Research Of Orientation Determination Technology Based On BDS Single Epoch Dual Frequency And Multiple Constraints

Satellite orientation determination technology,based on carrier signal interference principle,is to get the vector between two points in space.It is relatively low cost,fast initialization and has no accumulated error compared with inertial navigation system.Beidou Navigation Satellite System(BDS)is our country's independently developed system,it has covered the Asia Pacific region,and will cover the world in the future.The study of orientation determination based on BDS is important to national defense and civil use.Along with the publishing of B1 I and B2 I frequency points,research and application of orientation determination based on BDS dual frequency has becoming the new hotspot.This thesis elaborates the orientation determination algorithm on BDS dual frequency.We use the wide-lane combination to amplify wave length,reduce searching scope,and increase calculating speed.For the most important part of satellite orientation determination—the integer ambiguity calculating,we use double difference pseudorange equation to estimate it.Based on double difference carrier phase observation equations,we optimize the least-square ambiguity searching method with base-line constraint,angle constraint and pre-judgement.Finally we use ratio test to affirm integer ambiguity,and the dual frequency confirming method to assure the results.In this thesis,the measuring system based on dual frequency receiver,measuring antenna and upper computer is established.We program the resolving software to calculate the yaw,pitch and baseline length.The experimental result shows that the proposed method can increase calculation speed and improve orientation accuracy.Our proposed orientation determination method is fast in initialization and calculation,meets the real time demand with high accuracy.It can be used in various occasions such as sail navigation,aerocraft orientation and so on.