Synchronization and channel estimation are two key techniques for OFDM systems to ensure its good performance.
为保证其具有好的性能，需要时频同步、信道估计等一系列的关键技术加以支持。
Pulse compression technique includes two key techniques: the pulse compression signal generation and processing.
脉冲压缩技术包括脉压信号的产生和处理两个关键的技术。
The paper discuss as two key techniques: city geographical information system(GIS), real time correction of the deviation.
文中详细讨论了系统所采用的两项关键技术：地理信息库系统、车辆位置的实时修正。
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