The Impact of Different Sampling Rates of On-Board Cold Atom Interferometry Gradiometer on the Gravity Field Solution Accuracy.
Saved in:
| Title: | The Impact of Different Sampling Rates of On-Board Cold Atom Interferometry Gradiometer on the Gravity Field Solution Accuracy. |
|---|---|
| Authors: | Niu, Benben1 (AUTHOR), Mu, Qinglu1 (AUTHOR) muqinglu@jou.edu.cn, Yin, Zhi1 (AUTHOR), Wang, Jigang1 (AUTHOR), Cheng, Zerui1 (AUTHOR), Wang, Yutong1 (AUTHOR) |
| Source: | Remote Sensing. Jun2026, Vol. 18 Issue 12, p1944. 19p. |
| Subjects: | Signal sampling, Gravimeters (Geophysical instruments), Noise measurement, Gravity anomalies, Artificial satellite attitude control systems |
| Abstract: | Highlights: What are the main findings? At a noise level of 5 mE / Hz , the Vzz component in nadir pointing mode and its involved dual-axis (Vxx + Vzz or Vyy + Vzz) and tri-axis observations are the highest-accuracy configurations, but they outperform GOCE across the full frequency band only at a sampling interval of 1 s. At a noise level of 0.1 mE / Hz , all tested sampling rates (1 s to 12 s) yield gravity field recovery accuracy superior to GOCE, with accuracy continuously improving as the sampling rate increases. When the instrument reaches its limiting precision, residual centrifugal force errors caused by uncertainties in attitude and angular velocity become the dominant error source, shifting the limiting factor from sensor noise to satellite platform stability. What are the implications of the main findings? These results provide a quantitative reference for selecting axis configurations (single-axis, dual-axis, or tri-axis) under different pointing modes for future spaceborne quantum gravity missions. This study reveals the significant impact of sampling rate on gravity field recovery accuracy, highlighting the need to balance measurement cycle design and sensor sensitivity in next-generation mission planning. The development of cold atom interferometry (CAI) provides new opportunities for next-generation satellite gravity gradiometry missions. Compared with the electrostatic gradiometer onboard the GOCE satellite, CAI gradiometers exhibit white noise characteristics within the effective measurement bandwidth, enabling improved performance in the low-frequency range (<5 m E / H z ). However, the measurement cycle, including atom preparation, cooling, and laser interferometry, leads to a relatively longer sampling rate, which may limit observation performance. In this study, the impact of sampling rate on the performance of a spaceborne CAI gradiometer is systematically investigated. Closed-loop simulations were performed under different observation configurations, noise levels, and sampling rates. The results are evaluated in terms of static gravity field recovery accuracy and compared with those from the GOCE mission. The results indicate that, for single-axis observations, the V zz component in nadir pointing mode achieves the highest accuracy at the 5 m E / H z noise level, while at 0.1 m E / H z and a 1 s sampling interval, the accuracy improves by one order of magnitude compared to GOCE. For dual-axis observations, the combinations V xx + V zz and V yy + V zz in nadir pointing mode provide the best performance at 5 m E / H z , and an improvement of up to one order of magnitude is achieved at 0.1 m E / H z with a 1 s sampling interval. For tri-axis observations, both pointing modes outperform GOCE across the full frequency band only at a 1 s sampling interval under 5 m E / H z noise. At 0.1 m E / H z , all sampling configurations yield better results than GOCE, with the highest accuracy achieved in nadir pointing mode. These findings demonstrate the critical role of sampling rate in CAI-based gravity field recovery and provide useful guidance for the design of future spaceborne quantum gravity missions. [ABSTRACT FROM AUTHOR] |
| Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | Highlights: What are the main findings? At a noise level of 5 mE / Hz , the Vzz component in nadir pointing mode and its involved dual-axis (Vxx + Vzz or Vyy + Vzz) and tri-axis observations are the highest-accuracy configurations, but they outperform GOCE across the full frequency band only at a sampling interval of 1 s. At a noise level of 0.1 mE / Hz , all tested sampling rates (1 s to 12 s) yield gravity field recovery accuracy superior to GOCE, with accuracy continuously improving as the sampling rate increases. When the instrument reaches its limiting precision, residual centrifugal force errors caused by uncertainties in attitude and angular velocity become the dominant error source, shifting the limiting factor from sensor noise to satellite platform stability. What are the implications of the main findings? These results provide a quantitative reference for selecting axis configurations (single-axis, dual-axis, or tri-axis) under different pointing modes for future spaceborne quantum gravity missions. This study reveals the significant impact of sampling rate on gravity field recovery accuracy, highlighting the need to balance measurement cycle design and sensor sensitivity in next-generation mission planning. The development of cold atom interferometry (CAI) provides new opportunities for next-generation satellite gravity gradiometry missions. Compared with the electrostatic gradiometer onboard the GOCE satellite, CAI gradiometers exhibit white noise characteristics within the effective measurement bandwidth, enabling improved performance in the low-frequency range (<5 m E / H z ). However, the measurement cycle, including atom preparation, cooling, and laser interferometry, leads to a relatively longer sampling rate, which may limit observation performance. In this study, the impact of sampling rate on the performance of a spaceborne CAI gradiometer is systematically investigated. Closed-loop simulations were performed under different observation configurations, noise levels, and sampling rates. The results are evaluated in terms of static gravity field recovery accuracy and compared with those from the GOCE mission. The results indicate that, for single-axis observations, the V zz component in nadir pointing mode achieves the highest accuracy at the 5 m E / H z noise level, while at 0.1 m E / H z and a 1 s sampling interval, the accuracy improves by one order of magnitude compared to GOCE. For dual-axis observations, the combinations V xx + V zz and V yy + V zz in nadir pointing mode provide the best performance at 5 m E / H z , and an improvement of up to one order of magnitude is achieved at 0.1 m E / H z with a 1 s sampling interval. For tri-axis observations, both pointing modes outperform GOCE across the full frequency band only at a 1 s sampling interval under 5 m E / H z noise. At 0.1 m E / H z , all sampling configurations yield better results than GOCE, with the highest accuracy achieved in nadir pointing mode. These findings demonstrate the critical role of sampling rate in CAI-based gravity field recovery and provide useful guidance for the design of future spaceborne quantum gravity missions. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 20724292 |
| DOI: | 10.3390/rs18121944 |
