摘要
设计并实现了一种新型适用于微小卫星的小型化、低功耗S波段发射机结构。该结构利用了DAC输出的镜像信号,用较低的处理速率产生比采样时钟频率更高的中频信号,实现一次混频将下行信号搬移到发射频率上,有效地减小了发射机的面积及功耗。发射机在一块印制电路板上实现,实际测试功耗约为2.2 W,发射功率为26 dBm,可满足轨道高度小于1 000km的低轨微小卫星的测控需求。
A new S-band transmitter structure with small volume and low-power consumption is presented for LEO micro-satellite applications.Due to the use of the image frequency of the DAC,the IF signal of higher frequency is generated with a relatively low processing rate.In this way,the downlink signal is moved to the transmitting frequency with one mixing stage,thus effectively reducing the transmitter＇s volume and power consumption.The transmitter was implemented on a printed circuit board,and the test results showed that a transmit power of 26 dBm and a power consumption of only 2.2 W are achieved.The transmitter can be used in micro-satellites in orbits lower than 1 000 km.
出处
《传感技术学报》
CAS
CSCD
北大核心
2013年第8期1168-1172,共5页
Chinese Journal of Sensors and Actuators
关键词
测控应答机
直接上变频
镜像频率
发射机
transponder
direct-up conversion
image frequency
transmitter
