Nowadays, a GNSS (Global Navigation Satellite System) sensor is one of the basic on-board pieces of equipment in an aircraft, enabling it to record many navigational parameters, such as position, speed, time, and rotation angle in real time. The GNSS sensor is therefore a universal tool in an era of development in the aviation sector, helping to improve the safety of aircraft flight. The GNSS satellite technique is applied and implemented in air transport, especially in the area of aerial navigation. Currently, for air navigation, the use of a GNSS sensor allows the use of many methods and techniques of GNSS satellite positioning, in both real time and in post-processing, such as monitoring the state of the atmosphere, researching the quality of GNSS positioning in aviation, and the implementation of the ABAS (Aircraft Based Augmentation System), SBAS (Satellite Based Augmentation System), and GBAS (Ground Based Augmentation System) in air navigation.

In the case of GNSS positioning in aerial navigation, aircraft coordinates can be determined using a variety of GNSS positioning methods. The most commonly used GNSS positioning methods in aviation include single point positioning (SPP), precise point positioning (PPP), single point positioning (PPP) supported by SBAS corrections, single point positioning (PPP) supported by IGS services, differential GNSS (DGNSS) technique, and real time kinematic differential methods in OTF mode (RTK-OTF). Atmospheric status monitoring in air navigation consists of determining the value of the atmospheric delay VTEC (Vertical Total Electron Content) and the tropospheric delay ZTD (Zenith Troposphere Delay), respectively. On the other hand, research on the quality of GNSS positioning in aviation enables the determination of parameters of accuracy, reliability, continuity, and availability. Advanced GNSS positioning algorithms in aerial navigation allow further development of the ABAS, SBAS, and GBAS.

The aim of this Special Issue is to gather research into the development of GNSS satellite techniques, and their applications to aerial navigation, in both real time and post-processing. Also of interest are papers looking at the performance parameters of GNSS sensors in aviation, as well as methods of improvement. We welcome both original research and review articles.

Potential topics include but are not limited to the following:

• The development of GNSS satellite techniques and positioning methods in real time and post-processing
• Absolute and differential GNSS positioning methods in aerial navigation,
• Estimations of accuracy, integrity, continuity, and availability parameters using GNSS sensors in aviation
• Monitoring of the VTEC ionosphere delay and ZTD troposphere delay for purposes of aerial navigation
• Improvement of the quality of GNSS satellite positioning in aviation based on ABAS, SBAS, and GBAS
• Adjustment processing of satellite kinematic data from GNSS sensors
• Multisensory integration in aerial navigation
• Multiple GNSS receivers in aerial navigation