为了有效检测交通状况，提出了一种使用GNSS-R （导航卫星反射）信号进行车流检测的方法。该方法利用两种天线分别接收导航卫星直射信号和反射信号，使用通用接收机进行信号采集后，在软件接收机中进行信号处理解算，获得直射通道和反射通道的相关功率，以及卫星的高度角。然后使用反演介电常数的方法对车辆进行探测，获得交通车流状况。通过试验验证，该方法能够有效地对探测区域内的车辆进行检测，证明了使用GNSS-R进行交通车流检测的可行性。
In order to detect traffic conditions effectively, a new method of traffic flow detection using GNSS-R (Global Navigation Satellite System-Reflected) signals is proposed. In this method, the direct signals and reflected signals of GNSS are received by two types of antennas respectively and collected by an universal receiver.After signal processing in a SDR(Software Defined Receiver), the correlated power of direct channel and reflected channel, and also the satellites' elevation angles can be obtained. Then vehicles can be detected by the method of dielectric constant retrieving.Test results show that vehicles in the area can be detected effectively using this method, and prove the feasibility of traffic flow detection using GNSS-R signals.
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