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Laser gyro SINS component data acquisition circuit design and implementation

Author: XieXuZuo
Tutor: LiJinMing
School: University of North
Course: Circuits and Systems
Keywords: Laser gyro Data collection FIR filter Precision AD
CLC: TN79
Type: Master's thesis
Year: 2011
Downloads: 129
Quote: 0
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Abstract


Laser gyro inertial SINS component as an ideal instrument navigation system , inertial navigation system at home and abroad has been widely used , is the focus of the study in today's inertial navigation system . As the laser gyro mechanical Dithered techniques to reduce blocking error , which is bound to the output of the laser gyro dither signal and the introduction of random noise , it is necessary to dither signal and random noise filtering to eliminate . However, to the laser gyro output signal is filtered , the most effective way is through SINS component data acquisition circuitry to digital filtering approach to implementation. Quartz inertial accelerometers component output signal of the displacement signal navigation solution , the accuracy of attitude affects the accuracy of calculation , so the signal needs to be collected using the AD conversion accuracy . Improve the accuracy of the data acquisition circuit is required SINS research focus direction . This paper introduces the working principle of laser gyro and the error caused by blocking effects , and ways to eliminate mechanical latching error Dithered technology to elaborate . FIR linear phase filter with a strict and stable system , to meet the laser gyro output signal filtering requirements , this system uses a FIR filter to remove high frequency Dithered and random noise signals. In order to reduce the volume of data acquisition circuit to improve the accuracy of data collection and transmission synchronization, the design uses an FPGA for signal acquisition and realization of FIR digital filter function ; quartz flexible accelerometer output analog signal using the 18-bit AD converter to convert. In this paper, the system hardware design and programming are explained in detail , focusing on the AD driver circuit , FIR filter module and AD acquisition and control module design . To further validate the correctness of acquisition circuit , on INS experiments were carried out to further verify the correctness of the data acquisition circuit design .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Digital circuits
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