Magnetic electron compass for vehicle with accelerating and decelerating compensating function and measurement method thereof

Abstract

The invention discloses a vehicle magnetic electron compass capable of compensating for acceleration and deceleration and a measuring method thereof, and relates to the technique of measuring the direction of a running vehicle. The measuring method is as follows: signals of a geomagnetic field vector measured by a triaxial geomagnetic sensor, a vehicle accelerated speed measured by a triaxial acceleration transducer, and a vehicle running speed measured by a magnetic encoderare sent to a microprocessor after certain treatment, and then the microprocessor calculates a geomagnetic azimuth and obtains direction data relative to true north by adding the geomagnetic azimuth and magnetic declination data stored in a memory obtains. The invention introduces the magnetic encoder with high resolution to measure the vehicle running speed, and obtains the vehicle running accelerated speed after calculation, thus the vehicle running accelerated speed can be combined with the vehicle accelerated speed information measured by the triaxial acceleration transducer to separate static accelerated speed information from dynamic accelerated speed information, so as to accurately acquire vehicle lateral attitude information. The acquired vehicle lateral attitude information is utilized to calculate geomagnetic field horizontal component and further calculate the geomagnetic azimuth, so that the measurement has high accuracy.

Description

technical field [0001] The invention relates to a technology for measuring the direction of a traveling vehicle, in particular to a device for realizing the direction measurement of a traveling vehicle by utilizing the geomagnetic field. Background technique [0002] Vehicle drivers have such feelings, no matter in the city or in the countryside, it is very difficult to judge the direction. Usually rely on road signs and the position of the sun to judge the direction. But in cloudy and rainy days and at night, under the situation that there is no road sign instruction again, often go wrong way because of unclear direction. Therefore, it is very necessary to install a device with direction indicating function on the vehicle. [0003] In recent years, GPS has brought great convenience to people in terms of navigation, positioning, and orientation. However, GPS cannot locate accurately in some geographical environments (for example, when it is blocked by tall buildings, moun...

AI Technical Summary

Problems solved by technology

The invention patent compensates for the inclination of the rearview mirror assembly by monitoring the output signal of the third-axis geomagnetic sensor, but does not consider the inclination of the vehicle. In fact, the vehicle is driving, especially when driving in mountainous areas. Often encounter the situation of uphill and downhill, that is, the situation of pitching and tilting

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