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Difference between indoor location with GPS and compass micro inertial navigation technology
- Nov 30, 2016 -

File navigation, we think of GPS, China also launched its own satellite navigation system-Beidou satellite positioning system. But GPS can only be used in an outdoor environment, indoors, due to the fast navigation signal attenuation, satellite positioning is not available.

So did indoor positioning the current "need"? The answer is Yes. Today we are not talking about now very lively consumer market applications, we are talking about indoor positioning technology in some special but important – fire and rescue, counter-terrorism in a sudden, disaster relief and other emergency tasks.

Imagine this scenario: a fire, firefighters rushed into the burning building to try to rescue survivors, the fire more and more violent, smoke, firefighters lost exports could not be found, oxygen is not enough, finally lost their lives ... ...

If you can pinpoint locations that firefighters, administrative command personnel to enter the fire rescue firefighters in real time, through a communications device to provide field personnel with accurate command, avoiding firefighters lost in the fire, you can minimize casualties. This indoor positioning technology, merit one.

Currently industry mainstream indoor positioning technology general need external facilities or prior database, like UWB, and WiFi, and Bluetooth, and geomagnetic,, and fire rescue, emergency task usually too late or environment not allows layout external positioning base station or letter standard, equipment, so no a can meet emergency task Xia independent positioning of requirements, so used not rely on any external equipment or prior database of used guide positioning technology is currently compared sound of means. Inertial positioning is a completely autonomous navigation technology, is distinct from regular positioning techniques, it does not rely on satellite navigation, wireless base stations, any ancillary equipment such as electronic tags and prior databases.

Pure inertial navigation positioning in indoor scenes, after after a long walk, drift angle and position are not obvious, so in many usage scenarios, and no other auxiliary position means. But this pure inertial positioning products are still has two weaknesses:

Is output as a relative path, need to track multiple people into a coordinate system, more practices currently in use are all emergency staff when they started passing the same long line will rotate the path to a unified coordinate at the application layer. Second approach is probably the deployment of two feet (more than at least 10 m apart), all the players followed by steps on two feet, you can automatically rotate multiple players into one coordinate.

Second, pure inertial navigation position accuracy, industry 0.3% accuracy is relatively high at present, but in the big picture long cases, due to inherent to the ins drift rates, there will be a large accumulated error, calibration requires external information.

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