The ADOP and PDOP: Two complementary diagnostics for GNSS positioning
The Ambiguity Dilution of Precision (ADOP) and the Position Dilution of Precision (PDOP) are two popular scalar-diagnostics used in Global Navigation Satellite System (GNSS) positioning. Where the ADOP is a predictor for carrier-phase ambiguity resolution performance, the PDOP is meant to predict th...
| Main Authors: | , , |
|---|---|
| Format: | Journal Article |
| Published: |
ASCE
2020
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/76754 |
| _version_ | 1848763751916896256 |
|---|---|
| author | Wang, Kan Teunissen, Peter El-Mowafy, Ahmed |
| author_facet | Wang, Kan Teunissen, Peter El-Mowafy, Ahmed |
| author_sort | Wang, Kan |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Ambiguity Dilution of Precision (ADOP) and the Position Dilution of Precision (PDOP) are two popular scalar-diagnostics used in Global Navigation Satellite System (GNSS) positioning. Where the ADOP is a predictor for carrier-phase ambiguity resolution performance, the PDOP is meant to predict the receiver-satellite geometry’s capability for precise positioning. We will show however, although the PDOP works well for code-based positioning, that one has to exercise great care in using the PDOP for real-time kinematic (RTK) positioning. We show that the ADOP and PDOP have distinct behaviors, an important consequence of which is that one can have time periods with small PDOPs, and thus seemingly good geometry for precise positioning, but at the same time large ADOPs, thus showing that successful ambiguity resolution and therefore precise positioning will not be possible. Also the reverse situation may occur, i.e. having large PDOPs with small ADOPs. In such a situation, the large PDOPs should not automatically lead to the conclusion of poor
position performance, since the large gain that ambiguity resolution brings will often still make precise positioning possible. We will analyse and explain this complementary behavior of the PDOP and ADOP, and demonstrate this both analytically and empirically. For this analysis we use real Global Positioning System (GPS) single- and multi-frequency signals and GPS/Quasi-Zenith Satellite System (QZSS), GPS/Navigation with Indian Constellation (NAVIC) L5 signals of two baselines located in Perth, Australia. |
| first_indexed | 2025-11-14T11:08:27Z |
| format | Journal Article |
| id | curtin-20.500.11937-76754 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:08:27Z |
| publishDate | 2020 |
| publisher | ASCE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-767542020-07-27T05:44:55Z The ADOP and PDOP: Two complementary diagnostics for GNSS positioning Wang, Kan Teunissen, Peter El-Mowafy, Ahmed 0909 - Geomatic Engineering Position Dilution of Precision (PDOP), Ambiguity Dilution of Precision (ADOP), Ambiguity Success-Rate (ASR), Integer Ambiguity Resolution (IAR), Real-Time Kinematic (RTK), Instantaneous Positioning. Yes The Ambiguity Dilution of Precision (ADOP) and the Position Dilution of Precision (PDOP) are two popular scalar-diagnostics used in Global Navigation Satellite System (GNSS) positioning. Where the ADOP is a predictor for carrier-phase ambiguity resolution performance, the PDOP is meant to predict the receiver-satellite geometry’s capability for precise positioning. We will show however, although the PDOP works well for code-based positioning, that one has to exercise great care in using the PDOP for real-time kinematic (RTK) positioning. We show that the ADOP and PDOP have distinct behaviors, an important consequence of which is that one can have time periods with small PDOPs, and thus seemingly good geometry for precise positioning, but at the same time large ADOPs, thus showing that successful ambiguity resolution and therefore precise positioning will not be possible. Also the reverse situation may occur, i.e. having large PDOPs with small ADOPs. In such a situation, the large PDOPs should not automatically lead to the conclusion of poor position performance, since the large gain that ambiguity resolution brings will often still make precise positioning possible. We will analyse and explain this complementary behavior of the PDOP and ADOP, and demonstrate this both analytically and empirically. For this analysis we use real Global Positioning System (GPS) single- and multi-frequency signals and GPS/Quasi-Zenith Satellite System (QZSS), GPS/Navigation with Indian Constellation (NAVIC) L5 signals of two baselines located in Perth, Australia. 2020 Journal Article http://hdl.handle.net/20.500.11937/76754 10.1061/(ASCE)SU.1943-5428.0000313 ASCE fulltext |
| spellingShingle | 0909 - Geomatic Engineering Position Dilution of Precision (PDOP), Ambiguity Dilution of Precision (ADOP), Ambiguity Success-Rate (ASR), Integer Ambiguity Resolution (IAR), Real-Time Kinematic (RTK), Instantaneous Positioning. Yes Wang, Kan Teunissen, Peter El-Mowafy, Ahmed The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title | The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title_full | The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title_fullStr | The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title_full_unstemmed | The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title_short | The ADOP and PDOP: Two complementary diagnostics for GNSS positioning |
| title_sort | adop and pdop: two complementary diagnostics for gnss positioning |
| topic | 0909 - Geomatic Engineering Position Dilution of Precision (PDOP), Ambiguity Dilution of Precision (ADOP), Ambiguity Success-Rate (ASR), Integer Ambiguity Resolution (IAR), Real-Time Kinematic (RTK), Instantaneous Positioning. Yes |
| url | http://hdl.handle.net/20.500.11937/76754 |