GBAS-ABAS-SBAS Augmented GPS or Differential GPS Augmented or Differential GPS improves the accuracy of GPS to the level of precision approach aid as well as warns in case of GPS failure Differential GPS could be GBAS, ABAS or SBAS based on the technology employed for augmentation Ground Based Augmentation System (GBAS) or Local Area Augmentation System (LAAS) Air Based Augmentation System (ABAS) using Receiver Autonomous Integrity Monitoring (RAIM) Satellite Based Augmentation System (SBAS) or Wide Area Augmentation System (WAAS) Ground Based Augmentation System (GBAS) Ground Based Augmentation System (GBAS) provides…
Global Positioning System (GNSS-GPS)
Global Navigation Satellite System Global Navigation Satellite System (GNSS) Global Positioning System (GPS) is the most commonly used Global Navigation Satellite System (GNSS) in Civil Aviation GPS provides Standard Position Service of 30M for all users and Precision Position Service with an accuracy of 1M for US Military Forces Russian GLONASS, European GALILEO, Chinese BEIDOU and Indian INSAT are other operational GNSS systems Satellites called as Space Vehicles used in GNSS follow Kepler’s laws of planetary motion GPS Position Reference System is referenced to centre of earth in three dimensions…
Radio Altimeter (Radalt)
Radio Altimeter Radio Altimeter Radio Altimeter provides accurate height of aircraft above ground level using Frequency Modulated Continuous Wave (FMCW) transmission In addition to providing height when aircraft is between 50 – 2500 Feet AGL, it also provides height information to Auto Land system and GPWS Since the minimum pulse width possible by pulse radar is half micro second, pulse radars are unsuitable for height measurement less than 250 feet Therefore, Frequency Modulated Continuous Wave on SHF band on 4200-4400 MHz frequencies Radio Altimeter accuracy is the higher of 3%…