Fast Position and Velocity Determination for Pulsar Navigation Using NML and LSM  

作　　者：LIU Jin WU Jin XIONG Ling FANG Jiancheng LIU Gang 

机构地区：[1]College of Information Science and Engineering, Wuhan University of Science and Technology [2]School of Instrumentation Science and Opto-electronics Engineering, Beihang University

出　　处：《Chinese Journal of Electronics》2017年第6期1325-1329,共5页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61501336,No.61104191);the State Key Program of National Natural Science Foundation of China(No.61233005);the National Basic Research Program of China(No.2014CB744202)

摘　　要：To reduce the computational cost, a Fast position and velocity joint determination(FPVD) method based on the Near-maximum likelihood(NML) and the Least square method(LSM) is proposed for X-ray pulsar navigation. Considering the fact that the Doppler effects caused by the velocity of the spacecraft alters the X-ray pulse Time-of-arrival(TOA), we adopt the NML to obtain multi-TOAs, and then utilize the LSM to estimate the variation of TOAs instead of the pulsar profile distortion adopted by the Maximum-likelihood(ML) estimation method. Finally, according to the variation value and TOAs, the position and velocity information of the spacecraft are calculated. The simulation results have demonstrated that the FPVD method is far faster than the ML estimation method, and its accuracy approaches the CramerRao lower bound(CRLB).To reduce the computational cost, a Fast position and velocity joint determination（FPVD） method based on the Near-maximum likelihood（NML） and the Least square method（LSM） is proposed for X-ray pulsar navigation. Considering the fact that the Doppler effects caused by the velocity of the spacecraft alters the X-ray pulse Time-of-arrival（TOA）, we adopt the NML to obtain multi-TOAs, and then utilize the LSM to estimate the variation of TOAs instead of the pulsar profile distortion adopted by the Maximum-likelihood（ML） estimation method. Finally, according to the variation value and TOAs, the position and velocity information of the spacecraft are calculated. The simulation results have demonstrated that the FPVD method is far faster than the ML estimation method, and its accuracy approaches the CramerRao lower bound（CRLB）.

关 键 词：Velocity determination Pulsar Maximum likelihood Least square method 

分 类 号：V448.2[航空宇航科学与技术—飞行器设计]