Simulation Research On Full Tensor Gravity Gradient

The full tensor gravity gradient information is a very beneficial resource for the economy,national defense,and society.Therefore,it is very important to carry out research on the key technologies of the full tensor gravity gradiometer.Although great progress has been made in some tensor gravity gradiometers in China in recent years,the signal characteristics and data processing of full tensor gravity gradiometers have not been studied in depth.This paper focuses on the research of the umbrella-shaped full-tensor rotating accelerometer gravity gradiometer.The main work content and results are as follows:Starting from the working principle of the rotating accelerometer gravity gradiometer,the difference between the two structures of the full tensor gravity gradiometer is analyzed,and the gradient information conversion formula of the umbrella-type full tensor gravity gradiometer is given.The accelerometer signal model and the combined output formula of the accelerometer on the gravity gradiometer disc are given,and the output error of the accelerometer is analyzed from the accelerometer performance and installation.The full tensor gravity gradiometer simulation system has been designed and built.The accelerometer signal of the umbrella full tensor gravity gradiometer was calculated by matlab as the input of the simulation system.The ideal umbrella type full tensor gravity gradient accelerometer signal is loaded into the simulation system,and the received signal is analyzed to get the actual amplification factor and phase difference of the simulation system.The full tensor information in the platform coordinate system can be calculated according to the gravity gradient information demodulated by the system.Use matlab to generate accelerometer signals containing different quadratic errors and the results are analyzed and compared,which are consistent with the theoretical analysis of quadratic errors.The accelerometer signals of the three disks on the umbrella type full tensor gravity gradiometer including the quadratic errors are used as the input of the simulation system to carry out experiments.The gravity gradient information obtained by the system demodulation is analyzed.The error between the experimental results and the theoretical value is controlled within 1E,which verifies the stability and feasibility of the simulation system.