Inertia/geomagnetism integrated navigation system low-noise measurement circuit based on three-axis TMR sensor

Abstract

The invention relates to the technical field of navigation equipment circuits, in particular to an inertia / terrestrial magnetism integrated navigation system low noise measuring circuit based on a three-axis TMR sensor. The inertia / terrestrial magnetism integrated navigation system low noise measuring circuit based on the three-axis TMR sensor comprises a power supply module, a signal processing module and an information acquisition module, and the power supply module comprises a + 2.5 V output power supply circuit, a + 3.3 V output voltage power supply circuit and a + 5V buffer voltage powersupply circuit; the information acquisition module comprises a three-axis tunneling magnetoresistive magnetic sensor circuit and an inertial sensor measurement circuit; the signal processing module comprises an X-axis signal processing circuit, a Y-axis signal processing circuit, a Z-axis signal processing circuit and an AD conversion circuit; according to the invention, an underwater vehicle witha certain volume can continuously work underwater for a longer time, and the problem that the noise of a signal is not thoroughly filtered at a high frequency due to lower frequency of a measurementmagnetic field is solved.

Description

technical field [0001] The invention relates to the technical field of navigation equipment circuits, in particular to a low-noise measurement circuit for an inertial / geomagnetic integrated navigation system based on a three-axis TMR sensor. Background technique [0002] Navigation and positioning technology is in a basic position in the development of modern science and technology, permeating various military and civilian fields, and showing an increasingly important role; with the continuous improvement of navigation requirements, a single navigation system can no longer meet today's Navigation needs, so the integrated navigation system is increasingly highlighting its technical advantages. Common integrated navigation systems include inertial / GPS / geomagnetic navigation methods. [0003] Since the GPS signal propagates and attenuates quickly in water, when the unmanned submersible is operating underwater, the inertial / GPS integrated navigation system will often lose the lo...

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Problems solved by technology

[0010] At present, there are few designs of inertial / geomagnetic integrated navigation detection circuits based on TMR sensors, and the research direction is wide. Research can be done on simplifying circuits, reducing power consumption, compressing space size, and reducing design costs; in order to make a certain volume of underwater The submersible can continue to work underwater for a longer period of time, and solve the problem of incomplete noise filtering at high frequencies of the signal due to the low frequency of the measured magnetic field; therefore, this invention proposes a low-power and low-noise three-axis TMR The detection circuit of the inertial / geomagnetic integrated navigation system of the sensor

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