CN212274945U - Inertia measuring unit - Google Patents
Inertia measuring unit Download PDFInfo
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- CN212274945U CN212274945U CN201922498855.2U CN201922498855U CN212274945U CN 212274945 U CN212274945 U CN 212274945U CN 201922498855 U CN201922498855 U CN 201922498855U CN 212274945 U CN212274945 U CN 212274945U
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Abstract
The utility model relates to an inertia measurement unit, include: the device comprises a shell, an inertia measurement unit mounting bracket, three optical fiber angular rate gyro sensors, three quartz flexible accelerometers, a signal processing board and a power board; the three optical fiber angular rate gyro sensors, the three quartz flexible accelerometers, the signal processing board and the power board are fixedly arranged on the bracket; the signal processing board comprises a signal generator, a current-voltage conversion circuit, an AD conversion circuit, an I/F conversion circuit, an RS422 interface and a CAN interface; the current-voltage conversion circuit is connected with the optical fiber angular rate gyro sensor, the I/F conversion circuit is connected with the quartz flexible accelerometer, the AD conversion circuit is connected with the current-voltage conversion circuit and the I/F conversion circuit, and the RS422 interface and the CAN interface are connected with the AD conversion circuit. The utility model discloses the device combines to design one set of precision height, low power dissipation, small inertial measurement unit through optic fibre gyro sensor, quartzy flexible accelerometer.
Description
Technical Field
The utility model belongs to the technical field of inertial sensor, especially an inertia measurement unit.
Background
With the development and progress of the inertial sensor, the application of the inertial measurement technology in the fields of navigation guidance, automatic control and the like is more extensive. The existing inertial sensor comprises an inertial measurement unit adopting an MEMS scheme and a traditional fiber-optic gyroscope scheme, and the scheme has the problem that the precision and the volume power consumption cannot be considered at the same time. The utility model provides an inertia measurement unit that comprises triaxial fiber angular rate top and the quartzy flexible accelerometer of triaxial.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an inertia measuring unit.
The utility model provides a technical scheme of above-mentioned problem does: an inertial measurement unit comprising: the device comprises a shell, an inertia measurement unit mounting bracket, three optical fiber angular rate gyro sensors, three quartz flexible accelerometers, a signal processing board and a power board;
the three optical fiber angular rate gyro sensors, the three quartz flexible accelerometers, the signal processing board and the power board are fixedly arranged on the inertial measurement unit mounting bracket;
the signal processing board comprises a signal generator, a current-voltage conversion circuit, an AD conversion circuit, an I/F conversion circuit, an RS422 interface and a CAN interface which are arranged on the circuit board;
the signal generator is used for generating an excitation signal of the optical fiber angular rate gyro sensor, the current-voltage conversion circuit is connected with the optical fiber angular rate gyro sensor, the I/F conversion circuit is connected with the three quartz flexible accelerometers, the AD conversion circuit is connected with the current-voltage conversion circuit and the I/F conversion circuit, and the RS422 interface and the CAN interface are connected with the AD conversion circuit;
the power panel is used for providing power for the three optical fiber angular rate gyro sensors, the three quartz flexible accelerometers and the signal processing board.
According to the scheme, in the signal processing board, the signal generator is used for generating an excitation signal of the fiber angular rate gyro sensor; the current-voltage conversion circuit is connected with the optical fiber angular rate gyro sensor and converts a signal output by the optical fiber angular rate gyro sensor into a voltage signal; the I/F conversion circuit is connected with the three quartz flexible accelerometers and converts current signals output by the three quartz flexible accelerometers into frequency signals; the AD conversion circuit is connected with the current-voltage conversion circuit and the I/F conversion circuit, and the RS422 interface and the CAN interface are connected with the AD conversion circuit.
According to the scheme, the signal generator comprises an excitation current source for generating a current signal and a sensitive light path for receiving the excitation current source signal.
According to the scheme, the mounting bracket of the inertia measurement unit is a polygonal three-dimensional bracket.
According to the scheme, the mounting bracket of the inertia measurement unit is a polygonal three-dimensional bracket comprising four rectangular side surfaces and four arc-shaped connecting surfaces connected with the rectangular side surfaces.
According to the scheme, the signal processing board is arranged on the upper end face of the mounting support of the inertial measurement unit, and the quartz flexible accelerometer is arranged on the bottom plate of the mounting support of the inertial measurement unit.
According to the scheme, the three optical fiber angular rate gyro sensors are respectively arranged on 2 side surfaces of the installation support of the inertial measurement unit and the upper surface of the bottom plate.
According to the scheme, a filter circuit is further arranged between the RS422 interface, the CAN interface and the AD conversion circuit.
The working principle of the device is as follows: three optical fiber angular rate gyroscopic sensors and three quartz flexible accelerometers are orthogonally arranged on an inertial measurement unit mounting bracket according to three axes of an X axis, a Y axis and a Z axis, signals output by the three optical fiber gyroscopic sensors are converted into voltage signals through related conditioning circuits, signals output by the three quartz flexible accelerometers are current signals, the current signals are converted into frequency signals through a high-precision I/F conversion circuit, and the voltage signals and the frequency signals are collected by a signal processing board and are output through an RS422 interface and a CAN interface after being filtered.
