重力梯度仪仿真系统设计

为了研究旋转加速度计重力梯度仪信号产生和处理方法，设计了重力梯度仪半实物仿真系统。首先依据重力梯度仪的测量原理计算出由地下某异常体引起的重力梯度异常值，利用加速度计的输出公式，通过LabVIEW对全张量重力梯度仪的12 个加速度计输出信号进行仿真，并对仿真信号进行解调，得到全张量重力梯度值。以单圆盘为例进行半实物仿真，由计算机A 产生加速度信号经过硬件电路后，通过计算机B 对调理过的加速度计信号进行中值滤波和解调，从而获得重力梯度异常值，精度为100 E。这种仿真系统的设计可以对全张量的重力梯度进行解调，突破了解调单圆盘信号的局限性，引入的半实物仿真增加算法的可靠性和仿真的可信度，对重力梯度仪的参数设计和实物制造有参考意义。

Design of Gravity Gradiometer Simulation System

In order to study the signal generation and signal processing methods of the rotational accelerometergravity gradient instrument，a semi-physical simulation system for the gravity gradient instrument is designed．First，the gravity gradient anomaly caused by an anomalous body in the ground is calculated according to themeasurement principle of the gravity gradient instrument． Using the output formula of the accelerometer，the 12accelerometers’output signals of the full tensor gravity gradient instrument are simulated by LabVIEW． Thesimulation signal is demodulated to obtain the full tensor gravity gradient value． A single disc is taken as anexample for semi-physical simulation． After the acceleration signal generated by computer A passes through thehardware circuit，the median filtering and demodulation of the conditioned accelerometer signal by computer Bwill obtain the abnormal value of gravity gradient with an accuracy of 100E． The design of this simulation systemcan demodulate the gravitational gradient of the full tensor，which breaks through the limitation of demodulatingsingle disc signal． The introduced semi-physical simulation increases the reliability of the algorithm and thecredibility of the simulation． The physical manufacturing has reference significance．