| 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。 |
| 关键词: 海事卫星 上行信号；测向；相关干涉仪；插值算法 |
| DOI： |
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| Engineering implementation of direction-finding for Inmarsat satellite uplink signals |
| ZOU Zhou |
| () |
| Abstract: |
| According to the character of Inmarsat satellite signal and based on correlation interferometer direction-finding(DF) algorithm，this paper proposes an engineering implementation scheme of DF for Inmarsat 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 Inmarsat 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 algorithm.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. |
| Key words: Inmarsat satellite uplink signal direction-finding correlation interferometer interpolation algorithm |
《电讯技术》编辑部 