Electronic compass

Today, there exist several types of technology for the electronic compasses : Fluxgate, magneto-resistive, magneto-inductive, etc

Fluxgate

The most common type for the systems of Navigation is the fluxgate. The fluxgate consists of a set of reels rolled up around a bar Ferromagnétique. Associated with a feed circuit this detector is able to measure magnetic fields lower than 1 milligauss. The fluxgate makes it possible to have a measurement of the Terrestrial magnetic field for low costs but it tends to be bulky, somewhat fragile and has a relatively long response time. This response time can be 2 to 3 seconds what is not acceptable on systems of fast displacement.

Magneto-resistive

Another type is the Magneto-resistive sensor (MR.). This detector is composed of fine layers of Permalloy whose electrical resistance varies with a variation of the magnetic field applied. This sensor which is sensitive only along one axis can be placed in an integrated circuit. Last progress on these detectors made it possible to obtain sensitivities lower than 0,1 milligauss with a response time lower than the microsecond, the whole in a circuit CMS thus of very reduced size. These components can thus make up to 1000 measurements a second in moving traffic.

Magneto-inductive

August 1st

Various types of measurement

There are several types of compasses used for the navigation systems. There exists inter alia the compass giving the intercardinaux cardinal points and the four points and the compass giving a measurement except for the degree.

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