Micro azimuth-level detector based on micro electro-mechanical systems and a method for determination of attitude
First Claim
1. A Micro Electro-mechanical System (MEMS) based micro azimuth-level detector comprising multi-sensors, an analog/digital (A/D) converter, a microprocessor for signal processing, an RS-232 electrical interface, and a PC having an Operation-Display software, wherein the multi-sensors comprise three accelerometers and three magnetometers, the three accelerometers are assembled along three orthogonal axes and having a processing circuit, and the three magnetometers are assembled along three orthogonal axes and have a processing circuit, and wherein analogue signals from the multi-sensors are converted into digital signals by the A/D converter, sent to and processed in the microprocessor, and further transmitted via RS-232 to be shown in the PC.
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Abstract
This present invention is subjected to the field of instrument & measurement technology based on Micro Electro-mechanical Systems (MEMS). A micro azimuth-level detector comprises multi-sensors (triaxial silicon accelerometers with the processing circuit and triaxial silicon magnetometers with the processing circuit), A/D converter for converting the analog signals of the sensors to the digital signals, microprocessor in which the signal-processing and attitude computation are carried out, RS-232 for connecting the microprocessor with PC, and Operation-Display interface. An attitude computation method uses the Orientation Cosine Conversion of the earth'"'"'s gravity and magnetic field.
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Citations
6 Claims
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1. A Micro Electro-mechanical System (MEMS) based micro azimuth-level detector comprising
multi-sensors, an analog/digital (A/D) converter, a microprocessor for signal processing, an RS-232 electrical interface, and a PC having an Operation-Display software, wherein the multi-sensors comprise three accelerometers and three magnetometers, the three accelerometers are assembled along three orthogonal axes and having a processing circuit, and the three magnetometers are assembled along three orthogonal axes and have a processing circuit, and wherein analogue signals from the multi-sensors are converted into digital signals by the A/D converter, sent to and processed in the microprocessor, and further transmitted via RS-232 to be shown in the PC.
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4. A method for determining attitude comprising
obtaining electrical/analog signals from sensors, converting the electrical/analog signals into digital signals by an A/D converter, filtering the digital signals and processing the digital signals by electric/physical conversion, eliminating misalignment in the processed digital signals by misalignment compensation based on optical alignment, computing attitude angles including pitch, roll and heading from the processed signals by Orientation Cosine Conversion of the earth'"'"'s gravity and magnetic field and inverse tangent method, conditionally smooth-processing the computed attitude angles by applying a large amount of smoothing to small variations and little or no smoothing for large change in attitude outputs, displaying the conditionally smooth-processed attitude on an Operation-Display interface.
Specification