiency by up to its potential level. At the same time, there has been an acute problem of creating a lowcost integrated version of a multifrequency probe for existing systems. At the same time, there has been a burning need for lowcost multifrequency sounder integratable with the existing systems. The aim of the research scientific justification, development and study of algorithms, methods and software to implement passive sounder integratable with communication system for actual estimating current state of multiple narrowband HF ionospheric channels. Research method. To solve the problem in question we used matched filtering method for narrowband elements of the ultrawideband chirp signal to obtain impulse response of each partial channel. Doppler spread is estimated according to regression equation derived on the basis of the research that was carried out by A. J. Stocker, E. M. Warrington и D. R. Siddle из University of Leicester (UK). Signaltonoise ratio required for reliable operation of a communication system is recalculated from the signaltonoise ratio measured by the ionosonde. To prove the adequacy of developed algorithms we carried out numerical experiment. Findings. Block scheme, operation algorithm and hardware software complex of passive sounding, based on typical communication receiver, were developed. New application software package has been created to implement developed algorithms of quadrature correlation processing of narrowband elements of chirp signal. To pair typical receiver with PC communication interface has been developed. It was shown that due to the lack of data on the current HF channel conditions signal energy should be raised by increasing the amount of transmit power or decreasing data rate (or even both simultaneously). Practical significance. Developed passive chirp sounder can be integrated with stateoftheart HF communication systems and is aimed at diagnosing multiple HF radio channels.