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200920212022

论文（36）

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1CBERS X-SAR Imaging Mode and Internal Calibration

Shirun Li, Wanlin Wang,Chong Ni, Xin Liu,Yong Lei, Mateus C. F. Aguiar,Xiaomin Tan

2026IET Conference Proceedings

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2System Design and Key Technologies of No.4 Land Exploration Satellite 01

Qingjun Zhang,Chong Ni,Chao Dai, Liping Liu,Zhihua Tang,Weiping Shu

In order to solve the problem of small imaging width and long revisiting time of low orbit SAR,China developed the No.4 land exploration satellite 01,which is a scientific satellite in the medium and long term development plan of national civil space infrastructure(2015-2025),and is the world's first geosynchronous SAR satellite.Using the advantages of the geosynchronous orbit,the revisiting time of the same place can be reduced from the day level of low orbit satellite to the hour level,and the width can be increased from the hundred-kilometer level of low orbit satellite to the thousand-kilometer level,which can provide strong support for the effective implementation of disaster emergency response.For the new system of geosynchronous SAR microwave imaging,a series of key technologies are developed,such as microwave imaging for geosynchronous SAR,ultra-large power space-borne microwave transmission,ultra-large aperture space-borne antenna,large-flexibility and high-precision attitude stability control,intense pulse high-quality large power supply,integrated efficient thermal management for payload and platform,and integrated satellite-ground high-precision orbit determination.The satellite has the capability of quick revisit,large width,all-day and all-weather observation.The overall design of the satellite is introduced,and the technical innovation is summarized.Through the evaluation of the preliminary test results for the satellite in orbit,the geosynchronous SAR images have clear texture and good quality,which can meet the requirements of disaster prevention and reduction,land resource exploration and other tasks.

2025CHINESE SPACE SCIENCE AND TECHNOLOGY（2025）

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3Influence Analysis and Verification of Equipment Electromagnetic Radiation on GEO SAR Payload

Yuting Zhang,Miao Xiao,Zhenxing Wang,Chong Ni,Liping Liu,Zhihua Tang

Aiming at the higher electromagnetic compatibility control requirements of GEO SAR satellite, this paper studies the analysis and verification technology of the electromagnetic radiation influence produced by the electronic equipment on SAR payload during the development of equipment and subsystems. A hierarchical electromagnetic compatibility analysis method is proposed to reduce the difficulty of electromagnetic compatibility analysis of complex satellite system with multi feeds and multi beam positions of SAR Antenna. Based on the reciprocity theorem of electromagnetic field, the RE102 test results of electronic equipment are directly applied to the electromagnetic compatibility analysis. The multi frequency interference verification method is adopted to solve the problem that the traditional frequency sweep test method cannot characterize the coexistence of multi frequency interferences in the actual electromagnetic environment. A verification system based on SAR imaging index is designed, which improves the evaluation accuracy compared with the method based on telemetry parameter judgment. The research content of this paper is of certain significance to ensure the electromagnetic compatibility of GEO SAR satellite system.

20222022 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)

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4Approximate Calculation and Verification of Electrical Performance of Deformed Reflector Antenna

Li Dinghao,Ni Chong,Du Jingli,Jia Shuang

With the development of reflector antennas in the direction of large-aperture, high-frequency, high-gain, etc., research on electromechanical integration has become a focused area. However, a critical problem in electromechanical integration: electromagnetic analysis calculations are gradually increasing, resulting in a decrease in the efficiency of electromechanical integration design. Consequently, it is necessary to study electromagnetic fast approximate calculation methods. While ignoring the influence of structural deformation on the aperture field amplitude term, this article first introduces the structural deformation in the form of phase error into the radiation integral formula of the physical optics method to calculate the far-field electrical properties. Then the additional phase term caused by structural deformation is expanded by Taylor series, and finally the calculation formula is organized into matrix form. This paper takes a large-scale satellite-borne deployable antenna as the research object, two typical moments when the antenna is orbiting on the vernal equinox are selected for simulation calculation, and satisfactory results are received, which verifies the correctness of the method.

