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Начинаем разбираться с событиями TAWS.
Alert Record 34
Present Position Latitude: 54.826754 deg
Present Position Longitude: 32.125595 deg
Terr Conflict Latitude: 54.825680 deg
Terr Conflict Longitude: 32.099149 deg
Terr Conflict Elevation: 754.593200 ft
Airplane Altitude: 1080.053887 ft (329м)
Groundspeed: 177.750000 kts (91м/с)
Estimated Pos Uncertainty: 0.100000 nm (185м)
Manuever Distance: 36.913326 ft (11м)
Pilot Reaction Distance: 48.029102 ft (14м)
Curr Required Obs Clearance: 100.000003 ft (30м)
Вспомним алгоритм генерации алерта:
When the elevation of a terrain cell penetrates the floor of the alert envelope, an alert is generated. The algorithm examines cells beginning from the back of the envelope and proceeding forward. The back of the envelope extends behind the current aircraft position to account for position uncertainty.
EPU is used in the size of the envelope used for alerting. The envelope width is 1.8 times EPU and it extends 1.8 times EPU behind the current position. The forward extent of the envelope is 4 times EPU plus a look-ahead distance (groundspeed times 60, 90, or 120 seconds).
ROC is used as the basic vertical extent of the alert envelope during level flight and descent. During descent the maneuver distance and pilot reaction distance are added to ROC to expand the vertical envelope.
Определим размеры ALERT ENVELOPE.
Look-ahead distance будет равно 91м/с*60с+4*185м=6200м
Vertical extent будет равен 11м+14м+30м=55м
Back of envelope будет отстоять на 1.8*185м=333м назад от текущей позиции самолета.
Вопрос, который возникает при анализе этого события, иллюстрируется рисунком:
Почему точка конфликта события 34 не совпадает с точкой конфликта события 35?
Alert Record 34
Present Position Latitude: 54.826754 deg
Present Position Longitude: 32.125595 deg
Terr Conflict Latitude: 54.825680 deg
Terr Conflict Longitude: 32.099149 deg
Terr Conflict Elevation: 754.593200 ft
Airplane Altitude: 1080.053887 ft (329м)
Groundspeed: 177.750000 kts (91м/с)
Estimated Pos Uncertainty: 0.100000 nm (185м)
Manuever Distance: 36.913326 ft (11м)
Pilot Reaction Distance: 48.029102 ft (14м)
Curr Required Obs Clearance: 100.000003 ft (30м)
Вспомним алгоритм генерации алерта:
When the elevation of a terrain cell penetrates the floor of the alert envelope, an alert is generated. The algorithm examines cells beginning from the back of the envelope and proceeding forward. The back of the envelope extends behind the current aircraft position to account for position uncertainty.
EPU is used in the size of the envelope used for alerting. The envelope width is 1.8 times EPU and it extends 1.8 times EPU behind the current position. The forward extent of the envelope is 4 times EPU plus a look-ahead distance (groundspeed times 60, 90, or 120 seconds).
ROC is used as the basic vertical extent of the alert envelope during level flight and descent. During descent the maneuver distance and pilot reaction distance are added to ROC to expand the vertical envelope.
Определим размеры ALERT ENVELOPE.
Look-ahead distance будет равно 91м/с*60с+4*185м=6200м
Vertical extent будет равен 11м+14м+30м=55м
Back of envelope будет отстоять на 1.8*185м=333м назад от текущей позиции самолета.
Вопрос, который возникает при анализе этого события, иллюстрируется рисунком:
Почему точка конфликта события 34 не совпадает с точкой конфликта события 35?
