The first part is the analysis of why the low altitude is limited in frequency modification continuous wave Doppler navigation radar.
第一部分分析了调频连续波多普勒导航雷达存在低高度限制的原因。
The state equation and error analysis of SINS combined with globe positioning system (GPS) and Doppler navigation system (DNS) were also presented.
给出了SINS与全球卫星定位系统(GPS)、多普勒导航系统(DNS)组合导航系统的状态方程和误差分析，在给定条件下进行了仿真试验。
A simple inertial or Doppler navigation has a common defect that position errors are always increasing with flight time or distance, therefore an external reference system is necessary.
纯惯性导航或多普勒导航的一个共同缺点是：一般都具有随时问或距离增长的位置误差，这就需要有一个外基准系统。
In the satellite navigation and positioning system, Doppler shift is one of the key problems that may degrade the performance of the satellite receiver.
在卫星导航定位系统中，多普勒频率偏移是影响接收机性能的关键因素之一。
DVOR (Doppler VHF omni-directional Range) is one of the equipments most commonly used in today's civil aviation communications and navigation. It provides the perspective information for the aircraft.
（多普勒甚高频全向信标）是当今民航最为常用的通信导航设备之一，可以给民航飞行器提供角度信息。
According to the feature that the AGPS(Assisted GPS) receiver can obtain navigation data from assisted network, a new algorithm for assisted Doppler is proposed.
根据辅助型接收机能从 辅助网络获取导航电文的特点，提出了一种精简星历和卫星时钟参数辅助算法。
There is great Doppler frequency shift under high dynamic circumstances, thus the common GPS receiver cannot work reliably without the help of inertial navigation devices.
高动态环境存在较大的多普勒频移，这使得普通的GPS接收机在没有惯导辅助的情况下很难可靠工作。
It is an effective way in integrated navigation by using Strapdown Inertial navigation System (SINS), GPS and Doppler Velocity Log (DVL).
利用捷联惯导(SINS)、GPS定位系统和多普勒计程仪(DVL)进行组合导航是水下运载器导航定位的有效方式。
Under the condition that marked inertial navigation units(INU) measurement errors do exist, two new Doppler centroid estimation techniques in frequency domain and time domain were proposed.
本文针对载机惯导参数误差较大的实际情况，提出了改进的频域和时域多普勒质心估计算法。
Under the condition that marked inertial navigation units(INU) measurement errors do exist, two new Doppler centroid estimation techniques in frequency domain and time domain were proposed.
本文针对载机惯导参数误差较大的实际情况，提出了改进的频域和时域多普勒质心估计算法。
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