顾及误差频谱特性的CHZ重力仪航空应用研究

Study on CHZ Gravimeter Applied in Airborne Gravimetry Involving Error Spectrum Characteristic

给出航空重力测量误差频域分析的方法,利用功率谱密度从频域分析航空标量重力测量系统恢复重力场的能力及影响因素。介绍CHZ重力仪的主要特点。利用实测空中重力异常数据及机载GPS动态加速度数据,结合航空重力测量的频谱范围,分析CHZ重力仪在不同阻尼系数下的动态性能。计算结果表明,采用合适的阻尼系数,CHZ重力仪能够被用于固定翼飞机的航空重力测量。

The method of error analysis in frequency domain for airborne gravimetry is introduced firstly. Here, the ability to recovery gravity field for airborne scalar gravimetry is assessed using power spectrum density of gravity signal and system noise in frequency domain, and error sources of airborne gravimetry are also discussed in different frequency bands. Then, the characteristics of CHZ Gravimeter are introduced. Meanwhile, the dynamic properties of CHZ gravimeter with different damp factors, which are based on frequency bands of airborne gravimetry, are analyzed using observed gravity anomalies and vertical acceleration data measured by airborne GPS. The result indicates that CHZ gravimeter with proper damp factor can meet the requirements of airborne gravirnetry for fixed wing aircraft.