Carrier Differential GPS for Real-Time Control of Large Flexible Structures

Teague, Edward; How, Jonathan P.; Parkinson, Bradford W.

doi:10.1002/j.2161-4296.1997.tb02344.x

Cited by 2 publications

(3 citation statements)

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“…This paper extends the results in Ref. 17 in several key ways. First, this paper provides a more comprehensive discussion of the GPS-based control system, including detailed analysis of the structural model and the full-state feedback regulator.…”

Section: Introductionsupporting

confidence: 85%

Control of Flexible Structures Using GPS: Methods and Experimental Results

Teague¹,

How

Parkinson

1998

Journal of Guidance, Control, and Dynamics

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This paper demonstrates active control of the attitude and vibration of a exible structure using the Global Positioning System GPS. Measurements of the carrier phase of the GPS signal at several antennas are used to estimate the deformation and orientation of the structure. This distributed measurement capability, combined with excellent zero-frequency performance, makes the GPS sensor an excellent choice for a wide range of applications, including space structures, suspension bridges, and skyscrapers. This paper presents the control system developed around the GPS sensor for a particular structure modeled after the Space Station. The results from several new experiments demonstrate that the GPS sensor provides rotational accuracies better than 0.1 for static tests. Measured spectra also demonstrate that the carrier phase GPS techniques are su ciently accurate to resolve many of the modes of vibration. Several feedback control experiments are used to show that the sensor provides an accurate and robust measure of the structural deformations. These experiments culminate in a fast slew maneuver under feedback control which provides a clear demonstration of the application of carrier phase GPS for both alignment and vibration control. This work represents an exciting advancement in the eld of GPS sensing because it shows the potential for GPS as a high precision, real-time structural sensor.

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Section: Introductionsupporting

confidence: 85%

Control of Flexible Structures Using GPS: Methods and Experimental Results

Teague¹,

How

Parkinson

1998

Journal of Guidance, Control, and Dynamics

Self Cite

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show abstract

“…Since the relative distances between antennas and PL TXs are short, relative position vectors between them are no longer assumed as parallel. Instead, a spherical wavefront model was applied [23,24,30]. In Figure 1 the PL signal phase measurement model is shown.…”

Section: Problem Statementmentioning

confidence: 99%

“…For the state-observable discrete measurements model of the PL signal shown in Eq. (1), the corresponding H k matrix is given by (30) where (31) The prediction of the covariance matrix is obtained by (32) Then, the continuous-discrete EKF update equations are summarized by…”

Section: Extended Kalman Filtermentioning

confidence: 99%

Attitude Determination Methods Using Pseudolite Signal Phase Measurements

Park

2006

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In this paper, new attitude determination algorithms using pseudolite signal phase measurements are developed and presented with realistic simulations. Pseudolite signals are used to replace GPS signals which are often not available due to blocking by nearby large structures, for example a crew return vehicle under the International Space Station. A new observation model needs to be applied because spherical wavefronts are present for pseudolite signals, which are much closer to the antennas than GPS signals. Both static and filtering methods are developed. An iterative algorithm using the Levenberg-Marquardt method and a nonlinear Predictive filter provide a deterministic solution; however, they are not suitable for moving cases. Instead, the nonlinear Predictive filter, the extended Kalman filter and the Unscented filter using angular velocity measurements as well as pseudolite signal phase measurements are developed. In the convergence comparison, the Unscented filter and the Predictive filter show more robust behavior than that of the extended Kalman filter.

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Carrier Differential GPS for Real-Time Control of Large Flexible Structures

Cited by 2 publications

References 1 publication

Control of Flexible Structures Using GPS: Methods and Experimental Results

Control of Flexible Structures Using GPS: Methods and Experimental Results

Attitude Determination Methods Using Pseudolite Signal Phase Measurements

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