In response to the problems of requiring initial values and repeated iterations in traditional four star time difference positioning algorithms such as the least squares method,the Bancroft algorithm is proposed to the four star time difference positioning system for the positioning of non cooperative targets such as GNSS interference sources by this paper.A three-dimensional positioning formula based on the Bancroft algorithm is derived,and a forward solution discrimination method and algorithm calculation process are provided,which can meet the requirements of in-orbit processing automatically.The simulation results based on the four-star passive positioning system show that the Bancroft method has the same positioning accuracy as the least squares method,and has the technical advantages of simple and reliable calculation,and easy autonomous calculation in-orbit.It is particularly suitable for four-star time difference positioning systems.
维普
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