一種消除hangup現(xiàn)象的數(shù)字相位跟蹤環(huán)
A NOVEL DIGITAL PHASE-TRACKING LOOP ELIMINATING HANGUP EFFECT
-
摘要: 為實(shí)現(xiàn)對輸入信號相位的快速捕捉,提出了一種有效消除高信噪比下hangup現(xiàn)象的數(shù)字相位跟蹤環(huán)(DPTL)并應(yīng)用有限狀態(tài)Markov鏈理論求解其響應(yīng)時(shí)間。計(jì)算和仿真結(jié)果均表明,環(huán)路克服了hangup效應(yīng),比常規(guī)采用死區(qū)(dead zone)量化器的過零采樣數(shù)字鎖相環(huán)(ZC-DPLL)具有更短的穩(wěn)定時(shí)間。該DPTL可應(yīng)用于測距等接收信號頻率已知的場合。
-
關(guān)鍵詞:
- 相位跟蹤環(huán); 相位捕捉; Markov鏈; 測距
Abstract: A novel Digital Phase-Tracking Loop(DPTL) thoroughly eliminating hangup effect in high SNR is proposed to fulfil fast phase acquisition. The theory of finite Markov chains is utilized to evaluate the phase acquisition time in the presence of additive band-limited white Gaussian noise. Both of the calculated and simulated results indicate that the hangup effect leading to prolonged phase transients owing to the presence of the dead zone around rad is effectively removed so phase acquisition time of the described DPTL is much shorter than that of the conventional zero-crossing DPLL utilizing a dead zone quantizer. The DPTL can be used in such applications as distance measurement where the frequency of the received signal is known, -
F.M. Gardner, Hangup in phase-locked loops, IEEE Trans. on Commun., 1980, COM-25(10),1210-14.[2]N.A. DAndrea, et al, Multilevel quantized DPLL behavior with phase-and frequency-step plus noise input, IEEE Trans. on Commun., 1980, COM-28(8), 1373-1382.[3]M.P. Fitz, et al, A performance analysis of a digital PLL based MPSK demodulator, IEEE Trans.on Commun., 1995, COM-43(2/3/4), 1192-1201.[4]H. Meyr, L. Popken, Phase acquisition statistics for phase-locked loops, IEEE Trans. on Commun., 1980, COM-28(8), 1365 72.[5]J.G. Kemeny, et al, Finite Markov Chains, Princeton, NJ, D. Van Nostrand Com. Inc., 1960,chapt. 3. ［6］Feng Zhenghe, Huang Jingyu, Chen Yaqin, et al, A novel narrow-bandwidth high-accuracy ranging system for weather balloon, Proc. of ICMMT2000, Beijing, 2000, 553-556. -
計(jì)量
- 文章訪問數(shù): 2078
- HTML全文瀏覽量: 92
- PDF下載量: 493
- 被引次數(shù): 0
下載:
