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TROPICAL FOREST BIOMASS MAPPING FROM DUAL FREQUENCY SAR INTERFEROMETRY (X AND P- BANDS)
Interferometer SAR Forestry Land cover Inventory Mapping Modelling
2015/7/30
Radar sensors operating with different wavelengths and polarizations have been widely used for large-scale forest mapping and
monitoring. The interferometric phase obtained by microwave sensors conta...
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning
Ionospheric Scintillation Effects Dual Frequency GPS Positioning
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...
Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS
Ionosphere Monitoring Methodology Hybrid Dual-Frequency LAAS
2015/6/26
Strong ionosphere storms are a potential threat for the Local Area Augmentation System (LAAS). During these storms,very large spatial gradients of ionosphere delays might cause significant errors in u...
Evaluation of Two Types of Dual-Frequency Differential GPS Techniques under Anomalous Ionosphere Conditions
Dual-Frequency Differential GPS Techniques Ionosphere Conditions
2015/6/26
Strong ionosphere storms are a potential threat for the Local Area Augmentation System (LAAS). During these storms,large spatial and temporal gradients of the ionosphere component on the GPS signals c...
Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User
Bounding Higher Order Ionosphere Errors Dual Frequency GPS User
2015/6/25
The advent of a second civil GPS frequency heralds a new phase of GPS performance. For single-frequency GPS users, the signal delay due to refraction through the ionosphere is the largest and most var...
Dual-Frequency Smoothing for CAT III LAAS:Performance Assessment Considering Ionosphere Anomalies
Dual-Frequency Smoothing CAT III LAAS Considering Ionosphere
2015/6/25
Strong ionosphere storms are the most-threatening potential fault mode for the Local Area Augmentation System (LAAS). Multi-frequency GPS techniques are known to be an effective means of reducing or r...
Validation of Multiple Hypothesis RAIM Algorithm Using Dual-frequency GNSS Signals
RAIM Algorithm Dual-frequency GNSS Signals
2015/6/25
A Multiple Hypothesis Solution Separation (MHSS) RAIM algorithm was developed at Stanford in recent years, with the purpose of meeting the stringent integrity requirements imposed by the Federal Aviat...
A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM
Simple Algorithm Dual Frequency Ground Monitoring Compatible ARAIM
2015/6/25
Dual frequency Absolute RAIM has the potential of providing global coverage of vertical guidance. However,a constellation of thirty or more satellites will be necessary to achieve this goal. In this w...
Availability Benefit;Future Dual Frequency GPS Avionics;Ionospheric Scintillation
Availability Benefit Future Dual Frequency GPS Avionics Ionospheric Scintillation
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
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 ...
Vertical Protection Level Equations for Dual Frequency SBAS
Vertical Protection Level Equations Dual Frequency SBAS
2015/6/25
The L1-only Satellite-Based Augmentation System (SBAS) Minimum Operational Performance Standards (MOPS) were developed long before any SBASs were certified for operation.
In the next few years GPS will start broadcasting civil signals suitable for aviation use on both the L1 and L5 frequencies. In addition, Galileo and other constellations will offer an even greater nu...
Evaluation of Dual-Frequency GBAS Performance using Data from Public Receiver Networks
Dual-Frequency GBAS Performance Public Receiver Networks
2015/6/25
Kazushi Suzuki is an Assistant Manager in the Air Traffic Management and Navigation Systems Department of NEC Corporation in Fuchu, Tokyo, Japan. He received his B.S. and M.S. degrees in Electrical En...
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver
2015/6/24
This paper demonstrates a real-time software receiver supporting GPS/WAAS dual-frequency (L1/L5) processing. The software receiver is implemented on a widely-available recent generation multi-core pro...
A Clock and Ephemeris Algorithm for Dual Frequency SBAS
Clock Ephemeris Algorithm Dual Frequency SBAS
2015/6/24
In the next years, the new GPS and Galileo signals (L1,L5) will allow civil users to remove the ionospheric delay in the pseudoranges. This will have a large impact on the Satellite Based Augmentation...