In them the target detection and tracking using the IR imaging technique is one of the symbol of modernization intelligent autoimmunization of modern weapon .

其中，利用红外成像技术来实现对目标的检测和 跟踪，是军事武器现代化、自动化和智能化的 重要 标志之一。

TDRSS represents a new direction in the international tracking telemetering and command field and is an important symbol of the developing level of the spatial science in a country .

TDRSS代表了国际上 测控领域的新的发展方向，是衡量一个国家航天科技发展水平和 实力的重要 标志。

In underwater acoustic communication carrier tracking and symbol synchronization are adversely affected by Doppler which is caused by the move between the transmitter and the receiver .

在水声通信中，收发双方存在相对运动时产生的多普勒频移将严重恶化 载波恢复和 符号同步。