天绘二号时间同步误差分析与评估验证

Time synchronization error analysis and evaluation of TH-2 satellite

天绘二号卫星采用异轨道面卫星编队、雷达一发双收工作的技术体制,在该技术体制下,协同工作的雷达间必须建立时间同步、相位同步和空间同步。时间同步误差是影响测绘产品幅宽、接收星图像质量和回波相干性的重要因素。本文详述了卫星时间同步机理,从时间同步建立和维持两方面对时间同步误差进行了分析评估,针对时间同步误差对系统性能影响进行了系统分析。卫星地面测试和在轨试验表明,误差分析评估结论可靠。

The TH-2 satellite composed of two equal satellites, it adopts the technical system of satellite formation in different orbits and a bistatic radar transceiver mode.For this technical structure, time synchronization, phase synchronization and space synchronization must be established between two radars.The width of the mapping product, the image quality of the receiving radar, and the echo coherence are greatly affected by time synchronization error.In this paper, The mechanism of satellite time synchronization is described in detail, the synchronization error is analyzed and evaluated from the establishment and maintenance of time synchronization, and the effect of time synchronization error is analyzed systematically, The result of ground test and in-orbit test show that the analysis and evaluation conclusion is reliable.