Dai Huanyao

Analysis of influence on dynamic RCS simulation by target gesture

Modeling electromagnetic scattering property of dynamic target realistically is good for reproducing the dynamic characteristic, and is also the basis of dynamic radar target recognition. It will improve the model fidelity to make clear the influence on dynamic radar cross section (RCS) simulation by target gesture. In the flight, the attitude and position measurement error is modeled, and the attitude and position measurement stylebook is derived by simulation corresponding to the same track. Then, the electromagnetic computation results are given with the corresponding line-of-sight angle. At last, the different results above are compared, and the influence of pose measurement and position error is analyzed. The analysis results provide theoretical basis and support for dynamic radar target recognition.

Response analysis of monopulse radar under retrodirective and non-retrodirective cross-eye jamming

With the development of the ECM technology, cross-eye jamming technique becomes more and more practical. In order to study ECCM method for this jamming, retrodirective cross-eye and non-retrodirective cross-eye were studied and analyzed. The mathematical model of monopulse radars sum signal and difference signal under cross-eye jamming is established and simulated. The simulation results show that the retrodirective cross-eye jamming will not affect the response shape of sum beam, while non-retrodirective cross-eye will lead to zero in sum beam. Both retrodirective cross-eye and non-retrodirective cross-eye jamming will lead to distortion of received difference beam pattern of monopulse radar, resulting in abnormal monopulse ratio. The closer the distance between interference source and monopulse radar, the decoying ability of cross-eye jamming is stronger, and the angle range of abnormal monopulse ratio will be greater.

An architecture for frequency hopping cognitive radio networks

The radio frequency (RF) spectrum is a limited resource. Spectrum allotment disputes stem from this scarcity as many radio devices are confined to a fixed frequency or frequency sequence. One alternative is to incorporate cognition within a reconfigurable radio platform, therefore enabling the radio to adapt to dynamic RF spectrum environments. In this way, the radio is able to actively observe the RF spectrum, orient itself to the current RF environment, decide on a mode of operation, and act accordingly, thereby sharing the spectrum and operating in more flexible manner. This research presents a novel framework for incorporating several techniques for the purpose of adapting radio operation to the current RF environment.