直捕接收机中实时时钟电路的设计与实现

发布时间：2019-05-14 05:36

【摘要】：随着现代化军事战争对卫星导航定位的迫切需求和国民经济对导航定位的日趋依赖,卫星导航定位已成为现代社会不可缺少的重要组成部分。然而,导航P码直接捕获、跟踪的关键是确定起始捕获时刻,起始时刻越精确,捕获时间越短,捕获过程越简易。因此,研究和实现一种高精度守时芯片对于提高导航P码直捕有着重要的意义。本文设计用于导航手持终端的实时时钟电路不仅具有常规计时功能,而且支持I2C总线,具有电源管理能力,能够实现外部基准时间信号校时功能。芯片设计主要从电路整体架构、守时算法优化、管壳订制以及批量调测系统等四个方面进行,将芯片结构划分模块设计,最终围绕“温度传感器+ADC+EEPROM+DAC”补偿架构,同时兼顾低功耗与高精度的指标要求,通过反复优化与改进,逐步达到了最终的高守时精度,经过实际测试,实时时钟电路全部性能指标均满足预期要求,其中守时精度能够达到国际领先水平。针对实时时钟电路生产调试过程,开发了批量调测系统,实现芯片自动调试、自动获取采样温度点补偿值、自动存储生产过程数据及处理数据等功能。
[Abstract]:With the urgent demand of modern military war for satellite navigation and positioning and the increasing dependence of national economy on navigation and positioning, satellite navigation and positioning has become an indispensable part of modern society. However, the key to direct acquisition of navigation P code is to determine the initial acquisition time. The more accurate the starting time is, the shorter the acquisition time is, and the easier the acquisition process is. Therefore, the research and implementation of a high precision timing chip is of great significance to improve the direct acquisition of navigation P codes. In this paper, the real-time clock circuit designed for navigation handheld terminal not only has the conventional timing function, but also supports I2C bus, has the ability of power management, and can realize the time correction function of external reference time signal. The chip design is mainly carried out from four aspects: circuit architecture, punctuality algorithm optimization, shell customization and batch measurement system. The chip structure is divided into modules and finally revolves around the compensation architecture of "temperature sensor ADC EEPROM DAC". At the same time, taking into account the requirements of low power consumption and high precision, through repeated optimization and improvement, the final high punctuality accuracy is gradually achieved. After practical test, all the performance indexes of real-time clock circuit meet the expected requirements. Among them, punctuality accuracy can reach the international leading level. Aiming at the production and debugging process of real-time clock circuit, a batch adjustment system is developed to realize the automatic debugging of the chip, the automatic acquisition of the compensation value of the sampling temperature point, the automatic storage of the production process data and the processing of the data.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5

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