【摘 要】
：
The dissertation introduced factor that high dynamic condition influence the velocity measurement precision of GPS receiver’s carrier tracking loop.Based on analyses on the measurement error and track
【机 构】
：
Mailbox 5131,Beijing,China;GNSS TT&C lab,Beijing Institutes of Tracking and Telecommunications Techn
论文部分内容阅读
The dissertation introduced factor that high dynamic condition influence the velocity measurement precision of GPS receiver’s carrier tracking loop.Based on analyses on the measurement error and trackingthreshold, the adaptability and tracking precision of carrier tracking loop in high dynamic condition were simulated, the measurement error and the finally velocity precision were expressed in different high dynamic condition.The paper has important theoretical significance for comprehending the velocity measurement precision in high dynamic condition and designing tracking loop that is adapted to high dynamic condition.
其他文献
为探讨微波预处理对莲子淀粉的改性作用,本文利用微波工作站对莲子淀粉进行加热预处理,观察预处理后的淀粉颗粒形态变化,后期糊化过程中直链淀粉溶出量和流变特性,结果表明,30％的莲子淀粉乳经不同微波功率预处理后,其颗粒形态未发生明显变化,仍呈现光滑的椭球状.随着微波功率的增强,颗粒间出现了明显的聚集粘结行为,颗粒的平均粒径最大值可达26.37 μm,为原淀粉2.15倍,同时淀粉颗粒晶区比例增大,995/
通过比较红曲霉菌株在九种不同发酵基质的色素产量,筛选最适合的发酵基质；在此基础上外加碳氮源,比较不同种类的碳氮源对红曲霉产色素能力的影响.研究结果表明：红曲霉菌株在以红米为基质的固态发酵体系中的色素产量最高,其醇溶性总色价为287.25U·g-1,水溶性总色价为95.55U ·g-1；以红米为发酵基质,通过添加不同种类的碳源和氮源进行发酵,发现以果糖为外加碳源时红曲霉菌株的醇溶性色素产量可提高到8
目前环糊精对于味觉物质的影响主要集中于环糊精与味物质的相互作用。本文研究了阿斯巴甜并比较常用的五种环糊精β-环糊精(β-CD),y-环糊精(γ-CD),α-环糊精(α-CD),羟丙基-β-环糊精(HP-β-CD)和甲基-β-环糊精(M-β-CD)的包结。考察了这5种环糊精对甜味剂阿斯巴甜(APM)感官甜度稳定性的影响。感官实验结果表明,β-环糊精可以使阿斯巴甜甜感最稳定,荧光光谱结果显示阿斯巴甜和
本文从菌草灵芝子实体中提取纯化灵芝多糖，结合高分子物理和生物试验的方法研究菌草灵芝多糖的化学结构及其与茶多酚复合的抗氧化活性。结果表明：GLPS-1、GLPS-2和GLPS-3三种菌草灵芝多糖组分具有典型的糖类物质的特征吸收峰，糖残基为吡喃环型，糖苷键的连接方式为β型。菌草灵芝粗多糖的抗氧化能力明显强于纯化多糖；粗多糖与茶多酚在抗氧化能力上表现出显著的协同作用，其中对羟基自由基的清除作用的协同效果
本实验探讨了pH、热、光、金属离子(Na+、Ca2+、Fe3+、Mg2+、Cu2、Zn2+)、H202、Na2SO3、蔗糖、苯甲酸钠、D-异抗坏血酸钠以及不同包装材质对两种蓝莓中花色苷理化稳定性的影响.结果表明：蓝莓花色苷只有在酸性条件下稳定存在；320min后,同温度下①号吸光值变化率高于②号约8.7％；自然光处放6d后,②号蓝莓降解率比①号蓝莓高约12.1％；经6种金属离子处理后,②号吸光值变
This paper analyzes some GLONASS abnormal data of receiver software processing,and locates the source of the problem in navigation data handling error under high bit-error rates.Through the derivation
The Doppler frequency and pseudorange model are important information for open-loop tracking of GPS/LEO signal.The Doppler frequency model can be predicted through iteration,with the use of a bending
The precision of broadcast ephemeris of navigation satellite is one of the important factors,which determines the performance indicator of navigation satellite system.However,the result of precise orb
BeiDou Navigation Satellite System (BDS) offers service to space-based users.The future Chinese Manned Space Station (CSS) orbits inside the service area of the future global BDS,and can utilize BDS t
Navigation based on stellar refraction refers to a method that uses large visual field star sensor to detect several stars refracted and not refracted by earth atmosphere,and then finishes autonomous