The utility model discloses the beneficial effect that the device brought is: the utility model discloses the device combines to design the inertial measurement unit of one set of high accuracy, low-power consumption, small through fiber optic gyro sensor, quartzy flexible accelerometer and signal processing board.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
in the figure: the system comprises a 1-aluminum alloy shell, a 2-signal processing board, a 3-aluminum alloy support, a 4-fiber optic gyroscope sensor, a 5-power panel and a 6-quartz flexible accelerometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, an inertial measurement unit includes three high-precision fiber-optic gyroscope sensors 4, three high-precision quartz flexible accelerometers 6, a signal processing board 2, a power board 5, an aluminum alloy housing 1 and a bracket 3, wherein the fiber-optic gyroscope sensors, the quartz flexible accelerometers, the signal processing board and the power board are all mounted on the aluminum alloy bracket. The optical fiber gyro sensor and the quartz flexible accelerometer are connected with the signal processing board and the power board through wires.
The inertial measurement unit mounting bracket is a polygonal three-dimensional bracket comprising four rectangular side surfaces and four arc-shaped connecting surfaces connected with the rectangular side surfaces, and the three optical fiber angular rate gyro sensors and the three quartz flexible accelerometers are orthogonally arranged on the inertial measurement unit mounting bracket according to three axes of an X axis, a Y axis and a Z axis;
the signal processing board comprises a signal generator, a current-voltage conversion circuit, an AD conversion circuit, an I/F conversion circuit, an RS422 interface and a CAN interface which are arranged on the circuit board;
in the signal processing board, a signal generator is used for generating an excitation signal of the fiber optic angular rate gyro sensor, and the signal generator comprises an excitation current source for generating a current signal and a sensitive optical path for receiving the excitation current source signal; the current-voltage conversion circuit is connected with the optical fiber angular rate gyro sensor and converts a signal output by the optical fiber angular rate gyro sensor into a voltage signal; the I/F conversion circuit is connected with the three quartz flexible accelerometers and converts current signals output by the three quartz flexible accelerometers into frequency signals; the AD conversion circuit is connected with the current-voltage conversion circuit and the I/F conversion circuit, the RS422 interface and the CAN interface are connected with the AD conversion circuit, and a filter circuit is further arranged between the RS422 interface and the AD conversion circuit and between the CAN interface and the AD conversion circuit.
The power supply board converts external 24V power supply voltage into +5V, +/-12V and other voltages to supply power for the signal processing board, the fiber-optic gyroscope and the accelerometer.
The utility model discloses the device has realized the inertial measurement unit of high accuracy under limited volume. The inertial measurement unit has higher precision compared with the MEMS scheme. Compared with the traditional fiber-optic gyroscope scheme, the fiber-optic gyroscope has smaller volume and power consumption.
Claims (8)
1. An inertial measurement unit, comprising: the device comprises a shell, an inertia measurement unit mounting bracket, three optical fiber angular rate gyro sensors, three quartz flexible accelerometers, a signal processing board and a power board;
the three optical fiber angular rate gyro sensors, the three quartz flexible accelerometers, the signal processing board and the power board are fixedly arranged on the inertial measurement unit mounting bracket;
the signal processing board comprises a signal generator, a current-voltage conversion circuit, an AD conversion circuit, an I/F conversion circuit, an RS422 interface and a CAN interface which are arranged on the circuit board;
the signal generator is used for generating an excitation signal of the optical fiber angular rate gyro sensor, the current-voltage conversion circuit is connected with the optical fiber angular rate gyro sensor, the I/F conversion circuit is connected with the three quartz flexible accelerometers, the AD conversion circuit is connected with the current-voltage conversion circuit and the I/F conversion circuit, and the RS422 interface and the CAN interface are connected with the AD conversion circuit;
the power panel provides power for the three optical fiber angular rate gyro sensors, the three quartz flexible accelerometers and the signal processing board.
2. The inertial measurement unit of claim 1, wherein the current-to-voltage conversion circuit converts the signal output by the fiber optic angular rate gyro sensor into a voltage signal; and the I/F conversion circuit converts the current signals output by the three quartz flexible accelerometers into frequency signals.
3. Inertial measurement unit according to claim 1 or 2, characterized in that the signal generator comprises an excitation current source for generating a current signal and a sensitive optical path for receiving the excitation current source signal.
4. The inertial measurement unit of claim 1, wherein the inertial measurement unit mounting bracket is a polygonal solid bracket.
5. The inertial measurement unit of claim 1, wherein the inertial measurement unit mounting bracket is a polygonal solid bracket comprising four rectangular sides and four arcuate connection faces connecting the rectangular sides.
6. The inertial measurement unit of claim 1, wherein the signal processing board is disposed on an upper end face of the inertial measurement unit mounting bracket and the quartz flexible accelerometer is disposed on a bottom plate of the inertial measurement unit mounting bracket.
7. The inertial measurement unit of claim 1, wherein the three fiber optic angular rate gyro sensors are disposed on 2 sides of the inertial measurement unit mounting bracket and on the upper surface of the base plate, respectively.
8. The inertial measurement unit of claim 1, wherein a filter circuit is further provided between the RS422 interface and the CAN interface and the AD conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922498855.2U CN212274945U (en) | 2019-12-31 | 2019-12-31 | Inertia measuring unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922498855.2U CN212274945U (en) | 2019-12-31 | 2019-12-31 | Inertia measuring unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212274945U true CN212274945U (en) | 2021-01-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922498855.2U Active CN212274945U (en) | 2019-12-31 | 2019-12-31 | Inertia measuring unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212274945U (en) |
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2019
- 2019-12-31 CN CN201922498855.2U patent/CN212274945U/en active Active
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