高动态GNSS接收机导航数据采集完整性研究

Research on Integrity of Navigation Data Acquisited by High-Dynamic GNSS Receiver

摘要:

由于高动态GNSS接收机数据更新率高、数据量大,因而对高动态GNSS接收机导航数据采集的完整性提出了很高要求;针对上述要求,对高动态GNSS接收机导航数据采集完整性进行研究,设计了定时、事件触发和双缓冲3种导航数据采集方法;由于数据截断问题,定时方法的数据丢帧率为15.72%,适用于数据量少、更新率低的环境；事件触发方法虽然有效避免了数据截断,但由于缓冲区溢出,导致数据丢帧率为11.88%,适用于短时数据采集的环境；双缓冲方法有效解决了数据截断和缓冲区溢出问题,丢帧率为0,适用于高动态环境;最后,将双缓冲采集方法在高动态GNSS接收机导航数据采集中应用,结果证明所设计的采集方法能够高效完整地采集数据。

Abstract:

Due to the data characteristics of high rate and large amount of high-dynamic GNSS receiver, high demand of the integrity of navigation data acquisition is proposed. According to the demand, the acquisition integrity of navigation data is researched, three kinds of methods for acquiring navigation data which include timing, event triggers and double buffering is designed. Since the problem of data truncation, the data loss rate of timing method is 15.72%, which is applicable to the environment of less data and low rate; Although effective to avoid data truncation, the data loss rate of event trigger methods is 11.88% due to buffer overflow, which is applicable to the environment of short-term acquisition; Double-buffer method effectively solves the problem of data truncation and buffer overflow, thus data loss rate is 0, which is applicable to the high-dynamic environment. Finally, the method of double-buffer is applied to acquire navigation data of high-dynamic GNSS receiver. The results show that the method can acquire data efficiently and completely.