Comparison of measured dominant scatterer identification of aircraft with multiple x-band radar systems

2001 ◽  
Author(s):  
Bill Ballard ◽  
Carl Darron ◽  
Lamar Gostin ◽  
Brian Hudson ◽  
Jeff Kemp ◽  
...  
Keyword(s):  
Radar Systems ◽  
X Band

Research on X-Band Weather Radar Network Based on Sensor Grid

2012 ◽  
Vol 468-471 ◽  
pp. 1274-1277
Author(s):  
Chen Li
Keyword(s):  
Weather Radar ◽  
Key Technology ◽  
Radar Systems ◽  
Radar Network ◽  
Additional Equipment ◽  
X Band ◽  
Architectural Framework ◽  
Information Advantage ◽  
New Generation ◽  
Network Advantage

Monitoring of precipitation using X-band weather radar systems is becoming popular. X-band weather radar network, as an additional equipment of China new generation weather radar, primarily used to measure weather echo within 3km above the ground and has a high prospect. The network, based on sensor grid, is greater information advantage and network advantage. This paper describes the design, the key technology and implementation of an architectural framework of the weather radar network based on sensor grid. The results show that the network works robustly in real time.

Class-AB and class-J 22 dBm SiGe HBT PAs for X-band radar systems

2017 ◽  
Author(s):  
P. Scaramuzza ◽  
C. Rubino ◽  
M. Tiebout ◽  
M. Caruso ◽  
M. Ortner ◽  
...  
Keyword(s):  
Class Ab ◽  
Sige Hbt ◽  
Radar Systems ◽  
X Band

scholarly journals MODERN SPACE RADAR SYSTEMS OF EARTH MONITORING

2021 ◽  
Vol 2 (6) ◽  
pp. 74-80
Author(s):  
E.N. Nafiev ◽  
A.V. Grechishchev ◽  
A.A. Kucheiko
Keyword(s):  
Second Generation ◽  
Small Spacecraft ◽  
Detailed Observation ◽  
Radar Systems ◽  
X Band ◽  
German Aerospace ◽  
First And Second Generation ◽  
Orbital Constellation ◽  
Canadian Company ◽  
Japanese Group

This article explores brief overview of modern radar systems for imaging and monitoring the Earth from space. The operating radar systems are divided into four classes: large spacecraft with global monitoring SAR, medium-sized spacecraft with detailed observation SAR, small spacecraft with detailed observation SAR, and commercial mini-spacecraft with detailed observation SAR. Listed are the main representatives of each class. Such large satellites as: European – Sentinel-1 (A, B); Japanese – ALOS-2; Canadian company MDA – Radarsat-2; Argentine – SAOCOM-1A / 1B; Chinese – Gaofen-3. Representatives of the class of mid-size spacecraft with SAR: German Aerospace Center (DLR) and the leading European space company Airbus DS – TerraSAR-X, TanDEM-X; Spanish PAZ; the Italian constellation of Cosmo-SkyMed satellites of the first and second generation; Japanese group IGS-Radar; Korean – KOMPSAT-5; Russian satellites “Kondor”. The small class includes Israeli mission satellites – TecSAR, RISAT-2 (India), Ofeq-10; Japanese – ASNARO-2, German satellites SAR-Lupe, English – NovaSAR-1. The last class of mini-spacecraft includes American - Capella and Finnish – ICEYE. The article also presents spacecraft for radar imaging, planned for launch, namely: the second generation of Italian satellites COSMO-SkyMed – CSG-2; 8 ICEYE spacecrafts (Finland); an increase in the Capella constellation, X-band radar satellites of the SuperView constellation and radar satellites Zhuhai (China); ALOS-4 JAXA (Japan); KOMPSAT-6 (Korea), radar satellites of the IRS constellation (India), American satellites XpressSAR, PredaSAR, EOS SAR, satellites of the Russian design Obzor-R1 and KondorFKA, as well as the space complex planned by ROSKOSMOS, including an orbital constellation of 6 small spacecraft for radar surveillance.

scholarly journals Preliminary reflectivity analysis of severe convective events in in the proximity of Goczałkowice-Zdrój, Poland

2019 ◽  
Vol 7 (2) ◽  
pp. 32-38
Author(s):  
Wojciech Pilorz ◽  
Philip Ciaramella
Keyword(s):  
Water Management ◽  
Lower Troposphere ◽  
Radar Data ◽  
Radar System ◽  
Severe Weather ◽  
Storm Events ◽  
Radar Systems ◽  
X Band ◽  
Scanning Area ◽  
Local Weather

Abstract At the beginning of 2018, the X-band radar in Goczałkowice-Zdrój (southern Poland) was launched. The scanning area corresponds with the scanning area of the POLRAD C-band radar system operated by the Polish Institute of Meteorology and Water Management. New opportunities were created for imaging phenomena by comparing some reflectivity features from C-Band radar and X-Band local weather radar. Moreover, some of the signatures located in the lower troposphere can be better documented by local X-Band radar. Firstly, reports from the ESWD (European Severe Weather Database) have been thoroughly analysed. All severe weather reports in the proximity of Goczałkowice-Zdrój (100-km radius) were gathered into one-storm events. Then the reflectivity from both radars was analysed to determine which reflectivity patterns occurred and when. X-band radars are known from the more intensive attenuation of the radar beam by the scatterers located closer to the radar, thus it is essential to compare capabilities of these two different radar systems. It was found that the average reflectivity for all convective incidents is higher when using POLRAD C-band radar data. In some events it was possible to find some spatial reflectivity signatures. We also discuss other reflectivity signatures previously described in the literature. Taking into account stronger Goczałkowice-Zdrój X-band radar attenuation, we suggest that some of these should be reviewed by reduction of the reflectivity thresholds.

