Research On Signals Detecting And Processing Of Ocean Gravimeter

Consider to the needs of inertial navigation/gravity integrated navigation system, the database of gravity map of the area where vehicle will be navigated must be established at first. The data of the database is obtained by ocean gravimeter, an other hand, when vehicle works, the gravity must be measured by ocean gravimeter to reduce the error of inertial navigation system by map matching.For the purpose of inertial navigation/gravity integrated navigation system, this article analyses the principle of ocean gravimeter sensors and the way for detecting and processing of their signal.At first, this article analyses the theory and particularity of ocean gravity measurement, then talks about the operation principle of many ocean gravimeters and their merits and demerits.Secondly, the CHZ ocean gravimeter sensor is analyzed, and it's mathematical model is obtained. On the basis of it, the article designs the simulator of the CHZ ocean gravimeter sensor and it's signal detecting solution. The way for processing data of ocean gravimeter and main measurement error is researched, those include Eotvos correcting and error analyzing ,design of LP filter for eliminating the disturbing acceleration, "zero excursion" of gravimeter correcting and analyzing of the effect of temperature upon gravity measurement.Finally, this article designs on-based DSP hardware to detect the ocean gravimeter simulator's signal that has been designed. The software is programmed to process the obtained data by making use of high-speed performance of DSP. The programs accomplish communication with navigation computer.The work in this paper can benefit inertial navigation/gravity integrated navigation system.