Non-ideality Characteristic Analysis and Receiver Design Constraints Recommendation for BDS B1C and B2a Signals
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摘要: 卫星导航信号的非理想性会导致不同接收机之间出现测距偏差，是影响卫星导航系统服务精度和完好性的重要因素。首先，针对北斗系统B1C、B2a新体制信号的非理想性进行分析，利用大口径天线采集了全部北斗三号在轨卫星播发的B1C、B2a信号（共27颗卫星），评估了不同接收带宽、码鉴相间距下测距偏差的大小与变化特点；然后，以双频多星座星基增强服务应用为例，分析了两个信号在相应接收机中的设计约束条件。研究结果发现，在接收机常用的参数范围内，B1C、B2a信号非理想性引入的测距偏差分别不超过0.68 m、0.44 m；在测距偏差小于0.1 m的性能约束下，B1C、B2a信号可用的约束条件参数范围优于国际民航标准草案中的相关要求。Abstract:Objectives Non-ideality of navigation satellite signals can cause ranging bias between different receivers, which is an important factor that may degrade the accuracy and integrity performance of global navigation satellite system. In civil aviation and other high integrity services, it is necessary to consider the non-ideality characteristics of the signal and define the design constraints of the user receiver, so as to reduce the impact of non-ideality and ensure service safety.Methods The B1C and B2a signals of BeiDou satellite navigation system (BDS) are planned to join the international civil aviation standard, so it is necessary to study their non-ideality characteristics and define the receiver design constraints. This paper analyzed the non-ideality characteristic of BDS B1C and B2a signals. In order to avoid the influence of noise and multipath, a large aperture antenna was used to collected all the in-orbit satellite broadcasting B1C and B2a signals (including 27 satellites) to obtain pure signal samples. Then, the software receiver was used to process the signal samples under various receiving parameters to obtain the ranging biases under different receiver front-end bandwidth and code discriminator space, and the ranging bias range and variation with the receiving parameters are evaluated. Furthermore, taking the application in dual frequency multi-constellation satellite based augmentation service as an example, the receiver design constraints of the two signals were analyzed.Results and Conclusions The experimental results show that the range biases introduced by the non-ideality of B1C and B2a signals are less than 0.68 m and 0.44 m, respectively, under the parameters range commonly used by receivers. Under the requirement of range bias less than 0.1 m, the applicable parameter range of receiver design constraints for B1C and B2a signals is better than the relevant requirements of the international civil aviation organization draft standard. There is sufficient margin to further consider other constraints.
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Keywords:
- B1C signal /
- B2a signal /
- non-ideality /
- ranging bias /
- receiver design constraints
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图 1 24 MHz带宽下B1C信号测距偏差与鉴相间距关系
Figure 1. B1C Ranging Bias Under Various Correlation Spaces with 24 MHz Bandwidth
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图 2 B1C信号测距偏差与信号带宽和鉴相间距关系
Figure 2. B1C Ranging Bias Under Various Signal Bandwidths and Correlation Spaces
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图 3 24 MHz滤波带宽下B2a信号测距偏差与鉴相间距关系
Figure 3. B2a Ranging Bias Under Various Correlation Spaces with 24 MHz Bandwidth
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图 4 B2a信号测距偏差与信号带宽和鉴相间距关系
Figure 4. B2a Ranging Bias Under Various Signal Bandwidths and Correlation Spaces
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