How to use Accumulated Delta Range?

[Shuo Tang]

Hi guys,

I am a new member here, nice to meet you!

How can we use accumulated delta range instead of carrier phase? The API explains ADR as another form of carrier phase measurement, but I find in the Rinex file, the carrier phase measurement usually has a big value and is close to 'code measurement/wavelength'. The ADR has a positive/negative small value with the same trend with code measurement. How can we utilize that on earth?

[ndo...@gmail.com]

Would recommend grabbing this book, and starting with section 
12.3.1.2. https://1lib.us/book/3589994/edeca2

Then search the rest of the book for "phase measure". I believe ADR in the Android code is just "code minus carrier". That is pseudorange minus carrier phase. 

[Sean Barbeau]

Good question!

I've never actually done this computation myself, but I believe the ADR value is just an offset for the computed pseudorange value?

Take a look at the source code that the Google GNSS measurement tool uses to process ADR:
https://github.com/google/gps-measurement-tools/blob/063e2275e29de1f5476f2a9a9e0cb900a37d0b68/opensource/ProcessAdr.m

Here's the Android ADR API definition:
https://developer.android.com/reference/android/location/GnssMeasurement#getAccumulatedDeltaRangeMeters()

The EU GSA raw measurements document really doesn't go into ADR in detail:
https://www.euspa.europa.eu/system/files/reports/gnss_raw_measurement_web_0.pdf

I'd certainly welcome input from anyone who has computed carrier phase measurements from ADR themselves.

Sean

[ndo...@gmail.com]

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=2899&context=rtd

https://insidegnss.com/accuracy-for-the-masses/

[samin nasr]

Hi friends, Hope you be well.

I've got the same problem about Smartphones rinex file, which include positive and negative small value and big positive value. Would you please tell me and make me sure if these measurements(positive and negative small value) are ADR?

[samin nasr]

Hi friends, Hope you be well.

I've got the same problem about Smartphones rinex file, which include positive and negative small value and big positive value. Would you please tell me and make me sure if these measurements(positive and negative small value) are ADR?

On Thursday, August 26, 2021 at 3:28:11 AM UTC+4:30 ndo...@gmail.com wrote: