GOES-T 18 Preparing for a new satellite

UPDATED 05-11-2022

March 1, 2022 LAUNCH

GOES 18, was successfully launched on March 1st, 2022. I will be documenting the modifications to the software that are being made to prepare for the new GOES 18 (and GOES-19) satellites on these pages.

See my blogposts for some video and pictures of GOES-T On the Road to Launch GOES-T: Road to Launch

GOES-T being Loaded onto a C-5 Super Galaxy Nov 9, 2021

What you need to do to receive GOES 18 when it arrives on-orbit at 137.2W

GOES-T/18 Transition to Operations – Post Launch Test (PLT) Schedule and Plans.

The following plan is based on the successful launch and checkout of the GOES-T/18 Satellite. It incorporates an early drift of GOES-18 to the West orbital slot and allows for early operational use of GOES-18 ABI to supplement GOES-17 ABI imagery.

Key Dates:
Launch: March 1, 2022
Post-Launch Checkout Part 1 at 89.5 W: Starts March 24, 2022
Drift to 136.8 W: May 16 – June 6, 2022
Post-Launch Checkout Part 2 at 136.8 W: Starts June 7, 2022
Interleaving GOES-18 ABI through GOES-17 GRB: August 1 – September 6, 2022
Instrument and product tests: September 6 – December 12, 2022
GOES-West Operations Declaration January 3, 2023

Key Dates:

LaunchMarch 1, 2022
Reach Geo Stationary OrbitMarch 14,2022
Second stage solar array deploymentMarch 14,2022
Drift to 89.5°WMarch 15=March 23, 2022
Post-Launch-Test/Checkout (PLT) Part 1March 24 – May 15, 2022
Drift to 136.8 WMay 16 – June 6, 2022
Post-Launch-Test/Checkout (PLT) and PLPT Part 2June 7 – January 3, 2023
1st Interleaving GOES-18 ABI through GOES-17 GRBAugust 1 – September 6, 2022
GOES-17 (GOES-West) Operations and GOES-18 Product Maturation Continues: GOES-18 Supplemental data for NWS via CloudSeptember 6 – October 15, 2022
2nd Interleaving GOES-18 ABI through GOES-17 GRBOctober 15 – November 11, 2022
GOES-17 (GOES-West) Operations and GOES-18 Product Maturation Continues: GOES-18 Supplemental data for NWS via CloudNovember 11, 2022 – January 3, 2023
GOES-West Operations Declaration January 3, 2023

This is a lot to ingest, below is the summary:

  • Transition plan swaps GOES-17 with GOES-18 as the operational GOES-West satellite Assumes successful launch and checkout of GOES-T/18
  • Incorporates early drift of GOES-18 to the West operational longitude
  • Allows for early operational use of GOES-18 ABI after Beta maturity is achieved
  • The transition plan incorporates RF conflict mitigation between GOES-17/18 X-band and T&C uplinks/downlinks
  • Users do not need to re-point antennas
  • GOES-18 will be drifted to 136.8W to complete instrument PLT activities
  • 0.4 deg offset from GOES-17 allows X-band RDL downlink from both G17/G18
  • 0.2 deg offset from 137.0W meets ground product generation requirements
  • Both GOES-17 and GOES-18 images will be re-mapped to 137.0W
  • GOES-18 ABI data available to support the August GOES-17 ABI warm period
  • GOES-18 ABI data available via Cloud interface and interleaving with GOES-17 non-ABI product data
  • After the operational transition, GOES-18 is nudged over to 137.2W
  • GOES-17 drifted to 105W and placed in on-orbit storage.

GOES 18 will be transmitted in the same frequency as 16 and 17, BUT, while it is in outgassing and instrument testing at 89.5° It will only be using DCN (Data Collection Network) DSN and NASA GN used during launch and orbit raising, Those frequencies are –
DSN Telemetry
2211.041
RHCP
2211.04
NRZ-L/BPSK/PM
1024 kHz sub-carrier
32 kbps CCSDS, on-orbit mode
4 kbps CCSDS, safe hold mode

DSN Command

RHCP
2036.0
NRZ-L/BPSK/PM
16 kHz sub-carrier
1 kbps CCSDS CLTU, safe hold mode
4 kbps CCSDS CLTU, on-orbit mode

DSN Ranging
2211.041
RHCP
2036.0
Tone Ranging
221/240 Phase coherent frequency ratio

After the transition of GOES -18 to On-Orbit Position of 137.2°W It will take over all the functions of the West Satellite. This is planned to be in January 0f 2024 GOES 17 will be drifted to 105°W and be placed in on-orbit storage.


Changes Necessary for GOESTOOLS

Creating new GOESPROC.CONF file

Pieter (author of GOESTOOLS) is making the necessary changes to goestools to be able to receive and process GOES 18 and 19, I am currently running the new build and have tested it with sample raw data and it appears to be working.

I have installation and update procedures on this page: https://usradioguy.com/programming-a-pi-for-goestools/

No realignment or frequency changes are needed once it reaches 137.2°W

Until GOES 18 takes over for GOES 17, all interleaved imagery will be sent by GOES 17 from a ‘virtual perspective’ of 137° W (combing the images from G17 at 137.2° and G18 at 136.8°) This will cause some issues with map overlays, unless you go in and edit it to be correct.

Modified GOESPROC.CONF for GOES 18

Note that this section must be added for GOES 18 HRIT reception.

