现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
19期
75-78
,共4页
北斗%捕获系统%FFT%并行频率搜索
北鬥%捕穫繫統%FFT%併行頻率搜索
북두%포획계통%FFT%병행빈솔수색
Compass%acquisition system%FFT%parallel frequency searching
采用FFT并行频率搜索的北斗二代卫星信号捕获算法，分析了并行频率捕获原理，利用Matlab对设计的捕获模型进行仿真，通过对比分析得到不同的FFT点数、子相关器个数及抽头设置等参数设置对捕获速度、频率搜索范围及灵敏度等性能的影响。在实际设计中考虑到资源消耗和性能的平衡，给出改进后的捕获系统的FPGA实现方案。改进传统的相关器结构，采用同一相关器分段积分方式模拟多个子相关器，减少硬件资源开销，提高了相关器使用效率。
採用FFT併行頻率搜索的北鬥二代衛星信號捕穫算法，分析瞭併行頻率捕穫原理，利用Matlab對設計的捕穫模型進行倣真，通過對比分析得到不同的FFT點數、子相關器箇數及抽頭設置等參數設置對捕穫速度、頻率搜索範圍及靈敏度等性能的影響。在實際設計中攷慮到資源消耗和性能的平衡，給齣改進後的捕穫繫統的FPGA實現方案。改進傳統的相關器結構，採用同一相關器分段積分方式模擬多箇子相關器，減少硬件資源開銷，提高瞭相關器使用效率。
채용FFT병행빈솔수색적북두이대위성신호포획산법，분석료병행빈솔포획원리，이용Matlab대설계적포획모형진행방진，통과대비분석득도불동적FFT점수、자상관기개수급추두설치등삼수설치대포획속도、빈솔수색범위급령민도등성능적영향。재실제설계중고필도자원소모화성능적평형，급출개진후적포획계통적FPGA실현방안。개진전통적상관기결구，채용동일상관기분단적분방식모의다개자상관기，감소경건자원개소，제고료상관기사용효솔。
The principle of parallel frequency acquisition is analyzed with Compass-2 satellite signal acquisition algorithm of FFT parallel frequency search. The designed acquisition model was simulated with Matlab. The influence of the different pa-rameter settings of FFT spot number,sub-correlator number and tapping winning on acquisition speed,frequency search range and sensitivity performance were obtained by comparison and analysis. The balance of resource consumption and performance were considered in the actual design. The FPGA implementation scheme of the improved acquire system is given in this paper. Structure of the traditional correlator was improved,in which the multiple sub-correlators are simulated with the subsection inte-gral mode of a same correlator to reduce the spending of hardware resource and improve the efficiency of the correlator.
