摘要
单星定位技术由于具有隐蔽性高和设备简单等优势,在军事、民用方面都具有广阔的应用前景,但是同时也存在着定位时间长,卫星飞行成本高等问题。由于卫星在对地表辐射源的定位过程中,需要使用接收信号的多普勒频率进行位置解算,因此文中通过信号外推的方法,将卫星的接收信号进行合理外推,获得更多的多普勒信息,在保证一定定位精度的同时,减少了卫星的飞行时间与飞行成本。文中的研究内容主要集中在信号外推与单星定位两种算法的研究上,并将两种算法进行结合。鉴于此,文中对信号外推与单星定位算法进行了理论分析和仿真验证,主要研究内容包含以下几方面:首先,建立了单星定位中信号外推方法的模型与实现流程,并分别介绍了经典的Gerchberg-Papoulis外推算法,单星定位的数学模型与辐射源位置解算方法;其次,通过对线性调频信号的外推的研究,引入了分数傅里叶变换的概念,在实现了线性调频信号外推之后,将其外推方法类比到卫星接收信号的外推中,并且得到了信号的多普勒频率;最后,通过Satellite Tool Kit(STK)软件的仿真得到卫星的飞行速度、位置等星历信息,与多普勒频率一起代入单星定位的算法中。结果显示文中提出的方法在节省卫星飞行时间的同时,保证了定位的精度。并与不使用信号外推进行定位相比,定位精度有所提升。
Due to its advantages of high concealment and simple equipment,single-satellite positioning technology has broad prospects in military and civilian applications,but it also has the problems of long positioning time and high satellite flight costs.Because the satellite needs to use the Doppler frequency of the received signal to calculate the position during the positioning of the surface radiation source,this paper uses the method of signal extrapolation to reasonably extrapolate the received signal of the satellite to obtain more Doppler information,ensuring a certain positioning accuracy and reducing the flight time and cost of the satellite.The research content of this paper mainly focuses on the two algorithms of signal extrapolation and single-satellite positioning,and combines the two algorithms.Therefore,this paper conducts theoretical analysis and simulation verification of the signal extrapolation and single-satellite positioning algorithms.The main research content consists of the following aspects.First,the model and implementation process of the signal extrapolation method in single-satellite positioning are established,and the classic Gerchberg-Papoulis extrapolation algorithm,the mathematical model of single-satellite positioning and the radiation source position solving method are introduced respectively.Secondly,through the study of the extrapolation of the chirp signal,the concept of fractional Fourier transformation is introduced,and the extrapolation of the chirp signal is realized.After that,the extrapolation method is analogized to the extrapolation of the satellite received signal,and the Doppler frequency of the signal is obtained.Finally,through the simulation of Satellite Tool Kit(STK)software,the ephemeris information such as the satellite flight speed and position is obtained,and it is substituted into the single-satellite positioning algorithm together with the Doppler frequency.The results show that the method proposed in this paper can save the satellite flight time and ensure the po
作者
李方彪
邱焱
武闯闯
张敏洁
LI Fang-biao;QIU Yi;WU Chuang-chuang;ZHANG Min-jie(The 36^(th)Research Institute of China Electronics Technology Group Corporation,Jiaxing 710068,China)
出处
《中国电子科学研究院学报》
北大核心
2023年第7期597-604,共8页
Journal of China Academy of Electronics and Information Technology
关键词
信号外推
单星定位
多普勒效应
定位精度
signal extrapolation
single satellite positioning
Doppler effect
positioning accuracy
