FAQ

 

 

INERTIAL SYSTEMS

How can I make sure that my AHRS / INS is in specification?

There is a standard procedure, a User Acceptance Test (UATR). This procedure must be done onshore with the unit in static condition (office/workshop/test bench). However it doesn't require any metrological tool.  In case you are not sure about this process, include the recorded data and settings file for the concerned unit in an email to support@ixblue.com. 

Is the AHRS \ INS compatible with my ____ input or output protocol?

The AHRS and INS units made by IXBLUE accept and output a wide range of protocols. A full list and description of these protocols can be found in the user manual document named INTERFACE LIBRARY. This document includes a description of each input and output protocol.

How accurate must my manual Latitude and manual speed setting be?

The latitude, along with the speed, is the most important input component in setting up OCTANS to operate correctly. In order to be in the specification, the manual latitude should be entered to within 0,5 degree. For example if you operate at 42.2 degrees, you must enter between 41.7 and 42.7 degrees in order for the unit performance to meet the specifications. The speed information should be set with an accuracy of ±1.5 knots. 

I get an "Output Full" message. What does it mean?

This message means the Data Output settings for the serial output are not correct.  
Often the output frequency is too high or the baudrate is too low in combination with the selected protocol value.

What is the latency on iXblue AHRS and INS products?

In general timing parameters are as follows (for details, refer to product specifications)
Latency:
2.35 ms on all serial ports
2.95 ms on Ethernet high priority port
< 5 ms on all other Ethernet ports
Jitter :
< 200 μs on all serial ports
< 400 μs on Ethernet high priority port
< 800 μs on all other Ethernet ports

How to retrieve the IP address of an AHRS / INS?

Factory default IP address is 192.168.36.1XX, with XX being the last two numbers of the serial number. If the IP address has been changed and is not known, the following steps shall be followed:
Connect the unit to the PC with repeater serial cable.
Open a hyper terminal window
Connect to the unit using the following configuration:
Baudrate: 19200
Parity: none
Stop bit: 1
Restart the unit
The IP address of the unit will be displayed on the screen during the boot up sequence.

What is the power consumption of an AHRS / INS?

iXblue AHRS / INS are known for the low power consumption which is below 25 Watts. Please check the spec sheet for each individual system.

I connect my AHRS to a GPS. Which messages should be used?

An AHRS needs Latitude and speed information to give the most accurate data. The information can be set manually in the AHRS, but when connected to a GPS the $GPGGA and $GPVTG messages are recommended. If the AHRS can be time synchronized, the $GPZDA or $UTC message can be configured. A PPS pulse is optional.

I connect my INS to a GPS. Which messages should be used?

An INS needs position info to be able to align itself. The $GPGGA message is recommended. It is also advised to add the $GPGST string which gives the standard deviation of the position. If the $GPGST message is not supplied, the INS will use the quality indicator in the telegram (which is a less accurate and robust option). For time synchronization, $GPZDA or UTC timetag message is required. When precise time synchronization is need, PPS shall be supplied to the INS. These Input data should be sent at 1Hz.

Can I send USBL data to my INS in a GGA format?

No, this should not be performed as it may affect system performances. Contact support for more details.

How accurate must my (GPS) leverarm be?

It is recommended to use lever arms 10x more accurate than the sensor measurement accuracy. For example, within 10cm for a 1m accurate GPS and within 1cm for a 10cm accurate GPS. This will ensure your lever arms will not affect the performance of your system.

 

 

 

Delphins

Where can I download the latest version?

The link to download the DELPHINS version is https://secure.ixblue.com/delph-ins​

What is the minimun needed output frequency for the post processing protocol?

The minimum output frequency is 50 Hz, but for survey application it's better to have the output at 100Hz or at 200Hz.

How accurate must my (GPS) leverarm be?

It is recommended to use lever arms 10x more accurate than the sensor measurement accuracy. For example, within 10cm for a 1m accurate GPS and within 1cm for a 10cm accurate GPS. This will ensure your lever arms will not affect the performance of your system.

After launching DELPH INS the message "No license detected" is displayed and the access to the common features of the software is disabled.

This error message can be displayed in three situations :

 

After a re-installation of the software you need to unplug and then re-plug the dongle, otherwise the dongle is not recognized.

 

When the Sentinel driver (the dongle's driver) is not correctly installed. DELPH INS installs automatically the driver but in different situation this default installation fails, in this case you need to download the Sentinel installation program from the SafeNet web site and install it manually (unplug the dongle before installing the driver).

 

When the version of the application you try to launch is too recent regarding the end warranty date hard coded into your dongle. You can display the content of your dongle using the License. command of the ? menu. You can display the date of release of your current version using the About DELPH INS. command from the ? menu. Contact IXSEA if you want to upgrade your dongle.

Is it possible to run DELPH INS on Mac OS

DELPH INS is only running on Windows operating system. To run DELPH INS on Mac you must install a virtual machine software as Oracle Virtual Box and run DELPH INS inside the virtual machine.

 

Do not install the Sentinel driver on the Mac operating system otherwise the dongle will be locked on it and not available for the virtual machine.

During the installation of DELPH INS the message ".msxml4.dll failed to register." appears.

You need to install the MSXML4 module manually. The installation program can be downloaded from the Microsoft web site. You need to install the MSXML4 module manually. The installation program can be downloaded from the Microsoft web site.

Is it possible to run several versions of DELPH INS on the same computer?

1. Install a first version of DELPH INS (let's say 3.0.5)

2. Copy the folder C:\Program Files (x86)\iXBlue\DELPH INS Subsea into another location (let's say C:\DELPH INS Subsea\3.0.5).

3. Uninstall DELPH INS

4. Install another version of DELPH INS (let's say 3.0.7)

5. Copy the folder C:\Program Files (x86)\iXBlue\DELPH INS Subsea into another location (let's say C:\DELPH INS Subsea\3.0.7).

6. Uninstall DELPH INS

7. Make two shortcuts on your desktop. First one "DELPH INS Subsea 3.0.5" to C:\DELPH INS Subsea\3.0.5\DelphIns.exe and second one "DELPH INS Subsea 3.0.7" to C:\DELPH INS Subsea\3.0.7\DelphIns.exe

You know have two versions of DELPH INS installed side by side.

When data are imported, I have the following message: WARNING : Suspicious UTC data will not be used for clock drift compensation (simulation time 1.07, utc time [.]

The warning messages during the conversion of the raw data file indicates that the UTC synchronization of the INS during the survey is bad (no PPS). During the conversion of the raw data file, DELPH INS use the UTC synchronization data to suppress the drift of the internal clock of the INS but in this case this feature have a bad effect due to the fact that the ZDA data is not received regularly by the INS.

You should turn off the automatic drift compensation by editing the PostProPhinsDecode.conf.xml located in the DELPH INS installation folder (C:\Program Files (x86)\IXBLUE\DELPH INS or C:\Program Files\IXBLUE\DELPH INS) and change the setting compensateClockDrift from true to false. After converting the file think to revert this value to true.

How to concatenate multiple post-processing files

Q : When using the data logger from the web based MMI it is possible to split the data in multiple files. DELPH INS can not handle multiple raw post-processing data files, how to use those files?

R : You need to concatenate the split files into a single file before loading it into DELPH INS. The COPY command from the command line can be used to do that:

COPY /B file01.dat+file02.dat+file03.dat result.dat

Since version v.2.4 DELPH INS can load multiple raw post-processing data files and perform the concatenation of those data files.