High-Precision Attitude Angle Calculation Method Based on NAV6132B IMU and 3D Visualization

This article presents a high-precision and high-reliability attitude angle calculation method based on the NAV6132B inertial measurement unit (IMU). The method is based on the principle of quaternion and utilizes complementary filtering to obtain accurate attitude angle data from the IMU's collected data. Furthermore, an upper computer with 3D attitude display was developed on the LabVIEW platform using the calculated attitude angles.

The MEMS chip requires a 3.3V DC voltage supply, so a PCB board was designed which includes a step-down module to convert the 12V power supply to 3.3V using the FP6188 main chip. Additionally, a signal conversion module was added to convert the TTL level signal to RS232 level signal for easy data reading by a computer. Furthermore, the circuit design includes short circuit and reverse connection protection to ensure the safety of the power supply circuit. This circuit design effectively drives and reads data from the NAV6132B IMU, and has potential applications in the field of inertial navigation measurement and secondary power supply.

Next, the LabVIEW serial assistant program was developed to receive and parse data from the MEMS chip. The received data was then filtered and attitude angles were calculated using the quaternion algorithm. 3D attitude display was achieved on the LabVIEW platform based on the calculated attitude angles. To ensure system stability and safety, a module to monitor the temperature of the MEMS chip was designed, and an alarm device was added.

This article describes the design idea, hardware and software implementation process, as well as analysis and discussion of experimental data. The experimental results show that the system has high precision, good stability, and high reliability, and has good application prospects.