Dai Huan-yao

Polarization property of scanning slot phased array

There are three typical definition of cross polarization in mechanical scanning antenna, and they are not completely proper for electronic scanning phased array antenna. We use wave-guide slot phased array antenna in this paper to study the changing of polarization property as beam scans in wide airspace. Simulation shows that the property of lobe and polarization changes not much in the case of small azimuth and elevation scanning angle. However, there is dramatic increase of cross polarization component in main lobe in the case of large scanning angle. We can use this characteristic to measure polarization property of target in phased array radar searching stage.

A novel approach of countering centroid jamming by using INS information in terminal guidance

During anti-ship missile (ASM) tracking ship in terminal guidance phase, echo in monopulse radar seeker receiver was generated by modeling chaff and ship as Swerling II and Swerling IV in chaff centroid jamming scenario, respectively. A generalized likelihood ratio test (GLRT) algorithm was then proposed for chaff detection in the main-beam. When the presence of the jamming was detected, one can combine target position forecast with inertial navigation system (INS) navigation solution to accomplish the homing guidance of ASM, and then when the absence of the jamming was detected, radar seeker capture and track target again, which could help achieve ones purpose of anti-jamming. Simulation showed that this method was effective and feasible due to its preferable anti-jamming performance.

A new far field measurement method for antenna polarization characteristics based on calibrator target

A new far-field measurement method of antenna is studied in this paper. The received signal model of antennas beam scanning the calibrator target has been built and the measurement method is considered. The full analysis formula and practical procedure was given. The validity of research work was demonstrated by processing the observational data and simulation. This can greatly reduce the development complexity and production cost of far field test, increased the fidelity at the meanwhile.

Efficiency evaluation model on the damage of radiation source by Anti-Radiation UAV

Establishing anti radiation UAV attack and locomotion model for addition radiation source to decoy anti radiation UAV. Making use of discrete and independency property of this mathematical model, it attained statistical sample, which can be used to making efficiency evaluation about UAV injures genuine emitter in the condition of energy unchanged. Giving the model of the most typically coherent dual and triplicate point source decoy anti radiation UAV , besides that carrying through simulation and experimentation of distributed spot, Definitude the main factor influence injures of enemy radar.