Horizon nulling helix antennas for GPS timing
| Autor: | Drayton L. Hanna, Steven R. Best, Erik T. Lundberg, Ian T. McMichael |
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| Rok vydání: | 2017 |
| Předmět: |
Beam diameter
Engineering Null (radio) Directional antenna business.industry 020208 electrical & electronic engineering 020206 networking & telecommunications 02 engineering and technology Topology Interference (wave propagation) Optics Helix 0202 electrical engineering electronic engineering information engineering Global Positioning System Helical antenna Antenna (radio) business Computer Science::Information Theory |
| Zdroj: | 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. |
| DOI: | 10.1109/apusncursinrsm.2017.8073290 |
| Popis: | Global Positioning System (GPS) antennas installed at fixed site infrastructure are susceptible to interference incident along the direction of the horizon. In this paper, a series of quadrifilar helical antennas are presented for the application of GPS timing. The first antenna employs a novel method of reactive loading along the length of the multi-turn helix. The phase distribution along the helix creates a deep null in the gain pattern at the horizon while maintaining sufficient beam width in the zenith direction. The horizon null minimizes ground based interference. The second antenna achieves similar performance by varying the pitch of the helix arms along the length of the antenna. The third antenna operates over L1 and L2 frequencies using concentric helices. A novel method is presented to decouple the concentric helices based on distributed trap circuits along the length of the helix arms, which preserves the horizon nulling patterns at both frequencies. The proposed antennas offer improved performance over previous horizon-nulling designs. Additionally, the proposed antennas can be manufactured at a lower cost compared to other interference mitigating antennas based on the simple architecture. |
| Databáze: | OpenAIRE |
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