Innovative calibration methods for strapdown airborne vector gravimetry aboard HALO

HALO 上捷联机载矢量重力测量的创新校准方法

• 批准号: 316740757
• 负责人: Professor Dr.-Ing. Matthias Becker
• 金额: --
• 依托单位: Fachgebiet Physikalische Geodäsie und Satellitengeodäsie (PSG)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316740757?language=en
• 关键词: Innovative; calibration; methods; strapdown; airborne

Strapdown airborne vector gravimetry (SAVG) is the determination of the three-dimensional Earth's gravity field from an aircraft using a strapdown inertial measurement unit (IMU).Compared to the classical stabilized-platform spring gravimeters, which are the predominant instrumentation for airborne gravimetry, SAVG offers several advantages:- Strapdown IMUs yield considerable savings in terms of dimensions, weight, power-consumption, and costs. In addition, no operator is required onboard the aircraft.- SAVG enables the determination of deflections of the vertical (vector gravimetry).- Results from recent SAVG campaigns indicate that SAVG can be more robust against turbulence and during manoeuvres.The Physical and Satellite Geodesy group at the Technische Universität Darmstadt (TUDa) proposes to participate in the ANTHALO-BI campaign (cf. separate mission proposal) in scope of this project, providing the instrumentation and an on-site operator. For the SAVG part, the ANTHALO-BI campaign can be seen as scientific feasibility study for the larger ANTHALO Antarctica campaign (scheduled for 2020/21). For both campaigns, the SAVG experiment of TUDa shall contribute the following:- Scalar gravity measurements at the 1 mGal-level (levelled: 0.5 mGal),- deflections of the vertical (DoV), aiming at 0.5 arc seconds precision, and- high-precision, high-rate attitude and heading outputs (expected precision: 3 and 20 arc seconds, respectively).A crucial part of SAVG is an apropiate modelling of the inertial sensor errors. Recent work at TUDa showed, that offline IMU calibration methods can significantly improve the overall SAVG performance, yielding scalar gravity at the level of 1.0-1.4 mGal for recent SAVG campaigns (0.5-0.6 mGal after applying a cross-over adjustment). This is an excellent performance, reaching the accuracy level of the classical spring gravimeters.A particular challenge for SAVG in view of the ANTHALO-BI and ANTHALO campaigns is the inertial sensor stability over long ranges. Therefore, the main objective of this project is the design and evaluation of novel calibration techniques tailored to long-range SAVG, aiming at a higher long-term stability, and also at a greater robustness in dynamic situations, as during manoeuvres and strong turbulence.For this, extended parametric error models including bias, scale factors, and sensor cross-couplings, each as a function of the sensor temperature will be taken into consideration, as well as sample-based (non-parametric) error models. For the evaluation, existing SAVG data sets, which are or will become available to TUDa will be used in addition to the ANTHALO-BI strapdown data sets.This basic research is expected to be a step towards establishing strapdown airborne gravimetry as the default method for airborne gravimetry in the future.

捷联航空矢量重力测量（SAVG）是利用捷联惯性测量单元（IMU）从飞机上测量地球三维重力场，与传统的稳定平台弹簧重力仪相比，SAVG具有以下优点：-捷联伊穆斯在尺寸、重量、功耗和成本方面都有很大的节省。此外，飞机上不需要操作员。SAVG能够确定垂线偏差（矢量重力测量）。最近SAVG活动的结果表明，SAVG可以更强大地抵抗湍流和机动。达姆施塔特工业大学（TUDa）的物理和卫星大地测量小组提议参加ANTHALO-BI活动（参见“ANTHALO-BI”）。单独的使命提案），提供仪器和现场操作员。对于SAVG部分，ANTHALO-BI活动可以被视为更大的ANTHALO南极洲活动（计划于2020/21年进行）的科学可行性研究。对于这两次活动，TUDa的SAVG实验将作出以下贡献：-1 mGal水平的标量重力测量（水平：0.5 mGal），-垂直偏转（DoV），以0.5角秒精度为目标，和-高精度、高速率的姿态和航向输出（预期精度分别为3和20角秒）。TUDa最近的工作表明，离线IMU校准方法可以显著提高SAVG的整体性能，在最近的SAVG活动中产生1.0-1.4 mGal水平的标量重力（应用交叉调整后为0.5-0.6 mGal）。这是一个出色的性能，达到了经典弹簧重力仪的精度水平。鉴于ANTHALO-BI和ANTHALO活动，SAVG面临的一个特殊挑战是惯性传感器在长距离上的稳定性。因此，本项目的主要目标是设计和评估为远程SAVG量身定制的新型校准技术，旨在提高长期稳定性，并在动态情况下具有更大的鲁棒性，如在机动和强连续性期间。将考虑每个作为传感器温度的函数，以及基于样本的（非参数）误差模型。为了进行评估，除了ANTHALO-BI捷联数据集外，还将使用TUDA现有的SAVG数据集，这些数据集将被用于或将被用于TUDA。