电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2014年
7期
61-65
,共5页
海事卫星%上行信号%测向%相关干涉仪%插值算法
海事衛星%上行信號%測嚮%相關榦涉儀%插值算法
해사위성%상행신호%측향%상관간섭의%삽치산법
Inmarsat satellite%uplink signal%direction-finding%correlation interferometer%interpolation algorithm
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。
結閤海事衛星信號的信號特徵，以相關榦涉儀測嚮算法為基礎，提齣瞭一種海事衛星上行信號測嚮的工程實現方法，在一片 FPGA 中完成數字下變頻、FFT 實時運算、相位差計算等複雜運算，在一片DSP 中完成相關榦涉儀方位計算。與以往的方法相比，該方法解決瞭對海事衛星上行信號測嚮的問題，頻率分辨率被提高到5.7 kHz；通過降低相位差的波動度和插值提高瞭方位的穩定度和精度；採取在 DSP 中完成方位計算的方式減少瞭 FPGA 器件數量。最後，試驗結果驗證瞭所提方案的實用性。
결합해사위성신호적신호특정，이상관간섭의측향산법위기출，제출료일충해사위성상행신호측향적공정실현방법，재일편 FPGA 중완성수자하변빈、FFT 실시운산、상위차계산등복잡운산，재일편DSP 중완성상관간섭의방위계산。여이왕적방법상비，해방법해결료대해사위성상행신호측향적문제，빈솔분변솔피제고도5.7 kHz；통과강저상위차적파동도화삽치제고료방위적은정도화정도；채취재 DSP 중완성방위계산적방식감소료 FPGA 기건수량。최후，시험결과험증료소제방안적실용성。
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.
