频域匹配滤波-FFT联合捕获算法
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摘要
频域匹配滤波法利用FFT-IFFT完成时域伪码的快速相关,提出频域匹配滤波-FFT联合捕获法,该方法在频域匹配滤波法的基础上对相关结果进行二次FFT运算。通过仿真结果可知,在相同条件下得到的相关峰值高于频域匹配滤波法的相关峰值,提高了多普勒频率的估计精度,在信噪比大于-14 dB时捕获概率能达到0.988。由此可见,频域匹配滤波-FFT联合捕获法在估计精度和捕获概率上优于传统的频域匹配滤波法。
In the acquisition algorithm based on frequency domain matching filter,the correlation of PN code is accomplished by FFT/IFFT. A new acquisition method based on frequency domain matching filter and FFT is presented. In this algorithm,the correlation results of PN code in the same phase are the inputs of the second FFT. Simulation result shows that correlation peak value in the new algorithm is higher than that in the common acquisition algorithm. The estimated precision is increased and the acquisition probability could be 0. 988 when the SNR is-14 dB.
In the acquisition algorithm based on frequency domain matching filter,the correlation of PN code is accomplished by FFT/IFFT. A new acquisition method based on frequency domain matching filter and FFT is presented. In this algorithm,the correlation results of PN code in the same phase are the inputs of the second FFT. Simulation result shows that correlation peak value in the new algorithm is higher than that in the common acquisition algorithm. The estimated precision is increased and the acquisition probability could be 0. 988 when the SNR is-14 dB.
引文
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[3]金俊坤,吴嗣亮,李菊.基于基2-FFT的伪码快速捕获实现新算法[J].系统工程与电子技术,2005,27(11):1957-1960.JIN Jun-kun,WU Si-liang,LI Ju.Implementation of A New Fast PN Code-Acquisition Using Radix-2 FFT[J].Systems Engineering and Electronics,2005,27(11):1957-1960.
[4]胡建波,杨莘元,卢满宏.一种基于FFT的高动态扩频信号的快速捕获方法[J].遥测技术,2004,25(6):19-24.HU Jian-bo,YANG Xin-yuan,LU Man-hong.An FFT Based Method for Fast Acquisition of High Dynamic DS Spread Spectrum Signals[J].Telemetry&Telecontrol,2004,25(6):19-24.
[5]国世超,陈安乐,韩方剑.基于部分匹配滤波的伪码捕获方法研究[J].电子信息对抗技术,2010,25(2):20-23.GUO Shi-chao,CHEN An-le,HAN Fang-jian.PseudoNoise Code Acquisition Method Based on Partial Matched Filter[J].Electronic Information Warfare Technology,2010,25(2):20-23.
[6]黄振,陆建华,杨士中.基于DMF直扩系统捕获性能研究[J].电路与系统学报,2002,7(1):92-95.HUANG Zhen,LU Jian-hua,YANG Shi-zhong.Performance of Acquisition in a Matched-Ffilter for DSSS[J].Journal of Circuits and Systems,2002,7(1):92-95.
[7]黄磊,张其善,寇艳红.基于差分码和块处理方法的GPS信号快速捕获算法[J].通信学报,2006,27(8):14-19.HUANG Lei,ZHANG Qi-shan,KOU Yan-hong.GPS Signal Fast Acquisition Algorithm Using Differential Code and Block Processing Techniques[J].Journal on Communications,2006,27(8):14-19.
[8]LIN D,TSUI J.Comparison of Acquisition Methods for Software GPS Receiver[J].Ion GPS,2002,91(5):2385-2390.
[9]LEE Yong-hwan,TANTARATANA S.Sequential Acquisition of PN Sequences for DS/SS Communications:Design and Performance[J].IEEE Journal on Select Areas in Communications,1992,10(4):750-759.
[10]TANIGAWA M,HARA T,FUKUI M,et al.Fast Acquisition and Low Correlation Multi-Component Code[J].IEEE Transactions on Communications,2004,4(1):2454-2457.
[11]FENG G.Block Processing Techniques for the Global Positioning System[D].Ohio:Ohio University,2003.
[12]ZHU Z.Averaging Correlation for Weak Global Positioning System Signal Processing[D].Ohio:Ohio University,2002.
[13]STARZYK J A,ZHU Z.Averaging Correlation for C/A code Acquisition and Tracking in Frequency Domain[J].MWSCS Conf,2001,12(15):24-28.
[14]IUNTA G,BENEDETTO F.Spread-Spectrum Code Acquisition in The Presence of Cell Correlation[J].IEEE Transactions on Communications,2007,55(2):257-261.
[15]JARI H,IINATTI J.On the Threshold Setting Principles in Code Acquisition of DS-SS Signals[J].IEEE Journal on Selected Areas in Communications,2000,8(1):62-72.
[16]SIMON M K,OMURA J K,Scholtz R A,et al.Spread Spectrum Communication Handbook[M].Beijing:Post&Telecommunications Press,2002.