Design And Implementation Of The Measurement System About The Double-star Passive Positioning

With the rapid development of radio communication technology and digital signalprocessing technology, satellite positioning technology has been greatly developed. Thesatellite passive positioning technology is one of the hidden satellite positioningtechnology, mainly used in the military field.The accuracy of joint positioning with frequency difference of arrival(FDOA) andtime difference of arrival(TDOA) is determined by the baseline distance between thesatellites，the satellite velocity and position,the radiation signal carrier frequency andother parameters. Therefore, the measurement accuracy of the inter-satellite ranging,velocimetry,and baseline is directly related to the system positioning performance.Thepaper introduction the Basic theory of the frequency difference of arrival and timedifference of arrival positioning technology; By the derivation and analysis of thepositioning principle and algorithm of double-star positioning with TDOA and FDOA,research the Related technology of co-locating with TDOA and FDOA,then simulateand analyze the positioning error. The main work of the paper is the research of theinter-satellite measurement techniques for double-star passive positioning system;analysis of the impact of positioning accuracy by the parameters measured in theinter-satellite; designing and implementation of the inter-satellite measurement systemto mearsure the time difference measuring binary frequency poor,velocity,pseudo-range values, frequency offset, etc for the double-star positioning performanceanalysis. The innovation of this paper is the joint discussion of the double Star passivepositioning performance and the measurement accuracy of inter-satellite parameters,intuitively analysis of the impact factor of a binary star passive positioning systempositioning accuracy by the inter-satellite measurement system design and realization.By the simulation and analysis, we discovery that the positioning error is the basiclinear relationship with the error of TDOA and FDOA; positioning error is the quadraticrelationship with the error of the baseline measurement and satellite velocity；Thelower the satellite orbit, positioning error will be the smaller. Although the low earth orbit satellite coverage, higher positioning accuracy, so the satellite’s orbit planningmeasure the full range. In this paper,, the work involved also i including RS-232,RS-422, CAN bus interface,the sending and receiving of the data, data showingand the error rate statistics the inter-satellitemeasurement system implementationprocess.