Deformation Tests of Satellite Antenna in the High-Low Temperature Environment

Huang, Guiping; Ma, Kai-Kuang; Ma, Tran

doi:10.1109/ihmsc.2016.47

Cited by 6 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With regard to the total station system measurement, the application of micro-triangulation with DAEDALUS system in total station is conceivable at an accuracy level of 10 μm for object with the size in the order of 1-3 m [14]. For digital photogrammetry, the digital close-range photogrammetry can be employed in a satellite antenna with the approximate diameter of 500 mm and the maximum value of RMS is tested as 0.048 mm for repetitive measurement accuracy [15]. The requirements of noncontact measurement are the stable measurement benchmark and enough space without sheltering.…”

Section: Compensation Calculation Model Of Excitation Current For Plamentioning

confidence: 99%

Compensation method for distorted planar array antennas based on structural–electromagnetic coupling and fast Fourier transform

Wang

Zhou

et al. 2018

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

Complex operating environment could introduce serious degradation to the electromagnetic performance of active phased array antenna in both the main lobe and sidelobe areas. The effective compensation techniques become the key for antenna to perform in reliable service condition. Therefore, a method combined coupled structural‐electromagnetic model with two‐dimensional fast Fourier transform for compensation is presented. A compensation calculation model of the excitation current for planar array is established accordingly, quantitatively expressing the relationship between the excitation current compensation and the structure error. The adjustment quantities of excitation amplitude and phase can be quickly obtained and implemented to recover a high‐quality pattern from a distorted antenna in both the main lobe and sidelobe areas. Lastly, the simulation of the space‐based array antenna is illustrated to compensate its property under the impact of space environment and heat power from its electric devices. Furthermore, an experiment platform of an X‐band active phased array antenna with 32×24 elements is built and tested for the electromagnetic performance compensation. The simulation and experimental results show that the proposed method can guarantee the performance of the service antenna quickly and effectively in the whole observation area.

show abstract

Section: Compensation Calculation Model Of Excitation Current For Plamentioning

confidence: 99%

Compensation method for distorted planar array antennas based on structural–electromagnetic coupling and fast Fourier transform

Wang

Zhou

et al. 2018

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

show abstract

“…Especially in millimeter wave band, the root mean square (RMS) surface error needs to be less than 50 microns to maintain the observation efficiency more than 50% [1]. At present, many advanced large aperture radio telescopes are equipped with antenna active surface system to compensate their surface deformation caused by its weight [2], temperature [3] or wind [4] in real time. However, real-time deformation compensation requires an accurate method for measuring the antenna surface in real-time to obtain the deformation distribution.…”

Section: Introductionmentioning

confidence: 99%

Radio Telescope Surface Measurement via Deep Learning

Wang,

Ye,

Meng

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

This paper proposes a new method for accurately measuring the surface deformation of radio telescope antennas based on deep learning. A deep convolutional neural network is used to predict surface deformations by mapping the near-field intensity of the antenna, instead of relying entirely on a physical model. The proposed method could offer precise measurement of surface deformations in real time with only a single image of near-field intensity pattern. To optimize the deep learning model, a preliminary U-net based deep convolutional neural network (DCNN) model was developed based on a large data set generated by an approximate physical model, a partial differential equation (PDE). The network parameters were then fine-tuned using transfer learning with a small data set obtained by high precision numerical simulation. During this process, the fine-tuning layers that achieved optimal performance for the U-net network was studied. The final results show that the proposed method significantly improves the accuracy of antenna surface deformation recovery. Additionally, singular value decomposition (SVD) technology is employed to denoise the intensity image, which facilitates the application of the proposed method to actual deformation measurement.

show abstract

“…The surface deformation of the antenna seriously affects its performance and observation high frequency efficiency of the antenna (Ruze 1966). With the requirement of today's real-time surface adjustment of large-diameter antenna, lots of high precision actuators have been employed under many main-reflectors of antennas to compensate for surface deformation due to its weight (Wang et al 2014), temperature (Huang et al 2016) or wind (Zhang et al 2015). However, high-accuracy and real-time deformation measurement is necessary before the compensation.…”

Section: Introductionmentioning

confidence: 99%

Deformation measurement by single spherical near-field intensity measurement for large reflector antenna

Wang

Yao

et al. 2021

Res. Astron. Astrophys.

View full text Add to dashboard Cite

This paper presents a new method to obtain the deformation distribution on the main reflector of an antenna only by measuring the electric intensity on a spherical surface with the focal point as the center of the sphere, regardless of phase. Combining the differential geometry theory with geometric optics method, this paper has derived a deformation-intensity equation to relate the surface deformation to the intensity distribution of a spherical near-field directly. Based on the finite difference method (FDM) and Gauss-Seidel iteration, deformation has been calculated from intensity simulated by geometrical optics (GO) and physical optics (PO) methods, respectively, with relatively small errors, which prove the effectiveness of the equation proposed in this paper. By means of this method, it is possible to measure the deformation only by scanning the electric intensity of a single hemispherical near-field whose area is only about 1/15 of the aperture. The measurement only needs a plane wave at any frequency as the incident wave, which means that both the signals from the outer space satellite and the far-field artificial beacon could be used as the sources. The scanning can be realized no matter what attitude and elevation angle the antenna is in because the size and angle of the hemisphere are changeable.

show abstract

Deformation Tests of Satellite Antenna in the High-Low Temperature Environment

Cited by 6 publications

References 3 publications

Compensation method for distorted planar array antennas based on structural–electromagnetic coupling and fast Fourier transform

Compensation method for distorted planar array antennas based on structural–electromagnetic coupling and fast Fourier transform

Radio Telescope Surface Measurement via Deep Learning

Deformation measurement by single spherical near-field intensity measurement for large reflector antenna

Contact Info

Product

Resources

About