Key technologies for on-orbit azimuth antenna pattern measurement of TH-2 dual satellites

doi:10.11947/j.AGCS.2022.20210373

Abstract

Abstract: On-orbit (inflight) measurement of the antenna pattern of space-borne synthetic aperture radar (SAR) is an indispensable and important procedure for SAR calibration, performance tuning and index test. Usually, in practical on-orbit (inflight) measurement of the SAR antenna pattern, it is separated into the vertical (elevation) and the horizontal (azimuth) directions respectively. The TH-2 satellite set is made up of two satellites to enable bistatic interferometry SAR (InSAR) observation. At the beginning of the on-orbit tests, the two satellites adopted a “following” flying formation in which one satellite flew about 40km away after the other one. In this phase, the two satellites worked independently in SAR observation model to facilitate calibration, tuning and test of the satellites individually. When conducting the azimuth antenna pattern measurement, the collected signals from the two satellites in the ground receiver were overlapped (interleaved) and superposed, leading to the difficulty of measurement with the method designed for only one satellite. Aiming at solving this problem, an efficient and fully automated signal separation method for azimuth antenna pattern measurement is proposed. Based on the modeling and analysis of the sampled signal in the ground receiver, a novel signal separation method based on three main parts: key pulse rising edge extraction, pulse position estimation and pulse amplitude estimation is proposed to realize the separation of the signals from different satellites. After signal separation, the subsequent antenna pattern measurement tasks can be done using the traditional single-satellite method. Experimental results sufficiently show the effectiveness of the proposed method. This method escorted the on-orbit tests of the satellites smoothly, and the test efficiency can be doubled compared with the individual test of each single satellite. The proposed method can be used in the on-orbit tests of similar satellites in the future.

Key words: antenna pattern, azimuth antenna pattern, signal separation, InSAR satellites, on-orbit tests

CLC Number:

P237

GAO Jingkun, WANG Zhilong, CHENG Jiasheng, CONG Lin, FAN Weikang, HU Zhenlong. Key technologies for on-orbit azimuth antenna pattern measurement of TH-2 dual satellites[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2470-2480.

