How to compute a slot marker — Calculation of controller-managed spacing tools for efficient descents with precision scheduling

This paper describes the underlying principles and algorithms for computing the primary Controller-Managed Spacing (CMS) tools developed at NASA for precisely spacing aircraft along efficient descent paths. The trajectory-based CMS tools include slot markers, delay indications and speed advisories. These tools are one of three core NASA technologies integrated in NASA´s ATM Technology Demonstration-1 (ATD-1) that will operationally demonstrate the feasibility of fuel-efficient, high throughput arrival operations using Automatic Dependent Surveillance-Broadcast (ADS-B) and ground-based and airborne NASA technologies for precision scheduling and spacing.