Successfully using Beidou navigation service in NAVIS
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Since December 27, 2012, the Beidou Navigation Satellite System officially started to provide the free civil navigation service to users in the Asia - Pacific region. After the official statement, we started to develop our first Beidou receiver, which is also among the firsts in the world. 

The Beidou Navigation Satellite System is a Chinese satellite navigation system. It consists of 2 separate satellite constellations-a limited test system that has been operating since 2000 and a full-scale global navigation system that is currently under construction. The first Beidou system, officially called the Beidou Satellite Navigation Experimental, in the period development, the system consists of three satellites. It provided navigation services for customers in China and neighboring regions, since 2000. The second Beidou system was initiated in 2004 and it became operational in China and neighbor countries in December 2011 with 10 satellites in use[1], and began offering services to customers in the Asia-Pacific region in December 2012. The third generation of the system will be developed continuously and available by 2020 with the global coverage capability.

With the objective of developing a multi-GNSS receiver, which could operate with all GNSS systems available, we started to work with Beidou signal right after the announcement from the Chinese goverment about the availability of the Beidou navigation signals. Our Beidou receiver, which is a part of the multi-GNSS NAVISOFT receiver, is now sucessful in decoding the E2-I civil signal, demodulating both the D1 and D2 types of navigation messages, and eventually computing the position, velocity and also timing results. Below are some figures of important signal processing blocks of the receiver:

Fig. 1: Results of (a) signal acquisition; (b) signal tracking and data demodulation; and signal power measurements

Fig. 2: Position computation results: yellow pins - computed positions; red pin - true location of the antenna on top of the Ta Quang Buu library building

This Beidou receiver contributes an important part to the NAVISOFT receiver developed by NAVIS. NAVISOFT works with not only all GNSSes (i.e. GPS/GLONASS/Galileo/Beidou) but also QZSS, which is a regional system of Japan and also broadcasts augmentation data for improving GNSS positioning. More importantly, beside stand-alone mode, in which each system operates independently, NAVISOFT also supports the real combined multi-GNSS mode, in which all satellites in view from all systems are utilized to provide a common positioning and navigation solution. Fig. 3 shows the sky plot of all satellites in view and combined positioning results reported by NAVISOFT:

Fig. 3: Skyplot of all satellites-in-view from all systems


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