Position Authentication with Satellite-based Positioning

除GPS外，许多GNSS或全球导航卫星系统将在2020年前开始服务。它增强了位置信息对社会和行业的重要性。例如，全球导航卫星系统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税收制度，可以减少收费站的建设成本或交通拥堵成本。另一方面，随着位置信息变得更加关键，我们可能会受到通过发送虚假位置信息来逃避通行费征收或税收的“位置欺骗”的威胁。我们开发了一种验证来自GNSS的位置信息的方法，而不需要对现有的GNSS基础设施进行重大修改或进行新的开发。该方法通过QZSS(准天顶卫星系统)发送新定义的“RAND：参考认证导航数据”，使用户能够认证通过接收包含RAND的QZSS信号而产生的位置数据。这不会影响现有的全球导航卫星系统或全球定位系统服务，而且易于实施。我们成功地测试了一个处理用GNSS模拟器产生的信号的实验系统。然而，由于QZSS地面站的延迟和改装成本，我们无法使用真实的卫星进行演示。

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.