Comparison and analysis of two baseline calibration models for TH-2 satellite

doi:10.11947/j.AGCS.2022.20210316

Abstract

Abstract: The two equivalent satellites in the TH-2 satellite system formed a flying-around formation in early July 2019, and began to obtain global radar interference data using the one-transmit and double-receiving system. The precise interference baseline is to realize the production of high-precision surveying and mapping products. This article gives the definition of the baseline in the antenna phase center (APC) coordinate system of the main radar. It introduces the single-scene data baseline calibration model based on the slave radar range modification equation and doppler equation under the one-transmit and double-receiving system, and a joint near-far beam positions calibration model of obtaining parallel and effective baseline errors by steps. According to the principle of baseline error intersection, a control points selection strategy is given, that is, the strategy of selecting control points in the near and far sub strips. The 17 times Xinjiang calibration field data acquired by TH-2 was used to carry out single-scene data and near-far beam positions joint baseline calibration experiments, and the ground positioning precision analysis of the two baseline calibration models after calibration was carried out. The experiments show that the average horizontal baseline error is -2.74mm, and the average vertical baseline error is -5.49mm calibrated by the single-scene data model. The average horizontal baseline error is -1.95mm, and the average vertical baseline error is -5.84mm calibrated by the near-far beam positions joint model. The ground positioning precision of the system after the near-far beam positions joint baseline calibration is higher than that of the single-scene data baseline calibration.

Key words: interferometric synthetic aperture radar, TH-2, baseline calibration, positioning precision

CLC Number:

P237

QIAN Fangming, CHEN Gang, LOU Liangsheng, LIU Wei, ZHANG Hao, MENG Xin. Comparison and analysis of two baseline calibration models for TH-2 satellite[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2425-2432.

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