track vt. 用纤拉船。 vi. 拉纤行驶。 n. -age 拉纤。 n. -er 拉纤的人。 n. 1.轨迹,轮迹,航迹,痕迹;〔pl.〕足迹。 2.小路,小径;【物理学】径迹;历程,路程;行程;行动路线;思路。 3.(阴谋等的)形迹,线索;跟踪目标;导向装置。 4.【运】跑道;径赛[田赛]运动;〔美国〕铁道路线,轨道;(录音磁带的)音轨;【机械工程】履带,环带;跨距;(两轮间的)轮距;【地质学;地理学】开合脉。 the beaten track 踏出来的路;常规,惯例。 a single [double] track 单[双]轨。 clear the track 让路;〔命令〕走开! 让开! cover (up) one's tracks 隐匿行踪;隐藏自己的企图[计划等]。 in one's tracks 〔俚语〕就在那里,就那样;〔美国〕当场;立刻。 in the track of 仿…的例,学…的样;在…的中途,正在…。 jump [leave] the track 〔美国〕出轨。 keep track of 追踪;记录;保持联系;密切注意…的动向。 lay tracks 铺轨。 lose track of 〔比喻〕忘记,失去联系。 make tracks 走开;跑掉,逃走;追 (for)。 off the track 出轨;出岔子;(话)离题;(猎狗)失去嗅迹,失去(犯人的)线索。 on the track of 跟踪追赶,尾追;没有出轨;未出岔子;话未离题;得到…的线索。 put sb. on the track of 使追踪。 throw off the track 摆脱(追踪者)。 vt. 跟踪追赶 (down) 踏成(道路);践踏,踏脏,踏平(等);通过(荒漠);铺设铁路;顺着走(旧辙);探索 (out) 拖(船)。 vi. 追踪;留下行迹;铺设铁路[铁轨];(车)顺着一定线路走;(车轮)具有一定轮距;〔美口〕走小路,前进;(船)被拖着走。 track mud through a house 踏得一屋子泥。 -age 拖船;〔集合词〕轨道;铁道路线;铁道路线全长里数;铁道使用权[使用费]。 n. -er 追踪者;【无线电】跟踪系统;跟踪器;【军事】跟踪标定仪;搜索者;纤夫。 n. -ing 跟踪,跟踪目标;【电影】跟踪摄影 (aided [automatic] tracking 半自动[自动]跟踪)。
Study on a new type of digital coding track circuit 一种新型的数字编码轨道电路
Coded track circuit 编码轨道电路
Because multipath searcher and code tracking are accomplished on the hardware , the complexity of the circuit should be concerned 同时由于多径搜索和同步跟踪是在硬件上进行处理,实现电路的复杂度也需要考虑。
The parallel scheme based on sliding correlation method is proposed in the simulation of acquisition . baseband fully time delay - locked pn code tracking loops are employed in tracking simulation 在对完全互补码捕获的仿真中,本文提出了基于滑动相关法的并行捕获实现方案。
Synchronization technique of spread spectrum code is utilized in two stages . multipath searcher coarsely estimates the pn code phase and code tracking confirm the pn code phase precisely 这需要采用扩频系统中扩频码同步技术,即:多径搜索粗略地估计pn码相位,同步跟踪精确确定pn码相位。
Based on experiments , a 24 - bits absolute photoelectric rotary encoder is presented in this paper . it ' s advantages lie in : 1 . it has a system for thick code tracks to automatically compensate ; 2 本文研究的是24位绝对式光电轴角编码器,此编码器在结构设计上与传统的编码器的不同之处在于: 1 )粗码道光强的自动补偿系统。
First , we classify the multipath mitigation techniques into four categories , and then the presentation of principles and simulation of performances are done of three widely - used techniques of multipath mitigation , which are based on the code tracking loop with the name of narrow - correlator - spacing technique 、 els ( early late slope ) technique and medll technique . from the presentation and simulation , the medll technique is selected as the multipath mitigation algorithm in signal processing ’ s scope . 本章首先对多径消除技术进行了分类,然后主要对基于码跟踪环路的三种技术-窄相关( narrowcorrelatorspacing )技术、 els ( earlylateslope )技术和medll ( multipathestimatingdelaylockloop )技术-进行原理分析和性能仿真,从中选择medll技术作为接收机信号处理阶段的多径消除算法。
And the pn code tracking scheme adequate for the wcdma uplink is presented and combined with the mulipath acquisition and channel estimation algorithms to complete the rake receiver scheme . computer simulations show the tracking scheme meets the requirement of wcdma uplink in 3gpp protocols and has good performance 通过大量的计算机仿真和验证,证明本论文提出的同步跟踪方案完全能达到3gpp协议对上行链路接收机的要求,具有较好的性能,同时指出进一步研究和提高的思路。
Multipath acquisition decide the coarse pn code phase and pick up the available multipath components . following , code tracking confirm the pn code phase precisely and track every multipath component ' s delay drifting due to doppler effect . in this paper , the code tracking technique in spread spectrum communication is introduced 本论文首先介绍了在扩频通信中采用的同步跟踪技术,结合wcdma上行链路的特点,提出了适合wcdma上行链路的pn码跟踪方案,并与现有的多径搜索和信道估计算法构成完整的上行链路rake接收机方案。
This article focuses on the study of workshop level ' s management reform based on the factory level production management system , to accomplish the process standardization and automatization of workshop work planning management , workshop work management , vehicle vin bar code tracking management , and workshop resources management and control , to finally accomplish the goal to use information technology to support production management modernization 本文着重研究,在工厂级的生产管理系统的基础上向下延伸,着重于车间级管理上进行改革,实现车间作业计划管理、车间作业管理、汽车vin条码追踪管理、车间资源管理与控制的流程化、自动化,达到以信息化支持生产管理模式现代化的目的。