Project to Develop GOES DCS User Requirements

TWG PresentationBy

Ernest DreyerOctober 28, 2009

Motivation

Assess capability of GOES DCS to meet current and projected user requirements.

Prepare short-term and long-term scenarios for meeting those requirements.

Approach

Characterize the current system Document user requirements

Web questionnaire Interviews where possible

Develop short-term and long-term scenarios for satisfying user requirements

Characterize the Current System

Provide an up-to-date description of the entire system

STIWG Operational Plan will be used as a starting point.

Included will be Update of system capabilities

Improvements at Wallops Role of EDDN and other backups Data Distribution Inventory of DRGSs and LRGSs

Future Developments Narrow-band Conversion Binary Transmission DCP Command

Growth of GOES DCS

Users of GOES DCS

2000 2009

Document User Requirements

Most users are adapting the current capabilities of the system to their needs

Need to find out the “real” requirements for future planning – especially for determining needed capacity. This will possibly affect

additional satellite capabilities and modes of operation

Examples Capacity Requirements for next 10 years

How many sites? Types of sites?

Mode of Operation How many critical sites need data

transmitted more frequently than 1 hour? Can sites by categorized by transmission

frequency? If so, perhaps the system should be organized around transmission frequency.

How would two-way communications affect the mode of operation

Develop scenarios for satisfying user requirements

Evaluate requirements and develop scenarios for meeting them, e. g. capacity can be increased in the

short term Implementing binary format

intermediate term Implementing narrow-band scheme Changing mode of operation

long term Adding additional transponder to satellite

Actual and Projected Growth( Projection is based on growth in last 10 years.)

Observations

To accommodate 50,000 300-baud sites that transmit every hour in 10-second windows would require 140 channels.

The current layout is Self-timed channels

100/300 Baud 172 1200 Baud 10

Observations (cont.)

Reducing the band width of each channel by ½ will double the capacity.

If the projected growth turns out to follow the past 10 years, there should be additional capacity to try other modes of operation. Channels for 15 minute transmissions Channels for daily transmissions Channels for use by DCP Command

Gather information Try to contact as many players as possible

either directly, by phone, or my email. This will include

STIWG members for requirements Manufacturers for inventory and other input Others

Develop Web-based questionnaire for all other GOES DCS users

Next Steps

Produce Reports Will try to publish intermediate results on a

Web site. Expect to finish in late Spring.

Contact Me Welcome input at any time. sedreyer@verizon.net

Next Steps(cont.)

Start thinking about Expansion of data collection network over

next 10 years. Numbers per year

Types of sites and data collection requirements to include

Importance of sites/type Estimate of number of sensors/type Desired mode of operation/type

Requirements for continuity of operations (COO).

Homework