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Everything you want to know about inertial navigation system GPS tracker
Jimi loTJimi loT2020-05-07

What is inertial navigation system (INS) ?

INS (Inertial Navigation System) is an autonomous navigation system that uses inertial sensitive devices, reference directions, and initial position information to determine the position, direction, and speed of moving objects in inertial space.

Inertial Navigation System (INS) VS Embedded GPS Inertial Navigation System (EGI)

The embedded configuration does not require an additional safety bus between the inertial navigation and a separate GPS receiver, so that the GPS pseudo-range and pseudo-range rate data will not be interfered with by threat signals. This deep coupling system of INS and GPS is called "embedded GPS inertial navigation system", referred to as EGI for short.

Inertial Navigation System VS GPS

The INS is a system that measures the position of the objects. It is based on the interaction between accelerometer and gyroscope to obtain the reference coordinate system, and then to conduct positioning. INS is a completely autonomous navigation system that does not send/receive signals to/from the outside, and can accurately locate the position of the objects.

Features:

High accuracy;

It can measure the target position of the high mobility objects without external interference.

GPS positioning is a navigation system that uses satellites to perform real-time positioning on a global scale. It mainly collects and locates information through satellite ephemeris, relative distance, atmospheric correction and other data, so as to calculate the accurate position.

Features:

Ability to work globally and around the clock;

Multiple functions and wide application;

High efficiency and simple operation.

How accurate is inertial navigation?

GPS uses P code reception, and the positioning accuracy can reach about 10m. The accuracy of INS can reach the centimeter level. Applied signal processing algorithms and combined with GPS/INS, it will be able to make up for the shortcomings of insufficient accuracy of the most hardware.

INS and GPS integration

INS / GPS integrated navigation system refers to the integrated navigation system based on GPS satellite navigation system and inertial navigation system. It makes full use of the advantages of both navigation systems, based on the optimal estimation calculation-Kalman filter algorithm fuse the two navigation algorithms to obtain the optimal navigation results; especially when the satellite navigation system has no signals, the inertial navigation system could work, ensuring the normal operation of the navigation system, and improving the stability and reliability.

GPS / INS combination - enhances the anti-interference ability of the system

When the GPS signal reception has severely interfered or the receiver has a problem, the INS system will independently complete the positioning and navigation work. In other words, when the navigation equipment you use is in a weak place such as a tunnel, you can continue to complete positioning navigation through the INS system without interruption. When the GPS signal is received normally, the INS will provide the GPS receiver with position, speed and other information, which is convenient for the navigation device to re-acquire the carrier and GPS code.

GPS / INS combination- improves system accuracy

The accuracy of GPS is high, so this high-precision information can be used to correct the INS and reduce the accumulation of errors over time. On the other hand, INS is prior to high positioning accuracy and high data sampling rate in a short time, which can provide auxiliary information for GPS. This greatly improves the ability of the system to recapture satellite signals.

GPS/INS is a system in which GPS and INS complement each other. It is not a simple combination. The integrated system has better positioning and navigation performance as well as a wider application range.

INS GPS tracker

When we drive in the city, we often pass high-rise buildings, underground tunnels, and viaduct. The barriers of the buildings will affect the GPS signal reception and form the so-called "urban canyon." JM-VG01U GPS and INS tracker provide precise navigation in areas with limited satellite coverage. The device also incorporates GPS for car navigation. This means that even in areas where GPS signals are weak or even lost, the driver will not get lost.

JM-VG01U is a tracker with advanced adaptive integrated navigation algorithm and GNSS positioning, which can provide real-time high-precision vehicle positioning in any environment (such as tunnels, underground garages, etc.), speed and attitude information. When the signal of the GNSS system is poor or even lost,  JM-VG01U can use inertial navigation technology to independently perform high-precision positioning, speed and attitude measurement on the vehicle. With a built-in multi-positioning module, JM-VG01U supports the simultaneous reception of GPS, GLONASS, Galileo and Beidou. Compared with a single GPS system, the JM-VG01U greatly increases the number of visible and available satellites, while reduces the first positioning time. In addition, even driving in complex urban environments can achieve higher positioning accuracy.

Each positioning technology has its own characteristics, while the application range of inertial navigation will be wider, and the cost will be relatively lower. For the characteristics of inertial navigation that will generate cumulative errors, we can adopt a multi-source data fusion and multi-dimensional intelligent learning scheme to obtain all identifiable signals for correcting the inertial navigation offset, and automatically correct the deviation through map data. For a long period of time in the future, inertial navigation positioning will be the core technology in positioning solutions. If you want to know more about JM-VG01U inertial navigation system GPS tracker, please contacts us.

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