The GDP Model 225WB Weather Format Synchronizer (WFS) is a stand-alone Frame Synchronizer/Decommutator designed to process data from the TIROS (Polar Orbiting) Weather Satellites. By applying a flexible programmable synchronization strategy, the unit synchronizes to the received data stream, detects a valid frame synchronizer pattern in the presence of bit errors and processes the contained information. Telemetry data is decommutated and extracted from the data stream and transmitted along with data quality information to other system elements by way of an Ethernet network connection. The unit is housed in a 5.25-inch chassis and can be controlled locally from the front panel keyboard and menu driven display, or remotely from a host computer on the network.

The unit includes a built in data stream simulator. The capability is also included to record the received telemetry and play it back at a later time.

Model 225WB Weather Format Synchronizer (WFS) supports the data formats of both the ATN and the KLM spacecraft. These formats include HRPT (High Resolution Picture Transmission), LAC (Local Area Coverage), GAC (Global Area Coverage), AIP (AMSU Information Processor), SAIP (Stored AIP), TIP (TIROS Information Processor), TIP Boost (TIROS Information Processor-Boost), and STIP (Stored TIP) data formats. Aboard the spacecraft the TIP, HRPT, and/or the AIP data is transmitted in real-time, while the LAC, GAC, SAIP, and/or STIP data are played back from digital tape recorders in reverse direction. Model 225WB accepts all formats and synchronize to them in both the forward and the reverse direction performing polarity resolution (APC – Automatic Polarity Control) to correct for inverted data. Specific synchronization strategies can be programmed into the unit.

A data stream is processed based on the selected format. Each of the supported formats relates to a predefined process that includes definitions for routing of data and the determination of data quality.

The data input may also be by means of a packetized reception on an Ethernet connection.