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Updated NCOM decoders

01 October 2010

We have released a new and improved version of the C code drivers, which can be used to decode the NCOM output of the RT and Inertial+ products. There are no specific changes to the main measurements from NCOM but there are improvements to some of the status messages. The drivers are updated to include the latest features of the RT and Inertial+ firmware.

This version of the C code drivers is in regular use at OxTS. Most of our software uses a C++ implementation of the drivers but we are using these C drivers in our software test platform. This is a step change from earlier versions which were created specifically for customers and were not regularly tested.

Most of the changes to the drivers are small corrections or changes to make the drivers more compatible across a wide variety of compilers and platforms. The standard integer definitions have been updated and code that generates specific warnings on some compilers has been changed.

The drivers are now aware of the latest GPS receivers for the Inertial+: Topcon’s GB-500 and NavCom’s Sapphire. The accelerometer scale factors can be decoded from versions of the blended navigation system that support these as Kalman filter states. The fields that list what features are available in the hardware are present, though these may not be correctly configured in older RT products.

The drivers have the same programming interface as the previous version and they can be compiled in with little or no changes to other software. The latest version of the drivers is available for download on the documentation page, here... For more information on the C code NCOM drivers please contact support.

Full list of changes:

1354
Added IMU and GPS type enumerations.
1355
Improved OmniStar serial number decoding.
1356
Fix (possible) bug in decoder extra 66, 67 regarding casting.
1367
Added decode extra 57: Position estimate of the primary GPS antenna (extended range).
Note that in some recent firmwares channel 57 is used in place of the older estimates of channel 12.
Thus by not having decode extra 57 the decoder would not decode the position estimates for later NCom files.
1368
Introduce a pointer mCurStatus into mCurPkt to make decoding easier.
1369
Guard against uncertainty with PRId8 and PRIu8 in MSVC.
1370
Use some enumerated indexes for access into mCurPkt.
1382
Add Accelerometer Scale Factor to decoders.
1388
Move distance computation into own function.
1391
Now computes 2d and 3d for both speed and distance.
1404
Rename OmniStatusVBS* to OmniStatusVbs* and OmniStatusHP* to OmniStatusHp*.
1421
Rename WSTime to WSpeedTime so that these are more consistently named.
1422
Fix minor bug where WSpeedTime was not being invalidated if the incoming data is invalid or timing is invalid.
1720
Change file encoding from ISO-8859 to ASCII by replacing superscript 2 with ^2 in some comments.
2323
Added new output modes (MGCOM1, Javad I+RTK) to array ComOptionOutput[].
2324
Added GPS types (Topcon GB-500 and NavCom Sapphire) to array GpsTypeName[].
2752
Rename: InnWSpeedF to InnWSpeed, OptionWS* to OptionWSpeed*.
2753
Update standard integer definitions.
2756
Minor tidy of some hash defines.
2758
Set mIsUmacStatusValid = 0 on bad Umac.
2761
For decode extra 0, Set valid flag invalid when GpsNumObs, GpsPosMode, GpsVelMode, GpsAttMode raw data are invalid.
2762
For decode extra 13 (Orientation estimate of dual antenna systems) improve logic for detecting invalids.
2763
For decode extra 15 (Accuracy of the orientation of dual antenna systems) improve logic for detecting invalids.
2764
For decode extra 16 (RT to vehicle rotation) improve logic for setting invalid UTC Offset.
2765
For decode extra 20 (Differential corrections configuration) improve logic for setting invalid BaseStationId, fix bug in setting BaseStationId.
2768
For decode extra 30 (Operating system and script version information) improve logic for setting invalids.
2772
For decode extra 31 (Hardware configuration information) improve logic for setting invalids.
2773
For decode extra 37 (Heading misalignment angle and accuracy) improve logic for setting invalids.
2781
For decode extra 64 (Hardware information and external GPS receiver configuration) improve logic for setting invalids.
2790
Add Dual Port RAM Status to decoder.
2909
Remove mention of "RT3000" in comments as this may cause confusion.
2921
Fix InnPitch / InnHeading mix up bug.
2946
Catch -1 issues in decode extra 29.
2963
Change enumeration storage type to a uint8_t and set functions accordingly. This should now be safer.
2964
Add output packet type interpolated to list of output packet types.
2965
Added the decoding of primary GPS position, velocity and raw rates, and secondary GPS raw rate (decode extra 64).
2966
Add GPS feature set two: Glonass, Galileo, RawRng, RawDop, RawL1, RawL2, RawL5.

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