Radar system simulation features economy, flexibility, practicality, etc., it becomes key technique of the research of radar systems and ECM (Electronic Counter measures) systems.

雷达系仿真技术所具有的经济、灵活和实用的特点，使其逐渐成为雷达系统和电子对抗系统研究中的一项关键技术。

youdao

In the past, DirecTV has tried a variety of more conventional approaches to fighting piracy, including cooperating with law enforcement to bust black market distributors and taking various electronic counter measures, or ECMs. In January, DirecTV instructed its satellites to send an ECM known as a "card kill" on Super Bowl Sunday.

FORBES: DirecTV Declares War On TV Pirates