相关实验视频
Updated: Jul 2, 2025
16:11
Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
9.4K
低成本SDR对多普勒基定位准确性的频率不稳定性影响
Kacper Bednarz1, Jarosław Wojtuń1, Jan M Kelner1
1Institute of Communications Systems, Faculty of Electronics, Military University of Technology, 00-908 Warsaw, Poland.
Sensors (Basel, Switzerland)
|February 24, 2024
概括
在软件定义无线电 (SDR) 中,高频稳定性对于准确的信号多普勒频率 (SDF) 定位至关重要. 使用外部频率标准可以显著减少基于SDR的传感器的位置错误.
科学领域:
- 电气工程 电气工程
- 信号处理 信号处理
- 无线电频率工程 无线电频率工程
背景情况:
- 软件定义无线电 (SDR) 平台越来越多地用于射频 (RF) 传感应用.
- 使用信号多普勒频率 (SDF) 方法准确定位取决于SDR的频率稳定性.
- 现有的SDR平台可能表现出频率不稳定性,影响基于SDF的定位精度.
研究的目的:
- 评估广泛使用的SDR平台是否适合SDF本地化.
- 研究SDR频率稳定性对定位准确性的影响.
- 确定最佳的SDR平台和频率标准,以加强SDF本地化.
主要方法:
- 对于选定的SDR平台的频率稳定性的表征,无论是否带有外部鲁比时钟.
- 根据测量的频率稳定性,将SDR设备分为三个级别.
- 通过模拟对每个设备类别在短程和远程场景下的定位精度的估计.
主要成果:
- 通过整合外部频率标准,定位误差从20公里减少到30米 (远程) 和15公里减少到2米 (短程).
- 该研究确定了SDR频率稳定性和SDF定位精度之间的直接相关性.
- 外部频率标准对于减轻基于多普勒效应的定位传感器中的SDR频率不稳定性至关重要.
结论:
- 对于SDF定位传感器,建议使用bladeRF 2.0微型xA4或USRP B200mini-i SDR平台,加上芯片级原子钟 (CSAC SA.45s),用于SDF定位传感器.
- 这些配置使无线电发射器能够在最小的误差下精确定位.
- 未来的研究应该专注于开发紧,低功耗和稳定的SDF位置传感器系统.
相关概念视频
01:26Errors in Global Positioning System
45
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
45
01:05Doppler Effect - II
3.4K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
3.4K
00:56Doppler Effect - I
3.6K
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
3.6K
01:28Field Application of Global Positioning System
45
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
45
01:30Electronic Distance Measuring Instruments
37
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
37
01:30Types of Global Positioning System Surveys
58
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
58