General support information

In scenarios that require high-precision inertial navigation, high-performance MEMS inertial sensors have been able to partially replace fiber optic gyroscopes (FOGs) in recent years, but whether it can be completely replaced depends on specific application requirements. For example, the MEMS IMU U6488 produced by Micro-Magic Inc., the bias instability of the gyroscope can reach 0.2°/h, and the accuracy of Zero bias stability (1 σ, 10s) can reach 1°/h; Random walk reaches 0.03 º/√hr; This product can replace low precision fiber optic gyroscopes to meet short-term high dynamic tasks (less than 30 minutes), or in GNSS assisted scenarios, the position error of combined navigation (such as RTK + high-precision MEMS) can be less than 1 meter.

In the signal acquisition of quartz flexible acceleration sensors, the current frequency conversion module based on charge integration performs well in anti-interference, dynamic range, resolution, and power consumption, especially suitable for weak signals, high noise environments, and low-power demand scenarios. Traditional AD conversion modules are more suitable for systems that require fixed sampling rates, multi-channel synchronization, or complex digital processing. When making a choice, it is necessary to weigh the characteristics of both based on the specific application.

Flux gate sensors are used to detect weak magnetic fields, such as in geomagnetic navigation and scientific instruments. When it comes to application scenarios that require low cost, low power consumption, and high frequency response (such as motor control and consumer electronics), choose Hall effect sensors.

Tactical grade MEMS gyroscopes (zero bias <1 °/hr) can achieve ± 0.5 °~1 ° north-seeking accuracy in static environments through multi position calibration (such as the 24-point method) and Kalman filtering, making them suitable for low-cost vehicle mounted/portable devices. However, in dynamic environments, the accuracy drops sharply, and long-term work requires auxiliary sensors (such as GNSS timing and Earth angular velocity synchronization).

NMEA stands for National Marine Electronics Association which has devised numerous data telegrams to allow vessel electronic equipment to communicate with each other. The NMEA 0183 Interface Standard defines electrical signal requirements, data transmission protocol and time, and specific sentence formats for a 4800-baud serial data bus. Each bus may have only one talker but many listeners. This standard is intended to support one-way serial data transmission from a single talker to one or more listeners. This data is in printable ASCII form and may include information such as position, speed, and depth.

More information is available from the NMEA website.

General Recommendations

• For long distances (industrial/automotive): Use CAN or RS-422.

• For short-distance PC peripherals: USB (with extenders if needed).

• Legacy systems: RS-232 is limited; prefer RS-422 for better range.

• Signal Integrity: Always use shielded twisted-pair (STP) cables in noisy environments.