
Объект иÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ â€“ Ñигналы в задаче Ñпутниковой геолокации. Цель работы – повышение вероÑтноÑти Ð¾Ð±Ð½Ð°Ñ€ÑƒÐ¶ÐµÐ½Ð¸Ñ Ñигнала в задаче Ñпутниковой геолокации путём Ð¿Ñ€Ð¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð°Ð»Ð³Ð¾Ñ€Ð¸Ñ‚Ð¼Ð° оценки коÑффициента Доплера в уÑловиÑÑ… его изменениÑ. Тема выпуÑкной квалификационной работы: компенÑÐ°Ñ†Ð¸Ñ Ñффекта Доплера в задаче Ñпутниковой геолокации. Работа поÑвÑщена алгоритму оценки и компенÑации влиÑÐ½Ð¸Ñ Ñффекта Доплера в уÑловии Ñложного Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð¸Ñточника Ð¸Ð·Ð»ÑƒÑ‡ÐµÐ½Ð¸Ñ Ð¿Ð¾ поверхноÑти Земли. Сутью разработанного алгоритма ÑвлÑетÑÑ Ñ€Ð°Ð·Ð±Ð¸ÐµÐ½Ð¸Ðµ обрабатываемых Ñигналов на короткие временные интервалы, в результате чего задача по оценке Ñложной завиÑимоÑти доплеровÑкого Ñдвига чаÑтоты ÑводитÑÑ Ðº неÑкольким проÑтым задачам оценки линейной завиÑимоÑти чаÑтотного ÑÐ¼ÐµÑ‰ÐµÐ½Ð¸Ñ Ñ Ð¿Ð¾Ñледующей компоновкой результатов. Ð”Ð»Ñ Ð¾Ñ†ÐµÐ½ÐºÐ¸ работоÑпоÑобноÑти алгоритма была разработана модель, позволÑÑŽÑ‰Ð°Ñ Ð´Ð»Ñ Ð·Ð°Ð´Ð°Ð½Ð½Ñ‹Ñ… Ñпутников и траектории Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð¸Ñточника Ð¸Ð·Ð»ÑƒÑ‡ÐµÐ½Ð¸Ñ Ñ€Ð°ÑÑчитать завиÑимоÑть доплеровÑкого ÑÐ¼ÐµÑ‰ÐµÐ½Ð¸Ñ Ñ‡Ð°Ñтоты. Ð”Ð»Ñ Ð½ÐµÑкольких таких завиÑимоÑтей было проведено Ñравнение результатов разработанного алгоритма Ñ Ñ€ÐµÐ·ÑƒÐ»ÑŒÑ‚Ð°Ñ‚Ð°Ð¼Ð¸ более проÑтых ÑпоÑобов борьбы Ñ Ñффектом Доплера. Ð’ результате было выÑвлено, что иÑпользование разработанного алгоритма ÑпоÑобÑтвует повышению вероÑтноÑти Ð¾Ð±Ð½Ð°Ñ€ÑƒÐ¶ÐµÐ½Ð¸Ñ Ñигнала на фоне шума. ИÑпользовалиÑÑŒ открытые образовательные реÑурÑÑ‹ и программы поиÑка и анализа информации. Применено программное обеÑпечение MATLAB.
The object of the study is signals in the problem of satellite geolocation. The aim of the work is to increase the probability of detecting a signal in a satellite geolocation problem by applying an algorithm for estimating the Doppler coefficient under conditions of its change. The topic of the final qualifying work: compensation of the Doppler effect in the problem of satellite geolocation. The work is devoted to an algorithm for estimating and compensating the effect of the Doppler effect in the condition of complex motion of a radiation source on the Earths surface. The essence of the developed algorithm is the splitting of the processed signals into short time intervals, as a result of which the task of estimating the complex dependence of the Doppler frequency shift is reduced to several simple tasks of estimating the linear dependence of the frequency shift with subsequent arrangement of the results. To assess the efficiency of the algorithm, a model was developed that allows calculating the dependence of the Doppler frequency shift for given satellites and the trajectory of the radiation source. For several such dependencies, the results of the developed algorithm were compared with the results of simpler ways to combat the Doppler effect. As a result, it was revealed that the use of the developed algorithm contributes to an increase in the probability of detecting a signal against a background of noise. Open educational resources and information search and analysis programs were used. MATLAB software has been applied.
коÑÑелÑÑÐ¸Ð¾Ð½Ð½Ð°Ñ Ð¾Ð±ÑабоÑка, иммиÑаÑионное моделиÑование, ÐÐÐШ, AWGN, satellite geolocation, simulation modeling, correlation processing, Doppler effect, ÑÑÑÐµÐºÑ ÐоплеÑа, ÑпÑÑÐ½Ð¸ÐºÐ¾Ð²Ð°Ñ Ð³ÐµÐ¾Ð»Ð¾ÐºÐ°ÑиÑ
коÑÑелÑÑÐ¸Ð¾Ð½Ð½Ð°Ñ Ð¾Ð±ÑабоÑка, иммиÑаÑионное моделиÑование, ÐÐÐШ, AWGN, satellite geolocation, simulation modeling, correlation processing, Doppler effect, ÑÑÑÐµÐºÑ ÐоплеÑа, ÑпÑÑÐ½Ð¸ÐºÐ¾Ð²Ð°Ñ Ð³ÐµÐ¾Ð»Ð¾ÐºÐ°ÑиÑ
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