# An In-Depth Assessment of the New BDS-3 B1C and B2a Signals
## 8 Conclusions  
The analysis result of this contribution is the panorama of the new BDS-3 signal, including B1C and B2a. Compared with BDS-2 satellites signal, B1C/B2a has better signal strength, and the C/N\({}_{0}\) of B2a signal is about 3 dB higher than other signals. The code observation accuracy of B1C/B2a is about 0.05 m higher than that of traditional B1/B2/B3 signal, especially that of B2a is better than 0.15 m. The double difference results of the zero-baseline show that the observation accuracy of B1C/L1/E1/L1 (QZSS) is between 1.2 and 1.4 mm and that of B2a/L5/E5A/L5 is slightly worse, between 1.3 and 1.6 mm, which is consistent with the results of the zero-baseline solution. It should be noted that the performance of the J01 satellite has declined due to its launch for more than ten years. In the future, the authors plan to evaluate and study the accuracy of B2B PPP and Bs signal of BDS-3 in the next step. In addition, the same frequency signals of NAVIC are evaluated and compared. Conceptualization, Q.Z. ; data curation, Y.Z. and Q.Z. ; formal analysis, Q.Z.and Z.C. ; writing--original draft, Q.Z. All authors have read and agreed to the published version of the manuscript. This work was carried out with the support of the National Natural Science Foundation of China under Grant 41604024 and Open Fund of State Key Laboratory of Geographic Information Engineering under Grant SKLGIE2013-M-2-1. Not applicable. Upon a reasonable request, the observation data are available from the corresponding author ([PERSON]). The authors would like to thank the IGS for making available the GNSS mixed navigation messages, and the GNSS data processing software named GNSSer (GNSS Parallelable Data Processor) for their permission to use the GNSS data parallel processing tool ([[http://www.gnsser.com](http://www.gnsser.com)]([http://www.gnsser.com](http://www.gnsser.com))). We thank [PERSON] of Shihezi University for her linguistic assistance during the revision of this manuscript. The authors declare no conflict of interest. * _[PERSON] et al. (2006)_ [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; et al. MBOC: The new optimized spreading modulation recommended for Galileo L1 OS and GPS L1C. In Proceedings of the IEEE/ION PLANS, Coronado, CA, USA, 25-27 April 2006; Volume 2006, pp. 884-892. * _[PERSON] et al. (2015)_ [PERSON]; [PERSON]; [PERSON] Galileo Signals. In _GALILEO Positioning Technology_; Springer: Dordrecht, The Netherlands, 2015. * _[PERSON] et al. (2020)_ [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] BDS multi-frequency PPP ambiguity resolution with new B2a/B2b/B2a + b signals and legacy B1I/B3I signals. _J. Geod._**2020**, _94_, 107. [CrossRef]
* _[PERSON] et al. (2020)_ [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning. _Remote Sens._**2020**, _12_, 2081. [CrossRef]
* _[PERSON] et al. (2012)_ [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5 aQ signals. _GPS Solut._**2012**, _16_, 53-64. [CrossRef]
* _[PERSON] et al. (2015)_ [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] Performance evaluation of carrier-to-noise density ratio estimation techniques for BeiDou Bl signal. In _Ubiquitous Positioning, Indoor Navigation & Location-Based Services_; IEEE: Corpus Christi, TX, USA, 2015. * _[PERSON] et al. (2019)_ [PERSON]; [PERSON]; [PERSON]; [PERSON] Real-time carrier phase multipath detection based on dual-frequency C/N0 data. _GPS Solut._**2019**, _23_, 1-13. [CrossRef]
* _[PERSON] et al. (2016)_ [PERSON]; [PERSON]; [PERSON]; [PERSON] A new method for specular and diffuse pseudorange multipath error extraction using wavelet analysis. _GPS Solut._**2016**, _20_, 499-508. [CrossRef]
* _[PERSON] et al.