High Sensitivity Very Low Frequency Receiver for Earthquake Data Acquisition

Low Rate High Frequency Data Transmission from Very Remote Sensors

High‐latitude geomagnetically induced current events observed on very low frequency radio wave receiver systems

[1] Noise burst events observed at Sodankylä, Finland, in the frequency range 20–25 kHz during January–April 2005 last up to 4 s, occur more often at midnight, are associated with high geomagnetic activity, and exhibit a quasi‐constant amplitude perturbation ∼15 dB above the background noise levels. We considered the possibility that the events could be caused by lightning noise breakthrough. T...

Automatic Parameter Determination for Real-Time Acquisition using Frequency Domain Methods in a High Sensitivity Software Receiver

Martin S. H. Ma is a Master of Science candidate in the Position, Location and Navigation (PLAN) group at the Department of Geomatics Engineering in the University of Calgary. He received his bachelor’s degree in Computer Engineering from the University of British Columbia in 2001 and had since been a DSP engineer at companies like Philips Semiconductors and SiRF Technology. His current researc...

Benefits of Very High Frequency Total Lightning Mapping over Very Low or Low Frequency Cloud Lightning Detection for Meteorological Applications

As a thunderstorm approaches a fixed asset (90% of the time) where people are located, VHF cloud lightning mapping provides 10s of minutes of lead time before the first cloud-to-ground strokes reach this asset. At times when a thunderstorm develops directly over the fixed asset (~10% of the time), the cloud flash detection efficiency exceeding 90% maximizes lead time during thunderstorm growth ...

Performance Evaluation of Acquisition Scheme Based on Timing-synchronized Network for AGPS High-sensitivity Receiver

A function of automatic location identification from an emergency call is required in Japan and many other countries. How to give a reliable position promptly is a problem in places where the GPS signal is extremely weak. We propose an acquisition scheme for the Assisted GPS (AGPS) architecture based on a timing-synchronized mobile network. With this method, the C/A code search and frequency se...