The Critical Bridge from Analog to Digital: High-Precision ADC Enables a Leap in Inertial Navigation Precision

In the fields of inertial navigation, aerospace, and precision industrial measurement, high-precision and highly synchronized acquisition of physical signals is the core to ensuring system performance. The 32-bit high-precision A/D conversion circuit specifically designed for accelerometers, introduced by Micro-Magic Inc, is a key component tailored for such high-end applications. With its exceptional performance and flexible architecture, it provides a solid foundation for building reliable high-precision inertial navigation signal acquisition systems.

The core advantage of this A/D board lies in its exceptionally high measurement accuracy and stability. Supporting a current input range of ±50mA, combined with 32-bit A/D conversion capability, it can precisely capture minute current variations output by accelerometers. Within the full operating temperature range (-40°C to +70°C), its zero temperature coefficient is better than ±2nA/°C, and the scale factor temperature coefficient is below 3.0 ppm/°C. This means the system can maintain extremely low measurement drift even under complex ambient temperature fluctuations, ensuring long-term accuracy in navigation solutions. Additionally, the product boasts ultra-high stability, with zero stability and scale factor stability reaching the nA and ppm levels respectively, guaranteeing repeatable and reliable data output while effectively reducing the system's noise floor.

Inertial navigation systems require extremely strict synchronization of multi axis data. This A/D board provides a precise synchronization solution to ensure data spatiotemporal consistency:

  Internal/external synchronization mode: it can be flexibly switched according to system instructions. In internal synchronization mode, the board autonomously generates a sampling clock; In external synchronization mode, RS422 differential synchronization signals are received from the navigation computer to achieve a unified sampling time for the entire system, perfectly eliminating timing errors between channels.

⚪  Latching and triggering: Latching the A/D values of all channels at the falling edge of the synchronization signal ensures that the acceleration and temperature data of the X, Y, and Z axes are captured at the same moment, providing a spatiotemporal consistent data source for subsequent navigation algorithms.

Inertial navigation systems require extremely strict synchronization of multi axis data. This A/D board provides a precise synchronization solution to ensure data spatiotemporal consistency:

⚪  Internal/external synchronization mode: it can be flexibly switched according to system instructions. In internal synchronization mode, the board autonomously generates a sampling clock; In external synchronization mode, RS422 differential synchronization signals are received from the navigation computer to achieve a unified sampling time for the entire system, perfectly eliminating timing errors between channels.

⚪  Latching and triggering: Latching the A/D values of all channels at the falling edge of the synchronization signal ensures that the acceleration and temperature data of the X, Y, and Z axes are captured at the same moment, providing a spatiotemporal consistent data source for subsequent navigation algorithms.

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