搜索结果: 1-15 共查到“航空、航天科学技术 Ionospheric”相关记录25条 . 查询时间(0.087 秒)
Ionospheric turbulence from ground-based and satellite VLF/LF transmitter signal observations for the Simushir earthquake (November 15, 2006)
VLF/LF signal propagation Eartquake precursors
font style='font-size:12px;'>
2015/8/24
Signals from very low frequency (VLF)/ low frequency (LF) transmitters recorded on the ground station at Petropavlovsk-Kamchatsky and on board the French DEMETER satellite were analyzed for the Simush...
Ionospheric Correction Using Tomography
Ionospheric Correction Tomography
font style='font-size:12px;'>
2015/6/29
The most demanding application of wide area di erential corrections to GPS is vertical positioning of aircraft on precision approach. Here the Wide Area Augmentation System (WAAS) combines accuracy re...
Ionospheric Estimation and Integrity Threat Detection
Ionospheric Estimation Integrity Threat Detection
font style='font-size:12px;'>
2015/6/29
A full realization of the Wide Area Augmentation System (WAAS) is intended to provide aircraft guidance throughout the en route, terminal, non-precision and precision approach phases of ight.
Analytical and Experimental Observations of Ionospheric and Tropospheric Decorrelation Effects for Differential Satellite Navigation during Precision Approach
Ionospheric Tropospheric Decorrelation Effects Differential Satellite Navigation Precision
font style='font-size:12px;'>
2015/6/29
The introduction of the Global Positioning System(GPS) ushered in a new era of affordable precise navigation.Differential GPS (DGPS) corrections have reduced positioning errors from about 100 meters t...
The Effects of Local Ionospheric Decorrelation on LAAS:Theory and Experimental Results
Local Ionospheric Decorrelation LAAS Theory Experimental Results
font style='font-size:12px;'>
2015/6/29
Solar cycle 23 is expected to reach a maximum in the year 2000. This has produced a recent flurry of research about the possible adverse effects of the ionosphere on the millions of GPS users. The int...
Robust Detection of Ionospheric Irregularities
Robust Detection Ionospheric Irregularities
font style='font-size:12px;'>
2015/6/29
The Wide Area Augmentation System (WAAS) will provide real-time differential GPS corrections and integrity information for aircraft navigation use. The most stringent application of this system will b...
Ionospheric Threat Model Methodology for WAAS
Ionospheric Threat Model Methodology WAAS
font style='font-size:12px;'>
2015/6/26
The ionosphere is the largest remaining error source affecting GPS. It also has some of the least predictable spatial and temporal variations. As such the ionosphere becomes the determining factor in ...
Assessment of Ionospheric Impact on LAAS Using WAAS Supertruth Data
Ionospheric Impact LAAS WAAS Supertruth Data
font style='font-size:12px;'>
2015/6/26
In order to reflect the impact of spatial ionospheric gradients on Local Area Augmentation System (LAAS) users, the LAAS Ground Facility (LGF) broadcasts a conservative standard deviation (σvert_iono_...
Using WAAS Ionospheric Data to Estimate LAAS Short Baseline Gradients
WAAS Ionospheric Data Estimate LAAS Short Baseline Gradients
font style='font-size:12px;'>
2015/6/26
The Local Area Augmentation System (LAAS) is intended to provide real-time differential GPS corrections with the high accuracy, availability, and integrity required for Category II/III landings. In or...
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning
Ionospheric Scintillation Effects Dual Frequency GPS Positioning
font style='font-size:12px;'>
2015/6/26
The low latitude ionosphere poses a challenge to both GPS users and Satellite-Based Augmentation System(SBAS) providers. Single and dual frequency GPS receivers used in low-latitude regions can suffer...
Protecting Against Unsampled Ionospheric Threats
Against Unsampled Ionospheric Threats
font style='font-size:12px;'>
2015/6/26
Nominally, the mid-latitude ionosphere sampled by WAAS is smooth and slowly varying. However,during ionospheric storms, small-scale irregularities may form. These irregularities cause rapid changes in...
Model Analysis on the Performance of an Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop in the Presence of Ionospheric Scintillations
Model Analysis Performance Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop Presence Ionospheric Scintillations
font style='font-size:12px;'>
2015/6/25
Ionospheric scintillation has a significant impact on the availability of Global Positioning System (GPS) and Wide Area Augmentation System (WAAS), especially when the GPS/WAAS receiver is dynamically...
Performance of a Doppler-Aided GPS Navigation System for Aviation Applications under Ionospheric Scintillation
Performance Doppler-Aided GPS Navigation System Aviation Applications Ionospheric Scintillation
font style='font-size:12px;'>
2015/6/25
Aircraft landing using the Global Positioning System (GPS) in equatorial regions is more difficult than in other regions because ionospheric scintillation is prevalent.Ionospheric scintillation causes...
Availability Benefit;Future Dual Frequency GPS Avionics;Ionospheric Scintillation
Availability Benefit Future Dual Frequency GPS Avionics Ionospheric Scintillation
font style='font-size:12px;'>
2015/6/25
With the launch of the GPS-IIF satellites, the new civil navigation signals at L5 (1176.45 MHz) will become available to the GNSS community.One of the most significant benefits introduced by this new ...
Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation
Availability Benefit Future Dual Frequency GPS Avionics Ionospheric Scintillation
font style='font-size:12px;'>
2015/6/25
A Global Positioning System (GPS) receiver may lose carrier tracking lock to the GPS signal under deep and frequent fades due to ionospheric scintillation. The frequent loss of lock observed during a ...