An augmented reality view of Galileo satellites in the sky close to ESA’s technical centre in the Netherlands. It comes from a Galileo-focused satnav app for Android smartphones, developed by ESA engineers.
ESA开展了一项内部竞争，让学员开发一个能够仅使用伽利略卫星进行定位的应用程序。
“As part of our support for the competition, we developed our own app on a voluntary basis to serve as a benchmark,” explains Paolo Crosta of ESA’s Radio Navigation Systems and Technology section. “We included this augmented reality view, so users can ‘see’ the satellites their smartphone is using as they hold it up to the sky.”
The positioning calculations and assistance data functions for the app were developed by Paolo, with telecom engineer Tim Watterton contributing the main structure of the app, together with how it looks and its user interface.
Tim adds: “The satellites are overlaid in real time on the camera view in their predicted positions in the sky, based on ‘ephemeris’ information, assistance data that describes the current satellite orbits with high precision.
“当一个信号被娱乐eived, the satellite is shown in green, overlaying the predicted position. The satellite shown in red is one of the two placed in elongated orbits, but these satellites are expected to be used soon in the operational constellation. Satellites coloured orange are transmitting, but the signal is not detected, which may be due to obstruction by terrain or buildings.”
将手机放置在绿色卫星上，将手机放置在绿色卫星上，添加了有关它的其他信息，例如它的信号状态“伪范围”（信号传播到达接收器的未校正距离）加上卫星‘s manufacturer, launch date among other items.
The reference app is now being tested with the hope of making it publicly available on the Android Play Store. The trainees are also testing their own apps following the competition with the goal of releasing them.
轨道上有22个伽利略卫星，将于7月25日发射另外四颗卫星。
Filed Under:航空航天 +防御
