太阳射电800～975 MHz波段高动态范围模拟接收机的研制

Design of a High Dynamic Range Analog Receiver for Solar Radio Observation in 800MHz- 975MHz

介绍了云南天文台10m太阳射电望远镜800～975 MHz模拟接收机的研制.接收系统采用射频-中频两级放大＋远程控制步进衰减器模式,能方便地通过远程界面控制射频或中频链路的增益倍数,使得整个接收机动态范围在-35 dB-＋25 dB.这样的设计防止在该频段强RFI信号造成的接收机饱和,并且获得了大动态范围,能够满足强射电爆发的要求,弥补了10r射电望远镜的缺省频段.

In this paper we introduce the design of a high dynamic range analog receiver for solar radio observation in 800MHz-975MHz. The receiver is installed on the 10 meter solar radio telescope of the Yunnan Observatory. In the receiver system we adopt the RF-IF （Radio Frequency-Intermediate Frequency） two-stage amplification and step attenuators in a remote control mode. This allows us to easily control the gains of RF parts and IF parts of the system and to retrieve real-time gain values. The dynamic range of this receiver is from -30dB to ＋25dB. Because of its high dynamic range the receiver system not only avoids any overflow inducted by strong Radio Frequency Interferences （including communication signals）, but also meets the conditions for observation of strong solar radio bursts, whose signals are usually thousands of times stronger than quiet-time signals.