For classical TCAR(three carrier ambiguity resolution)algorithm is affected by ionospheric delay and measurement noise,it is difficult to reliably fix ambiguity at medium and long baselines.An improved TCAR algorithm ...For classical TCAR(three carrier ambiguity resolution)algorithm is affected by ionospheric delay and measurement noise,it is difficult to reliably fix ambiguity at medium and long baselines.An improved TCAR algorithm which takes the influence of ionospheric delay into account and has good adaptive robustness is proposed.On the basis of the non-geometric TCAR model,ionospheric delay is obtained by linearly combining extra-wide-lane with fixed ambiguity,and then wide-lane ambiguity is solved.Solving narrow-lane ambiguity by adaptive robust filtering by constructing optimal combination observation,which can effectively improve the fixed success rate of narrow-lane ambiguity and reduce the adverse effects of gross error.Experimental results show that the improved TCAR algorithm can guarantee a high fixed correct rate of wide-lane ambiguity,effectively improve fixed success rate of narrow-lane ambiguity,and has a good ability to resist gross error.展开更多
Indoor and underground space positioning and navigation systems are important infrastructure for urban lifeline construction.With the development of 5G communication technology,artificial intelligence,intelligent cons...Indoor and underground space positioning and navigation systems are important infrastructure for urban lifeline construction.With the development of 5G communication technology,artificial intelligence,intelligent construction,and other technologies,autonomous mobile terminals have become the main application subjects,and the requirements for accuracy and ubiquity of indoor positioning technology are also increasing.Two main indoor positioning technologies,sensor based and RF signal based are introduced,basic concepts of new visible light communication positioning technology are discussed,and in-depth results on non-imaging and imaging positioning methods are presented in this article.We propose a pose-assisted imaging positioning method applied in the 11 m×8 m×3.5 m room,which is based on visible light communication.This test shows that this method can achieve the positioning results with a plane positioning error less than 5 cm and the height error less than 6 cm by using low-cost sensors.Visible light positioning technology provides a cost-effective and convenient new solution for indoor positioning,simultaneously solving the integration problem of communication and positioning.It can provide positioning technology supporting the construction of urban lifelines in enclosed spaces.展开更多
文摘For classical TCAR(three carrier ambiguity resolution)algorithm is affected by ionospheric delay and measurement noise,it is difficult to reliably fix ambiguity at medium and long baselines.An improved TCAR algorithm which takes the influence of ionospheric delay into account and has good adaptive robustness is proposed.On the basis of the non-geometric TCAR model,ionospheric delay is obtained by linearly combining extra-wide-lane with fixed ambiguity,and then wide-lane ambiguity is solved.Solving narrow-lane ambiguity by adaptive robust filtering by constructing optimal combination observation,which can effectively improve the fixed success rate of narrow-lane ambiguity and reduce the adverse effects of gross error.Experimental results show that the improved TCAR algorithm can guarantee a high fixed correct rate of wide-lane ambiguity,effectively improve fixed success rate of narrow-lane ambiguity,and has a good ability to resist gross error.
基金support by the National Natural Science Foundation of china(41501491)State Key Laboratory of Geo-Information Engineering(SKLGIE2020-Z-2-1)Key Technologies Research and Development Program(2022YFB2602200).
文摘Indoor and underground space positioning and navigation systems are important infrastructure for urban lifeline construction.With the development of 5G communication technology,artificial intelligence,intelligent construction,and other technologies,autonomous mobile terminals have become the main application subjects,and the requirements for accuracy and ubiquity of indoor positioning technology are also increasing.Two main indoor positioning technologies,sensor based and RF signal based are introduced,basic concepts of new visible light communication positioning technology are discussed,and in-depth results on non-imaging and imaging positioning methods are presented in this article.We propose a pose-assisted imaging positioning method applied in the 11 m×8 m×3.5 m room,which is based on visible light communication.This test shows that this method can achieve the positioning results with a plane positioning error less than 5 cm and the height error less than 6 cm by using low-cost sensors.Visible light positioning technology provides a cost-effective and convenient new solution for indoor positioning,simultaneously solving the integration problem of communication and positioning.It can provide positioning technology supporting the construction of urban lifelines in enclosed spaces.
