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This paper describes the measurement data preprocessing, tracking coordinate system and the tracking algorithm of the multiple-target tracking (MTT) in heliborne radar. The computer simulation results and the realization test of helicopter platform indicate that the MTT algorithm put forward in this paper are efficient and feasible, It well fits for the tracking precision and the real-time demand...
Absorption coefficience of Tm3+ ions in Tm3+/Yb3+ codoped tellurite glass have been analyzed by using the J-O theory. The J-O parameters are calculated to be Ω2 = 11.11×10−20 cm2, Ω4 = 3.5×10−20 cm2 and Ω6 = 3.6×10−20 cm2. Spontaneous radiative transition probabilities, branching ratios and radiative life time of Tm3+ ions are also calculated, the calculation results indicate that it is difficult...
In this paper, spectroscopic properties of Tm3+/Yb3+ codoped tellurite glass were analyzed by J-O theory. The glass was pumped by 808nm and 980nm laser respectively. Results indicate to Tm3+/Yb3+ codoped glass, 980nm laser can be a good pump source to get a laser working in 1.4µm.
Band gaps of 2D piezoelectric phononic crystal and the influence of material constants are studied. Dispersive equations of 2D phononic crystal with piezoelectric ceramic cylinders embedded periodically in polymer host are derived based on plane wave expansion method firstly. Then, dispersive equations are numerically solved and the wave band gap distribution is obtained in the first Brillouin zone...
A 2.4 GHz linear CMOS power amplifier (PA) for OFDM WLAN application in 65 nm CMOS technology is presented. The cascode PA operating from 3.3 V employs the proposed asymmetric lightly doped drain MOSFET (A-LDD) structure as common-gate stage to sustain large signal stress and 1.2 V core device as common source stage to provide high frequency operation. Beside, dynamic bias technique is used not only...
A method to interrogate fibre Bragg grating vibration sensor by narrow line width light is demonstrated; the interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an FBG moves due to the strain which applied on the sensor. The sensor's response to acceleration frequency...
Fiber optic methane gas detecting system based on distributed feedback (DFB) laser wavelength scanning technique is demonstrated. Wavelength scan of methane absorption peak at 1665.9 nm is realized by saw tooth modulation of current which is injected to DFB laser. A reference methane gas cell is used to find the methane absorption peak around 1666 nm, and normalization is used to reduce the outside...
A 2.4 GHz fully-integrated MISO transceiver consisting of two receivers and one transmitter is implemented in 0.18 mum CMOS technology. To alleviate the cost of external front-end components, the RF transmit/receive (T/R) switch and a power-efficient linear CMOS PA are fully integrated on-chip. It shows 3.5 dB low noise figures in the receivers respectively. Also, the transmitter delivers an average...
We have developed an electromagnetic cavity resonator based RF sensor for online determination of granular dielectric materials weight. This sensor is non-instrusive and detects the density of the granular materials using resonant peaks captured instantaneously. A laboratory prototype of the RF sensor has been constructed. The properties of the RF cavity were simulated by ANSYS, and confirmed using...
We present a topology to provide tolerate quadrature signals in a MB-OFDM UWB frequency synthesizer. This frequency synthesizer is modified to replace a RC-CR network (RC-CR phase shifter) with a frequency division network (dual-mode divider), eliminating amplitude and phase errors of the RC-CR network. The proposed topology obtains superior suppression of image sideband of -15.5 dB when mismatches...
A fully integrated transmitter front end with on-chip power amplifier (PA) in 0.18 um CMOS technology is presented. The on-chip PA employs dynamic bias technique to reduce power consumption and enhance linearity. In the measurement, it reveals the output PldB of the PA is 26.5 dBm. Also, the transmitter delivers an average power of 17.3 dBm with EVM of -28.1 while drawing 225 mA of DC current (PA...
The reliability properties of NOR flash memory with 65nm node being developed in Samsung electronics are greatly improved by using the newly proposed re-oxidized tunnel oxide. Especially, by optimizing the process variables such as the re-oxidation thickness/time, the partial pressure of NO during annealing, and the kinds of re-oxidizing materials, the Vth shifts post cycling and after post-cycling...
A fully-integrated direct-sequence spread-spectrum (DSSS) CMOS transceiver for 2.4-GHz ISM band is presented. It integrates a RF transceiver, a frequency synthesizer, baseband filters, digital signal processing, an adaptive differential pulse-code modulation (ADPCM) codec, and a programmable PA pre-driver. The transceiver chip achieves a measured sensitivity of -103 dBm and an output power of 3 dBm...
We present an efficient MPEG-4-based interactive player for PDA-like embedded devices in this paper. Our system can receive media from various sources, then decompress and compose them in an object-oriented manner. Embedded devices such as PDA usually have limited computational resources, memory size, power budgets, and multimedia capabilities. To overcome these constraints, two novel mechanisms were...
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