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This paper proposes the method for solving large scale flight conflicts among multi-aircraft during the pre-tactical phase. Under the concept of the Trajectory-Based Operations (TBO), each aircraft is assigned a 4D trajectory to track. Therefore, with the position information obtained from the predicted 4D trajectory, potential conflicts are required to be resolved during the pre-tactical phase instead...
A 320 GHz on-chip 2 × 2 antenna array employing a compact feeding network is presented in this paper. The feeding network is designed based on the conducted-back coplanar waveguide (CBCPW) transmission line with a compact size, which has the full shielding performance providing good isolation from circuits around or below the CBCPW transmission lines. The proposed on-chip feeding network and antenna...
Air traffic complexity is an essential indicator to evaluate the air traffic situation within one given airspace, with respect to both the workload of traffic control and the degree of operational safety. In practice, it is helpful for airspace reconfiguration and air traffic flow management. Hence, identifying an accurate method for air traffic complexity evaluation is important. Considering there...
The vehicular networks relying on the intelligent transportation system, is the production of the modern vehicle entering into the information era, and it has important application on reducing the traffic congestions and traffic accidents. As the key technology of the communication of vehicular-road and vehicular-vehicular realization, Dedicated Short Range Communication (DSRC) is widely used in the...
This paper presents an Integrated on-chip bandpass filter design using an inverse-coupled resonator. Both the resonator and bandpass filter are designed and fabricated in a standard silicon-germanium technology. The designed resonator is based on a unique structure, which consists of two broadside-coupled meander lines with opposite orientation. Using this structure along with capacitors, the bandpass...
A low power cross-coupled bandgap voltage reference is proposed in this paper. Based on the suggested structure, a 9.8 ppm/°C temperature coefficient bandgap voltage reference across −50°C to 150°C temperature range with 1.8-V supply voltage is achieved. For the help of the proposed cross coupled structure bandgap voltage reference, start-up circuit can be waived from which can save both area and...
An ultra-compact integrated resonator and bandpass filters (BPF), in silicon-based technology, are presented for millimetre-wave applications. The resonator consists of two broadside-coupled lines in opposite orientations. Using this resonator, a first-order and a second-order BPFs were also designed. To prove the concept, three prototypes of each of the resonator and the first-order BPF were fabricated...
To satisfy the Square Kilometre Array's (SKA) frequency dissemination requirement, Tsinghua University designed a “1f-2f” frequency dissemination system. Compared to the former frequency dissemination system, it has better expandability which can support the star topology frequency dissemination network. In order to get the specifications as well as to find the potential problems of the frequency...
We proposed a 1f–2f actively compensated frequency synchronization system with phase noise compensation function placed at the receiving site. During the application, we found that this system is sensitive to ambient temperature of fiber link so that the phase fluctuation cannot be completely compensated. It is caused by the nonlinear effect of RF components in the system. We optimize the 1f–2f frequency...
A compact transformer balun with less than 0.13 dB magnitude imbalance and 0.4° phase imbalance from 7 to 15 GHz is presented. The balun is suitable for use with frequency doublers using a balanced circuit architecture. Measured data for the balun is used to predict the harmonic rejection of the frequency doubler. The fundamental rejection is 29 dB and third harmonic rejection is better than 35 dB...
Among various parameters impacting on the performance of UV camera for daytime corona inspection, the solar-irradiated leakage (SIL) is the most influential one according to the BLUP theory. The minimum detectable corona is limited by equation. In this paper, a series of UV filters are used to represent different SIL levels on a clear day. After a UV filter with a transmittance of 10−13 above 300...
Silicone rubber materials have been widely used as external insulation for power systems due to their good hydrophobicity and hydrophobicity transfer. However, pollution flashover accidents of composite insulators occurred from time to time in recent years. The influence of environmental condition on hydrophobicity and hydrophobicity transfer property of silicone rubber material needs further research...
Being able to monitor a large area is essential for intelligent warehouse automation. Complete depth map of aslant floor allows Automated Guided Vehicles (AGV) to navigate the environment and safely interact with nearby people and equipment, eliminating the need for installation of guide tracks and range sensors on individual robots. A single camera does not have sufficient field of view irresolution...
A transformer-coupled frequency quadrupler with 50% bandwidth is designed in a 0.25μm SiGe process. The quadrupler covers an output frequency range from 36GHz to 60 GHz with a total power consumption of 38.5mW for a supply voltage of 2.5V. To fulfil the requirement of harmonic suppression, a novel on-chip asymmetrical Marchand balun structure is adopted to compensate the phase and amplitude errors...
A reconfigurable programmable-gain amplifier is presented in this paper. The designed PGA has two major advantages over the conventional designs: The gain step of the designed PGA can be adjusted by an analog-controlled voltage so that the trade-off between gain error and gain range can be relaxed; the power consumption of the PGA is binary-weighted, and thus the power efficiency is maximized. To...
We present two RF frequency dissemination methods (active and passive phase fluctuation compensation) for branching network. For the active one, the phase noise compensation function placed at the client site. One transmitting module hence can be linked with multiple client sites. For the passive one, without any phase control on the disseminated rf signals or usages of active feedback loop, the highly...
Model Driven Engineering (MDE) is a proven approach to improve software development processes by automation. However, traditional development of MDE tooling requires a high upfront cost. Recent developments in language workbench technologies promise to significantly reduce these investment costs. By providing domain experts with targeted projections, the speed and quality of delivering customer value...
A CMOS fifth-order Gm-C elliptic lowpass filter based on the voltage-mode multiple loop feedback (MLF) leap-frog (LF) configuration is designed. The filter is implemented using a fully-differential linear operational transconductance amplifier (OTA). PSpice simulations using a standard TSMC 0.18µm CMOS process with 1.8V power supply have shown that the cut-off frequency of the proposed filter can...
This paper outlines the popular circuit tuning strategies reported for the implementation of reconfigurable low-noise amplifiers (LNAs). It presents a continuously-tuned LNA intended for multi-standard applications as well as enhancing the yield of conventional narrowband LNAs. The presented LNA is designed and implemented in a 0.25μm silicon-on-sapphire (SOS) CMOS process. It uses MOS-varactors at...
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