2022Proceedings of the Eighth Asia International Symposium on Mechatronics（2022）

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5Deformation and Shape Optimization of Membrane Reflective Surface Based on Element-Free Galerkin Method

Shuang Jia,Chong Ni,Jingli Du, Dinghao Li

The membrane surface is a new type of reflective surface that has emerged in recent years, which is an important part of the deployable antenna. The characteristic of membrane is that it can’t bear bending moment and shear force, but can only bear tensile force. At present, there are three numerical analysis methods for membrane form-finding analysis: force density method, dynamic relaxation method and nonlinear finite element method, but the accuracy and convergence of those methods are all affected by the discrete grid structure. Based on this, this paper uses a new element-free Galerkin numerical method to analyze the mechanical properties of the membrane and the shape optimization of the structure. First, the membrane surface adopts the orthogonal curvilinear coordinate system of the shell to discretize the solution domain into a series of field nodes, and the moving least square method is used to approximately construct the displacement function of any point in the curved surface of the membrane reflecting surface. Then, based on the basic equation of the membrane distance theory, the discrete system equation is obtained from the weak form of the energy functional, and the penalty function method is introduced to impose essential boundary conditions. Finally, a numerical example is used to analyze the reflective surface of a membrane with a certain diameter. The results show that by using the mesh-less method are in good agreement with the results of the distraction using the finite element ANSYS software. At the same time, the mesh-free program for analyzing the reflective surface of the membrane written by MATLAB software is universal, and it can analyze the deformation of any rotating parabolic membrane.

2022Proceedings of the Eighth Asia International Symposium on Mechatronics（2022）

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6Gradient Enhanced Dual Regression Network: Perception-Preserving Super-Resolution for Multi-Sensor Remote Sensing Imagery

Zhenzhou Zhang,Kun Gao,Junwei Wang,Lei Min,Shijing Ji,Chong Ni,Dayu Chen

Most existing learning-based single image super-resolution (SISR) methods mainly focus on improving reconstruction accuracy, but they always generate overly smoothed results that fail to match the visual perception. Although perceptual quality can be greatly improved via introducing adversarial loss, image fidelity may decrease to some extent. Moreover, most methods are trained and evaluated on simulated datasets and their performance would drop significantly on real remote sensing imagery. To solve the above problems, we propose a new SISR algorithm named gradient enhanced dual regression network (GEDRN). Based on the dual regression framework, we use share-source residual structure and non-local operation to learn abundant low-frequency information and long-distance spatial correlations. Besides, we not only introduce additional gradient information to avoid blurry results but also apply gradient loss and perceptual loss to further improve the perceptual quality. Our GEDRN is trained and tested on real-world multi-sensor satellite images. Experimental results demonstrate the superiority of the proposed method in achieving much better perceptual quality and ensuring high fidelity.

2022IEEE GEOSCIENCE AND REMOTE SENSING LETTERS（2022）引用：4

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7Comprehensive Compensation Method of Beam Error for GEO SAR

NI Chong,ZHANG Qingjun,LIU Jie,TANG Zhihua,ZHENG Gangtie

与低地球轨道合成孔径雷达(LEO SAR)相比,地球同步轨道合成孔径雷达(GEO SAR)具有合成孔径时间长、波足速度慢和幅宽大的特点.根据GEO SAR的特点,提出GEO SAR波束误差综合补偿方法,主要包括基于主被动联合振动抑制的高精度波束指向稳定度控制、基于卫星平台姿态摆动的波束方向图测量和基于分块处理的数据域波束误差补偿.该方法综合考虑了GEO SAR波束在各环节的误差源,可以最大限度地补偿波束误差,从而很好地改善GEO SAR的成像质量.

2022Spacecraft Engineering（2022）

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8Experiment of Measuring Targets' Full-Parameters Microwave Properties

邵芸,宫华泽,田维,张庆君,王国军,卞小林,张婷婷,张风丽,李坤,刘致曲,倪崇

2021引用：7

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9A Full-Parameters Microwave Properties Measurement System of 20m Diameter Anechoic Chamber.

Wei Tian,Yun Shao,Zhiqu Liu,Qiufang Wei,Zhihua Tang,Chong Ni

Measurement of microwave characteristics for targets in an anechoic chamber could improve the cognition of EM waves scattering mechanism. In this paper, a Full-Parameters Microwave Properties Measurement System (LAMP) was introduced, including the overall capabilities, the antenna RF system and etc. The Radar Cross Section (RCS) measurement and SAR images measured by LAMP, were demonstrated in this paper, when the frequencies of EM waves, the incidence angles and the azimuth angles varied It was verified that the accuracy of RCS of a metal sphere measured by LAMP was 1.09dBsm and 1.00dBsm in HH and VV polarization, respectively, comparing with Mie scattering computational results, when the frequency involved ranging from 2.5GHz to 18GHz.

