Pseudorange differential positioning algorithm for smartphones considering DISB
In order to enhance the positioning accuracy and reliability of smart phones in the occluded environment,a combined inter-system tightly combined pseudorange differential positioning model of the global positioning system (GPS),Galileo satellite navigation system (Galileo),and BeiDou navigation satellite system (BDS),as well as a random model with height angle additional uncertainty suitable for smart phones,was provided. Firstly,the size and stability of the inter-system bias of the pseudorange differential between the L1/B1I and L1/E1 frequencies were evaluated,and the results showed that the inter-system bias of the smart phone pseudorange differential system could maintain stability. By using the Xiaomi 8 and Huawei P40 smart phones and actually measuring the same and different types of receivers for comparative verification,the occluded environment by setting the cutoff altitude angle was simulated. The experimental results showed that:in the case of simulating the occluded environment with a 45° cutoff altitude angle and applying the tightly combined pseudorange differential correction model,the plane positioning accuracy of the Xiaomi 8 and Huawei P40 smart phones had been increased by 25.5％ and 32.4％,respectively. This method could improve the positioning accuracy and reliability of smart phones in the occluded environment.
smartphoneglobal navigation satellite system (GNSS)pseudorange differentialdifferential inter-system bias (DISB)tightly coupled
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