Modeling Tree Foliage for Microwave Radar Transparency Study.

2020 ◽  
Author(s):  
Monica Jaramillo ◽  
Armin Doerry ◽  
Christos Christodoulou
Keyword(s):  
Microwave Radar ◽  
Tree Foliage

scholarly journals Recent Development of Non-Contact Multi-Target Vital Sign Detection and Location Tracking Based on Metamaterial Leaky Wave Antennas

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3619
Author(s):  
Yichao Yuan ◽  
Chung-Tse Michael Wu
Keyword(s):  
Vital Sign ◽  
Complex Structure ◽  
Health Condition ◽  
Phase Shifters ◽  
Location Tracking ◽  
Radar Sensor ◽  
Leaky Wave ◽  
Multiple Targets ◽  
Microwave Radar ◽  
Sign Detection

Microwave radar sensors have been developed for non-contact monitoring of the health condition and location of targets, which will cause minimal discomfort and eliminate sanitation issues, especially in a pandemic situation. To this end, several radar sensor architectures and algorithms have been proposed to detect multiple targets at different locations. Traditionally, beamforming techniques incorporating phase shifters or mechanical rotors are utilized, which is relatively complex and costly. On the other hand, metamaterial (MTM) leaky wave antennas (LWAs) have a unique property of launching waves of different spectral components in different directions. This feature can be utilized to detect multiple targets at different locations to obtain their healthcare and location information accurately, without complex structure and high cost. To this end, this paper reviews the recent development of MTM LWA-based radar sensor architectures for vital sign detection and location tracking. The experimental results demonstrate the effectiveness of MTM vital sign radar compared with different radar sensor architectures.

New species of Drymopsalta Heath Cicadas (Cicadidae: Cicadettinae: Cicadettini) from Queensland and Northern Territory, Australia, with overview of genus

Zootaxa ◽  
2013 ◽  
Vol 3620 (1) ◽  
pp. 1-42
Author(s):  
A. EWART ◽  
L. W. POPPLE
Keyword(s):  
New Species ◽  
High Frequency ◽  
Similar Pattern ◽  
National Park ◽  
Northern Territory ◽  
Allopatric Species ◽  
Temporal Structures ◽  
Cape York ◽  
Three New Species ◽  
Tree Foliage

Three new species are described in the genus Drymopsalta Ewart, previously known only from D. crepitum Ewart and D. daemeli Distant. The three new species occur in Southern Queensland and Northern Territory. D. wallumi sp. nov. occurs along coastal S.E. Queensland, whereas D. hobsoni sp. nov. is restricted to the Bringalily State Forest, near Inglewood, southern inland Queensland. D. acrotela sp. nov. is found in the Litchfield National Park and other locations near Jabaluka, Cahills Crossing, E. Alligator River and Nourlangie, all across the northern Northern Territory. D. crepitum occurs on the Cape York Peninsular extending into the southern Gulf, while D. daemeli occurs in two localised regions in central coastal N.S.W. Each of the species inhabits heath vegetation, often spilling-over into adjacent tree foliage. The species of Drymopsalta are small and inconspicuous cicadas (<15 mm body length) with relatively high frequency songs (~15 to 22 kHz). The temporal structures of the normal calling songs follow a similar pattern in each species, consisting of the emission of short chirps (comprising 2–16 ticks). Between the chirps are emitted one (D. wallumi, D. hobsoni, D. acrotela), two (D. daemeli) or 1–9 (D. crepitum) intervening single ticks. The species can be distinguished by the timing and the number of these single ticks relative to the adjacent chirps with the notable exception of D. hobsoni and D. acrotela. The calling songs of these two allopatric species are indistinguishable, an unusual feature in Australian cicadas. Two additional song variants are described, a more unstructured chirping song without intervening single ticks observed in each of the species except D. crepitum, and periodic extended buzzing echemes emitted within the calling songs (excepting the D. wallumi song).

Stable-Carbon Isotope Variability in Tree Foliage and Wood

Ecology ◽  
1986 ◽  
Vol 67 (4) ◽  
pp. 1002-1010 ◽  
Author(s):  
Steven W. Leavitt ◽  
Austin Long
Keyword(s):  
Carbon Isotope ◽  
Stable Carbon Isotope ◽  
Stable Carbon ◽  
Tree Foliage

scholarly journals Validation of a microwave radar system for the monitoring of locomotor activity in mice

2006 ◽  
Vol 4 (0) ◽  
pp. 7 ◽  
Author(s):  
Vittorio Pasquali ◽  
Eugenio Scannapieco ◽  
Paolo Renzi
Keyword(s):  
Locomotor Activity ◽  
Radar System ◽  
Microwave Radar

Peak Wave Direction Measurement Using Shipboard Coherent Microwave Radar

2021 ◽  
pp. 1-5
Author(s):  
Zezong Chen ◽  
Chunyang Zhang ◽  
Chen Zhao ◽  
Xi Chen ◽  
Han Liu
Keyword(s):  
Wave Direction ◽  
Microwave Radar

Measurement and modeling of millimeter-wave scattering from tree foliage

Radio Science ◽  
1990 ◽  
Vol 25 (3) ◽  
pp. 193-203 ◽  
Author(s):  
F. T. Ulaby ◽  
T. H. Haddock ◽  
Y. Kuga
Keyword(s):  
Millimeter Wave ◽  
Wave Scattering ◽  
Millimeter Wave Scattering ◽  
Tree Foliage
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