National Weather Service United States Department of Commerce

Ian Battering the Florida Peninsula with Catastrophic Storm Surge, Winds, and Flooding

Ian made landfall on mainland Florida as a category 4 major hurricane near 4:30 PM ET south of Punta Gorda near Pirate Harbor. Catastrophic storm surge inundation along with destructive waves is ongoing along the southwest Florida coastline. Hurricane-force winds are expected to spread inland to central Florida near the core of Ian through early Thursday. Heavy rainfall will continue flooding. Read More >


Sources for HRIT/EMWIN systems and components:


US Government auction of L-band frequency spectrum (1695 to 1710 MHz) adjacent to GOES-R HRIT/EMWIN transponder frequency is likely to adversely impact the reliability of HRIT/EMWIN signal reception in the US due to cell phone interference.

 

HRIT/EMWIN Downlink Characteristics (NESDIS-2)


Coding – BPSK

  • Convolutional rate ½ code with constraint length 7 concatenated with Reed Solomon (255,223) with Interleave = 4
  • Square Root Raised Cosine filtering using an Alpha factor of 0.3
  • The resulting “Necessary Bandwidth” for this signal will be 1.205 MHz

Modem Required: predicted C/No is in the range of 63-67 dB
Maximum Demodulator Required is -

  • Eb/No is 4.6 dB for a BER of 1x10-8 after decoding

Minimum Antenna System

  • At 5 degree elevation, the minimum antenna is 1.2 meter.
  • At 10 degrees or more elevation the minimum size is 1.0 meter
  • Using a LNA or LNB with a system noise temperature of about 200 K will provide a G/T of 1.0 dB/K or -0.3 dB/K respectively