Abstract
The NAVSTAR Global Positioning System is a space-based, all-weather, worldwide satellite navigation system. GPS uses the constellation of satellites and associated ground equipment to perform the primary missions of highly accurate navigation, time transfer, and nuclear detonation detection. To achieve these missions, GPS has three clearly defined segments – space, user and control (see Figure 1). The control segment, otherwise referred to as the operational control segment (OCS), consists of the personnel and equipment that controls the space segment and interfaces with the user segment. The OCS is made up of the master control station (MCS), the ground antennas (GA), and the monitor stations (MS). The purpose of this article is to describe how the 2nd Space Operations Squadron runs the MCS, the key element of the OCS.
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