Читать книгу Position, Navigation, and Timing Technologies in the 21st Century - Группа авторов - Страница 115

The quality of the GNSS navigation solution is determined by both the pseudorange measurement noise statistics and the spatial geometry of GNSS SVs. GNSS position solutions suffer from a relatively high vertical estimation uncertainty due to the lack of GNSS SV angle diversity (SVs are usually above the receiver). To address this, an external sensor (e.g. a barometer) is typically fused with a GNSS receiver. Cellular towers are abundant and available at varying geometric configurations unattainable by GNSS SVs. For example, BTSs could be below an aerial vehicle‐mounted receiver. Therefore, fusing cellular signals with GNSS signals would yield a more accurate navigation solution, particularly in the vertical direction. This section highlights the benefits of fusing cellular signals with GNSS signals.

This section is organized as follows. Section 38.8.1 studies the dilution of precision (DOP) reduction due to fusing cellular signals with GNSS signals. Section 38.8.2 shows experimental results with ground and aerial vehicles.