Add this section to your goesproc-goesr.conf file directly after the GOES 17 section using the nano editor: If you are using the standard gradients and false-color LUTs, then you will need to change those as well.

sudo nano /usr/share/goestools/goesproc-goesr.conf

# Added Ability to Decode GOES-18 Products
#
# Store all original GOES-18 products.
[[handler]]
type = "image"
origin = "goes18"
directory = "./goes18/{region:short|lower}/{channel:short|lower}/{time:%Y-%m-%d}"
filename = "GOES18_{region:short}_{channel:short}_{time:%Y%m%dT%H%M%SZ}"
format = "jpg"
json = false

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_0_countries_lakes.json"

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_1_states_provinces_lakes.json"

# GOES-18 ABI false color USRADIOGUY CUSTOMLUT NO MAP and jpg.
[[handler]]
type = "image"
origin = "goes18"
regions = [ "fd" ]
channels = [ "ch02", "ch13" ]
directory = "./goes18/{region:short|lower}/CUSTOMLUT/{time:%Y-%m-%d}"
filename = "GOES18_{region:short}_FC_CUSTOMLUT_{time:%Y%m%dT%H%M%SZ}"
format = "jpg"
json = false

  [handler.remap.ch02]
  path = "/home/pi/goes/usradioguy_goes16_ch02_curve.png"

  [handler.lut]
  path = "/home/pi/goes/usradioguycustomlut.png"


# GOES-18 ABI false color.
[[handler]]
type = "image"
origin = "goes18"
regions = [ "fd", "m1", "m2" ]
channels = [ "ch02", "ch13" ]
directory = "./goes18/{region:short|lower}/fc/{time:%Y-%m-%d}"
filename = "GOES18_{region:short}_FC_{time:%Y%m%dT%H%M%SZ}"
format = "jpg"
json = false

  [handler.remap.ch02]
  path = "/usr/share/goestools/wxstar/wxstar_goes16_ch02_curve.png"

  [handler.lut]
  path = "/usr/share/goestools/wxstar/wxstar_goes16_lut.png"

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_0_countries_lakes.json"

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_1_states_provinces_lakes.json"

# GOES-18 ABI RGB-enhanced
[[handler]]
type = "image"
origin = "goes18"
regions = [ "fd", "m1", "m2" ]
channels = [ "ch07", "ch08", "ch09", "ch13", "ch14", "ch15" ]
directory = "./goes18/{region:short|lower}/{channel:short|lower}_enhanced/{time:%Y-%m-%d}"
filename = "GOES18_{region:short}_{channel:short}_enhanced_{time:%Y%m%dT%H%M%SZ}"
format = "jpg"
json = false

  ## The following gradients are rough approximations of the 
  ## McIDAS RGB enhancements used by NOAA/NESDIS/STAR on their site..
  ##
  ## For more info:
  ##
  ##   https://www.star.nesdis.noaa.gov/GOES/GOES16_FullDisk.php 
  ##   http://cimss.ssec.wisc.edu/goes/visit/water_vapor_enhancement.html
  ##   http://cimss.ssec.wisc.edu/goes/visit/enhanced_v_enhancements.html

  ## Shortwave IR (Channel 7)
  [handler.gradient.ch07]
  points = [
    { units = 400, color = "#000000" },
    { units = 250, color = "#b9b9b9" },
    { units = 249.999, color = "#00ffff" },
    { units = 240, color = "#000080" },
    { units = 230, color = "#00ff00" },
    { units = 220, color = "#ffff00" },
    { units = 210, color = "#ff0000" },
    { units = 200, color = "#000000" },
    { units = 190, color = "#ffffff" }
  ]

  ## Water Vapor (Channels 8 and 9)
  [handler.gradient.ch08]
  points = [
    { units = 276, color = "#000000" },
    { units = 275.9, color = "#ff0000" },
    { units = 258, color = "#ffff00" },
    { units = 250, color = "#000070" },
    { units = 233, color = "#ffffff" },
    { units = 195, color = "#408020" },
    { units = 178, color = "#00ffff" }
  ]
  [handler.gradient.ch09]
  points = [
    { units = 276, color = "#000000" },
    { units = 275.9, color = "#ff0000" },
    { units = 258, color = "#ffff00" },
    { units = 250, color = "#000070" },
    { units = 233, color = "#ffffff" },
    { units = 195, color = "#408020" },
    { units = 178, color = "#00ffff" }
  ]

  ## Longwave IR (Channels 13, 14, and 15)
  [handler.gradient.ch13]
  points = [
    { units = 333, color = "#000000" },
    { units = 238, color = "#b9b9b9" },
    { units = 237.999, color = "#00ffff" },
    { units = 228, color = "#000080" },
    { units = 218, color = "#00ff00" },
    { units = 208, color = "#ffff00" },
    { units = 198, color = "#ff0000" },
    { units = 188, color = "#000000" },
    { units = 178, color = "#ffffff" }
  ]
  [handler.gradient.ch14]
  points = [
    { units = 333, color = "#000000" },
    { units = 238, color = "#b9b9b9" },
    { units = 237.999, color = "#00ffff" },
    { units = 228, color = "#000080" },
    { units = 218, color = "#00ff00" },
    { units = 208, color = "#ffff00" },
    { units = 198, color = "#ff0000" },
    { units = 188, color = "#000000" },
    { units = 178, color = "#ffffff" }
  ]
  [handler.gradient.ch15]
  points = [
    { units = 333, color = "#000000" },
    { units = 238, color = "#b9b9b9" },
    { units = 237.999, color = "#00ffff" },
    { units = 228, color = "#000080" },
    { units = 218, color = "#00ff00" },
    { units = 208, color = "#ffff00" },
    { units = 198, color = "#ff0000" },
    { units = 188, color = "#000000" },
    { units = 178, color = "#ffffff" }
  ]

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_0_countries_lakes.json"

  [[handler.map]]
  path = "/usr/share/goestools/ne/ne_50m_admin_1_states_provinces_lakes.json"