Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075135
Bin Wang, Junping Chen
Atomic clocks onboard satellites are of importance for Global Navigation Satellite Systems (GNSS). Frequency jumps are common in rubidium atomic frequency standard (RAFS). Real-time detection and correction of these jumps are of vital importance due to the direct impact on the GNSS positioning, navigation and timing (PNT) performance. The latest BDS C13 satellite is an IGSO satellite in replacement of the old MEO. This paper preliminarily analyzes the characteristics of BDS C13 onboard satellite clocks using the methods of block averaging (BLKAVG), sequential averaging (SEQAVG), cumulative sum (CUMSUM). Results show that C13 satellite clock underwent several frequency jumps and a clock switch during the investigated period.
{"title":"Preliminary analysis of frequency jumps in BDS satellite clock","authors":"Bin Wang, Junping Chen","doi":"10.1109/CPGPS.2017.8075135","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075135","url":null,"abstract":"Atomic clocks onboard satellites are of importance for Global Navigation Satellite Systems (GNSS). Frequency jumps are common in rubidium atomic frequency standard (RAFS). Real-time detection and correction of these jumps are of vital importance due to the direct impact on the GNSS positioning, navigation and timing (PNT) performance. The latest BDS C13 satellite is an IGSO satellite in replacement of the old MEO. This paper preliminarily analyzes the characteristics of BDS C13 onboard satellite clocks using the methods of block averaging (BLKAVG), sequential averaging (SEQAVG), cumulative sum (CUMSUM). Results show that C13 satellite clock underwent several frequency jumps and a clock switch during the investigated period.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127109522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075089
Z. Minghui, Wang Qiuying, Guo Zheng
Sail for a long time in the sea, and the inertial navigation system error accumulating with time affect navigation accuracy seriously, meanwhile the star sensor can output the high precision information. So inertial navigation / Star integrated navigation technology is applied to solve this problem. Through the strap-down inertial navigation system and the star sensor, the position information of the ship is calculated during the navigation process, and the difference of the position information is taken as the observation quantity. Then, the Kalman filter is used to fuse the data information, so as to estimate effectively the integrated navigation system error terms. The purpose is to modify the navigation information of the inertial navigation system. Through the system simulation, it can be seen that this combination navigation method can effectively suppress the divergence of the inertial navigation system error and improve the navigation accuracy when navigating the ship.
{"title":"Research on integrated navigation of strap-down inertial navigation system and star sensor","authors":"Z. Minghui, Wang Qiuying, Guo Zheng","doi":"10.1109/CPGPS.2017.8075089","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075089","url":null,"abstract":"Sail for a long time in the sea, and the inertial navigation system error accumulating with time affect navigation accuracy seriously, meanwhile the star sensor can output the high precision information. So inertial navigation / Star integrated navigation technology is applied to solve this problem. Through the strap-down inertial navigation system and the star sensor, the position information of the ship is calculated during the navigation process, and the difference of the position information is taken as the observation quantity. Then, the Kalman filter is used to fuse the data information, so as to estimate effectively the integrated navigation system error terms. The purpose is to modify the navigation information of the inertial navigation system. Through the system simulation, it can be seen that this combination navigation method can effectively suppress the divergence of the inertial navigation system error and improve the navigation accuracy when navigating the ship.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130050796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075142
H. Qiang, Yi Hongliang, Xu Ding-jie, Zhao Bo
Indoor Global Positioning System (IGPS) is one of the most commonly used methods for indoor high-precision positioning. In order to improve the accuracy of IGPS essentially, this paper studies the device error and its influence on positioning accuracy through introducing the intermediate variable named scanning angle error. The relationship between positioning accuracy, device error and scanning angle error is derived respectively, and then this paper establishes the optimal relation formula of positioning accuracy and scanning angle error, analyzes the influence of device error on scanning angle error by modeling and simulating. Based on these, this paper proposes the improvement method of positioning accuracy from the view of device design to providing support for IGPS design.
{"title":"Research on the IGPS device error and its influence of positioning accuracy","authors":"H. Qiang, Yi Hongliang, Xu Ding-jie, Zhao Bo","doi":"10.1109/CPGPS.2017.8075142","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075142","url":null,"abstract":"Indoor Global Positioning System (IGPS) is one of the most commonly used methods for indoor high-precision positioning. In order to improve the accuracy of IGPS essentially, this paper studies the device error and its influence on positioning accuracy through introducing the intermediate variable named scanning angle error. The relationship between positioning accuracy, device error and scanning angle error is derived respectively, and then this paper establishes the optimal relation formula of positioning accuracy and scanning angle error, analyzes the influence of device error on scanning angle error by modeling and simulating. Based on these, this paper proposes the improvement method of positioning accuracy from the view of device design to providing support for IGPS design.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134333047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075124
Xingyu Chen, Jiang Guo, J. Geng, Chenghong Li
Precise satellite clock corrections are extremely important to Precise Point Positioning (PPP) applications using Global Navigation Satellite System (GNSS), especially for applications in geosciences. The high-rate GPS clock corrections are required in the applications of geosciences with a high sampling rate (up to 5Hz). Therefore, the high-rate precise clock corrections of achieving high accuracy positioning resolution are in demand. Normally, the undifferenced phase and range observations are utilized to estimate satellite clock corrections with a global network. However, the processing is time-consuming and cumbersome due to a large number of parameters. For example, ambiguities are estimated together with clock corrections parameters. To achieve a trade-off between the high accuracy and the efficiency, the quality of linearly interpolated GPS clock corrections with different sample rates demands further investigation. We assessed the performance of the linearly interpolated GPS clock corrections with different sample rates and applied them into positioning. The results show that the difference of the positioning accuracy is below 1% for 2s, 5s, and 10s clock corrections and a slightly larger for 15s clock corrections, around 2%. However, the positioning accuracy can be improved by about 13% using the 1s sampling rate by comparing with the 30 s sampling rate.
