Bad Elf Flex: GNSS & RTK Feature

Bad Elf Flex: GNSS & RTK Feature

Primary GNSS Status Page


Field descriptions

  • Horizontal - the reported statistical accuracy reported by the GNSS

  • Elevation - the reported GNSS elevation as configured by the Bad Elf Flex app. This includes the specific geoid model currently in use. 

  • Fix - the type of GNSS fix:

    • FIX - RTK or L-Band Fixed solution

    • FLT - RTK or L-Band Float solution

    • DIF - Differential corrected solution

    • AUT - Autonomous solution

    • NO - No solution

  • Correction - the source of corrections:

    • SBAS

    • RTCM3

    • L-Band

  • Bubble level - the orientation of the Flex with respect to vertical

You can configure the units used for each of these fields by using either the Flex UI or the
Bad Elf Flex app.

Detailed GNSS Status Page


  1. Horizontal - the statistical horizontal accuracy reported by the GNSS
  2. Vertical - the statistical vertical accuracy reported by the GNSS
  3. Elevation - the reported GNSS elevation as configured by the Bad Elf Flex app
  4. PDOP - positional dilution of precision
  5. HDOP - horizontal dilution of precision
  6. VDOP - vertical dilution of precision
  7. Latitude - the current latitude north or south
  8. Longitude - the current longitude east or west

You can configure latitude and longitude to appear in decimal degrees, degrees with decimal
minutes, or degrees and minutes with seconds


GNSS Corrections Page



  • Fix - the type of GNSS fix:

    • FIX - RTK or L-Band Fixed solution

    • FLT - RTK or L-Band Float solution

    • DIF - Differential corrected solution

    • AUT - Autonomous solution

    • NO - No solution

  • ACC - the RTK accuracy status (This is a hex encoded field used for diagnostics.)

  • Corrections in use -  the source of corrections:

    • SBAS

    • RTCM3

    • L-Band

  • Age - the age in seconds of the corrections source

  • Distance - the distance between the Flex and the corrections source

  • Horizontal Estimate - an estimate of the horizontal accuracy based on the corrections source

  • Inbound Corrections - information about the source producing corrections for the GNSS or No Source


RTK Status Page



This page displays text information pertaining to the quality of an RTK fix. Any issues
limiting the quality of the fix appear here.


L-Band Status Page



  • Fix - the type of GNSS fix:

    • FIX - RTK or L-Band Fixed solution

    • FLT - RTK or L-Band Float solution

    • DIF - Differential corrected solution

    • AUT - Autonomous solution

    • NO - No solution

  • Corrections in use -  the source of corrections:

    • SBAS

    • RTCM3

    • L-Band

  • Age - the age in seconds of the corrections source

  • Freq - the frequency used for corrections. In SBAS mode this reports SBAS L1. In L-Band mode this reports the satellite frequency received.

  • AGC, DSP, BER, NAVCON - diagnostic fields for use by Bad Elf primarily related to L-Band reception


Orthometric Height Page



This page displays a complete picture of how orthometric height is calculated. You can configure
geoids, antenna offsets, and final heights by using the Bad Elf Flex app.


  • Model in use - the geoid model used to calculate orthometric height, (Sats) indicates that the solution is autonomous, (RTK) indicates that the solution is using a geoid model based on the corrections source

  • Ellipsoidal height - the GNSS ellipsoidal height as reported by the Flex with no offset

  • Antenna - the antenna height offset including any pole height adjustments as defined in the Bad Elf Flex app

  • Geoid - the geoidial offset calculated using the current GNSS position and geoid model

Final Orthometric Height - the orthometric height (H) calculated using the geoid model (N), ellipsoidal
height (h), and antenna offset (A) using the formula:

H = h - A - N


Satellite Page


This page displays a sky portrait of the approximate location and orientation of visible satellites used in
the solution. Orientation is north-up. The outer ring represents the horizon, and the inner ring represents
45 degrees off the horizon.


The line at the bottom shows how many satellites are part of the solution and how many are visible.


Logging Popup



Actions

  • Press the enter button on any of the pages to bring up a popup containing logging options. 

  • You can scroll through the list of logging options using the  up and down arrow buttons

    • Press the enter button on an option to activate that logging feature

    • Press the back button to dismiss the logging popup


No Fix Indication


When the Bad Elf Flex cannot compute a GNSS solution, relevant display pages will revert to the message:


No GNSS Fix

Primary reasons for this message include:

  • The Flex has recently powered up and has not yet acquired a position.

  • The Flex has changed location significantly, or has been off for some time, and needs to receive information from the satellites to derive its new location.

  • The Flex has poor orientation or has a limited view of the sky.


For further assistance, please contact our support team via support@bad-elf.com.

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