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References

[1] CUMMING I G, WONG F H. Digital processing of synthetic aperture radar data:algorithms and implementation[M]. Boston:Artech House, 2005.
[2] GOLDSTEIN R M, ENGELHARDT H, KAMB B, et al. Satellite radar interferometry for monitoring ice sheet motion:application to an Antarctic ice stream[J]. Science, 1993, 262(5139):1525-1530.
[3] YAGVE-MARTÍNEZ N, PRATS-IRAOLA P, RODRÍGUEZ GONZÁLEZ F, et al. Interferometric processing of sentinel-1 TOPS data[J]. IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(4):2220-2234.
[4] 王志伟. 基于多源InSAR数据的三维地表形变解算方法研究[J]. 测绘学报, 2019, 48(9):1206.DOI:10.11947/j.AGCS.2019.20180490. WANG Zhiwei. Research on resolving of three-dimensional displacement from multi-source InSAR data[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(9):1206.DOI:10.11947/j.AGCS.2019.20180490.
[5] 唐新明, 李涛, 高小明, 等. 雷达卫星自动成图的精密干涉测量关键技术[J]. 测绘学报, 2018, 47(6):730-740.DOI:10.11947/j.AGCS.2018.20170621. TANG Xinming, LI Tao, GAO Xiaoming, et al. Research on key technologies of precise InSAR surveying and mapping application using automatic SAR imaging[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(6):730-740.DOI:10.11947/j.AGCS.2018.20170621.
[6] 赵争. 地形复杂区域InSAR高精度DEM提取方法[J]. 测绘学报, 2016, 45(11):1385.DOI:10.11947/j.AGCS.2016.20160357. ZHAO Zheng. Methods on high-accuracy DEM extraction from interferometric SAR in sophisticated terrain areas[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(11):1385.DOI:10.11947/j.AGCS.2016.20160357.
[7] LI Zhenhong, YU Chen, XIAO Ruya, et al. Entering a new era of InSAR:advanced techniques and emerging applications[J]. Journal of Geodesy and Geoinformation Science, 2022, 5(1):1-4.
[8] BING XU, LIQUN LIU, ZHIWEI LI, et al. Design bistatic interferometric DEM generation algorithm and its theoretical accuracy analysis for LuTan-1 satellites[J]. Journal of Geodesy and Geoinformation Science, 2022(1):25-38.
[9] DAI Keren, RAN Peilian, LI Zhenhong, et al. Land subsidence in Xiong'an new area, China revealed by InSAR observations[J]. Journal of Geodesy and Geoinformation Science, 2021, 4(1):70-76.
[10] Bojarski A, Bachmann M, Boer J, et al. TerraSAR-X and TanDEM-X mission status and an outlook to the future[C]//Proceedings of the 20th International Radar Symposium (IRS). Ulm, Germany:IEEE,2019:1-10.
[11] FREEMAN A. SAR calibration:an overview[J]. IEEE Transactions on Geoscience and Remote Sensing, 1992, 30(6):1107-1121.
[12] 洪峻, 明峰, 胡继伟. 星载SAR天线方向图在轨测量技术发展现状与趋势[J]. 雷达学报, 2012, 1(3):217-224. HONG Jun, MING Feng, HU Jiwei. Current situation and development trend of inflight antenna pattern measurement techniques of spaceborne SAR[J]. Journal of Radars, 2012, 1(3):217-224.
[13] BORN G H, DUNNE J A, LAME D B. Seasat mission overview[J]. Science, 1979, 204(4400):1405-1406.
[14] FREEMAN A, ALVES M, CHAPMAN B, et al. SIR-C data quality and calibration results[J]. IEEE Transactions on Geoscience and Remote Sensing, 1995, 33(4):848-857.
[15] BROCKLEY D J, BAKER S, FÉMÉNIAS P, et al. REAPER:reprocessing 12 years of ERS-1 and ERS-2 altimeters and microwave radiometer data[J]. IEEE Transactions on Geoscience and Remote Sensing, 2017, 55(10):5506-5514.
[16] MASSONNET D, VADON H. EES-1 internal clock drift measured by interferometry[J]. IEEE Transactions on Geoscience and Remote Sensing, 1995, 33(2):401-408.
[17] ZINK M, TORRES R, BUCK C H, et al. Calibration and early results of the ASAR on ENVISAT[C]//Proceedings of IEEE International Geoscience and Remote Sensing Symposium. Toronto, ON, Canada. IEEE,2002:596-598.
[18] THOMPSON A A, RACINE D, LUSCOMBE A P. RADARSAT-2 antenna calibration using ground receivers/transmitters[C]//Proceedings of 2002 IEEE International Geoscience and Remote Sensing Symposium. Toronto,ON, Canada. IEEE, 2002:1465-1467.
[19] SNOEIJ P, ATTEMA E, DAVIDSON M, et al. Sentinel-1 radar mission:status and performance[J]. IEEE Aerospace and Electronic Systems Magazine, 2010, 25(8):32-39.
[20] SCHWERDT M, BRAUTIGAM B, BACHMANN M, et al. Final results of the efficient TerraSAR-X calibration method[C]//Proceedings of 2008 IEEE Radar Conference. Rome, Italy. IEEE, 2008:1-6.
[21] BRAUTIGAM B, GONZALEZ J H, SCHWERDT M, et al. TerraSAR-X instrument calibration results and extension for TanDEM-X[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(2):702-715.
[22] 丁赤飚, 刘佳音, 雷斌, 等. 高分三号SAR卫星系统级几何定位精度初探[J]. 雷达学报, 2017, 6(1):11-16. DING Chibiao, LIU Jiayin, LEI Bin, et al. Preliminary exploration of systematic geolocation accuracy of GF-3 SAR satellite system[J]. Journal of Radars, 2017, 6(1):11-16.
[23] DOBSON M C, ULABY F T, BRUNFELDT D R, et al. External calibration of SIR-B imagery with area-extended and point targets[J]. IEEE Transactions on Geoscience and Remote Sensing, 1986, 24(4):453-461.
[24] SHIMADA M, FREEMAN A. A technique for measurement of spaceborne SAR antenna patterns using distributed targets[J]. IEEE Transactions on Geoscience and Remote Sensing, 1995, 33(1):100-114.
[25] SEIFERT P, LENTZ H, ZINK M, et al. Ground-based measurements of inflight antenna patterns for imaging radar systems[J]. IEEE Transactions on Geoscience and Remote Sensing, 1992, 30(6):1131-1136.
[26] 王晓林, 洪峻. 应用编码发射机在轨测量SAR天线方向图[J]. 电子测量技术, 2006, 29(1):81-82. WANG Xiaolin, HONG Jun. Inflight measurement of antenna pattern for spaceborne SAR using encoding transmitters[J]. Electronic Measurement Technology, 2006, 29(1):81-82.
[27] ZINK M,JACKSON H. ASAR external characterization[C]//Proceedings of 2003 CEOS SAR Workshop.London, U.K.:CDROM,2002.
[28] BACHMANN M, SCHWERDT M, BRAUTIGAM B. Terra-SAR-X antenna calibration and monitoring based on a precise antenna model[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(2):690-701.
[29] 楼良盛, 刘志铭, 张昊, 等. 天绘二号卫星工程设计与实现[J]. 测绘学报, 2020, 49(10):1252-1264.DOI:10.11947/j.AGCS.2020.20200175. LOU Liangsheng, LIU Zhiming, ZHANG Hao, et al. TH-2 satellite engineering design and implementation[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(10):1252-1264.DOI:10.11947/j.AGCS.2020.20200175.