GNSS
GNSS stands for Global Navigation Satellite System. It refers to a network of satellites that work together to provide geospatial positioning information, which allows users to determine their exact location on Earth (latitude, longitude, and altitude). GNSS is commonly used in applications like GPS, navigation systems, mapping, and surveying. Some of the most well-known GNSS […]
GLONASS
GLONASS is a global satellite navigation system developed, constructed, and managed by Russia. It provides global users with real-time three-dimensional positioning, velocity, and time information, including services such as Standard Accuracy Channels (CSA) and High Accuracy Channels (CHA).
Geodetic coordinate system
The geodetic coordinate system is a terrestrial coordinate system where the origin is at the center of the reference ellipsoid, the prime meridian and the equatorial plane serve as the reference planes, and the normal to the ellipsoid at a given point is the reference axis. The spatial position of a point is commonly described […]
GBAS
GBAS (Ground-Based Augmentation System) is a system designed to improve the accuracy, integrity, and reliability of GNSS signals, particularly for aviation applications. It provides real-time corrections to GNSS data (such as GPS) to enhance the precision of navigation and position determination. GBAS works by using a network of ground-based reference stations that receive GNSS signals, […]
GALILEO
Galileo is a global satellite navigation system developed, constructed, and managed by the European Union. It provides global users with real-time three-dimensional positioning, velocity, and time information, including services such as open, commercial, safety-of-life, public regulated, and search and rescue support.
Factors Affecting Inertial Navigation Accuracy and Optimization Directions
Factors Affecting Accuracy: Sensor Errors: Accelerometer errors (such as bias, scale factor errors, noise, etc.) and gyroscope errors (such as bias drift, noise, scale factor errors, etc.) are key determinants of the accuracy of inertial navigation systems. Over time, sensor errors accumulate, which impacts the accuracy of position and attitude estimation. System Integration Errors: The […]
Enroute
Enroute refers to the airspace designated for aircraft flight, with specified altitude and lateral boundaries, where ground-based or space-based navigation facilities are provided and navigation requirements are imposed on aircraft.
Effective speed
Effective speed refers to the velocity component along the correct flight path.
Drif
In the context of inertial navigation systems (INS), drift refers to the gradual accumulation of error over time, which causes the system’s measurements (like position, velocity, or heading) to gradually become less accurate. Here’s how it works: No external correction: In INS, sensors like accelerometers and gyroscopes are used to calculate things like position and […]
DR
Dead Reckoning is a traditional method of navigation where the position of an aircraft (or any vehicle) is determined by calculating its course, speed, time, and direction from a known position, without relying on external references like landmarks or GPS. It involves using instruments such as a compass, an airspeed indicator, and a clock to […]
