一种新型星载QPSK调制模块的设计

Design of a New Spaceborne QPSK Modulation Module

调制模块是光学遥感卫星、微波遥感卫星及载人航天数据传输系统中必不可少的一部分,同时QPSK调制也是星载输出传输系统中最常用的调制方式。文章介绍的新型QPSK调制模块创新点在于:1)使用微带到槽线的过渡结构实现巴伦的功能及调制的功能,使调制模块达到更优的幅相指标;2)采用基带数据通过微带线通孔传输数据的方式代替金带压焊的方式,避免了金带压焊环节带来的人为风险;3)采用1/4波长电桥的设计方法替代Lange桥实现载波相位相差90°功分的功能,解决了Lange桥电装过程中金带压焊困难的问题。在设计过程中,采用场路联合的仿真设计方法,从阻抗匹配和场模式两方面对该结构进行了分析,应用Advanced Design System和Computer Simulation Technology联合仿真对电性能进行仿真优化,实现了QPSK调制电路良好的幅相特性和匹配特性。目前,该创新型设计方法已应用于工程化的调制模块设计中,在提升调制模块模块的性能的同时降低了生产制造难度。

The modulation module is an indispensable part of optical remote sensing satellite,microwave remote sensing satellite and manned space data transmission system,and QPSK modulation is also the most commonly used modulation mode in spaceborne output transmission system.The article introduces the new QPSK modulation module innovation point lies in:1)using the transmission of microstrip to slot structure to realize the balance of function and function of the modulation,the index of phase modulation module to achieve better.2)uses the baseband data through the way of microstrip transmission line hole data instead of the gold belt bonding ways to avoid the gold belt bonding segment of man-maned risks.3)use 1/4 wavelength bridge design method instead of Lange bridge to achieve carrier phase difference of 90°.Solve the problem of pressure welding of gold strip in the process of Lange BridgeS.In this process of design,the structure was analyzed by the combination of field and path,and the amplitude and phase characteristics of QPSK modulation circuit were realized by the combination of Advanced Design System and Computer Simulation Technology.wo At present,this innovative design method has been applied in the modulator design of engineering,which not only improves the performance of modulation module,but also reduces the manufacturing difficulty.