UTC
Coordinated Universal Time (UTC) is the global time standard used in inertial navigation systems (INS) to synchronize data with GNSS, sensors, and external systems. UTC provides a precise, uniform time reference essential for accurate positioning, velocity calculations, and system coordination. Why is UTC Important in Inertial Navigation? Time Synchronization – Ensures IMU, GNSS, and external […]
Coordinate
In inertial navigation, the term constellation refers to the network of satellites used for positioning, navigation, and timing (PNT) when an INS (Inertial Navigation System) is integrated with GNSS (Global Navigation Satellite System). A satellite constellation consists of multiple satellites working together to provide global coverage and accurate location data. Major GNSS Constellations Used in […]
Constellation
In inertial navigation, the term constellation refers to the network of satellites used for positioning, navigation, and timing (PNT) when an INS (Inertial Navigation System) is integrated with GNSS (Global Navigation Satellite System). A satellite constellation consists of multiple satellites working together to provide global coverage and accurate location data. Major GNSS Constellations Used in […]
Compass
In inertial navigation, a compass refers to a device used to determine direction relative to the Earth’s magnetic field. It is often integrated with an Inertial Navigation System (INS) to provide heading information, which helps correct drift errors in long-duration navigation. Types of Compasses in Inertial Navigation Magnetic Compass – Measures Earth’s magnetic field to […]
Communications Protocol
A communications protocol in inertial navigation refers to the standardized rules and formats used for transmitting data between an Inertial Navigation System (INS) and other systems, such as GNSS receivers, flight control systems, autonomous vehicles, or mission computers. These protocols ensure accurate, reliable, and efficient data exchange for navigation, positioning, and sensor fusion. Why is […]
Checksum
A checksum in inertial navigation is a data integrity verification method used to detect errors in transmitted or stored data. It is a mathematical value calculated from a data set (such as a navigation message from an IMU, INS, or GNSS receiver) and transmitted along with the data. The receiver or processing unit recalculates the […]
Carrier Phase Ambiguity
Carrier Phase Ambiguity refers to the unknown integer number of full wavelength cycles in the carrier phase measurement of a GNSS signal. This concept is crucial in high-precision GNSS-aided inertial navigation systems (INS/GNSS integration). Since GNSS signals are transmitted as electromagnetic waves, a receiver measures the phase of the signal’s carrier wave to determine distance. […]
Carrier
In inertial navigation, the term carrier generally refers to the moving platform or vehicle on which the inertial navigation system (INS) is mounted. This can include aircraft, ships, submarines, ground vehicles, missiles, or even space vehicles. The INS measures the motion of the carrier using accelerometers and gyroscopes, tracking its position, velocity, and orientation over […]
C/A Code
The C/A Code (Coarse/Acquisition Code) in inertial navigation is a key component of GPS signals, primarily used in the L1 frequency band (1575.42 MHz). It is a pseudo-random noise (PRN) code that enables GPS receivers to determine distance (pseudorange) to satellites, facilitating position, velocity, and timing calculations. While inertial navigation systems (INS) operate independently of […]
BVLOS
BVLOS stands for Beyond Visual Line of Sight, and it refers to a type of operation for unmanned aerial vehicles (UAVs) or drones where the operator does not need to maintain direct visual contact with the drone during flight. In BVLOS operations, the drone flies beyond the operator’s visual range, which may be several kilometers […]
