CAJ | 학술논문

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2.2W,发射功率为26dBm,可满足轨道高度小于1000km的低轨微小卫星的测控需求。
설계병실현료일충신형괄용우미소위성적소형화、저공모S파단발사궤결구。해결구이용료DAC수출적경상신호,용교저적처리속솔산생비채양시종빈솔경고적중빈신호,실현일차혼빈장하행신호반이도발사빈솔상,유효지감소료발사궤적면적급공모。발사궤재일괴인제전로판상실현,실제측시공모약위2.2W,발사공솔위26dBm,가만족궤도고도소우1000km적저궤미소위성적측공수구。
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.