一种低带外辐射高可靠星载调制器的设计与实现

Design and Achievement of High Reliable and Low Sidelobe On-board Modulator

随着卫星技术的发展,星载调制器的调制方式须满足带外辐射小、频带利用率高且可靠性高的需求。介绍了Actel公司的RTAX系列高可靠性FPGA的特点,分析了GMSK调制信号的特点,给出了基于反熔丝FPGA的硬件及软件实现方案。软件综合结果表明本方案实现简单、占用资源少,布线后时钟速率达到158 MHz。在工业级反熔丝FPGA的硬件平台上进行GMSK基带信号和射频频谱的测试,结果表明实测波形与仿真结果一致。

With the development of the satellite technique, the ways of satellite modulator must satisfy the requirements which include the smaller radiation and the higher performance of bandwidth and the higher reliability. The specification of the RTAX series FPGA produced in the ACTEL company is introduced. The signal performance of the GMSK modulator is analyzed. The ways of hardware and software based on the antifuse FPGA are proposed. The software synthesis results indi-cate that the way is conducted easily and the consumed FPGA resource is reduced. The rate of clock after routing can even reach 158 MHz. The baseband signal and the modulated signal of GMSK are tested on the hardware platform based on the in-dustrial antifuse FPGA. It is indicated that the tested waveform is in accordance with the result of simulation.