摘要
结合海事卫星信号的信号特征,以相关干涉仪测向算法为基础,提出了一种海事卫星上行信号测向的工程实现方法,在一片FPGA中完成数字下变频、FFT实时运算、相位差计算等复杂运算,在一片DSP中完成相关干涉仪方位计算。与以往的方法相比,该方法解决了对海事卫星上行信号测向的问题,频率分辨率被提高到5.7 kHz;通过降低相位差的波动度和插值提高了方位的稳定度和精度;采取在DSP中完成方位计算的方式减少了FPGA器件数量。最后,试验结果验证了所提方案的实用性。
According to the character of Inmarsat satellite signal and based on correlation interferometer di-rection-finding（DF） algorithm,this paper proposes an engineering implementation scheme of DF for In-marsat satellite uplink signals in which the complex calculations such as signals digital down conversion, FFT real-time seperation,phase difference computation are realized in an FPGA and calculation of azimuth in a DSP. Comparison with traditional scheme shows the proposed scheme solves the problem of DF for In-marsat satellite uplink signals,the frequency resolution is increased to 5. 7 kHz. Accuracy and stabilization of azimuth is improved through decreasing fluctuation of phase difference and applying interpolation algo-rithm. Calculation of azimuth is achieved in the DSP to reduce the number of FPGA components. Finally, the feasibility of the scheme is verified by test.
出处
《电讯技术》
北大核心
2014年第7期921-925,共5页
Telecommunication Engineering
关键词
海事卫星
上行信号
测向
相关干涉仪
插值算法
Inmarsat satellite
uplink signal
direction-finding
correlation interferometer
interpolation algorithm
