| 摘要: |
| 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。 |
| 关键词: 卫星通信 链路功率预算 低噪声放大器 上变频单元 下变频
单元 |
| DOI： |
|
| 基金项目: |
|
| Design of a Ku band satellite communications system |
| LI Ji-chao |
| () |
| Abstract: |
| To realize communication between two ground stations via
satellite wireless link,a Ku band satellite communications sys
tem 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 oscilla
tor(LO) of channel has a fixed frequen
cy 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 conv
erter
s(BUCs)，block down converters(BDCs),which are off-the-shelf products so that th
e design ris
k and cost is reduced.The communica
tion system is featured by short development cycle,sta
ble and reliable communication.It has been authorized by users. |
| Key words: satellite communications link power budget low noise amplifier（LNA） block u
p converters(BUC) block down converters(BDC) |
