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Other limitations, 6 other limitations – PNI TCM 5 User Manual

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PNI Sensor Corporation

Doc #1007537 r12

TCM3 & TCM5 User Manual- Sept 2011

Page 28

4.2.6 Other Limitations

As discussed, the TCM

models local disturbances as a static magnetic vector contribution to the earth’s

field. Any local fields, which are not static, will create errors. You cannot calibrate for anomalies that are

not fixed with respect to the compass. For example, you may know that the TCM will be used in close

proximity to other vehicles. You cannot calibrate for the effects of these other vehicles, as they will be

moving with respect to the TCM. This is a limitation universal to all compasses. Consider, therefore, the

TCM

’s position relative to any potential sources of field that will not be static: magnetic cargo or payloads

that may be placed in close proximity, fans or other electrical equipment that may be turned on and off,

and so on.

The TCM can calibrate for any environment that creates a magnetic field that does not exceed the

dynamic range of its magnetometers.

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