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基于FPGA的硅微陀螺數字測控和溫補技術(shù)研究
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蘇州大學(xué)電子信息學(xué)院

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Research on Digital Measurement and Control and Temperature Compensation Technology of Silicon Micro Gyro Based on FPGA
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    摘要:

    硅微陀螺儀由陀螺結構和測控電路組成,隨著(zhù)模擬接口電路的日臻完善,陀螺儀性能的提升主要靠數字電路中的測控和補償算法。目前硅微陀螺測控電路正在向芯片化方向發(fā)展,為了加速硅微陀螺測控電路芯片化進(jìn)程,用Verilog硬件描述語(yǔ)言設計了AGC和PLL對陀螺幅度和相位進(jìn)行閉環(huán)控制,科氏力平衡進(jìn)行閉環(huán)檢測。對因加工造成的正交誤差,設計了正交校正閉環(huán)。根據溫度對陀螺儀的影響,對標度因數進(jìn)行線(xiàn)性補償,對零偏進(jìn)行了BP神經(jīng)網(wǎng)絡(luò )補償。實(shí)驗結果表明,該控制系統下AGC相對穩定性為124ppm,PLL相對穩定性為79.1ppm,常溫零偏穩定性為2.9o/h。在0℃到65℃溫度范圍內補償前零偏穩定性為17.7o/h,補償后零偏穩定性為9.1o/h,標度因數溫度靈敏度降低1個(gè)數量級,不僅提升了硅微陀螺儀的性能,也為陀螺ASIC設計奠定了良好基礎。

    Abstract:

    The silicon micro gyroscope consists of a gyroscope structure and a measurement and control circuit. With the improvement of analog interface circuits, the improvement of gyroscope performance mainly relies on the measurement and control and compensation algorithms in digital circuits. At present, the measurement and control circuits of silicon micro gyroscopes are developing towards chip based direction. In order to accelerate the process of chip based measurement and control circuits of silicon micro gyroscopes, Verilog HDL is used to design AGC and PLL for closed-loop control of gyroscope amplitude and phase, and Coriolis force balance for closed-loop detection. An orthogonal correction closed-loop was designed to address the orthogonal errors caused by processing. Based on the influence of temperature on the gyroscope, linear compensation was applied to the scale factor and BP neural network compensation was applied to zero bias. The experimental results show that under this control system, the relative stability of AGC is 124ppm, the relative stability of PLL is 79.1ppm, and the zero bias stability at room temperature is 2.9 o/h; The zero bias stability before compensation is 17.7 o/h within the temperature range of 0℃ to 65℃, and the zero bias stability after compensation is 9.1 o/h. The temperature sensitivity of the scaling factor is reduced by one order of magnitude. The research results not only improve the performance of silicon micro gyroscopes, but also lay a solid foundation for gyro ASIC design.

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胡遠,黃海濱,陳東傲,徐大誠.基于FPGA的硅微陀螺數字測控和溫補技術(shù)研究計算機測量與控制[J].,2024,32(2):29-35.

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  • 收稿日期:2023-03-29
  • 最后修改日期:2023-05-05
  • 錄用日期:2023-05-06
  • 在線(xiàn)發(fā)布日期: 2024-03-20
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