高动态环境IMU辅助GPS捕获技术  

IMU-Aided GPS Signal Acquisition under High Dynamic Environment

作　　者：单童[1] 陈帅[1] 王磊杰[1] 朱源魁 

机构地区：[1]南京理工大学自动化学院,江苏南京210094

出　　处：《信息与控制》2014年第1期43-48,55,共7页Information and Control

基　　金：国家自然科学基金资助项目(U1330133);江苏省自然科学基金资助项目(BK20130774)

摘　　要：远程制导火箭弹这类武器,在飞行中会产生较大的多普勒频移,给GPS信号的捕获带来困难,运用IMU(惯性测量单元)辅助GPS捕获的方法可以有效解决这一问题,提高GPS信号的捕获速度.该方法针对实际应用的需求,在传统串行捕获方式的基础上,运用深组合导航技术原理,将IMU的速度位置信息与星历相结合,实时解算出载体运行时产生的多普勒频移,调整载波频率.半实物仿真实验表明,该法将频率搜索范围缩小至1个频带,搜索次数仅为1次,加快了GPS接收机粗捕获速度;此外,该法还有助于载体在失锁情况下进行快速重捕,有效缩短丢星时间,进一步提高接收机的动态性能.The flight of the weapons such as long-range rockets typically causes a large Doppler shift, which causes difficulty in GPS signal acquisition. Using the inertial measurement unit （IMU） method to aid the GPS signal acquisition can be an effective solution to this problem. According to the actual application, this method uses the principle of deep integrated navigation on the basis of a traditional serial capture, which combines the e- phemeris with the velocity and position information in the IMU, to estimate the Doppler shift and adjust the frequency of the cartier. We find that this approach decreases the frequency range to one band and increases the acquisition speed using only one search. Furthermore, this method can be used in the case of losing lock, which demonstrates the capability of reducing the acquisition time and improving the acquisition performance of high-dynamic GPS receiver.

关 键 词：高动态 IMU信息 快速捕获 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计]