摘要
为配合中频数字角跟踪接收机的研制,需要一个既能够产生角误差信号,又能够模拟多普勒、多普勒变化率等动态特性的中频模拟源。利用FPGA和AD9957硬件平台,采用基带载波控制的方式产生多普勒频移和多普勒频移变化率,设计了一个多调制体制、多带宽的信号模拟源。通过测试并与实际跟踪数据进行比对验证,表明该设计合理,模拟出的高动态特性与真实信号的动态特性一致。
For the purpose of testing the performances of tracking and receiving systems,a signal simulator is required to emulate the real signals under all kinds of conditions.In the paper,the implementation of carrier＇s Doppler frequency bias is discussed,and the module of Doppler and quadrature modulation are designed.The results of hardware test and the validation with real satellite signal show that the Doppler characteristics of dynamic simulation accord with that of the real satellite signal.It is proved that the design is feasible.
出处
《信息与电子工程》
2012年第2期129-132,142,共5页
information and electronic engineering