2021IGARSS（2021）引用：5

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10Multi-objective Optimization Design of Cable Net Structure for Deployable Antenna Considering Truss Deformation

保宏,倪崇,杜敬利,杜雪林,王飞杰,廉荫虎

索网结构是可展开天线的重要组成部分,在桁架的支撑下,索网结构的前/后索网和竖向索阵处于张紧状态,形成满足精度要求的工作反射面.本文提出了一种可以考虑桁架变形的索网形态设计方法.首先,基于索网结构的平衡矩阵奇异值分解,约束索段张力并以索力均匀为目标,通过优化求解找到一组最优预张力.将索网挂接在桁架上,以索段的预张力和前索网节点的位置增量为设计变量,以直接与桁架连接索段的张力改变量的均方根值,索段预张力均匀性和反射面形面精度为目标,约束索段张力和节点位置增量的取值范围,建立了索网结构多目标优化模型.最后通过相应算例,验证了方法的正确性.

2021Mechanical Science and Technology for Aerospace Engineering（2021）

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11Spatial Dynamic Analysis of Large-scale Cable Net Reflector Antenna

杜敬利,李博韬,倪崇,王飞杰,廉荫虎

大型可展开索网反射面天线是目前较为理想的天线结构形式.由于其自身的结构特点以及复杂的空间环境因素,天线在运行时易产生大幅度振动变形,严重影响卫星的稳定运行.文中以某星载大型可展开索网反射面天线为切入点,对其进行了空间动力学分析.针对天线与中心刚体之间的多体动力学刚–柔耦合问题,首先根据模型分析参数建立了卫星–天线–太阳翼的星体系统模型,然后对该多体动力学模型系统进行了模态分析和瞬态动力学响应分析,从频域和时域上分析其振动特性,并分析了天线网面的形面精度随时间的变化规律.

2021Electro-Mechanical Engineering（2021）

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12Multisensor Remote Sensing Imagery Super-Resolution with Conditional GAN

Junwei Wang,Kun Gao,Zhenzhou Zhang,Chong Ni,Zibo Hu,Dayu Chen,Qiong Wu

Despite the promising performance on benchmark datasets that deep convolutional neural networks have exhibited in single image super-resolution (SISR), there are two underlying limitations to existing methods. First, current supervised learning-based SISR methods for remote sensing satellite imagery do not use paired real sensor data, instead operating on simulated high-resolution (HR) and low-resolution (LR) image-pairs (typically HR images with their bicubic-degraded LR counterparts), which often yield poor performance on real-world LR images. Second, SISR is an ill-posed problem, and the super-resolved image from discriminatively trained networks with lp norm loss is an average of the infinite possible HR images, thus, always has low perceptual quality. Though this issue can be mitigated by generative adversarial network (GAN), it is still hard to search in the whole solution-space and find the best solution. In this paper, we focus on real-world application and introduce a new multisensor dataset for real-world remote sensing satellite imagery super-resolution. In addition, we propose a novel conditional GAN scheme for SISR task which can further reduce the solution-space. Therefore, the super-resolved images have not only high fidelity, but high perceptual quality as well. Extensive experiments demonstrate that networks trained on the introduced dataset can obtain better performances than those trained on simulated data. Additionally, the proposed conditional GAN scheme can achieve better perceptual quality while obtaining comparable fidelity over the state-of-the-art methods.

2021Journal of Remote Sensing（2021）引用：30

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13Experimental Study on Thermal Ratcheting Effect of NiTi Shape Memory Alloy

Fengqun Pan,Xiangjun Jiang,Chong Ni,Jingli Du

Shape memory cable net structure using the servo type driven of shape memory alloy (SMA) to achieve the orbit adjustment of surface precision of cable net structure. However, the SMA has to experience the long-term cyclic thermal load in space, which will produce the thermal ratcheting effect and reduce the adjusting ability of SMA. Therefore, this paper takes the SMA in shape memory cable net structure working in the bad environment of the space as the research object. The experimental study was carried out for the thermal ratcheting effect of SMA wire in the range of different pretensions and different temperatures. The results show that the cumulative evolution of residual martensite has important influence on the attenuation of tension force of wire and temperature evolution of austenite transformation and martensite transformation.

2020

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14A New Prompt 2-D Attitude Steering Approach for Zero Doppler Centroid of GEOsynchronous SAR

Zhao Bingji,Zhang Qingjun,Dai Chao,Liu Liping,Tang Zhihua,Shu Weiping,Ni Chong

A new prompt 2-D attitude steering approach for zero Doppler centroid of GEOsynchronous SAR (GEOSAR) is proposed. Large yaw angle of GEOSAR in traditional 2-D yaw steering condition can be solved by this method. It is suited to the large satellite such as GEOSAR. The GEOSAR can achieve broadside imaging when this method is applied. Compared to the traditional attitude steering approach, the steering angle and time are just 1/10 of it, and the developing difficulty of GEOSAR becomes lower through this new method. This approach is propitious to GEOSAR. When it is employed to SAR satellites with different altitudes, the residual Doppler centroid is accurate zero in all the conditions. Besides, an attitude selection reference standard is illustrated for different altitude orbital satellites.

