Как устроен FT8 изнутри? Поиск и исправление ошибок
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Рассмотрим общую структуру популярного протокола цифровой радиосвязи FT8 и познакомимся с тем, как можно исправлять ошибки в передаваемых сообщениях -------------------------------------------------- Информация взята из статьи: Thomas W. Brooks, KE1R. FT8 Visualized // QST N01, 2024 -------------------------------------------------- 00:00 - потоки данных и любительские виды радиосвязи CW, RTTY, PSK31 и FT8 00:40 - профессор Джозеф Тейлор - астрофизик и радиолюбитель 01:08 - программа WSJT и работа со слабыми сигналами - революция в любительской радиосвязи 01:43 - программа WSJT-X и протокол FT8 02:13 - FT8 и связь через спорадический E-слой ионосферы 02:42 - протокол FT4 02:55 - водопадные потоки данных FT8 04:09 - головоломка судоку и принцип поиска и исправления ошибок 04:43 - как устроены матрицы Костаса 06:06 - матрицы Костаса - сигнатура сообщения FT8 06:23 - кодирование восьми тонов сигнала FT8 07:00 - синхронизация времени при работе с FT8 07:38 - программа JTSync для синхронизации часов 07:54 - поиск ошибок с помощью кода CRC 09:15 - исправление ошибок с помощью кода LDPC 10:21 - формат сообщения FT8: DATA + CRC + LDPC + Costas 11:05 - свистящие звуки FT8 в эфире 11:43 - благодарности Джозефу Тейлору и его команде -------------------------------------------------- Мои видео-обзоры статей из журнала CQ Amateur Radio 1. Радиосвязь и 25ый солнечный цикл https://youtu.be/9IE9nZrpsjk 2. Радиосвязь и полярные сияния https://youtu.be/okIemU4lhNE -------------------------------------------------- Фрагменты занятия "Введение любительскую радиосвязь" для школьников: Плейлист "Любительская радиосвязь" https://youtube.com/playlist?list=PLMWuYRXxklrYg3CZTsul1j7FffYqPoKiP&feature=shared -------------------------------------------------- #радиолюбители #ham #ft8 #crc #ldpc #costas #k1jt #цифроваясвязь
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