An Accurate Gravity Compensation Method for High-Precision Airborne POS

Fang, Jiancheng; Chen, Linzhouting; Jifeng, Yao

doi:10.1109/tgrs.2013.2282423

Cited by 51 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the application scope of this compensation method is restricted due to the complex manufacturing process, high cost and large volume of gravity gradiometer [4]. The fourth method obtains the measurement information of GNSS/INS integrated navigation system through high-accuracy differential GNSS, such as position, velocity and even acceleration, and then uses the optimal estimation algorithm to estimate and compensate the gravity disturbance and the other systematic errors [3,[16][17][18][19][20][21]. Although the accuracy of this method is high, its autonomy and reliability cannot be guaranteed because GNSS is vulnerable to interference and occlusion [22,23].…”

Section: Introductionmentioning

confidence: 99%

An autonomous and high-accuracy gravity disturbance compensation scheme for rotary inertial navigation system

Yang,

Wang,

Wang

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

With the increasing demands for long-endurance and high-accuracy inertial navigation system (INS), gravity disturbance has been identified as one of the major error sources with decisive effects on the performance of INS. To address the problem, this paper proposes an autonomous and high-accuracy gravity disturbance compensation scheme for rotary INS (RINS). The high-accuracy velocity measured by the laser Doppler velocimeter is fused with the angular velocity measured by the gyroscope to obtain navigation parameters, such as velocity, position and attitude, that are not affected by gravity disturbance. The navigation parameters independent of gravity disturbance are matched with the gravity disturbance-related navigation parameters output by RINS, and a measurement model containing gravity disturbance information is obtained. Besides, the intrinsic coupling relationship between gravity disturbance, gravity disturbance rate and gravity disturbance gradient is revealed, and a state-space model is established to accurately reflect the time-varying characteristics of gravity disturbance. Furthermore, the gravity disturbance is estimated and compensated in real-time through the optimal estimation algorithm. The results of vehicle experiments indicate that the gravity disturbance estimation precision of the proposed scheme is better than 2.15 mGal (1σ), and its horizontal position accuracy is better than 50 m at a driving distance of 80 km.

show abstract

Section: Introductionmentioning

confidence: 99%

An autonomous and high-accuracy gravity disturbance compensation scheme for rotary inertial navigation system

Yang,

Wang,

Wang

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The DOV is considered as the main navigation error in INS. To improve the performance of the INS, the DOV should be compensated for initial alignment and navigation [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Calculation method for deflection of the vertical based on path gravity anomaly compensation

Hao¹,

Zhou²,

Xu³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

To solve the inefficiency and complete autonomy issues for Deflection of the Vertical (DOV) determination in geomatics, navigation, and military weapon launching fields, a calculation method based on path compensation has been proposed. After conducting the discretization of the Vening-Meinesz formula in the spherical surface, a novel path gravity anomaly compensation based on the “remove-restore” algorithm was formulated to satisfy the requirement of regional high-precision gravity anomaly data. Meanwhile, utilizing the gravity field spherical harmonic model EIGEN-6c4, the deflection of the vertical was calculated using the Vening-Meinesz formula based on the “remove-restore” method, unlike the previous regional direct integral calculations. Finally, to verify the reliability and feasibility of the algorithm, the gravity measurement system, consisting of the high-precision gravimeter and Strapdown Inertial Navigation System, was constructed to conduct the simulation and shipborne experiments. The simulation and experiment results of the proposed method show that the root mean squares, relative to the real values, of DOV calculation components, are 0.89" and 1.67", while standard deviation values of the DOV components are the same within 2" in experiments, which satisfies the precision requirement of the DOV.

show abstract

“…Because the observation windows are distributed in different positions of the non-rigid platform, the orientation stability control mode of each remote sensing device is different, and each remote sensing device needs to use Position and Orientation System (POS), in which the Inertial Measurement Unit (IMU) is fixed in different positions together with the load. At the same time, the imaging radar based on the distributed multi-subarray antenna structure, such as the long baseline InSAR and the large array antenna SAR, is developed from single antenna to multi antenna to achieve three-dimensional stereoscopic imaging [4,5]. However, as the performance improves, the more array the element is, the more complex the baseline distribution is, and the more significant the flexible baseline is; the signal processing needs to use POS data information at the subarray level and requires information at the subarray level and requires the distributed POS (DPOS) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Airborne Distributed Position and Orientation System Transfer Alignment Method Based on Fiber Bragg Grating

Wang³

2020

Sensors

View full text Add to dashboard Cite

With the demand for high resolution remote sensing, load array technology has gradually become an effective measure to improve imaging resolution. However, the external flow and internal engine vibration disturbance may lead to the flexible deformation of wings. The traditional rigid baseline error compensation method cannot solve the problem of serious coupling movement error caused by flexible deformation. To address the problem, a transfer alignment model based on fiber Bragg grating for distributed position and orientation system is proposed in this paper. Firstly, based on the multidimensional requirements of flexible deformation information, the layout scheme of fiber Bragg grating was designed, then the continuous strain in the wing surface was obtained after the quadratic fitting of strain measured by fiber Bragg gratings, and the deformation displacement and angle are calculated. Thirdly, flexible deformation compensation for distributed position and orientation system based on fiber Bragg grating was studied. The state equation including position error, velocity error, misalignment angle, and inertial device error was established. The position and attitude information compensated by the flexible lever arm was used as the quantitative measurement. The filtering estimation improved the measurement accuracy of the slave inertial navigation systems. At last, the experiment was carried out and showed that the accuracy of the transfer alignment has been improved significantly. the distributed POS (DPOS) [6,7]. DPOS is composed of a high-precision master IMU, a navigation computer, a global positioning system, and a number of low-precision sub-IMUs. IMU is installed at the different nodes of the carrier, and transfer alignment of each sub-IMU is carried out using the high-precision navigation information obtained from the main POS, which can provide accurate position and orientation information for all the phase points of distributed SAR and other kinds of loads, and achieve high-precision imaging [8].The subarray antenna is often installed at different wing nodes, which is limited by volume weight and even cost and conducts distributed motion measurement often using MEMS-IMU, and its precision is far lower than that of the main system. When the array antenna SAR is three-dimensional imaging, not only is the motion compensation required at each node, but also the required precision of the baseline length between nodes is very high [9]. At present, most of the technical means are accomplished by mathematical modeling or filtering, for example, the second-order Markov process is used to describe the deformation process, in which the parameters are often selected through experience, and the aerodynamics model is used to analyze the wing model [10,11]; the process is very complex, and the wing material, vibration frequency and wing length should be considered. The model based on CKF is used, which features poor anti-interference performance [12,13]. Moreover, the mathematical modeling method has strong pertinence ...

show abstract

An Accurate Gravity Compensation Method for High-Precision Airborne POS

Cited by 51 publications

References 27 publications

An autonomous and high-accuracy gravity disturbance compensation scheme for rotary inertial navigation system

An autonomous and high-accuracy gravity disturbance compensation scheme for rotary inertial navigation system

Calculation method for deflection of the vertical based on path gravity anomaly compensation

Airborne Distributed Position and Orientation System Transfer Alignment Method Based on Fiber Bragg Grating

Contact Info

Product

Resources

About