These release notes contain information on system and disk space requirements for installing and running ODTK; information on new capabilities and features introduced in the current version of ODTK, including issues resolved from the prior version; transition information -- cautions, workarounds and operational tips -- to help maximize your successful use of the product; and a brief introduction to online help resources.
ODTK 6.3.2 features
ODTK 6.3.2 is a maintenance release containing a few new features and various bug fixes. Note that this is our first release where we no longer support Windows XP.
Deep Space OD improvements
Added support for processing DSN Delta DOR (Delta Differenced One-way Range) tracking data. These measurements are typically available from the NASA Deep Space Network.
Added support for using the JPL DSN media corrections for the troposphere and ionosphere.
The DSN tracking data reader now has the capability to compress the Total Count Phase (TCP) measurements based on a user specified sub sample rate.
Other measurement model improvements
Added ionosphere refraction corrections to the elevation angle measurement model.
Added the ability to generate relative optical observations from individual optical observations and utilize them when doing simultaneous OD on multiple satellites.
Usability
Added support for importing STK targets and place objects into an ODTK scenario. This is similar to our existing support for importing STK facilities.
Reporting and Graphing
We added several new graph styles (of existing data) that we have found useful in our processing.
- Atmospheric Density Consistency
- Facility Location Cartesian
- Facility Location LLA
- Residuals by Azimuth Angle
- Residuals by Elevation Angle
- Residuals by Range
- Residuals by Time of Day
- Retroreflector Delay
Capabilities added and issues resolved from the prior release
| New Capabilities and Resolved Issues in ODTK 6.3.2 | |
|---|---|
| Tracking No. | Description |
| 32217 | The capability has been added to read and process DSN Delta DOR tracking data. |
| 55944 | JPL DSN media corrections can now be used for troposphere and ionosphere. |
| 62363 | The DSN tracking data reader now has an editable option to compress the TCP subsample rate from the Edit | Preferences... | Plugins tab. When the TCPCompression flag is set to true, the TCP data will be sub-sampled and processed at the TCPSubSampleRate. A new utility DSN_TCP_SubSample_Rate has also been added which will change both the DSN reader configuration and facilities CountIntervals to the desired setting. |
| 78113 | The elevation angle measurement model now supports ionosphere corrections (if enabled). The size of the correction is dependent on the frequency of the received signal and is most noticeable at frequencies below (1 GHz). |
| 78125 | ODTK no longer abnormally terminates when generating a report for Atmospheric Density without having a scenario loaded. ODTK will now display an error message. |
| 78399 | New observation types were added to ground-based and space-based optical trackers. A new functional attribute in the application class allows for the generation of the delta obs into the .gobs format based on the tracking data files currently assigned to the scenario. Delta obs are generated when simultaneous observations from a tracker to multiple target objects are detected. The syntax of the new functional attribute is:
ODTK.GenerateDeltaRADec OutputFilePath, timeTagTolerance where OutputFilePath specifies the output.gobs file location and timeTagTolerance specifies a value, in seconds, representing the maximum amount of time between observation time tags to allow them to be considered simultaneous. |
| 78479 | The process noise model associated with local atmosphere density corrections has been modified to avoid the condition where the root variance of the relative atmospheric density can become extremely small at high altitudes (> 1000 Km). When such a condition occurs, the filter state error covariance can become ill-conditioned due to an erroneously large condition number. |
| 78729 | ODTK can now import STK Target (*.t) and Place (*.pic) object files. |
| 78730 | You can now load Target and Place objects into the GenSimSchedule30.htm utility. |
| 78861 |
The SP3 to Simrun conversion utility has been updated to correct a unit conversion error, which affected the resulting value of the GPS clock frequency estimates. The State File to SP3 File tool has been updated to correctly detect the reference frame of the input orbit data to ensure accurate transformation to the Earth-Fixed frame for SP3 output. |
| 78957 | The scenario default date is now 1 Jul 2014. |
| 78895 | To support re-entry and the construction of VCM messages, estimated force model parameter correlations to pos/vel were added to the LastSatellite table. |
| 78907 | A problem was fixed where a facility could estimate a time tag bias or a troposphere bias, but not both at the same time. A similar problem was fixed on satellite objects where the time bias could not be estimated while the satellite was using a reference ephemeris (e.g., not solving for the satellite orbit, too). |
| 78961 | ODTK is not supported on Windows XP. |
| 79168 | Two Quasar database files that support Delta DOR processing are added to ODTK. |
| 79170 | The following new graph styles are now available: Atmosphere Density Consistency, Facility Location Cartesian, Facility Location LLA, Residuals by Azimuth Angle, Residuals by Elevation Angle, Residuals by Range, Residuals by Time of Day, and Retroreflector Delay. |
| 79291 | The RINEX observation data reader was updated to properly handle a RINEX record that only contains observations that ODTK does not process. Previously, it would not return any measurements and would not continue to look through the file for records that contained valid data. |
| 79386 | The numerical quadrature implementation which is used to integrate the effect of the ionosphere on range measurements has been improved to reduce the frequency of spurious results. |