Simulation Research On Gravity Gradient Of Full Tensor Rotary Accelerometer

Gravity gradiometer is to measure and obtain the change of gravity in earth space through multiple accelerometers.It can obtain smaller-scale spatial distribution characteristics,more finely describe the gravity feature information of the measurement area,and more prominently highlight local information.The characteristics of precision and high resolution are of great significance to the exploration of oil and gas and mineral resources.The research work and results of this paper are as follows:Carry out simulation research on the umbrella-type full-tensor rotation accelerometer gravity gradiometer.Starting from the measurement principle of the umbrella-type full-tensor rotation accelerometer gravity gradiometer,the full tensor gravity from the umbrella measurement coordinate system to the platform coordinate system is given.The gradient information transformation matrix is used to deduce the output expression of the accelerometer on each disc of the umbrella-type full-tensor rotational accelerometer gravity gradiometer.The gravity gradient demodulation method is obtained from the combined output expression of the accelerometer,and the gravity gradient information of the umbrella full tensor rotation accelerometer can be extracted.The performance of the umbrella-type full-tensor rotation accelerometer gravity gradient signal simulation system is tested,and the three-disk accelerometer data of the umbrella-type gravity gradiometer under ideal conditions,including radial error,quadratic term error,and scale factor inconsistency are generated by MATLAB.The accelerometer data under four different conditions,such as error and instantaneous attitude angle,are loaded into the simulation system for experiments,simulating the results of gravity gradient measurement under various conditions,and comparing the experimental results with the theoretical values to verify the stability of the system and reliability.The research results of this paper provide a theoretical basis for the development of umbrella type full tensor rotating accelerometer gravity gradiometer in China,and have important reference value.