Techniques for Schumann Resonance Measurements: A Comparison of Four Amplifiers With a Noise Floor Estimate

2015 ◽  
Vol 64 (10) ◽  
pp. 2759-2768 ◽  
Author(s):  
Jose A. Gazquez Parra ◽  
Manuel Fernandez Ros ◽  
Nuria Novas Castellano ◽  
Rosa M. Garcia Salvador
Keyword(s):  
Schumann Resonance ◽  
Noise Floor

3D localization for subcentimeter-sized devices

2021 ◽  
Vol 64 (3) ◽  
pp. 117-125
Author(s):  
Rajalakshmi Nandakumar ◽  
Vikram Iyer ◽  
Shyamnath Gollakota
Keyword(s):  
Metropolitan Area ◽  
Ultra Wideband ◽  
Phase Information ◽  
Noise Floor ◽  
Localization System ◽  
Coin Cell ◽  
3D Localization ◽  
Button Cell ◽  
Iot Devices ◽  
5 Ghz

The vision of tracking small IoT devices runs into the reality of localization technologies---today it is difficult to continuously track objects through walls in homes and warehouses on a coin cell battery. Although Wi-Fi and ultra-wideband radios can provide tracking through walls, they do not last more than a month on small coin and button cell batteries because they consume tens of milliwatts of power. We present the first localization system that consumes microwatts of power at a mobile device and can be localized across multiple rooms in settings such as homes and hospitals. To this end, we introduce a multiband backscatter prototype that operates across 900 MHz, 2.4 GHz, and 5 GHz and can extract the backscatter phase information from signals that are below the noise floor. We build subcentimeter-sized prototypes that consume 93 μW and could last five to ten years on button cell batteries. We achieved ranges of up to 60 m away from the AP and accuracies of 2, 12, 50, and 145 cm at 1, 5, 30, and 60 m, respectively. To demonstrate the potential of our design, we deploy it in two real-world scenarios: five homes in a metropolitan area and the surgery wing of a hospital in patient pre-op and post-op rooms as well as storage facilities.

CORRELATION OF LOCAL LIGHTNING ACTIVITY WITH EXTRA LOW FREQUENCY DETECTOR FOR SCHUMANN RESONANCE MEASUREMENTS

2021 ◽  
pp. 147671
Author(s):  
G. Tatsis ◽  
A. Sakkas ◽  
V. Christofilakis ◽  
G. Baldoumas ◽  
S.K. Chronopoulos ◽  
...  
Keyword(s):  
Low Frequency ◽  
Lightning Activity ◽  
Schumann Resonance ◽  
Frequency Detector

Enhanced Sensitivity and Reduced Noise Floor in Magnetoelectric Laminate Sensors by an Improved Lamination Process

2011 ◽  
Vol 94 (11) ◽  
pp. 3738-3741 ◽  
Author(s):  
Menghui Li ◽  
David Berry ◽  
Jaydip Das ◽  
David Gray ◽  
Jiefang Li ◽  
...  
Keyword(s):  
Noise Floor ◽  
Enhanced Sensitivity ◽  
Lamination Process
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