【摘要】 随着我国载人航天工程进入交会对接阶段,为完成多目标的测控通信,在有限的S频段测控频率范围内需要分配近十个下行工作频点,给地面S频段微波统一测控系统(USB)的适应性提出较高的要求。本文根据USB设备的基本工作原理,分析其产生乱真响应的机理,给出了避免产生乱真响应一中频选择的限制条件。更多还原

【Abstract】 With China’s manned space project into the rendezvous and docking stage,for the completion of multiple targets’ tracking and communication,nearly ten downlink frequencies need to be allocated in a limited S band TT&C frequency range.So the highly adaptability of the ground S band unified TT&C(USB) system is required.In this paper,according to the principle of USB system,the spurious response mechanism is analyzed,and selection constraints of the intermediate frequency(IF) for the USB receiver is given to avoid spurious response.更多还原