基于二维激光多普勒测速仪的捷联式车载自主重力测量方法  

Strapdown vehicle autonomous gravimetry method based on twodimensional laser Doppler velocimeter

作　　者：魏国 杨泽坤 高春峰 周健[1,2] 于旭东 罗晖[1,2] 邓斌[1,2] 周文健 程嘉奕 Wei Guo;Yang Zekun;Gao Chunfeng;Zhou Jian;Yu Xudong;Luo Hui;Deng Bin;Zhou Wenjian;Cheng Jiayi(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073

出　　处：《红外与激光工程》2023年第6期331-338,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金(62203454)。

摘　　要：传统的车载重力测量通常采用捷联惯导系统(Strapdown Inertial Navigation System,SINS)/全球导航卫星定位系统(Global Navigation Satellite System,GNSS)组合的方式,但是在如山谷、隧道以及高楼林立等特殊环境下,GNSS信号会受到遮挡,导致重力测量系统精度下降。针对特殊环境下传统车载重力测量方法精度下降的问题,提出了一种基于捷联惯导系统/二维激光多普勒测速仪(Laser Doppler Velocimeter,LDV)组合的车载重力测量方式,分析了系统重力测量原理和误差模型,设计了滤波器方案,通过车载重力测量实验对系统精度进行了验证。实验针对丛林遮蔽的山地环境下完成了六条重复测线重力测量,同时比对SINS/GNSS组合重力测量系统的测量精度,其中SINS/GNSS组合系统的单条测线内符合精度最大为2.46 mGal,最小为1.03 mGal,总内符合精度为1.53 mGal;SINS/LDV组合系统的单条测线内符合精度最大为1.05 mGal,最小为0.47 mGal,总内符合精度为0.70 mGal,其总内符合精度相比于SINS/GNSS组合系统提高了约53%。车载重力测量实验证明了SINS/LDV组合重力测量系统在卫星信号拒止环境下的有效性。Objective As one of the basic physical fields of the earth,gravity field reflects the distribution of underground materials and the changes of space and time.It has important value in resource exploration,military application and space science research.At present,the measurement methods of earth gravity field include aerial gravimetry,marine gravimetry,satellite gravimetry and ground gravimetry,et al.As an important method of gravity field measurement,ground gravimetry is mainly used for local fine construction of earth gravity field,which can be divided into ground static gravimetry and ground dynamic gravimetry.Due to the high cost and low efficiency of ground static gravimetry,ground dynamic gravimetry is usually adopted,namely ground vehicle gravimetry.At present,strapdown inertial navigation system(SINS)/global navigation satellite system(GNSS)integrated system is usually used in vehicle gravimetry,which lacks autonomy and has limited accuracy in the special environment where GNSS signal is blocked.To solve this problem,this paper proposes a strapdown vehicle autonomous gravimetry method based on two-dimensional laser Doppler velocimeter(LDV).Methods In this paper,a high-precision autonomous vehicle gravimetry method is designed.In order to improve the autonomy of the system,SINS/LDV integrated system is adopted in this paper,which does not need to rely on external signal sources.In order to ensure the measurement accuracy of the system,the LDV adopted by the system is two-dimensional,which is sensitive to the velocity of the vertical direction,so as to reduce the measurement error.The systematic errors are analyzed,and the constraints on the device accuracy and measurement scheme of LDV are proposed(Tab.1).The data processing flow of SINS/LDV integrated gravimetry system is also proposed.The system can finally realize the high-precision gravimetry in special environment.Result and Discussions The experiment was conducted in a special environment.During the experiment,the altitude changed greatly(Fig.4)and t

关 键 词：车载重力测量 二维激光多普勒测速仪 捷联惯导系统 组合导航 内符合精度 

分 类 号：P223[天文地球—大地测量学与测量工程]