Static Positioning

Case Study: Epoch-by-Epoch™ Precise Positioning for Orange County Real Time Network (OCRTN)

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The system utilizes a PDA that plugs into a roving GPS receiver and controls the wireless communications link to an RTCM server.

The advantages of Epoch-by-Epoch™ over conventional RTK are:

• No initialization or re-initialization delays to contend with.
• Positioning can be performed over extended ranges (several 10's of km) with dual-frequency GPS receivers.
• Positioning can be performed over short distances (several km's) with L1 (code and phase) GPS receivers, makeing it ideal for low-cost local solutions.

Geodetics RTD software controls the real-time flow of data from a network of continuous GPS sites in Orange County, and serves RTCM data via TCP/IP.

The Geodetics PDA software accepts data from the three closest sites, unlike typical RTK systems that can only position themselves with respect to a single reference site.

Courtesy of John Canas and Art Andrew, Geomatics/Land Information Systems, Orange County Public Facilities and Resources Department