Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments
This paper designs a cascading vector tracking loop based on the Unscented Kalman Filter (UKF) for high dynamic environment. Constant improvement in dynamic performance is an enormous challenge to the traditional receiver. Due to the doppler effect, the satellite signals received by these vehicles c...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/10/2000 |
| _version_ | 1797533444704567296 |
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| author | Zhiyong Tu Yidong Lou Wenfei Guo Weiwei Song Yusheng Wang |
| author_facet | Zhiyong Tu Yidong Lou Wenfei Guo Weiwei Song Yusheng Wang |
| author_sort | Zhiyong Tu |
| collection | DOAJ |
| description | This paper designs a cascading vector tracking loop based on the Unscented Kalman Filter (UKF) for high dynamic environment. Constant improvement in dynamic performance is an enormous challenge to the traditional receiver. Due to the doppler effect, the satellite signals received by these vehicles contain fast changing doppler frequency shifts and the first and second derivatives of doppler frequency, which will directly cause a negative impact on the receiver’s stable tracking of the signals. In order to guarantee the dynamic performance and the tracking accuracy, this paper designs a vector carrier structure to estimate the doppler component of a signal. Firstly, after the coherence integral, the IQ values are reorganized into new observations. Secondly, the phase error and frequency of the carrier are estimated through the pre-filter. Then, the pseudorange and carrier frequency are used as the observations of the main filter to estimate the motion state of the aircraft. Finally, the current state is fed back to the carrier Numerical Controlled Oscillator (NCO) as a complete closed loop. In the whole structure, the cascading vector loop replaces the original carrier tracking loop, and the stable signal tracking of code loop is guaranteed by carrier assisted pseudo-code method. In this paper, with the high dynamic signals generated by the GNSS signal simulator, this designed algorithm is validated by a software receiver. The results show that this loop has a wider dynamic tracking range and lower tracking error than the second-order frequency locked loop assisted third-order phase locked loop in high dynamic circumstances. When the acceleration of carrier is 100 g, the convergence time of vector structure is about 100 ms, and the carrier phase error is lower than 0.6 mm. |
| first_indexed | 2024-03-10T11:14:37Z |
| format | Article |
| id | doaj.art-dad6e7cc7fc040f6b449bc2ca9329158 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T11:14:37Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-dad6e7cc7fc040f6b449bc2ca93291582023-11-21T20:32:33ZengMDPI AGRemote Sensing2072-42922021-05-011310200010.3390/rs13102000Design and Validation of a Cascading Vector Tracking Loop in High Dynamic EnvironmentsZhiyong Tu0Yidong Lou1Wenfei Guo2Weiwei Song3Yusheng Wang4GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, ChinaGNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, ChinaGNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, ChinaGNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, ChinaGNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, ChinaThis paper designs a cascading vector tracking loop based on the Unscented Kalman Filter (UKF) for high dynamic environment. Constant improvement in dynamic performance is an enormous challenge to the traditional receiver. Due to the doppler effect, the satellite signals received by these vehicles contain fast changing doppler frequency shifts and the first and second derivatives of doppler frequency, which will directly cause a negative impact on the receiver’s stable tracking of the signals. In order to guarantee the dynamic performance and the tracking accuracy, this paper designs a vector carrier structure to estimate the doppler component of a signal. Firstly, after the coherence integral, the IQ values are reorganized into new observations. Secondly, the phase error and frequency of the carrier are estimated through the pre-filter. Then, the pseudorange and carrier frequency are used as the observations of the main filter to estimate the motion state of the aircraft. Finally, the current state is fed back to the carrier Numerical Controlled Oscillator (NCO) as a complete closed loop. In the whole structure, the cascading vector loop replaces the original carrier tracking loop, and the stable signal tracking of code loop is guaranteed by carrier assisted pseudo-code method. In this paper, with the high dynamic signals generated by the GNSS signal simulator, this designed algorithm is validated by a software receiver. The results show that this loop has a wider dynamic tracking range and lower tracking error than the second-order frequency locked loop assisted third-order phase locked loop in high dynamic circumstances. When the acceleration of carrier is 100 g, the convergence time of vector structure is about 100 ms, and the carrier phase error is lower than 0.6 mm.https://www.mdpi.com/2072-4292/13/10/2000cascading vector trackingprefilterhigh dynamic signalsoftware receiverfeedback loop |
| spellingShingle | Zhiyong Tu Yidong Lou Wenfei Guo Weiwei Song Yusheng Wang Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments Remote Sensing cascading vector tracking prefilter high dynamic signal software receiver feedback loop |
| title | Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments |
| title_full | Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments |
| title_fullStr | Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments |
| title_full_unstemmed | Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments |
| title_short | Design and Validation of a Cascading Vector Tracking Loop in High Dynamic Environments |
| title_sort | design and validation of a cascading vector tracking loop in high dynamic environments |
| topic | cascading vector tracking prefilter high dynamic signal software receiver feedback loop |
| url | https://www.mdpi.com/2072-4292/13/10/2000 |
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