VANET在高速移动的环境中为节点提供高紧急性服务，鲁棒、精确的定位技术是VANET正常运转的基础。由于移动通信信号的泛在性，基于移动通信的VANET有广阔的前景。未来移动网络中的多天线与异构的网络架构，使信号到达角与能量成为容易获取的信息。基于能量与到达角融合的主动单点定位技术具有较大的潜力。但使用能量与到达角融合的定位方案，存在着几个技术挑战。首先，VANET节点在高速移动时，在接收端多个用户叠加后形成的时间选择性衰落，会导致感知发现信号出现频偏和多用户干扰，进而影响能量检测结果；其次，导频资源受限的天线设计使DOA精度无法达到定位要求。据此，本申请拟开展技术：1）能量与DOA融合的定位与跟踪技术；2）兼容OFDM、抗多普勒的CB-FMT波形设计及能量检测信号设计技术；3）基于稀疏天线阵列的高精度DOA算法，以保证定位精度达到系统的要求。

VANET could provide active safety, emergency rescue services of high urgency for nodes in high-speed mobile environment. Robust and precise positioning technology is the basis for the normal operation of VANET. Mobile communication signal will be ubiquitous in the future, and mobile network based VANET will be quite attractive. It is found that the DOA and RSS combined positioning method has large potential effect for VANET. Furthermore, the direction of arrival and received signal strength is easy to obtain because of the antenna array equipped by UE. So the research on DOA and RSS will be valuable. The DOA and RSS combined method has several technical challenges. First, VANET nodes move at high speed, the combined signal from several nodes will format a complex time fading channel, which will lead to the frequency offset and multi-user interference in beacon signal, thereby affecting the signal strength test; Second, pilot resource-constrained antenna DOA design leads to a DOA with low resolution which affects the positioning accuracy. Accordingly, this study will concentrates on the following technologies: 1) CB-FMT waveform design, which is compatible with OFDM but have better tolerance on Doppler; 2) high precision DOA algorithm based on sparse antenna array; 3) RSS and DOA combined positioning and tracking technology. The object is to ensure the positioning system could support the VANET usage.