卫星导航信号畸变模型威胁空间描述了能够引起较大差分误差但难以通过接收机观测量检测发现的信号畸变范围，其对于民航等涉及生命安全的导航服务可能造成灾难性后果。威胁空间越大，导航服务潜在风险越高，对畸变检测手段要求也越高。卫星导航系统应采取合适的方法尽量减小威胁空间。该文提出了降低测距偏差检测门限的方法来实现威胁空间的减小，并以北斗B1C、B2a信号为例评估了效果。结果显示，在测距偏差检测门限5 m的条件下，相比门限20 m的条件，威胁空间可减小40%以上。该文进一步给出了在导航卫星中搭载星载接收机来实现该方法的工程建议方案。
Abstract
The threat space of a satellite navigation signal distortion model describes the signal distortion range which causes a large differential error but is difficult to detect by receiver observations. The threat space may have disastrous consequences for civil aviation and other safety navigation services. A larger threat space increases the navigation services risk and the distortion detection requirements. Thus, satellite navigation systems need appropriate methods to minimize the threat space. This paper presents a method that reduces the range bias detection threshold to reduce the threat space. The effectiveness of this method is evaluated using the BeiDou Navigation Satellite System (BDS) B1C and B2a signals as examples. The results show that the threat space can be reduced by more than 40% compared to a space for a 20 m threshold when the ranging bias threshold is 5 m. This method should be implemented by using satellite onboard receivers to reduce the threat space.
关键词
畸变模型 /
威胁空间减小 /
测距偏差检测门限 /
星载接收机
Key words
distortion model /
threat space reduction /
ranging bias detection threshold /
satellite onboard receiver
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参考文献
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