Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp
The shortwave time service system is a vital land-based wireless time service solution, serving as a supplement and backup to the global navigation satellite system. It ensures that time users can access reliable timings, especially in extreme situations. However, the current BPM shortwave time serv...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-10-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/16/21/4035 |
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| author | Jiangbin Yuan Shifeng Li Wenhe Yan Yuhang Song Chaozhong Yang Zhaopeng Hu Dafeng Yang Yu Hua |
| author_facet | Jiangbin Yuan Shifeng Li Wenhe Yan Yuhang Song Chaozhong Yang Zhaopeng Hu Dafeng Yang Yu Hua |
| author_sort | Jiangbin Yuan |
| collection | DOAJ |
| description | The shortwave time service system is a vital land-based wireless time service solution, serving as a supplement and backup to the global navigation satellite system. It ensures that time users can access reliable timings, especially in extreme situations. However, the current BPM shortwave time service signal in China faces issues such as insufficient anti-interference reception capabilities and poor timing accuracy. This paper capitalizes on the advantages of Chirp signals and explores a new modulation technology for BPM shortwave time signals that is compatible with the existing modulation system. A Dual Chirp Time-Division Combined Modulation (DCTDCM) scheme is proposed for broadcasting two time signals: Coordinated Universal Time (UTC) and Universal Time 1 (UT1). Furthermore, an in-depth study of the receiving method for this scheme is conducted, with detailed design of its parameters. The designed DCTDCM signals offer a spread spectrum gain of 24 dB and a multipath resolution capability of at least 125 μs, significantly enhancing the anti-interference reception and anti-multipath attenuation capabilities of shortwave time signals. As a result, the availability and timing accuracy of shortwave time signals are substantially improved. Finally, extensive comparative experiments on reception performance validate the effectiveness of this approach. |
| format | Article |
| id | doaj-art-e9e7092d48a64aebaedfff5ae7abf4ef |
| institution | DOAJ |
| issn | 2072-4292 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-e9e7092d48a64aebaedfff5ae7abf4ef2025-08-20T02:49:49ZengMDPI AGRemote Sensing2072-42922024-10-011621403510.3390/rs16214035Research and Design of BPM Shortwave Time Signal Modulation Technology Based on ChirpJiangbin Yuan0Shifeng Li1Wenhe Yan2Yuhang Song3Chaozhong Yang4Zhaopeng Hu5Dafeng Yang6Yu Hua7National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaNational Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaNational Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaTianjin Navigation Instrument Research Institute, Tianjin 300131, ChinaNational Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaNational Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaXi’an Air-Space Electronic Technology Co., Ltd., Xi’an 710061, ChinaNational Time Service Center, Chinese Academy of Sciences, Xi’an 710600, ChinaThe shortwave time service system is a vital land-based wireless time service solution, serving as a supplement and backup to the global navigation satellite system. It ensures that time users can access reliable timings, especially in extreme situations. However, the current BPM shortwave time service signal in China faces issues such as insufficient anti-interference reception capabilities and poor timing accuracy. This paper capitalizes on the advantages of Chirp signals and explores a new modulation technology for BPM shortwave time signals that is compatible with the existing modulation system. A Dual Chirp Time-Division Combined Modulation (DCTDCM) scheme is proposed for broadcasting two time signals: Coordinated Universal Time (UTC) and Universal Time 1 (UT1). Furthermore, an in-depth study of the receiving method for this scheme is conducted, with detailed design of its parameters. The designed DCTDCM signals offer a spread spectrum gain of 24 dB and a multipath resolution capability of at least 125 μs, significantly enhancing the anti-interference reception and anti-multipath attenuation capabilities of shortwave time signals. As a result, the availability and timing accuracy of shortwave time signals are substantially improved. Finally, extensive comparative experiments on reception performance validate the effectiveness of this approach.https://www.mdpi.com/2072-4292/16/21/4035shortwave time serviceBPMtime signalsmodulationchirp signal |
| spellingShingle | Jiangbin Yuan Shifeng Li Wenhe Yan Yuhang Song Chaozhong Yang Zhaopeng Hu Dafeng Yang Yu Hua Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp Remote Sensing shortwave time service BPM time signals modulation chirp signal |
| title | Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp |
| title_full | Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp |
| title_fullStr | Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp |
| title_full_unstemmed | Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp |
| title_short | Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp |
| title_sort | research and design of bpm shortwave time signal modulation technology based on chirp |
| topic | shortwave time service BPM time signals modulation chirp signal |
| url | https://www.mdpi.com/2072-4292/16/21/4035 |
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