Introduction of electronic compass:
Introduction of electronic compass: Although GPS is widely used in navigation, positioning, speed measurement and orientation, its accuracy is greatly reduced or even unusable because its signal is often blocked by terrain and objects. Especially in urban areas with high-rise buildings and forest areas with dense vegetation, the effectiveness of GPS signals is only 60%. Moreover, at rest, GPS can't give course information. In order to make up for this deficiency, the method of integrated navigation and positioning can be adopted. Electronic compass products are designed to meet the needs of users. It can effectively compensate the GPS signal, ensure that the navigation and positioning information 100% is effective, and it can work normally even if the GPS signal is out of lock, so as to achieve "missing the star without losing direction".
Introduction of electronic compass function: Electronic compass can be divided into plane electronic compass and three-dimensional electronic compass. The plane electronic compass requires the user to keep the compass level when using it, otherwise, when the compass is tilted, it will also give the change of course, but in fact the course has not changed. Although the plane electronic compass has high requirements for use, it is a good cost-effective choice if the carrier attached to the compass can always remain horizontal. The three-dimensional electronic compass overcomes the strict restrictions on the use of the plane electronic compass, because there is an inclination sensor in the three-dimensional electronic compass. If the compass is inclined, it can compensate the inclination of the compass, so that even if the compass is inclined, the heading data is still accurate. Sometimes, in order to overcome the temperature drift, the compass can also build temperature compensation to minimize the temperature drift of tilt angle and pointing angle.
Working principle of electronic compass: The three-dimensional electronic compass consists of three-dimensional magnetoresistive sensor, two-axis tilt sensor and single chip microcomputer. The three-dimensional magnetoresistive sensor is used to measure the earth's magnetic field, and the inclination sensor is used to compensate when the magnetometer is not horizontal. Single-chip microcomputer processes the signals of magnetometer and inclination sensor, as well as data output and soft iron and hard iron compensation. The magnetometer adopts three vertical magnetoresistive sensors, and each sensor detects the geomagnetic field intensity in the axial direction. The sensor whose advancing direction is called X direction detects the geomagnetic field vector value in X direction; The sensor on the left or in the Y direction detects the vector value of the geomagnetic field in the Y direction; The downward or z-direction sensor detects the vector value of the geomagnetic field in the z direction. The sensitivity of the sensor in each direction has been adjusted to the optimal point according to the component vector of the geomagnetic field in this direction, and it has a very low horizontal axis sensitivity. The analog output signal generated by the sensor is amplified and sent to MCU for processing. The measuring range of magnetic field is 2 gauss. By using the 12-bit A/D converter, the magnetometer can distinguish the magnetic field variation less than 1 gauss, and we can accurately measure the magnetic field intensity in the X and Y directions of 200-300 gauss through this high resolution, whether it is the upward variation on the equator or the low value position of the north and south poles.
Application neighborhood of electronic compass: horizontal and vertical hole measurement, underwater exploration, aircraft navigation, scientific research, education and training, building positioning, equipment maintenance, navigation system, simulation system, GPS backup, car compass, virtual reality.