In the paper,the principles and characters together with usages of the passive interference technology of radar are introduced; the performances of equipments of the passive interference system are described;several technique puzzles in this field are discussed;the trends of progress in the passive interference technology of radar are widely analyzed.

The interference of Ultra-high-voltage(UHV) AC transmission line(TL) to AM receiving station can be classified to active interference and passive interference.

The passive interference in receiving station of amplitude modulation (AM) broadcasting from UHVAC transmission lines is mainly caused by towers.

Analysis of passive jamming against millimeter-wave SAR in UAV;

A brief analysis of the technologies of millimeter-wave radars and passive jamming;

Dilution jamming is an important measure for the anti-missile operation of shipboard passive jamming equipment.

According to the theory of noninterference information flow,a kind of noninterference security model is put forward based on access security of terminal.

In information flow control, the security policy is often formalized as noninterference polices, which requires that confidential inputs not affect the publicly visible outputs.

Built upon noninterference,the method was firstly used to calculate the covert channel capacity,then to analyze the factors that had an impact on this quantity.