Position Authentication with Satellite-based Positioning

除了GPS之外，许多GNSS或全球导航卫星系统将在2020年之前开始服务。它提高了职位信息对社会和行业的重要性。例如，GNSS将使我们能够根据个别车辆的路线收取通行费。它是一种非常灵活的收费或征税制度，可以减少收费站的建设成本或交通拥堵成本。另一方面，随着职位信息变得越来越重要，我们可能会受到“职位作弊”的威胁，通过发送虚假的职位信息来逃避通行费或税收。我们开发了一种验证GNSS位置信息的方法，而无需对现有GNSS基础设施进行大规模修改或进行新的开发。方法是通过准天顶卫星系统（Quasi-Zenith Satellite System， QZSS）发送新定义的“RAND：参考认证导航数据”，并允许用户对接收到包含RAND的QZSS信号所创建的位置数据进行认证。这不会影响现有的GNSS或GPS服务，并且易于实现。我们成功地测试了一个实验系统处理由GNSS模拟器创建的信号。然而，由于QZSS地面站改造的延迟和成本，我们无法使用真正的卫星进行演示。

Many of GNSS or Global Navigation Satellite Systems in addition to GPS will start services until 2020. It enhances the importance of position information for society and industries. For example, GNSS will make it possible for us to collect tolls based on routes of individual vehicles. It is a very flexible toll or taxation system that can reduce the construction cost of or traffic congestion cost cause by toll gates. On the other hands, as position information become more critical, we may be threatened by “position-cheating” by sending fake position information to escape from toll collection or taxation. We developed a method of authenticating position information from GNSS without making large modification of the existing GNSS infrastructure or a new development. The method is to send newly defined “RAND:Referance Authentication Navigation Data” via QZSS (Quasi-Zenith Satellite System) and to enable users to authenticate position data created by receiving QZSS signal including RAND. This does not affect existing GNSS or GPS services and is easy to implement. We successfully tested an experimental system processing signals created with GNSS simulators. However, we could not conduct demonstration using real satellites due to the delay and cost of modification of the QZSS ground station.