In the classical tracking-by-detection (TBD) paradigm, detection and tracking are separately sequentially conducted, data association must be properly performed to achieve satisfactory performance. this paper, a new end-to-end multi-object framework is proposed, which integrates object into single model. The proposed eliminates complex process in TBD requires no additional training. Secondly, regression confidence of historical trajectories investigated, possible states trajectory (weak or...

A W-band folded waveguide traveling wave tube (FWTWT) with lowered 19.4-kV operation voltage and improved gain flatness was investigated developed. In this article, design methodology, fabrication, test results were presented discussed. Two kinds of slow-wave circuits the positive negative period stepping chosen to carry out contrastive study. automatic measurement code independently developed, FWTWT fabricated by LIGA method. The showed that a saturated output power greater than 87 W in...

Gyrotron performance is sensitive to cavity structure parameters, and the shape temperature dependent due thermal deformation induced by rise from ohmic loss power on finite-conductivity wall. Accordingly, this paper studies a frequency-tuning scheme for terahertz gyrotron properly controlling deformation. By combining nonlinear theory finite-element method software, controllable thermal-frequency-tuning capability of continuous-wave 263-GHz systematically investigated, toward maintaining...

A design of CW 10 W W-band folded waveguide TWT is investigated and the designed electron optics, interaction section coupling system are described. Finally simulation results show that can reach required power output.

A W-band efficiency-improved Traveling Wave Tube(TWT) that adopts a optimized multi-pitch folded waveguide slow wave structure and coupler geometry is reported in this paper. Test results showed voltage standing ratios(VSWRs) 90-100GHz range are less than 1.367 electronic efficiency 92.5 GHz was raised to 6.1% 90 ~ 96GHz they were higher 3.5% with stable power output.

In currently available literature, no tracking-by-detection (TBD) paradigm-based tracking method has considered the localization confidence of detection boxes. most TBD-based methods, it is that objects low are highly occluded and thus a normal practice to directly disregard such or reduce their priority in matching. addition, appearance similarity not factor consider for matching these objects. However, terms fusing classification localization, may have inaccurate but clear appearance;...

The measurement system reported here is intended for use in determining the current density distribution of electron beams from Pierce guns TWTs. was designed to automatically scan cross section beam and collect high-resolution data with a Faraday cup probe mounted on multistage manipulator using LabVIEW program. A 0.06 mm thick molybdenum plate pinhole as assembly employed sample 0.5 µm space resolution. thermal analysis pulse heating discussed. 0.45 µP gun expected minimum radius 0.42...

The linearity of the traveling-wave tube is a very important characteristic for modern communication system. To improve at no expense saturated output power and overall efficiency, modified pitch profile combined with small adjustment operating parameters proposed. optimal design helix circuit evaluated theoretically by large signal analysis, experimental test also carried out to make comparison performance between novel original designed tubes. experiments show that powers efficiencies...

Q-band traveling-wave tubes (TWTs) with high efficiency and power will be needed for high-data rate broadband communications in next-generation satellite communication systems. According to the key technical problems difficulties development of helix TWTs, this article presents a design strategy high-efficiency high-power TWTs. A TWT was successfully manufactured on basis strategy, test results indicate that can operate at up 120-W continuouswave output 49.9% minimum overall over 41.5-45.5...

Attenuator has been designed to meet the strict requirements in W-band for folded waveguide TWT. Synthetical analysis of parameters is carried out, and using microwave studio simulation results show design good performances. Fabrication technology test system are progress develop practical attenuator.

We have built an ion treatment system for TWT multistage depressed collectors (MDCs), and investigated the process secondary electron emission (SEE) suppression. It is found that SEE ratio oxygen-free high-conductive copper (OFHC) plates closely related to deposition rate of Mo surface texture. With optimized process, has been reduced a half untreated (OFHC).

A medium-power broadband-tuning terahertz (THz) gyrotron operating at low voltages is especially attractive for applications in biomedicine. This article tends to elaborate on the challenges related startup oscillation and ohmic loss suppression of an extremely low-voltage THz gyrotron. High interaction efficiency achievable by applying long transit time electrons compensate unfavorable decline beam-wave coupling strength low-energy electron beams. cavity structure which favors backward-wave...

Development of Ka-band TWTs at Institute Electronics, Chinese Academy Sciences (IECAS) are reported, include 50W space TWT and 200W high power helix TWT. The has 50% efficiency, good linearity, while TWTA (TWT+EPC) 45% efficiency. prototype have 250W CW output with 2GHz bandwidth, 150W over 30-40GHz.

An E-band 70W continuous wave folded waveguide TWT (CW FWTWT) was designed and fabricated. The measured results showed that beam transmission over 98% at dc better than 97% the highest peak RF power. Measured output powers are higher 76.7W with saturated gains 31.1dB within frequency range of 81-86GHz. This adopts single depressed collector total efficiencies 26.7%

A new 26.5-40 GHz helix-TWT with high efficiency has been developed at the Institute of Electronic, Chinese Academy Sciences, China. The main methods include optimization slow wave structure and large signal simulation, a special 5-stage multistage depressed collector to increase power recovery. test results show that this device an average 40 W, gain more than 38 dB, overall 37%.

Many recent biomedical applications use medium-power frequency-tunable terahertz (THz) sources, such as sensitivity-enhanced nuclear magnetic resonance, THz imaging, and treatment. As a promising candidate, low-voltage gyrotron can generate watt-level, continuous THz-wave radiation. In particular, the frequency-pulling effect in gyrotron, namely, of electron beam parameters on oscillation frequency, be used to tune operating frequency. Most previous investigations complicated time-consuming...

A double-grating rectangular waveguide with a round beam channel is proposed as the slow-wave interaction structure of 310GHz travelling wave tube (TWT). We describe fabrication slow and assembly method RF windows.

In this paper, a dual anode electron gun for Ka-band Space TWT has been simulated using MTSS code and measured the beam analyzer. order to determine differences between simulation measurement, dependence of current, waist radius throw on various BFE negative bias have analyzed. Measurement results compared with are presented.