scholarly journals Observational Consistency Comparison and Analyses of an X-Band Solid-State Radar and an X-Band Klystron Doppler Radar

2017 ◽  
Vol 34 (10) ◽  
pp. 2177-2202
Author(s):  
Rui Li ◽  
Jianxin He ◽  
Shunxian Tang ◽  
Fang Miao ◽  
Xingang Fan
Keyword(s):  
Solid State ◽  
Peak Power ◽  
Pulse Compression ◽  
Weather Radar ◽  
High Peak Power ◽  
Doppler Weather Radar ◽  
Compression Technique ◽  
Radar Systems ◽  
X Band ◽  
Quality And Reliability

AbstractSolid-state weather radar transmitters offer great potential for increased reliability and maintainability, which have been proven to be critical for practical use. Although they have been implemented in radar systems, solid-state transmitters are incapable of producing as high peak power as available in klystrons. The pulse compression technique coupled with mismatched methods allows for low peak-power transmission and can improve the range-resolution and detection performance on the receiving end of a radar system. However, applying solid-state transmitters with pulse compression in weather radar systems still requires strong evidence for data reliability. With side-by-side observational experiments, this study compares a solid-state weather radar with the combined-pulse transmission mode to a close-by klystron Doppler weather radar in an attempt to 1) analyze the capability of the solid-state radar to reduce the near-range blind zone and 2) validate the quality and reliability of data from a solid-state radar that is implemented with the pulse compression technique. The data from the klystron Doppler weather radar are considered accurate and are used as a reference for quantitatively evaluating the solid-state radar data quality and reliability. Comparisons and statistics show that the observations from the solid-state radar are consistent with that from the klystron Doppler weather radar, especially in heavy rainfall. Results from the analysis indicate that the solid-state weather radar has high estimation accuracy in both near and far ranges.

scholarly journals ANALYZING EXISTING APPLIED MODELS OF THE IONOSPHERE FOR CALCULATING RADIO WAVE PROPAGATION AND POSSIBILITY OF THEIR USE FOR RADAR SYSTEMS. I. CLASSIFICATION OF APPLIED MODELS AND THE MAIN REQUIREMENTS IMPOSED ON THEM FOR RADAR AIDS

2020 ◽  
Vol 6 (1) ◽  
pp. 86-96
Author(s):  
Oleg Aksenov ◽  
Stanislav Kozlov ◽  
Andrey Lyakhov ◽  
Vyacheslav Trekin ◽  
Yuriy Perunov ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Radio Wave ◽  
Radio Wave Propagation ◽  
Field Of View ◽  
Ionospheric Correction ◽  
Radar Systems ◽  
X Band ◽  
Horizon Problems ◽  
Full Classification

We review modern HF–X band radars covering over-the-horizon problems. The ionosphere significantly affects wave propagation in all the bands. We describe available correction techniques, which use additional evidence on the ionosphere, as well as models of different degrees of complexity. The fact that the field of view cannot be covered by ground-based instruments as well as the growing requirements to the precision and stability of the radars result in the impossibility of ionospheric correction with up-to-date models, hence the latter require further elaboration. We give a virtually full classification of the models. The article summarizes the requirements to the models for the radars depending on their function.

scholarly journals Coherent backscatter enhancement in bistatic Ku-/X-band radar observations of dry snow

2021 ◽  
Author(s):  
Marcel Stefko ◽  
Silvan Leinss ◽  
Othmar Frey ◽  
Irena Hajnsek
Keyword(s):  
Electromagnetic Waves ◽  
Bistatic Radar ◽  
Water Ice ◽  
Enhanced Backscattering ◽  
Radar Systems ◽  
X Band ◽  
Solar System Bodies ◽  
Coherent Backscatter ◽  
Ku Band

Abstract. The coherent backscatter opposition effect (CBOE) enhances the backscatter intensity of electromagnetic waves by up to a factor of two in a very narrow cone around the direct return direction when multiple scattering occurs in a weakly absorbing, disordered medium. So far, this effect has not been investigated in terrestrial snow in the microwave spectrum. It has also received little attention in scattering models. We present the first characterization of the CBOE in dry snow using ground-based and space-borne bistatic radar systems. For a seasonal snow pack in Ku-band (17.2 GHz), we found backscatter enhancement of 50–60 % (+1.8–2.0 dB) at zero bistatic angle and a peak half-width-at-half-maximum (HWHM) of 0.25°. In X-band (9.65 GHz), we found backscatter enhancement of at least 35 % (+1.3 dB) and an estimated HWHM of 0.12° in the accumulation areas of glaciers in the Jungfrau-Aletsch region, Switzerland. Sampling of the peak shape at different bistatic angles allows estimating the scattering and absorption mean free paths, ΛT and ΛA. In the VV polarization, we obtained ΛT = 0.4 ± 0.1 m and ΛA = 19 ± 12 m at Ku-band, and ΛT = 2.1 ± 0.4 m, ΛA = 21.8 ± 2.7 m at X-band. The HH polarization yielded similar results. The observed backscatter enhancement is thus significant enough to require consideration in backscatter models describing monostatic and bistatic radar experiments. Enhanced backscattering beyond the Earth, on the surface of solar system bodies, has been interpreted as being caused by the presence of water ice. In agreement with this interpretation, our results confirm the presence of the CBOE at X- and Ku-band frequencies in terrestrial snow.

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