With the rapid development of China's aviation industry, an increasing number of aircraft designed by Chinese engineers are now soaring through the skies. To accurately record the performance parameters of various onboard systems during flight, a reliable flight parameter recording instrument is essential for real-time data acquisition. Given the diversity of equipment, interface types, and signal formats found on modern aircraft, it is crucial that the flight parameter collector be compact in size to accommodate both large and small aircraft models.
To meet these requirements, using a highly integrated chip with multiple functional modules is the most efficient approach. This avoids the need for multiple separate chips, which can lead to larger device sizes and reduced system coordination. The S698-T chip, developed by Zhuhai Oubit Control Engineering Co., Ltd., is a 32-bit RISC processor based on the SPARC V8 architecture (IEEE-1754) and includes a 64-bit dual-precision floating-point unit (FPU) compliant with IEEE-754 standards. Fabricated in a 130 nm CMOS process, the S698-T is housed in a BGA352 package and integrates numerous functions such as a 1553B bus controller, ARINC429 bus controller, CAN bus controller, multi-function I/O interface, MARS interface, online hardware debugging support unit (DSM), DAC module, ADC module, and more.
The flight parameter collector is designed to perform high-precision acquisition of input channel parameters and output them to the recorder in a specified format. It connects to a host computer via Ethernet for configuration, data calibration, historical data retrieval, and data upload. The device features an internal real-time clock, ensuring time-stamped data collection. It supports 8 high-speed sampling channels, which can function as virtual oscilloscopes in debug mode. The CAN bus allows for expansion of the acquisition channels, while the system includes power-on self-test, cycle self-test, and maintenance self-test capabilities, along with EMI/EMC design to enhance electromagnetic compatibility.
The collector is modularly designed, consisting of six main components: the power module, main control module, switch signal acquisition module, analog signal acquisition module, AC signal acquisition module, and motherboard. The power module provides stable DC-DC conversion, while the main control module handles system control, aviation bus interfaces (including 1553B, ARINC429, CAN, RS422, RS232, and Ethernet), and onboard cache. The switch signal acquisition module processes 90-channel switch signals, while the analog module captures fuel consumption signals, mV-level analog inputs, differential DC signals, and high-speed sampling data. The AC signal acquisition module manages 36–380 V AC analog signals and three-phase synchronization signals.
The FPGA plays a central role in the system, handling multiple tasks across different modules. It includes HDLC bus interface controllers, RS232 and RS422 bus controllers, GPIO interfaces, memory control, and heartbeat pulse generation. Each module has its own FPGA, responsible for configuring channels, acquiring data at high speeds, and storing results for retrieval by the S698-T. The overall system is designed to be robust, scalable, and adaptable to a wide range of aircraft configurations.
In conclusion, extensive testing and field deployment have demonstrated that the flight parameter collector based on the S698-T chip meets all practical requirements. It is now widely used in actual aviation applications, proving its reliability and efficiency in real-world scenarios.
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