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Reliable and accurate propagation path loss prediction between radar radiant sources and susceptive equipments necessitates a good understanding of electromagnetic wave scattering in the presence of inhomogeneous atmosphere near sea, and this is one of the major issues in ship fleet electromagnetic compatibility literature. For sake of this reason to solving the far field of the radar radiant source...
Numerical simulation can quantitatively depict the effect of jamming on the performance of TDLCS (tactical data link communication system). In this paper, main configuration and working principle of TDLCS are presented. Thus anti-jamming techniques such as MSK modulation/ demodulation and DSSS are introduced. Then the three typical modes of jamming and their characteristics are dwelt on. The anti-jamming...
Main interference sources for electro-magnetic sensitive system in submarine platform are usually LF (low-frequency) electromagnetic radiator like high-power cable or cabinet in cabin. The characteristic and problem of radiated EME (electromagnetic environment) from cable and cabinet was analyzed, and a hybrid simulation method of EME from cable based on MoM (method of moments) and MTL (methods of...
The impact of interference on tactical data link communication system (TDLCS) can be quantitatively described through anti-jamming performance simulation. Therefore, anti-jamming performance simulation of TDLCS is of special interest. The basic structure and principle of TDLCS were introduced. And then the MSK modulation/demodulation and direct sequence spread spectrum (DSSS) techniques were analyzed...
The impact of interference on tactical data link communication system (TDLCS) can be quantitatively described through anti-jamming performance simulation. Therefore, anti-jamming performance simulation of TDLCS is of special interest. The developing status of TDLCS and its simulation technique were introduced. Furthermore, the key anti-jamming techniques of Joint Tactical Information Distribution...
This paper presents a “top-down” pre-design method of electromagnetic compatibility for ship platform. Through constructing the energy-transfer model and relating matrix of the being interfered systems at the stage of concept-design of new ship, we can use numerical electromagnetic simulation, behavioral model, simulated testing, and data statistics method to evaluate the whole-all electromagnetic...
The low-frequency electromagnetic radiation of cabinet has became the main interference source for electromagnetic sensitive system. The feature of interference sources in cabinet was analyzed, and the electric dipole is considered as the equivalent interference source. Then, considering the low-frequency radiation characteristic, the low-frequency MoM is used to simulate the electromagnetic environment...
As a novel simulator used for EMC testing, broadband gigahertz field simulator (BGF) was invented by podgorski et al. for simultaneous testing in dual polarization of emission and susceptibility. However, the dimensions and mechanism of BGF are still undisclosed in details. According to podgorski's designing, we had designed the BGF model for vertical polarization emission and susceptibility testing...
The model of the shipboard cabin was developed and the electromagnetic environment (EME) in it was simulated by using the electromagnetic field analysis software FEKO. The EME in the shipboard cabin varying with the number of antennas on deck, the distance between the antenna and cabin, and the transmitting power of antennas was obtained, and their dependent relations were also presented. The results...
Based on the physical optics (PO) and the principle of impedance boundary condition ( IBC ) with Left-Handed Materials, a numerical method is described to analyze the near-field EM scattering from targets coated with medium. For typical targets such as a metal plate covered with radar absorbing materials (RAM) in far field and a missile coated with RAM having Left-Handed Materials in near field, the...
The Electromagnetic susceptibility (EMS) of cathode ray tube (CRT) display for computer was investigated preliminarily using the test method of bulk current injection (BCI). During the test, CW signals as electromagnetic interference (EMI) signals with different amplitude at a certain frequency were injected into the RGB, horizontal synchronization (HS) and vertical synchronization (VS) signal line...
The basic structure and principle of data link communication system (DLCS) were introduced. And then the RS error-corrected coding/decoding and MSK modulation/ demodulation techniques were analyzed. The anti-noise performance of DLCS in Gaussian white noise channel was studied. Moreover a model of DLCS with RS coding/decoding was developed based on Simulink in Matlab. The simulation results were verified.
The multilevel fast multipole moment method (MLFMM) is employed to compute the electric and magnetic field shielding effectiveness of a normal case with a classic rectangular aperture. The calculated values of shielding effectiveness by MLFMM are in good agreement with measurements and calculated data by Transmission Line Method (TLM). In addition, the variation characters of shielding effectiveness...
It has been over 10 years since the military standards GJB151A/152A were published in 1997. Thus their applicability is worth studying, such as the item of RS103 used for surface ship. The model of the shipboard cabin was developed and the electromagnetic environment (EME) in it was simulated by using the electromagnetic field analysis software FEKO. The EME in the shipboard cabin varying with the...
Response characteristic of EMI test receiver RF front end was numerically modeled using the computing software Matlab. With the numerical model, the receiver IF response envelope of different pulse was simulated based on the requirement in the military standard GJB 152A. The simulated results may provide help for better understanding the performance parameters and operating the receiver, and also...
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