Ground penetrating synthetic pulse radar: dynamic range and modes of operation

Hamran, Svein‐Erik; Gjessing, Dag T.; Hjelmstad, Jens; Aarholt, Eldar

doi:10.1016/0926-9851(95)90025-x

Cited by 83 publications

(24 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Positions for GPR traces recorded between GPS positions were found by linear interpolation between the recorded positions. Our GPR system is a continuous wave stepped frequency radar using synthetic aperture radar processing and is described in detail by Hamran and Aarholt [1993] and Hamran et al [1995]. The system is flexible and allows the user to determine the desired frequency and bandwidth for any specific task in the range of 0.03–6 GHz.…”

Section: Methodsmentioning

confidence: 99%

Spatial variability in water content at the cold‐temperate transition surface of the polythermal Storglaciären, Sweden

2004

View full text Add to dashboard Cite

[1] The volume fraction of liquid water in temperate glacier ice is important not only for the flow of glaciers and the analysis and processing of ground penetrating radar data from glaciers but also for the stability of the thermal layering in polythermal glaciers. However, little is known about the spatial variations of water content in glaciers. We use relative backscatter strength of ground-penetrating radar signals to estimate the spatial distribution of water content close to the cold-temperate transition on Storglaciären, northern Sweden, in an area close to the equilibrium line. The values of relative backscatter strength are calibrated using determinations of absolute water content from temperature measurements across the cold-temperate transition and the thermodynamic boundary condition at the freezing front. The results show a water content of 0.80%, 0.75%, and 0.58% at three calibration points and a mean water content of 0.8% with a standard deviation of ±0.26% for the extrapolated water content. The extrapolated water content shows a distinct pattern, with lower water content on one side of the glacier center line and higher water content on the other side, with higher water content on the northern side. We hypothesize that the different water contents result from the fact that the ice on either side of the center line originates from different cirques, thus implying spatial variations in the entrapment of water in the firn-ice transition process in the different cirques.

show abstract

Section: Methodsmentioning

confidence: 99%

Spatial variability in water content at the cold‐temperate transition surface of the polythermal Storglaciären, Sweden

2004

View full text Add to dashboard Cite

show abstract

“…It is a continuous-wave step-frequency radar using 201 frequencies evenly distributed over an adjustable bandwidth. The system has a high dynamic range, or sensitivity, and therefore a better potential for depth penetration than conventional impulse radars (Hamran et al, 1995). In the present study a pair of 155 MHz dipole antennae mounted on a Hägglund all-terrain carrier and a bandwidth of about 5 MHz were used.…”

Section: Radio Echo Sounding Methodsmentioning

confidence: 99%

Subglacial Preservation of Valley Morphology at Amundsenisen, Western Dronning Maud Land, Antarctica

Näslund

1997

Earth Surf. Process. Landforms

View full text Add to dashboard Cite

Figure 4 did not reproduce well in the final printing, for which the publishers apologise. Figure 4. The subglacial valley system at Amundsenisen which was mapped in more detail, shown with a 2× vertical exaggeration and contour interval of 25 m. The bed surface has been corrected for the ice surface topography. Data on bed and ice sheet topography were collected with a spacing of 500 m or less along the profiles, shown by the dotted lines on the upper ice surface. The general valley morphology indicates that the valley was formed by erosion by a wet-based local mountain glacier. This site is used for a comparative calculation of basal temperature for discussing where, on a local scale, preservation of landforms may occur

show abstract

“…Hamran and Aarholt, 1993;Hamran et al, 1995), which was operated with a bandwidth of 800 -2300 MHz. The surveys were made from a tracked vehicle.…”

Section: Gpr Soundings and Positioningmentioning

confidence: 99%

Spatial characteristics of snow accumulation in Dronning Maud Land, Antarctica

Richardson-Näslund

2004

Global and Planetary Change

View full text Add to dashboard Cite

Ground penetrating synthetic pulse radar: dynamic range and modes of operation

Cited by 83 publications

References 2 publications

Spatial variability in water content at the cold‐temperate transition surface of the polythermal Storglaciären, Sweden

Spatial variability in water content at the cold‐temperate transition surface of the polythermal Storglaciären, Sweden

Subglacial Preservation of Valley Morphology at Amundsenisen, Western Dronning Maud Land, Antarctica

Spatial characteristics of snow accumulation in Dronning Maud Land, Antarctica

Contact Info

Product

Resources

About