某Ku频段卫星通信系统的设计

为了让两个地面站通过卫星链路进行无线通信，设计了一个Ku频段卫星通信系统 ，数据速率是512 kbit/s～4.096 Mbit/s，速率可调步进1 bit/s。选取了一 种较简洁的Ku频段地面 站设计方案，信道的本振为固定点频，调制解调器的中频范围是950～1 450 MHz。对卫 星通信 链 路功率进行了预算。地面站的组成设备，如调制解调器、低噪声放大器、上变频单元、下变 频单元等均选用成熟的商用货架产品，降低了设计风险和成本。本系统研制周期短，通信稳 定可靠，得到了用户的认可。

Design of a Ku band satellite communications system

To realize communication between two ground stations via satellite wireless link,a Ku band satellite communications system is designed.The data rate range is 512 kbit/s ～4.096 Mbit/s in 1 bit/s step.A relatively simple design is selected for the ground station.The local oscillator(LO) of channel has a fixed frequency synthesizer.The intermediate frequency(IF) range of modem is 950 ～1 450 MHz.Satellite link power is budgeted.The ground station is composed of modem,low noise amplifier(LNA),block up converters(BUCs),block down converters(BDCs),which are off-the-shelf products so that the design risk and cost is reduced.The communication system is featured by short development cycle,stable and reliable communication.It has been authorized by users.