如何实现有源宽带低噪声的接收,尤其是共用宽带多频段的接收,一直以来都是一个关键而棘手的问题.本文设计了一种导航复合通信天馈系统,顶端采用一款成熟的UHF发射天线,天线的馈线从下端的辐射体穿过,实现UHF的通信收发功能,下端采用穿管的金属外护筒实现天线级联,并通过有源匹配网络后为多个频段设备提供导航信号接收.仿真和实测结果表明级联天线在工作频带400～470MHz内的VSWR均在2.5以下,经过下端
Commonly,X-ray Pulsar Navigation should observe three pulsars to determine the position of the detector.It leads to at least three detectors should be equipped.In this paper,an initial orbit determina
The widespread deployment of Wi-Fi communication makes it easy to find Wi-Fi access points in the indoor environment,which enables us to use them for Wi-Fi fingerprint positioning.Although much resear
The Dual One Way Ranging (DOWR) technique with PRN-code,which can remove the effect of time-asynchronous and improve ranging precision,is widely used in Inter-Satellite-Ranging.The ranging value based
This paper mainly focuses on the combination of station coordinates and ERPs and the realization of TRF based on four technologies GPS,VLBI,SLR and DORIS,and discussed some key points including the co
This paper develops a new cycle slip detection and repair method that is based on polynomial-fitting ionosphere-free combination and ionosphere total electron contents(TEC) rate(TECR),and uses dual-fr
The navigation satellite navigation autonomous health management system based on cognitive technology is an advanced intelligent spatial information processing system.It takes the working mode and mec
Earth Rotation Parameters (ERP) are the necessary parameters to achieve mutual conversion of the celestial reference frame and earth reference frame.It is the requirements of national economic constru
Multipath is the dominant source of positioning error in modern GNSS receiver.Maximum likelihood (ML) parameter estimation is an optimal method to mitigate the multipath effects while ML involves nonl
With the application of Chinese Beidou satellite navigation system more and more widely,its existing navigation accuracy and timeliness can not meet the requirements for use,how to improve the accurac