2019JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY（2019）引用：2

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15A Parameter Optimization Model for Geosynchronous SAR Sensor in Aspects of Signal Bandwidth and Integration Time

Jianlai Chen,Guang-Cai Sun,Mengdao Xing,Jun Yang,Chong Ni,Yu Zhu,Weiping Shu,Wenkang Liu

Signal bandwidth and integration time are two significant parameters of a geosynchronous synthetic aperture radar (SAR) sensor. They directly determine the resolution characteristic of SAR imagery. Because their contributions to the ground impulse response width (IRW) curve (consists of -3-dB resolutions in every direction) are severely coupled, an analytical extraction method of the ground IRW curve is studied to analyze the coupling characteristic. Due to the coupling, the IRW curve is generally spatially variant and, thus, can degrade the quality of SAR imagery. To minimize the variation, the two parameters are optimized. However, the optimized signal bandwidth is found to be satellite position varied, which complicates the system design. To solve this problem, a parameter optimization model is built to obtain one optimal signal bandwidth as well as to decrease the variation.

2016IEEE Geoscience and Remote Sensing Letters（2016）引用：23

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16Imaging Mechanism Verification of GEO SAR Based on Beidou Navigation Satellite Signal

Chong NI,Qingjun ZHANG, Jie LIU, Yu ZHU,Weiming TIAN

为了验证地球同步轨道合成孔径雷达(GEO SAR)的成像机理,采用倾斜地球同步轨道(IGSO)北斗导航卫星作为照射源,通过地面接收北斗导航卫星信号和地面反射的回波信号,实现对GEO SAR成像机理的等效性验证.北斗导航卫星具有与GEO SAR卫星相似的轨道,地面接收的信号可以等效成单程传播的GEO SAR回波信号;成像处理采用与GEO SAR相同的合成孔径时间,在合成孔径时间内地面反射的北斗导航卫星信号具有与单程传播的GEO SAR回波信号相似的距离徙动特性和多普勒特性,可实现长合成孔径时间条件下GEO SAR成像机理的验证.通过双基地试验实现了应用北斗导航卫星信号的GEO SAR成像机理的等效性验证.

2016Spacecraft Engineering（2016）引用：2

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17BEIDOU衛星航法信号を用いたGEO SAR画像化メカニズムの検証方法【JST・京大機械翻訳】

Ni Chong, Qingjun Zhang,Liu Jie, Yu Zhu, Wei‐Ming Tian

2016Hangtianqi Gongcheng

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18Methods of the Integrated Error Compensation for SAR

Chong Ni,Qingjun Zhang,Jie Liu,Yu Zhu,Gangtie Zheng

This paper analyzes the various sources of the errors in the full link of the SAR satellite, and also studies the methods of the integrated error compensation for SAR. These methods mainly include the method based on the control unit, the method based on the measured data and the method based on the SAR echo data. This is an important reference for the high precision SAR imaging and data processing.

2015IET International Radar Conference 2015（2015）

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19Critical Baseline Analysis in GEO Repeat Pass InSAR

Tiandong Liu,Yu Zhu,Chong Ni,Zegang Ding

Compared with LEO SAR, the orbital altitude of GEO SAR is higher and the orbital eccentricity is larger, so the spatial decorrelation model of traditional LEO repeat pass InSAR can not be applicable for the GEO repeat pass InSAR. Considering the special problems of GEO repeat pass InSAR, a spatial decorrelation model is established which is applicable for the GEO repeat pass InSAR and the expressions of spatial decorrelation coefficient and the critical baseline are derived. Finally, the critical baseline in GEO repeat pass InSAR is simulated when J2 perturbation is considered.

2013Xi'an引用：1

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20Space-borne Spotlight SAR Interferometry Processing

Yuanhao Li,Cheng Hu,Teng Long,Chong Ni

SAR interferometry processing technology has developed for a few decades, and it is widely used in many geoscience applications. Nevertheless, conventional SAR interferometry processing methods do not suit for space-borne spotlight SAR interferometry processing. Based on co-registration with Doppler centroid frequency estimation and joint phase unwrapping method, a novel space-borne spotlight SAR interferometry processing method is proposed. It is validated by TerraSAR-X spotlight SAR data. Compared with SRTM data, the results show a clear improvement in DEM construction.

2013Xi'an

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