关键词: 全张量重力梯度仪, 动态环境, 固有噪声, 自身梯度校正, 点质量源

Abstract:

For the high precision full tensor gravity gradiometry(FTG)used in airborne moving platform，the authors  study the difference composite structure of gradiometry，which have 12 accelerometers installed on three different rotation disc. Upon confirmation of the structure which can restrain the common mode acceleration，reduce the interference of extent environment and have the advantage of high precision detection，the authors  analyze the error sources and influences in gradiometer measurements. Research shows that main effects include instrument inherent random noise and external deterministic noise. In order to describe the influence quantificationally，the authors derived the measuring equation of FTG in the dynamic environment, and analyzed the noise level of intrinsic factors in time domain and frequency domain, identified three main intrinsic factors: Accelerometer’sperformance mismatching；Platform instability and unstable disc rotating speed.Experiments using Simulink system can obtain the noise level of intrinsic factors and put forward the inhibition scheme. Aiming at the external deterministic noise，we also analyzed the influence of changing of attitude and quality in flight to measured gradients and put forward a method to correct the self-gradient based on a point mass.

Key words: full tensor gravity gradiometry, dynamic environment, inherent noise, self-gradient correct, point mass