Digital demodulation circuit for rebalance loop of dynamic tuning gyroscope
A technology of dynamic tuning gyroscope and demodulation circuit, which is applied in the direction of rotating gyroscope, etc., can solve the problems of large size and complicated circuit, and achieve the effect of small size, simple and reliable circuit
Active Publication Date: 2015-10-14
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology
The output of this kind of demodulation circuit is an analog voltage quantity, and the circuit is complex and the size is large
Method used
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[0014] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0015] like figure 1 As shown, the present invention is a kind of digital demodulation circuit for power tuning gyroscope rebalancing circuit, is made up of clock source, FPGA chip, DDS chip and high-speed AD sampling chip; Clock source is the reference clock of the whole system, other clocks All are obtained by transforming the clock; in order to avoid unnecessary electromagnetic compatibility problems, the clock source adopts an active crystal oscillator, and the clock frequency is selected between 10MHz-30MHz. The following units are designed and implemented in the FPGA chip: PLL phase-locked loop times Frequency unit, AD sampling clock generation unit, phase adjustment unit, AD sampling control unit, DDS chip clock generation unit and DDS chip control unit; the clock source is quadrupled and multiplied by the PLL phase-locked loo...
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The invention belongs to the technical field of demodulation for the rebalance loop of a dynamic tuning gyroscope, and particularly relates to a digital demodulation circuit for rebalance loop of a dynamic tuning gyroscope. The digital demodulation circuit consists of a clock source, an FPGA chip, a DDS (Direct Digital Synthesizer) chip and a high-speed AD sampling chip, wherein a PLL (Phase Locked Loop) frequency multiplication unit, an AD sampling clock generation unit, a phase adjustment unit, an AD sampling control unit, a DDS chip clock generation unit and a DDS chip control unit are designed in the FPGA chip. When the position of a gyroscope rotor changes relative to that of a shell, a sine wave carrier signal containing rotor position information is output through a sensor coil. A main clock Fm is subjected to frequency division through the AD sampling clock generation unit so as to acquire rectangular wave pulse gating signal with frequency of F<jici>, and the high-speed AD sampling chip performs sampling in real time by virtue of the signal gating, wherein the sampling frequency is identical with the excitation frequency and the phase difference is constant. The AD sampling control unit is used for reading converted digital value, which is a demodulated direct current signal.
Description
technical field [0001] The invention belongs to the technical field of demodulation of a power tuning gyroscope rebalancing circuit, and in particular relates to a digital demodulation circuit for a power tuning gyroscope rebalancing circuit. Background technique [0002] The dynamic tuning gyroscope control circuit includes two parts: a rebalance control loop and an AC power supply circuit. The rotor position information in the rebalancing circuit is an AC signal, which needs to be converted into a DC signal through a demodulation circuit. At present, the commonly used demodulation circuit is generally completed by an analog multiplier or a switch circuit. After demodulation, an analog voltage is obtained. The output of this kind of demodulation circuit is an analog voltage quantity, and the circuit is complicated and the size is large. [0003] Therefore, there is an urgent need to develop a digital demodulation circuit for power tuning gyroscope rebalancing loop, throug...
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IPC IPC(8): G01C19/02
CPCG01C19/02
Inventor 李海滨杨丽王海军韦宇聪刘军文汤继兵
Owner BEIJING AUTOMATION CONTROL EQUIP INST