Анализ географической доступности расширенного контроля целостности измерений BDS-2 и BDS-3 при заходе на посадку по LPV-200

Благодаря увеличению количества навигационных спутниковых систем и расширению номенклатуры их сигналов с помощью аппаратуры спутниковой навигации стало возможным выполнять заход на посадку в условиях отсутствия визуального контакта с Землей до высоты принятия решения 200 футов (61 м), т.е. в соответствии с процедурой LPV-200. Необходимый для этого уровень надежности навигационных решений обеспечивает алгоритм расширенного автономного контроля целостности спутниковых данных – Advanced Receiver Autonomous Integrity Monitoring (ARAIM). В статье рассматривается АRAIM для двухчастотных безыоносферных комбинаций псевдодальностей BeiDou второго и третьего поколений (BDS-2 и BDS-3). Для расчета уровня безопасности по высоте (vertical protection level – VPL) в ARAIM использовалось гипотетическое сообщение для поддержки контроля целостности (integrity support message – ISM). Выполнена оценка влияния различных параметров ISM на доступность ARAIM в зависимости от места расположения потребителя. Результаты показывают, что географическая доступность ARAIM для BDS-2+BDS-3 несколько выше по сравнению с одной BDS-3 главным образом благодаря большему числу видимых спутников. Доступность системы BeiDou в Северной и Южной Америке зависит от точности измерения дальности от спутника до потребителя (user range accuracy – URA). При сокращении URA с 2,0 до 0,5 м доступность ARAIM для BDS-2+BDS-3 в Северной и Южной Америке увеличивается с 50 до 99,9%.

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