Geomagnetic sensor low noise signal processing circuit used for rotating body
A signal processing circuit and a geomagnetic sensor technology, applied in the sensor field, can solve the problems of the geomagnetic sensor being easily affected by the external magnetic field environment, low measurement accuracy, etc., and achieve the effects of improving the geomagnetic measurement accuracy and increasing the adjustable range of the amplitude.
Inactive Publication Date: 2018-11-23
CHONGQING GOD ARROW INERTIAL TECH
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[0003] The invention provides a low-noise signal processing circuit for a geomagnetic sensor for a rotating body to solve the problem that the current geomagnetic sensor is easily affected by the external magnetic field environment and has low measurement accuracy
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[0028] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.
[0029] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.
[0030] see figure 1, is a c...
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The invention provides a geomagnetic sensor low noise signal processing circuit used for a rotating body. The circuit comprises a microprocessor, a setting reset circuit, a geomagnetic sensor, a preamplifier circuit and a signal conditioning circuit which are successively connected. The microprocessor carries out setting reset on the geomagnetic sensor according to a corresponding period through the setting reset circuit so that the geomagnetic sensor outputs the sensing signal of the corresponding period. The preamplifier circuit carries out pre-amplification processing on the sensing signal.The signal conditioning circuit adjusts the amplification times of the pre-amplified sensing signal and a signal-to-noise ratio, and conditions the pre-amplified sensing signal based on the adjustedamplification times and the signal-to-noise ratio so that the conditioned sensing signal matches with the analog input signal range of a backward-stage analog-digital converter. In the invention, theinfluence of an extraneous magnetic field environment on the geomagnetic sensor can be reduced, and the measured precision of the geomagnetic sensor is increased.
Description
technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a low-noise signal processing circuit of a geomagnetic sensor for a rotating body. Background technique [0002] With the rapid development of the economy, the investment in road construction is increasing. However, due to the generally long cycle of road construction, its expansion is far behind the rapid increase of vehicles, which makes the traffic situation worse. In order to change this situation, it is necessary to establish a complete traffic monitoring system. The establishment of a traffic monitoring system bears the brunt of data collection, and the geomagnetic sensor is a key part of data collection. The performance of the geomagnetic sensor plays a decisive role in the accuracy of data collection. However, when current geomagnetic sensors measure magnetic signals, they are easily disturbed by the external magnetic field environment, and the measurement acc...
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Login to View More IPC IPC(8): G01V3/40G01V3/38
CPCG01V3/38G01V3/40
Inventor 王乾发张洪宇黄绍锦谭本亮
Owner CHONGQING GOD ARROW INERTIAL TECH