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Testing and Research on Interference to GPS from UWB Transmitters
Testing Research Interference GPS UWB Transmitters
2015/6/29
Ultra-Wideband (UWB) signal transmission is a potentially promising technology that is defined by a large fractional bandwidth. Most UWB systems are based on very short pulses of radio frequency energ...
一种消除BSS不确定性的新方法
盲源分离 最优分离矩阵循环迭代 信号帧 帧交叠
2016/4/6
本文提出了一种新型的消除BSS不确定性的方法。该方法在取信号帧的时候,相邻的信号帧有一定时间长度的交叠,利用交叠部分的相似性,进行信号重组,已达到消除不确定性的目的。
A Simple Method of Signal Quality Monitoring for WAAS LNAV/VNAV
Signal Quality Monitoring WAAS LNAV/VNAV
2015/6/26
The integrity of the Wide Area Augmentation System (WAAS), being developed for the FAA, is of significant concern because of its intended use in commercial aviation navigation applications.
Estimation of ICAO Threat Model Parameters For Operational GPS Satellites
Estimation ICAO Threat Model Parameters GPS Satellites
2015/6/26
The ICAO Second Order Step threat model defines a class of signal deformations that present a potential integrity threat to GPS-based aircraft landing systems such as the Local Area Augmentation...
Radio Frequency Interference Validation Testing for LAAS using the Stanford Integrity Monitor Testbed
Radio Frequency LAAS tanford Integrity Monitor Testbed
2015/6/26
Since GPS signals have very low received power levels (−130 dBm, or −160 dBW), their vulnerability to RF Interference (RFI) is a serious concern. This is particularly true for GPS-based sa...
As the Loran groundwave propagates, the signal is delayed. Additional Secondary Factor (ASF) is the value of the delay of the signal over the actual terrain relative to an all seawater path. The envel...
Lightning and other atmospheric noise interferes with Loran signal reception. This paper develops techniques to improve signal availability under these conditions.
With the successful implementation of the Wide Area Augmentation System (WAAS) for the North America, there is interest in implementing similar systems in other parts of the world. The ionosphere over...
Nominal Signal Deformations:Limits on GPS Range Accuracy
Nominal Signal Deformations GPS Range Accuracy
2015/6/26
Satellite-based navigation requires precise knowledge of the structure of the transmitted signals. For GPS, accurate knowledge of the shape of the ranging codes is required to ensure no biases are int...
Ionosphere Threat to LAAS: Updated Model,User Impact,and Mitigations
Ionosphere Threat LAAS Updated Model
2015/6/26
Several severe ionosphere storms have occurred in recent years that tripped the WAAS storm detector and caused partial WAAS service shutdowns. Under extreme conditions, these spatial gradients can thr...
GPS Receiver Architecture Effects on Controlled Reception Pattern Antennas for JPALS
GPS Receiver Architecture Effects Controlled Reception Pattern Antennas JPALS
2015/6/26
Stanford University is developing a controlled reception pattern antenna (CRPA) array with beam research testbed to evaluate CRPA algorithms and software tools, and their effects on GPS signals and sa...
Ionospheric Threats to Space-Based Augmentation System Development
Ionospheric Threats Space-Based Augmentation System Development
2015/6/26
The ionosphere contributes the largest and most unpredictable error to single frequency GPS users’ range measurements. The goal of a Space-Based Augmentation System (SBAS) in mitigating these ionosphe...
A skywave signal is one has propagated by reflecting off the ionosphere. These signals are common in low frequency (LF) broadcast. However, in Loran, these signals are nuisances since they interfere w...
Analysis of Carrier Phase and Group Delay Biases Introduced by CRPA Hardware
Carrier Phase Group Delay Biases Introduced CRPA Hardware
2015/6/26
The benefits afforded by Controlled Reception Pattern Antennas (CRPAs) in multipath and interference mitigation are well documented, and they find use in many applications today. As such, CRPAs are be...
Linear Time-of-Arrival Estimation in a Multipath Environment by Inverse Correlation Method
Linear Time-of-Arrival Estimation Multipath Environment Inverse Correlation Method
2015/6/26
The Maximum Likelihood Estimator (MLE) is most often used to estimate the signal time delay in a multipath en vironment. There are various implementations of the MLE which can be divided into the time...