In this paper, effects on DOP (Dilution of Precision) due to augmentation of Global Positioning System (GPS) with pseudolites are investigated. For this purpose, a typical Local Area Augmentation System (LAAS) scenari...In this paper, effects on DOP (Dilution of Precision) due to augmentation of Global Positioning System (GPS) with pseudolites are investigated. For this purpose, a typical Local Area Augmentation System (LAAS) scenario is consi-dered by placing pseudolites in various positions. It is found that only properly located pseudolites can improve the DOP. DOP values with two pseudolites located on either side of the run way are found to be the best. Geometric DOP (max) was found to be nearly 4 due to only GPS and came down to approximately 2 due to augmentation with two pseudolites. Implementation aspects of Bayes and Kalman filters while estimating DOP values are also examined.展开更多
The global positioning system(GPS) is an extremely mature technique in the navigation and position-ing field.However,there are still some limits in some aspects and for some special applications.Spe-cially,the perform...The global positioning system(GPS) is an extremely mature technique in the navigation and position-ing field.However,there are still some limits in some aspects and for some special applications.Spe-cially,the performance of GPS needs to be improved with technological advances.As a GPS-like ground transmitter,the pseudolite provides a new research direction to achieve high positioning ac-curacy and reliability.In this paper,we describe the core technologies of designing and simulation on the coarse acquisition codes in constructing the pseudolite system.In the GPS/pseudolite integration system,the signal PRN 36 of the pseudolite and the GPS satellites signals are acquired in the modified receiver based on the computer software platform.It is shown that the pseudolite technology is ideally suited to augment the GPS alone and provide greater integrity,availability,and continuity of the navi-gation positioning system,especially for indoor use.展开更多
This article presents an indoor infant monitoring system based on Android system which employs a low-cost Bluetooth Low Energy(BLE)pseudolite to accurately locate the infants in the activity indoors and timely remind ...This article presents an indoor infant monitoring system based on Android system which employs a low-cost Bluetooth Low Energy(BLE)pseudolite to accurately locate the infants in the activity indoors and timely remind the parents.It can achieve a positioning accuracy better than 2 m and effectively reduce the risk of injury to infants and young children.The performance of the proposed system,using false negative rate,false alarm rate,and alarm response time as indicators,is compared with that of the system using Quuppa as a positioning source.The experiment results show that both BLE pseudolite and Quuppa as a positioning source can basically meet the positioning accuracy for the infant monitoring system,but the BLE-pseudolite-based system provides a more cost-efficient solution.展开更多
文摘In this paper, effects on DOP (Dilution of Precision) due to augmentation of Global Positioning System (GPS) with pseudolites are investigated. For this purpose, a typical Local Area Augmentation System (LAAS) scenario is consi-dered by placing pseudolites in various positions. It is found that only properly located pseudolites can improve the DOP. DOP values with two pseudolites located on either side of the run way are found to be the best. Geometric DOP (max) was found to be nearly 4 due to only GPS and came down to approximately 2 due to augmentation with two pseudolites. Implementation aspects of Bayes and Kalman filters while estimating DOP values are also examined.
基金Supported by the Start-up Research Foundation of the Dean Excellent Award of Chinese Academy of Sciences.
文摘The global positioning system(GPS) is an extremely mature technique in the navigation and position-ing field.However,there are still some limits in some aspects and for some special applications.Spe-cially,the performance of GPS needs to be improved with technological advances.As a GPS-like ground transmitter,the pseudolite provides a new research direction to achieve high positioning ac-curacy and reliability.In this paper,we describe the core technologies of designing and simulation on the coarse acquisition codes in constructing the pseudolite system.In the GPS/pseudolite integration system,the signal PRN 36 of the pseudolite and the GPS satellites signals are acquired in the modified receiver based on the computer software platform.It is shown that the pseudolite technology is ideally suited to augment the GPS alone and provide greater integrity,availability,and continuity of the navi-gation positioning system,especially for indoor use.
文摘This article presents an indoor infant monitoring system based on Android system which employs a low-cost Bluetooth Low Energy(BLE)pseudolite to accurately locate the infants in the activity indoors and timely remind the parents.It can achieve a positioning accuracy better than 2 m and effectively reduce the risk of injury to infants and young children.The performance of the proposed system,using false negative rate,false alarm rate,and alarm response time as indicators,is compared with that of the system using Quuppa as a positioning source.The experiment results show that both BLE pseudolite and Quuppa as a positioning source can basically meet the positioning accuracy for the infant monitoring system,but the BLE-pseudolite-based system provides a more cost-efficient solution.
