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L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.


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Journal ArticleDOI
TL;DR: In this article, the design and simulation of a pyramidal horn antenna operating at L-band frequencies (12 GHz) to detect a landmine was explored. But the work in this paper is limited to the simulation of the ground penetrating radar (GPR).
Abstract: Landmine detection is an important and yet challenging problem remains to be solved. Ground Penetrating Radar (GPR) is a powerful and rapidly maturing technology for subsurface threat identification. The detection methodology of GPR depends mainly on the contrast of the dielectric properties of the searched target and its surrounding soil. This contrast produces a partial reflection of the electromagnetic pulses that are being transmitted into the soil and then being collected by the GPR. One of the most critical hardware components for the performance of GPR is the antenna system. The current paper explores the design and simulation of a pyramidal horn antenna operating at L-band frequencies (12 GHz) to detect a landmine. A prototype model of the GPR system setup is developed to simulate full wave analysis of the electromagnetic fields in different soil types. The contrast in the dielectric permittivity of the landmine and the sandy soil is the most important parameter to be considered for detecting the presence of landmine. L-band horn antenna is proved to be well-versed in the investigation of landmine detection. Keywords—Full wave analysis, ground penetrating radar, horn antenna design, landmine detection.

1 citations

Proceedings ArticleDOI
28 Feb 1994

1 citations

Journal ArticleDOI
TL;DR: In reducing the data from a recent series of high altitude balloon to aircraft measurements at L band, some qualitative results were reported concerning the negative correlation between the vertical and horizontal polarizations.
Abstract: In reducing the data from a recent series of high altitude balloon to aircraft measurements at L band, some qualitative results were reported concerning the negative correlation between the vertical and horizontal polarizations. Some of these data are presented in strip chart form to display this effect. In addition, a plot of the sum of the squares of the two polarizations is also presented to indicate the level of the received power and the possible benefits of power combining. Finally, the joint envelope density is examined in the 1imit of deep fading and the power fades are compared with those for independent combining.

1 citations

01 Feb 1976
TL;DR: In this article, the feasibility of using adaptive multibeam multi-frequency antennas on the spacelab was studied, and the experiment configuration and program plan needed for a demonstration to prove the concept.
Abstract: The feasibility was studied of using adaptive multibeam multi-frequency antennas on the spacelab, and to define the experiment configuration and program plan needed for a demonstration to prove the concept. Three applications missions were selected, and requirements were defined for an L band communications experiment, an L band radiometer experiment, and a Ku band communications experiment. Reflector, passive lens, and phased array antenna systems were considered, and the Adaptive Multibeam Phased Array (AMPA) was chosen. Array configuration and beamforming network tradeoffs resulted in a single 3m x 3m L band array with 576 elements for high radiometer beam efficiency. Separate 0.4m x 0.4 m arrays are used to transmit and receive at Ku band with either 576 elements or thinned apertures. Each array has two independently steerable 5 deg beams, which are adaptively controlled.

1 citations

Journal Article
TL;DR: This paper presents a design of L band space-borne SAR digital receiver using direct RF sampling, and a block adaptive quantization(BAQ) module with flexible compression ratio is developed in order to reduce the volume of data stored onboard and later transmitted to ground station.
Abstract: This paper presents a design of L band space-borne SAR digital receiver using direct RF sampling.Appropriate RF sampling frequency is selected and digital quadrature demodulation structure is improved.In order to reduce the volume of data that is stored onboard and later transmitted to ground station,a block adaptive quantization(BAQ) module with flexible compression ratio is developed.Simple electrical system design and advanced SAR system are achieved by using direct RF sampling.Feasibility and performance are verified by experimental results.

1 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
202222
202134
202036
201944
201838