【作者】 孟升卫；

【导师】 付平；

【作者基本信息】 哈尔滨工业大学 ， 仪器科学与技术， 2007， 博士

【摘要】 时间间隔测量是信号周期、频率和相位等物理量测量的基础,连续时间间隔测量是调制域测量必需的技术手段。随着科技的飞速发展,在调制域测量中,被测信号频率不断提高,为了适应目前高频信号的测试需求,必须深入研究时间间隔测量技术,进一步提高时间间隔测量分辨率和测量速度。另外,时间间隔的高速精密测量在原子物理、天文实验、航空航天和遥测遥控等高科技领域也得到了广泛应用。时间间隔测量分辨率和速度的提高会促进许多高科技和先进工艺水平进一步提高,从而促进国民经济的发展。本文系统综述了时间间隔测量技术的发展概况,阐述了时间间隔测量理论。针对调制域测量技术中高速、高分辨、无间隔计数等特性,以提高连续测时分辨率为目的,对连续高速同步计数问题和时间内插问题进行了深入研究。在高速同步计数器方面,分析了三种不同逻辑运算深度的计数器结构;改进了无间隔计数器的设计;提出了Systolic型非二进制同步计数器输出编码修正算法。在时间内插方面,为了减小内插保障时间提出了多斜时间内插方法,并提出了双游标、流水线式及游标时钟数字移相三种游标内插方法;针对事件信号在无源延迟单元组成的延迟链中衰减特性,提出了反馈型延迟内插方法。在高速连续测时技术应用方面,研制了VXI总线时间间隔分析模块;提出了动态相位补偿技术以提高同步串行通讯性能。本文主要的创新性研究成果如下:1.针对级联的二进制同步计数器最大计数频率随着计数器级联位数增多而降低的问题,本文从同余理论出发,提出了模数互质的并联计数器组模型,根据中国剩余定理,推导了并联计数器组的有效计数值公式。在并联计数器组中各因子计数器独立计数,最大计数频率与位数无关。通过有效计数值公式,可将因子计数器的计数值转换为计数器组的有效计数值。为了验证模型的有效性,分别以环形计数器和中规模集成电路二进制计数器作为因子计数器,进行了仿真与实际电路实验。2.针对高分辨延迟内插技术中延迟单元的数目多、延时短的问题,本文提出了事件与时基双延迟内插方法。该方法对事件信号和时基信号分别采用不同的延迟单元进行延迟,在满足给定的约束条件时,内插测时分辨率为两种不同延迟单元的延时差,在不增加延迟单元的情况下,提高了测时分辨率。利用Modelsim仿真软件对该方法进行了仿真验证。3.针对目前超声波测距技术测距精度低的问题,本文以FSK调制的超声波作为发射波,采用调制域测量技术对回波瞬时频率进行测量,可对回波前沿进行精确定位,提高测距精度,并对该方法进行了实验验证。更多还原

【Abstract】 Time interval measurement is the measurement basis of many physicalvariables such as period, frequency and phase. And continuous time intervalmeasurement is also the essentialtechnique for modulation domain measurement.With the development of science and technology, the frequency of the signalunder measurement in themodulation domain measurement raises rapidly, whichmakes the further research on the time interval measurement necessary. Theresearch aims at improving the resolution and speed of time intervalmeasurement. Moreover high-speed precise time interval measurement is widelyapplied to atomic physics, astronomy experiments, aviation and spaceflight, andremote sensing and control, so the improvement of time interval measurementcan accelerate the development in these fields and promote the development ofeconomy.Thisdissertation systematicallysummarizes the current achievement and thefundamental theory of time interval measurement. To improve the resolution oftime interval measurement, it researches on the continuous high-speedsynchronous counter and the time interpolation technologyfor the characteristicsin modulation domain measurement, such as the high-speed and high resolution,and zero-dead-time. In the high-speed synchronous counter aspect, thedissertation analyzes the logic operation depth of three types of counters, andthen proposes the improved zero-dead-time counter design and proposes anamendment coding scheme for the non-binary Systolic counter. In the timeinterpolation aspect, a multi-slope time interpolation method to eliminate theblind measurementspot is presented, and threetypes of vernier time interpolationare also proposed, including dual-vernier interpolation, pipeline interpolation anddigital clock phase shifting interpolation. In addition, a feedback delayinterpolation is proposed according to the attenuation of the event signal in thedelay chain that is composed of passive delay units. In the application of highspeed continuous time measurement, a VXIbus time interval analyzer isdevelopped and the dynamic phase compensation is proposed to improve theperformance of the synchronous serial communication. The major innovative contributions of this dissertation are as follows:1. The binary counters’maximum working frequency reduces as the bitsincrease. To solve the problem, a parallel synchronous counter group modelwiththe relatively prime divisors is proposed according to the reminder theory. Thereminder theory is adopted to derive the formula calculating the parallel countergroup’s counting value. The counters in the group work independently and themaximum working frequencies have no relationship with the bits. With thederived formula, the real counting value can be obtained according to thecounters’value. The formula’s validity is examined by experiments of the ringcounters and the medium-scaleintegration counters.2. In the delay time interpolation with high resolution, the number of thedelay units is big and the delay time is short. To solve the two problems, thedissertation presents the event and time-base delay method that delay the eventsignal and the time-base through different delay units. When the restrictioncondition is fulfilled, the time interpolation resolution is the difference betweenthe two delay units’delay time and the time measurement resolution improveswithout adding additional delay units. The method is tested by Modelsimsimulation.3. To improve the precision in the ultrasonic distance measurement, thedissertation presents a method of embedding the frequency characteristic into theecho leading edge that takes the FSK ultrasonic as transmitting wave and adoptsthe modulation domain measurement to get the real frequency of the echo. Themethod can precisely position the echo edge and improve the precision of thedistance measurement.The method is tested with experiments.更多还原