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AUSPOS—Online GPS Processing Service

This guide explains how to get the precise coordinates of a standalone receiver using the Australian online GPS processing service AUSPOS.

Overview

AUSPOS is an online GPS processing service provided by Geoscience Australia. With AUSPOS, you may accurately determine the coordinates of a static point worldwide without real-time corrections or a base station nearby.

tip

You can learn more about the AUSPOS service on their official site.

How AUSPOS works

A standalone receiver finds its position by relying on the raw data obtained from satellites only. In this case, it can determine its position at the several-meter level. To improve the accuracy, the receiver can be used with a base station in the RTK setup. Since both receivers work in the same conditions, the base station sends corrections that eliminate ionospheric and tropospheric delays, clock errors of the receiver and satellites and improve accuracy.

With AUSPOS, you can achieve a centimeter-level accurate position of a point with one receiver. When you upload your observation file, AUSPOS chooses up to 15 nearest International GPS Service (IGS) and Asia-Pacific Reference Frame (APREF) stations for processing.

These stations form a local network that provides the data required to eliminate ionospheric and tropospheric delay errors. With the help of the data from these stations, the service calculates the approximate coordinates of the receiver.

The last stage of the processing is computing a solution. AUSPOS eliminates clock errors of the receiver and the satellites to obtain precise coordinates of the point.

note

AUSPOS uses dual-frequency GPS data for solution computation and supports only Static Positioning mode.

Depending on the accuracy level and time that is required to get the solution, the AUSPOS service can calculate the data in the following modes:

Orbit typeWhen the orbit is ready for useAccuracy
ULTRA-RAPID3–9 hours after the end of the survey~15 cm
RAPID17–41 hours after the end of the survey~5 cm
FINAL12–8 days after the end of the week after the survey~2 cm

Workflow

Placing the base

Place your Reach precisely above the marked point on the tripod and level it. You can learn more about placing Reach in this tutorial.

Recording RINEX logs on Reach

To record logs for AUSPOS, perform the following steps:

  1. Open ReachView 3 and connect to your Reach.

  2. Go to the Logging screen.

  3. Tap Settings in the Raw data section.

  4. Select the AUSPOS preset.

  5. Choose the RINEX format from the Format dropdown menu.

    note

    If you do not know which version of RINEX you need, we recommend using RINEX 3.03.

    tip

    While recording in the RINEX format, you can log the UBX file as a backup. UBX file can be used to adjust RINEX file settings in the Converter tool in Emlid Studio. You can enable logging in the UBX format in the logging settings in ReachView 3.

  6. Turn on the Use antenna height option and enter the measured height to the bottom of the receiver in the corresponding field.

  7. Fill in the point's name in the Marker name field.

  8. Tap Apply.

    tip

    You can start recording automatically when your receiver is turned on. Check the corresponding field on the Raw data settings screen.

  9. Enable log recording by tapping Start recording in the Raw data section.

    note

    AUSPOS requires recording the data for at least 4 hours to get the best accuracy.

  10. Stop log recording by tapping the End recording button.

    caution

    Wait for data processing to finish.

tip

You may log the data for up to 24 hours, depending on the accuracy required.

Once you finish the survey, don't forget to turn off raw data recording in the logging settings.

Downloading logs

After you finish raw data logging, you need to download RINEX data from Reach to your mobile device.

  1. Go to the Logs section at the bottom of the Logging screen.

    note

    You can also find information on the logs size and recording date and time here.

  2. To export the file, tap the Download button.

  3. Save your log depending on the device you use.

    tip

    If you do not need your logs anymore, you can delete them using the Edit button.

Submitting data to AUSPOS service

Once the logs are downloaded, export them to your PC in a preferred way and submit the data to AUSPOS for processing.

  1. Go to AUSPOS submission page.

  2. In the Load RINEX Files field, click the Choose File(s) button and browse for the observation file (.**O). You can upload up to 20 files at once.

    caution

    The observation file name should not contain any special characters, symbols, or spaces. Otherwise, the file will be rejected.

  3. Enter the pole height in the Height (m) field.

  4. Choose EML_REACH_RS2 NONE in the Antenna Type field.

    tip

    For Reach RS2+, choose EML_REACH_RS2+ NONE.

  5. In the Email Address field, enter your email address to get the results.

  6. Click Submit.

AUSPOS will assign the job number to your submission and send the file with the solution to your email address.

Assessing AUSPOS results

In the solution report, you will get the following information:

  • Computed coordinates in 3 different formats:

    • Cartesian (XYZ)

    • Geodetic (LLH)

    • UTM Grid

  • Positional uncertainty showing the estimated accuracy of the computed coordinates

Additionally, you can check the ambiguity resolution for every reference station used in the computation.

tip

After you get the solution report, it might be useful to check how accurate the results are. The most accurate AUSPOS solutions have no warning messages in the report.

Setting up obtained base coordinates in ReachView 3

If you want to use the obtained coordinates as a base position, you can enter the base coordinates in ReachView 3.

  1. Open ReachView 3 and connect to the Reach you want to use as a base.

  2. On the Receivers screen, tap Base settings.

  3. Tap the Configure button.

  4. Set the Coordinates entry method to Manual.

  5. Specify the antenna height and enter the coordinates.

  6. Tap Save.

After setting up the base position, you can continue working in RTK or PPK.

Further reading