【摘 要】
：
The message service is the most distinctive part of the BeiDou System (BDS), whose coverage area will be expanded from China & surroundings to the global surface space at BDS-3 stage. This is an innov
【机 构】
：
Beijing Satellite Navigation Center, Beijing 100094, China
论文部分内容阅读
The message service is the most distinctive part of the BeiDou System (BDS), whose coverage area will be expanded from China & surroundings to the global surface space at BDS-3 stage. This is an innovative integration of a global mobile communications service in a Global Navigation Satellite System (GNSS), with great practical value and significant strategy. However, BeiDou Global Message service relies on the global Medium Earth Orbit (MEO) satellite constellation to achieve the global beam-forming, the space-borne antenna has smaller size and lower receiving gain than regional beam-forming, so a key issue in designing Global Message is the uplink signal synchronization segment to ensure the space-borne message receiver achieves fast and reliable capture of short burst signals at very low carrier-to-noise ratio (C/N0). In this paper comparing with the uplink channel in Radio Determination Satellite Service (RDSS) based on the BDS Geostationary Earth Orbit (GEO) satellites, the signal condition parameters of the optional BeiDou Global Message are calculated. Then the design scheme of the shortest length synchronization segment based on the constant false alarm and specified detection probability is given. According to this, a fast acquisition algorithm for the uplink message receiver based on MEO satellite is proposed. Finally, through software simulation analysis and ground equipment testing the proposed signal design scheme is proved , as well as the fast acquisition algorithm with high-reliability reception of short burst signals in the condition of signal-to-noise ratio lower than 34dBHz. The research results of this paper provide important technical support for the overall design of Global Message service in BDS-3, and will be further tested in the subsequent actual applications. It is also hoped to provide theoretical basis for the continuous optimization of Global Messages in the future BDS.
其他文献
Since December 27, 2012, BDS-2 has provided navigation, positioning and timing (PNT) services in the Asia Pacific region. From November 2017 to the end of August 2018, the BeiDou Global System (BDS-3)
When the navigation satellite GEO performs a station keeping, high-precision orbit elements are required. The analytical solution can hardly meet the high-precision requirement while the spectrum anal
The multipath of BDS-2 medium earth orbit (MEO) satellites and BDS-3 satellites is analyzed. The multipath bias of BDS-2 satellites is corrected by second order polynomial fitting. By calculating Pear
The BDS-3 basic system has already been established, starting to provide global service. As a new generation navigation system, the BDS-3 adopts a global ionospheric model, called BDGIM. Single-freque
Earth Rotation Parameter (ERP) is one of the most important parameters in the area of positioning and navigation, autonomous orbit determination and Earth reference framework. However, due to the rest
Adaptive antenna array technology used to improve the anti-jamming ability of navigation receiver now. Inversion process in adaptive antenna array anti-jamming is complicated in FPGA, which takes up a
Given the communication features of STDMA among inter-satellite links, this the-sis proposed a hierarchical planning method for the inter-satellite links network of navigation constellation. First, we
The GNSS signals are vulnerable to radio frequency interferences. Among these interferences, continuous wave interferences (CWIs) are able to jam the GNSS signals. After pulse-modulation, the CWIs fur
In this paper, we systematically discussed and analyzed the uncertainties of four typical time transfer links, including the satellite-ground two-way link, the satellite-ground lambda link, the ground
This paper focuses on the approach to attitude estimation. When describing the attitude of a dynamic object, the quaternion has a better numerical continuity and stability compared with other conventi