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Design and Realization on the System for Gravimeter Data Acquisition and Online Processing

Author: DuJiGuang
Tutor: LiuFanMing
School: Harbin Engineering University
Course: Precision instruments and machinery
Keywords: Gravity aided navigation Sea gravimeter Gravity correction Digital signal processing
CLC: TP274.2
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Abstract


Currently, the underwater vehicles mainly use inertial navigation system to navigate. However, the positioning error of inertial navigation system accumulates over time, it must be corrected or re-tune. Conventional method is to receive GPS radio navigation signals, or other active radio navigation signals. Since this method requires underwater vehicles surfaced or near-surface navigation, which greatly reduce theirs hidden. So no-source navigation systems, especial gravity aided navigation system, which does not need to send and receive outside signals rises gradually.The thesis took CHEKAN-AM marine gravity meter produced in Russian as background, studied the structure and working principle of it, analyses the work process and related algorithms of gravity sensor signal acquisition and data processing software. Considering with gravity aided navigation, we designed the system for gravimeter data acquisition and online processing.CHEKAN-AM-based marine gravimeter axis-symmetric dual quartz elastic pendulum as a sensor to measure the gravity anomaly, it is not the impact of horizontal acceleration, essentially eliminating the vertical acceleration and horizontal acceleration error caused by cross-coupling effect can be more work under adverse sea conditions.The system used linear CCDs to receive the angular displacement of the gravity sensor, the signal was sent into the data processing module after the analog-digital conversion, signal preprocessing in CPLD. Data processing module took the digital signal processor as core, achieved relative gravity computing, digital filtering, zero drift correction, Eotvos correction and spatial correction. The system can communicate in real time with the navigation system, provided real-time correction data of gravity to navigation system.It was verify that the CCD signal processing circuit can spot position detection by laboratory simulation experiments. The work function of data processing module was verified by testing the data processing module by the data got in the serial port when CHEKAN-AM marine gravity meter is running.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Data collection and processing systems
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