Characteristics of Video Pulse Radar System Operating in the High Frequency Window at the Hazel A Mine Near Gold Hill, Colorado

1979 ◽  
Author(s):  
III Davis ◽  
Peters C. W. ◽  
L. Jr
Keyword(s):  
High Frequency ◽  
Radar System ◽  
Video Pulse ◽  
Pulse Radar ◽  
Frequency Window ◽  
System Operating

scholarly journals Southern Hemisphere Meteor Stream Determinations

1975 ◽  
Vol 28 (5) ◽  
pp. 591 ◽  
Author(s):  
G Gartrell ◽  
WG Elford
Keyword(s):  
Southern Hemisphere ◽  
Continuous Wave ◽  
Radar System ◽  
Radio Observations ◽  
Meteor Stream ◽  
Long Period ◽  
Pulse Radar ◽  
Comprehensive Search ◽  
Meteor Trails ◽  
System Operating

Meteor orbits have been deduced from radio observations of meteor trails carried out at Adelaide (latitude 35� S.), using a combined multi-station continuous wave and pulse radar system operating at 27 MHz. Observations were made for one week each month during the period December 1968 to June 1969, and also during October 1969. The orbits of 1667 meteors have been determined down to a limiting radio magnitude of + 8. The data have been systematically searched for stream meteors, and the significance of minor associations has been appraised. Altogether 40� 4 % of the orbits were found to be associated with at least one other orbit, and 29� 8 % with two or more. Numerous minor streams with high inclination and low eccentricity have been found at deep, southern declinations from December to March, with little activity in this quarter during June and October. In addition to confirming several previously established cometary associations, a comprehensive search has indicated that 34 of the meteor associations found may be related to 17 comets. Associations between several long-period comets and low-eccentricity high-inclination streams appear to be indisputable, and they confirm the origin of at least some of the 'toroidal group' meteors, previously a matter of some doubt.

scholarly journals Stationary Time Statistical Property of Ionospheric Clutter in High-Frequency Surface-Wave Radar

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Shang Shang ◽  
Kangning He ◽  
Zhaobin Wang ◽  
Xuguang Yang
Keyword(s):  
Surface Wave ◽  
High Frequency ◽  
Real Data ◽  
Radar System ◽  
Detection Performance ◽  
Frequency Selection ◽  
Statistical Property ◽  
Stationary Time ◽  
Wave Radar

In HFSWR (high-frequency surface-wave radar) system, the detection performance is impacted seriously by ionospheric clutter. Frequency selection is an effective method to avoid the effect of ionospheric clutter. The key to the method is the stationarity of ionospheric clutter over a period of time. This paper mainly researches the stationary time statistical property of the ionospheric clutter. A large number of real data including ionospheric clutter in HFSWR are processed and analyzed. It shows that ionospheric clutter in HFSWR has the characteristics of approximate stationarity within a period of time.

scholarly journals Resonance Scattering Detection Using the CSU–CHILL Dual-Wavelength, Dual-Polarization Radar

2019 ◽  
Vol 36 (7) ◽  
pp. 1177-1198
Author(s):  
Francesc Junyent ◽  
V. Chandrasekar ◽  
P. Kennedy
Keyword(s):  
Rayleigh Scattering ◽  
Resonance Scattering ◽  
Radar System ◽  
Dual Wavelength ◽  
Storm Events ◽  
Dual Polarization ◽  
Resonance Effects ◽  
X Band ◽  
The Difference ◽  
System Operating

AbstractThe CSU–CHILL radar is a dual-wavelength, dual-polarization weather radar system operating at S and X band with coaxial beams. This radar system offers a unique environment to develop and/or validate algorithms that cut across its wavelengths and polarizations. This paper presents a method to retrieve resonance scattering regions from the difference in intrinsic reflectivities after attenuation correction, which is performed using measured reflectivity fields only. The algorithm to retrieve these regions dominated by non-Rayleigh scattering is applied to different storm events, and the obtained data field capturing the difference in S- and X-band reflectivities due to resonance effects (which we will call Mie signal for convenience) is compared to the collocated dual-polarization fields. The obtained Mie signal is also compared to hail reports. In both cases, the retrieved Mie signal is found to be consistent with the rest of the dual-polarization data fields, and in some situations, it is shown to bring information not directly discernible from the usual dual-polarization radar variables.

Development of compact inductive coupled meander line RFID tag for near-field applications

2016 ◽  
Vol 9 (4) ◽  
pp. 757-764 ◽  
Author(s):  
Abhishek Choudhary ◽  
Krishan Gopal ◽  
Deepak Sood ◽  
Chandra Charu Tripathi
Keyword(s):  
Radio Frequency ◽  
Radiation Pattern ◽  
Radio Frequency Identification ◽  
High Frequency ◽  
Near Field ◽  
High Frequency Band ◽  
Rfid Tag ◽  
Frequency Identification ◽  
Meander Line ◽  
System Operating

The development of compact radio frequency identification (RFID) tag is the key requirement for wireless tracking of precious small size goods/packages in transport. A design of compact meander line tag antenna having inductive coupling feed is presented for RFID system operating at ultra high frequency band of865–867 MHz. The size of the proposed tag antenna is43 mm × 10 mm, and is designed using Higgs 4 IC chip (made Alien Technology, USA) having impedance of20.55− j191.45 Ωat centre frequency866 MHz.The antenna characteristics such as impedance, radiation pattern, bandwidth, and effect of ground on gain and tag size are analyzed and found to closely match with the simulated values. The observed value of reading range varies from87.5 to 35 cmsdepending on mounting on non-metal and metal packages, respectively.

Bi-Station Multi-Target Tracking Using Range and Doppler Measurements

2013 ◽  
Vol 329 ◽  
pp. 338-343
Author(s):  
Tian Jiao Fu ◽  
Li Guo Zhang ◽  
Jian Yue Ren
Keyword(s):  
Target Tracking ◽  
High Frequency ◽  
Radar System ◽  
Tracking Algorithm ◽  
Range Finding ◽  
Wave Radar ◽  
Multi Target Tracking ◽  
Actual Environment ◽  
Simulation Results ◽  
Ground Wave

The azimuthal measurements of the high frequency ground wave radar are poor in an actual environment, which can cause the plots highly decentralized and damage the formation of the over-the-horizon tracks. To solve the problem, a new radar system is proposed to triangulate target tracks using range and Doppler measurements only. On the basis of the analysis of the characteristics of the range-finding location, a multi-target tracking algorithm under non-clutter condition is given in this paper, which further improves the tracking algorithm of this system. Simulation results show the effectiveness of this method.

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