现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
8期
12-15
,共4页
载波捕获跟踪%高动态%低信噪比%锁频环%锁相环
載波捕穫跟蹤%高動態%低信譟比%鎖頻環%鎖相環
재파포획근종%고동태%저신조비%쇄빈배%쇄상배
carrier capture and tracking%high dynamic state%low signal-to-noise ratio%frequency locked loop%phase locked loop
为了研究高动态低信噪比下信标信号的载波捕获跟踪问题，采用两级二阶锁频环（FLL）和一级三阶锁相环（PLL）技术方案。FLL采用基于周期图的鉴频方法，实现极低信噪比下信号载波的捕获。PLL中的三阶锁相环通过对环路压控振荡器（VCO）的输入控制信号进行监测，自适应地调整环路滤波器的带宽，以满足高动态下信号载波频率动态范围大的要求。在基于FPGA构建的信号处理板上验证了上述实现方案，并给出实验结果。
為瞭研究高動態低信譟比下信標信號的載波捕穫跟蹤問題，採用兩級二階鎖頻環（FLL）和一級三階鎖相環（PLL）技術方案。FLL採用基于週期圖的鑒頻方法，實現極低信譟比下信號載波的捕穫。PLL中的三階鎖相環通過對環路壓控振盪器（VCO）的輸入控製信號進行鑑測，自適應地調整環路濾波器的帶寬，以滿足高動態下信號載波頻率動態範圍大的要求。在基于FPGA構建的信號處理闆上驗證瞭上述實現方案，併給齣實驗結果。
위료연구고동태저신조비하신표신호적재파포획근종문제，채용량급이계쇄빈배（FLL）화일급삼계쇄상배（PLL）기술방안。FLL채용기우주기도적감빈방법，실현겁저신조비하신호재파적포획。PLL중적삼계쇄상배통과대배로압공진탕기（VCO）적수입공제신호진행감측，자괄응지조정배로려파기적대관，이만족고동태하신호재파빈솔동태범위대적요구。재기우FPGA구건적신호처리판상험증료상술실현방안，병급출실험결과。
To capture and track the signal’s carrier in high dynamic and low signal?to?noise ratio(SNR)environment,the schemes of frequency locked loop(FLL)with two factorials add phase locked loop(PLL)with three factorials are proposed in this article. To solve the low SNR problem,the frequency discrimination method based on periodogram is used in FLL to realize signal’s carrier capture under very low SNR. The three?order PLL is monitored by the input control signal of the voltage con?trolled oscillator(VCO)to adjust the band width of loop filter self?adaptively,so as to meet the requirement of large dynamic range of signal carrier frequency in high dynamic state. The proposed scheme was verified on a signal processing board with FPGAs. The experimental results are presented at last.
