Application

# Do you Know the Common Problems When Using an Electronic Compass?

Electronic compass  also be called digital compass, it was widely use in satellite antenna search star, artillery launch system, ROV underwater robot navigation, navigation navigation mapping, GPS integrated navigation, antenna servo control, infrared imager laser rangefinder, map filler, oceanology tester, special occasion robot, unmanned aerial vehicle….

Here I want to talk about the common problem you may faced during install the electronic compass.

1. How can the actual visual angle of the electronic compass be greater than the measured angle?

A: Since the two mutually perpendicular axes of the dip angle measurement are the most sensitive (X axis, Y axis), when the tilt direction and the measurement axis are uneven, the actual value will be greater than the measured value, which can also be understood as a projection.

2. How to understand the heading accuracy of the electronic compass?
A: Heading accuracy refers to root mean square error, not random error. In general, the heading accuracy is the value when the influence of the surrounding static magnetic field is compensated and the magnetic inclination is not greater than 75°.

3. Do you need to recalibrate the electronic compass when it is in use?
A: The electronic compass has been calibrated when it leaves the factory. No environmental calibration is required for use in areas where the magnetic environment is less affected. On the contrary, if the error is much greater than the nominal accuracy, user calibration is required.

4. Why does the electronic compass sometimes fail to achieve its nominal accuracy in practical use?

A: Especially when there is a pitch angle and a roll angle. Generally in the user calibration environment and the actual use of the environment is not the same, or the calibration effect did not achieve better results. If there is no tilt or roll when the electronic compass is rotated during calibration, but there is tilt and roll when it is actually used, then the calibration is ineffective or not effective.

5. What are hard and soft magnetic fields?

A: Hard magnetism is caused by the proximity of a constant-magnet or magnetic steel or iron to the sensor. This type of distortion makes the  distortion effect in all directions constant for a sensor with a relatively fixed position. The hard magnetic distortion superimposes a fixed magnetic field component on each axis of the sensor, so the hard magnetic distortion can be compensated with a simple algorithm.

6. How many ways are there to install the electronic compass?

A: according to the customer’s different use, we can provide customers with up to 24 kinds of installation methods.

7. What should be paid attention to in the installation of electronic compass?

A: Electronic compasses can compensate for magnetic interference, users should install and use them in an environment with minimal magnetic interference, away from iron, nickel, magnets, motors and other magnetic materials as much as possible. Should be installed in the physical environment is relatively stable position, the installation position should be isolated from the violent vibration, oscillation and jitter.