LQE
LQE (Linear Quadratic Estimator) is an optimal state estimation algorithm used in inertial navigation systems (INS) to reduce errors and improve accuracy. It is similar to the Kalman filter but focuses on minimizing estimation error variance while balancing system stability and performance. How LQE Works in INS? Sensor Data Input – IMU (gyroscope & accelerometer) […]
Lidar / LiDAR
LiDAR (Light Detection and Ranging) is a remote sensing technology that uses laser pulses to measure distances and create high-resolution 3D maps. In inertial navigation (INS), LiDAR is used for terrain mapping, obstacle detection, and localization, especially in autonomous vehicles, drones, and defense applications. How LiDAR Works in INS? Laser Pulse Emission – A LiDAR […]
Kinematics
In inertial navigation (INS), kinematics refers to the study of motion (position, velocity, and acceleration) without considering forces. INS uses kinematic equations to track an object’s movement based on measurements from gyroscopes and accelerometers, making it essential for aircraft, submarines, missiles, and autonomous systems. How Kinematics is Used in INS? Position Calculation – INS integrates […]
Ionospheric Delay
Ionospheric delay is a signal propagation delay that occurs when GNSS signals pass through the Earth’s ionosphere, a layer of charged particles in the atmosphere. This effect introduces positioning errors in GNSS-aided Inertial Navigation Systems (INS) by causing signal refraction and travel time variations, affecting high-precision navigation in aerospace, military, and maritime applications. How Ionospheric […]
Inverted USBL
Inverted USBL (Ultra-Short Baseline) is an underwater acoustic positioning system used in inertial navigation to determine the position of a surface or aerial vehicle relative to an underwater object. It is the reverse of traditional USBL, where the transceiver is placed underwater and tracks an acoustic beacon on a surface vessel, autonomous underwater vehicle (AUV), […]
Interferometry
Interferometry in inertial navigation refers to the use of wave interference principles (typically light or radio waves) to measure precise motion, orientation, and distance. It is commonly applied in high-precision gyroscopes, such as Fiber Optic Gyroscopes (FOG) and Ring Laser Gyroscopes (RLG), which are essential for aerospace, defense, and submarine navigation. How Interferometry Works in […]
Initial Bias
In inertial navigation (INS), initial bias refers to the constant sensor error present at the start of operation, particularly in gyroscopes and accelerometers. This bias can cause navigation drift, affecting position, velocity, and orientation accuracy over time. Sources of Initial Bias in INS Gyroscope Bias – Small errors in measuring angular velocity lead to incorrect […]
IMU
An IMU (Inertial Measurement Unit) is a sensor module used in Inertial Navigation Systems (INS) to measure an object’s motion, orientation, and acceleration. It consists of gyroscopes, accelerometers, and sometimes magnetometers, making it a key component for GNSS-aided and standalone navigation in aerospace, defense, autonomous vehicles, and robotics. How an IMU Works in INS? Gyroscopes […]
IMO
In inertial navigation (INS), IMO (International Maritime Organization) is the United Nations agency responsible for setting global maritime safety, navigation, and environmental standards. For marine INS applications, IMO regulations define the required accuracy, reliability, and integration of navigation systems used in commercial ships, submarines, and naval vessels. How IMO Regulations Impact Inertial Navigation? IMO Performance […]
HAPS
HAPS (High-Altitude Pseudo-Satellite) refers to unmanned aerial platforms operating in the stratosphere (above 18 km or 60,000 feet) that provide persistent surveillance, communications, and navigation support. In inertial navigation (INS), HAPS can serve as a GNSS alternative or augmentation, improving navigation accuracy in GNSS-denied environments. How HAPS Supports Inertial Navigation? GNSS Augmentation – HAPS can […]
