Changes between Version 4 and Version 5 of Processing/ipas_imu


Ignore:
Timestamp:
Dec 13, 2022, 1:49:07 PM (19 months ago)
Author:
wja
Comment:

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  • Processing/ipas_imu

    v4 v5  
    103103It should read the info from the file and allow you to execute the processing. At the start of the processing it should suggest that you interpolate the basestation data (which should have an interval of 30 seconds) to 1 second. Accept this, create the interpolated data and then run the processing.
    104104
    105 If, when you input the basestation `*.gpb` file, everything is greyed out and the informaton has not been read properly from the basestation, click on the `Advanced` tab and interpolate the  data
     105If, when you input the basestation `*.gpb` file, everything is greyed out and the information has not been read properly from the basestation, click on the `Advanced` tab and interpolate the  data
    106106
     107'''PPP Processing'''
    107108
     109You can undertake PPP processing in IPAS TC if you download the correct `*.sp3` and `*clk` data. Follow the instructions in the software to do PPP processing once you've input the basestation `*.gpb` data, you will then be prompted to download data within the software. In this window on the bottom right you can select already downloaded data, which is when you have to option to input the path to the `*.sp3` and `*clk`  files.
    108110
     111'''Lever Arms'''
    109112
     113The Owl was connected to the old IPAS20 (also referred to as 'Litton' previously). This IMU set up used to use a reference point for a sensor mount called 'PAV80' that we never had so is an arbitrary point below the plane.
    110114
     115We are not using 'PAV80' this year with the Owl, as this was (I belive) needed for the old Leica LiDAR system which isn't flown. Therefore we are using a reference point of 0, 0, 0 (i.e the plane's GNSS antennae) and then the lever arms from the IMU to there. The lever arms from the antennae to the Owl has been input into the APL config file.
    111116
     117In IPAC TC, for GNSS lever arm, input 0.001, 0, 0 (it doesn't let you process if they're all 0).
    112118
     119For the IMU lever arm, input 0.288, -0.638, 1.418
    113120
    114 
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    119 
    120 '''The following notes are just for reference. I don't think GrafNav works anymore'''
    121 
    122 '''GrafNav'''
    123 
    124 '''TODO: Lets try and move everything to IPAS TC'''
    125 
    126 Use grafnav to convert RINEX to *.gbp which is required by IPAS TC for the processing.
    127 
    128 For OS stations you need the extra ephemeris file. It's file extension needs renaming from `*.rnx` to `*.rxn`.
    129 
    130 Click on 'Convert Raw GPS data to GPB' (5th button from the left on the toolbar).
    131 
    132 Add directory containing daily RINEX file (no other files should be in here)
    133 
    134 In 'Global Options' add the path the 'External Ephemeris (NAV File).
    135 
    136 Hit 'Convert'
    137 
    138 '''PPP is not working - potentially needs updated post-2019 GPS week rollover, skip to IPAS TC section'''
    139 
    140 Load new `*.gpb` file in as remote.
    141 
    142 `Settings` > `PPP`, then in the `Precise` tab, add `*.sp3` and `*.clk` files.
    143 
    144 Run processing with `Process` > `PPP`
    145 
    146 On the `Precise` tab, add the `*.sp3` orbit file downloaded from CDDIS.
    147 
    148 Open new `*gpb` file as remote.
    149 
    150 
    151 
    152 Go to Settings > PPP. On the precise tab download precise clock and ephemeris '''Note it only recognises the time format of MM/DD/YYYY for the date range'''
     121This has been calculated finding the center point of the IPAS20 according to the 2022 survey.