{"title":"Performance of linearly interpolated GPS clock corrections","authors":"Xingyu Chen, Jiang Guo, J. Geng, Chenghong Li","doi":"10.1109/CPGPS.2017.8075124","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075124","url":null,"abstract":"Precise satellite clock corrections are extremely important to Precise Point Positioning (PPP) applications using Global Navigation Satellite System (GNSS), especially for applications in geosciences. The high-rate GPS clock corrections are required in the applications of geosciences with a high sampling rate (up to 5Hz). Therefore, the high-rate precise clock corrections of achieving high accuracy positioning resolution are in demand. Normally, the undifferenced phase and range observations are utilized to estimate satellite clock corrections with a global network. However, the processing is time-consuming and cumbersome due to a large number of parameters. For example, ambiguities are estimated together with clock corrections parameters. To achieve a trade-off between the high accuracy and the efficiency, the quality of linearly interpolated GPS clock corrections with different sample rates demands further investigation. We assessed the performance of the linearly interpolated GPS clock corrections with different sample rates and applied them into positioning. The results show that the difference of the positioning accuracy is below 1% for 2s, 5s, and 10s clock corrections and a slightly larger for 15s clock corrections, around 2%. However, the positioning accuracy can be improved by about 13% using the 1s sampling rate by comparing with the 30 s sampling rate.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122523582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075146
Hui Wang, Lili Guo
To improve the recognition rate of signal modulation recognition methods under the low Signal-to-noise ratio (SNR), a modulation recognition method is proposed. In this paper, we study an automatic modulation recognition through the Artificial Neural Network (ANN). Implement and design 7 digital modulations are: 2FSK, 4FSK, 8FSK, BPSK, QPSK, MSK and 2ASK. The cyclic spectrum after reducing dimension via Principle Component Analysis (PCA) is chosen as key feature for digital modulation recognizer based on the ANN. We corrupted the signals by additive White Gaussian Noise (AWGN) for testing the algorithm. The simulation results show that the ANN could classify the signals in its current state of development.
{"title":"A new method of automatic modulation recognition based on dimension reduction","authors":"Hui Wang, Lili Guo","doi":"10.1109/CPGPS.2017.8075146","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075146","url":null,"abstract":"To improve the recognition rate of signal modulation recognition methods under the low Signal-to-noise ratio (SNR), a modulation recognition method is proposed. In this paper, we study an automatic modulation recognition through the Artificial Neural Network (ANN). Implement and design 7 digital modulations are: 2FSK, 4FSK, 8FSK, BPSK, QPSK, MSK and 2ASK. The cyclic spectrum after reducing dimension via Principle Component Analysis (PCA) is chosen as key feature for digital modulation recognizer based on the ANN. We corrupted the signals by additive White Gaussian Noise (AWGN) for testing the algorithm. The simulation results show that the ANN could classify the signals in its current state of development.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127361122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075119
Tong Liu, Guochang Xu, Wenlin Yan, Tianhe Xu
This paper proposed an automatic method to detect and compensate the broken GCPs at the application of Direct Geo-referencing. Initial exterior parameters were from the aiding of GNSS/IMU integration through a 15-state Kalman Filter, the detecting method is based on Aerial Triangulation and an enumerating way. The correction of broken GCPs is calculated by forward intersection. Six aerial images taken from a town at Portugal and simulated broken GCPs were used to validate this method. The results show that this detecting method of the broken GCPs at the application of Direct Geo-referencing has a positive effect: the error caused by the broken GCPs can be decreased significantly.
{"title":"A detecting and compensation method for the errors from broken ground control points at the application of Direct Geo-referencing","authors":"Tong Liu, Guochang Xu, Wenlin Yan, Tianhe Xu","doi":"10.1109/CPGPS.2017.8075119","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075119","url":null,"abstract":"This paper proposed an automatic method to detect and compensate the broken GCPs at the application of Direct Geo-referencing. Initial exterior parameters were from the aiding of GNSS/IMU integration through a 15-state Kalman Filter, the detecting method is based on Aerial Triangulation and an enumerating way. The correction of broken GCPs is calculated by forward intersection. Six aerial images taken from a town at Portugal and simulated broken GCPs were used to validate this method. The results show that this detecting method of the broken GCPs at the application of Direct Geo-referencing has a positive effect: the error caused by the broken GCPs can be decreased significantly.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124498526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/CPGPS.2017.8075123
Ying Hao, Xiaolin Meng
For most of the external atmosphere flight, ballistic target trajectory has special characteristics like long-time and long-range. In this paper, the ellipsoidal earth model is taken into consideration for discussing the problem of two-dimensional engagement between the target and the interceptor, where atmosphere effect is neglected. By the presentation methods of operational area and launch area denied, formulae are deduced and simulations results are shown. Comparison is made with the one which has condition of round earth model.
{"title":"Ballistic target interception simulation and analysis based on ellipsoidal earth model","authors":"Ying Hao, Xiaolin Meng","doi":"10.1109/CPGPS.2017.8075123","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075123","url":null,"abstract":"For most of the external atmosphere flight, ballistic target trajectory has special characteristics like long-time and long-range. In this paper, the ellipsoidal earth model is taken into consideration for discussing the problem of two-dimensional engagement between the target and the interceptor, where atmosphere effect is neglected. By the presentation methods of operational area and launch area denied, formulae are deduced and simulations results are shown. Comparison is made with the one which has condition of round earth model.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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