San Ramon, CA, United States
San Ramon, CA, United States

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Jeong J.-C.,Broadcasting and Telecommunications Media Research Laboratory | Jang D.-P.,Broadcasting and Telecommunications Media Research Laboratory | Han B.-G.,Radar Corporation | Yom I.-B.,Broadcasting and Telecommunications Media Research Laboratory
ETRI Journal | Year: 2014

A C-band 50 W high-power microwave monolithic integrated circuit amplifier for use in a phased-Array radar system was designed and fabricated using commercial 0.25 μm AlGaN/GaN technology. This two-stage amplifier can achieve a saturated output power of 50 W with higher than 35% power-Added efficiency and 22 dB small-signal gain over a frequency range of 5.5 GHz to 6.2 GHz. With a compact 14.82 mm2 chip area, an output power density of 3.2 W/mm2 is demonstrated. © 2014 ETRI.


Zhang H.,Radar Corporation | He T.,Radar Corporation | Chen D.,Radar Corporation
Shuju Caiji Yu Chuli/Journal of Data Acquisition and Processing | Year: 2012

Since radar signals are modulated by rotor blades shadowing and helicopter vibration, the helicopter-borne synthetic aperture radar (SAR) imaging is difficult. Therefore, modulation reasons are analyzed and investigated based on time-frequency method. The modulation phase errors are extracted from the dechirped data and then compensated to remove modulation. Subsequently, the phase gradient autofocus is performed to achieve a high quality SAR image. The method has great reference value to the helicopter-borne SAR imaging.


Liu X.-Y.,Northwestern Polytechnical University | Li Y.,Northwestern Polytechnical University | Cheng Y.-F.,Radar Corporation
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2012

In order to analyze the characteristic of turbulence, detect the signal of turbulence efficiently and further research the influence of the ground clutter on detecting turbulence, the corresponding turbulence model is established. The wind speed and spectral width of the turbulence echo signal are computed and simulated by using the fast Fourier transform (FFT) algorithm. A new FFT algorithm used for turbulence signal processing is proposed, where the wind velocity and spectrum width of the turbulence, the minimum signal detection threshold and relevant variables are newly defined. The simulation results show that the wind speed of turbulence has a pulsative feature, and the FFT algorithm can perfectly estimate the distribution of wind speed in the wind field of turbulence. The wind speed and spectral width of the echo signal of turbulence under a non-ground clutter condition are superior to that with ground clutter conditions.


Li Y.,Northwestern Polytechnical University | Liu X.-Y.,Northwestern Polytechnical University | Cheng Y.-F.,Radar Corporation
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2013

In order to analyze the generating mechanism of turbulent flow of airborne radar and the variational laws with dimension and without dimension, the three dimensional zero mean Gaussian noises are produced by using the three-dimensional symmetric characteristics of fast Fourier transform (FFT). Combined with the Von Karman model the space three-dimensional turbulent flow model is produced and the airborne radar turbulence signal processing algorithm is presented. The turbulence scale and turbulence intensity are considered in turbulent flow simulation. The simulation results show that the three-dimensional turbulent flow is suitable for the actual situation, which can meet the actual flight real-time simulation. In addition, the variational law of turbulence with dimension is basically identical with one which is without dimension, but its amplitude of fluctation is larger than the latter.


Li J.-Y.,University of Science and Technology Beijing | Zhao P.,Radar Corporation | Yanagimoto J.,University of Tokyo | Sugiyama S.,University of Tokyo | Chen Y.-L.,University of Science and Technology Beijing
International Journal of Minerals, Metallurgy and Materials | Year: 2012

Nitrogen can increase the strength of steels without weakening the toughness and improve the corrosion resistance at the same time. Compared with conventional nitrogen-free die steels, a new type of nitrogen-containing die steel was developed with many superior properties, such as high strength, high hardness, and good toughness. This paper focused on the effects of heat treatment on the microstructures and mechanical properties of the new type of nitrogen-containing die steel, which were investigated by the optimized deformation process and heat treatment. Isothermal spheroidal annealing and high-temperature quenching as well as high-temperature tempering were applied in the experiment by means of an orthogonal method after the steel was multiply forged. The mechanical properties of nitrogen- containing die steel forgings are better than the standard of NADCA #207-2003. © University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2012.


Patent
Radar Corporation | Date: 2014-03-12

A golf data collection system can use a near field communication system in a data processing application to record golf club identifiers and golf strokes, taken (with the identified club) at GPS identified positions.


Patent
Radar Corporation | Date: 2012-10-02

Methods and systems for managing golf clubs and for collecting golf data, such as golf strokes, are described. In one embodiment, a golf data collection system includes a golf accessory worn on the golfers wrist, such as a watch, equipped with a GPS receiver, impact sensing and motion sensing means, and a transceiver to communicate with golf club tags (e.g. at 2.4 GHz such as Bluetooth). The golf accessory senses the motion of the golf club being swung by the golf and/or senses the impact of the golf club striking the golf ball. When swinging motion or impact is sensed the device uses the transceiver to communicate with golf club tags. The closest golf club (i.e. the club in the golfers hand during the swing) is captured as the club used by the swing based on RSSI (Received Signal Strength Indicator). Other embodiments are also described.


Patent
Radar Corporation | Date: 2014-01-10

Methods and apparatuses related to golf club grips with attached or embedded RFID tags are described. In an embodiment, a RFID tag is attached to or embedded into a golf club grip and a RFID reader incorporated into a personal computing device may read or capture information associated with the RFID tag. The device may be configured to provide notifications to the golfer based on the captured information.


Patent
Radar Corporation | Date: 2013-12-20

Methods and apparatuses related to golf club grips with attached or embedded RFID tags are described. In an embodiment, a RFID tag is attached to or embedded into a golf club grip in a manner that does not compromise either the functionality or aesthetics of the grip. In an embodiment, the embedded or attached RFID tag is located in the butt-end of the grip, perpendicular to the shaft of the golf club.


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