Table 2-1

Operational Requirements

Organizational Responsibilities

Differential Global Positioning System (DGPS) Navigation Service Concept
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Encl. (1) to COMDTTNST 16577.2

USCG DGPS CONOP

meter range based on individual harbor constraints within each DGPS broadcast coverage area.

Harbor/Harbor Approach

Vessel Traffic Services

10 meters

99.9%

NOAH Near Shore Surveying

15 meters

95.0%

Army Corps of Engineering

6 meters

98.0%

Integrity is provided by continuously monitoring critical performance parameters and automatically

alarming the user when these parameters are not being met. Each DGPS broadcast will be

monitored at the point of transmission and an alarm is automatically sent to the user within ten

seconds of a fault detection. Site monitor alarm thresholds can be set to ensure user accuracy

performance is available throughout the site's assigned coverage area. The Service goal is ZERO

false alarms and ZERO missed alarms.

Reliability is a function of both the Service failure rate plus that of the user's equipment. To

maximize DGPS service reliability the operational goal is that there will be NO unforecast Service

outages. In other words, during mission planning a user can rely on having the Service available if

a broadcast outage has not been advertised.

The Broadcast Standard for the USCG DGPS Navigation Service, COMDTINST M16577.1

provides detailed specification and description of broadcast signal parameters and content. The

document's appendices include site listings and assigned coverage areas.

2.3 Service Validation

Each site's integrity monitor will collect and forward data to the Control Station. The Control

Station database will be used to calculate each broadcast's performance. This evaluation will be

done on a monthly basis. Coverage in critical waterways will be validated by analyzing data

collected from far-field monitors. Any coverage "holes" will be investigated, documented, and

solutions sought.

2.4 Customer Feedback

The Control Station will log service outages reported from users. Users with new service

requirements will be directed to contact the Program Manager within the office of Commandant

(G-N).

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