MOBATIME DTS 4160.grandmaster Combined Time Distribution and Synchronization Device User Manual
- June 30, 2024
- MOBATIME
Table of Contents
DTS 4160.grandmaster Combined Time Distribution and Synchronization
Device
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Product Information
Specifications
- Product Name: GNSS Security Feature User Manual
- Models: DTS 4160.grandmaster, DTS 4210.timecenter
- Firmware Version: V1.26.x (released March 2024) and newer
- Hardware Revisions:
- DTS 4210: 121059.11
- DTS 4160c: 122033.08 (with option E1)
- DTS 4160c: 137888.00 (standard)
- MOBA-NMS Version: 2.12.x or higher
Product Usage Instructions
General Information: Introduction
Introducing the GNSS Security Feature User Manual for DTS 4160
and DTS 4210 models.
Requirements
-
Firmware: Ensure firmware version is V1.26.x
or higher for GNSS security system activation. -
Hardware: Minimum hardware revisions required
for different models. -
MOBA-NMS: Use MOBA-NMS Version 2.12.x or
higher.
Introduction
Learn about the fundamentals of GNSS signal disturbance,
jamming, and spoofing to understand the security feature.
Configuration
-
Access the system settings on your device.
-
Import the necessary license for GNSS security feature.
-
Adjust GNSS security system parameters in MOBA-NMS
software. -
Verify GNSS security status after configuration.
Technical Data
Refer to the technical data section for detailed specifications
and additional information.
FAQ
What is Jamming?
Jamming refers to the transmission of interfering signals with
the aim of degrading the GNSS measurement quality or denying GNSS
services.
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GNSS SECURITY FEATURE USER MANUAL
DTS 4160.grandmaster DTS 4210.timecenter
Important Note: This Manual is applicable for Firmware version V1.26.x (released March 2024) and newer.
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References to the Instruction Manual
1. The information in this Instruction Manual can be changed at any time
without notice. The current version is available for download on
www.mobatime.com.
2. The device software is continuously being optimized and supplemented with
new options. For this reason, the newest software version can be obtained from
the Mobatime website.
3. This Instruction Manual has been composed with the utmost care, in order
to explain all details in respect of the operation of the product. Should you,
nevertheless, have questions or discover errors in this Manual, please contact
us.
3. We do not answer for direct or indirect damages, which could occur, when
using this Manual. 4. Please read the instructions carefully and only start
setting-up the product, after you have correctly
understood all the information for the installation and operation. 5. The
installation must only be carried out by skilled staff. 6. It is prohibited to
reproduce, to store in a computer system or to transfer this publication in a
way or
another, even part of it. The copyright remains with all the rights with BÜRK
MOBATIME GmbH, D-78026 VS-Schwenningen and MOSER-BAER AG CH 3454 Sumiswald /
SWITZERLAND.
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Table of contents
1 General Information: Introduction
4
1.1 License model
4
1.2 Requirements
4
1.2.1 Firmware
4
1.2.2 Hardware
4
1.2.3 MOBA-NMS
4
1.3 Introduction
5
1.3.1 Disturbance of GNSS signals – Fundamentals
5
1.3.2 Jamming
6
1.3.3 Spoofing
7
1.4 General Methodology
8
1.5 Mobatime Implementation
8
1.6 Supported device types for the GNSS security feature
9
2 Configuration
10
2.1 Activation of GNSS Security system Step by step
10
2.2 Import license
11
2.3 GNSS Security system parameters in MOBA-NMS
12
2.4 Check GNSS security status
14
A Technical data
15
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1 General Information: Introduction
1.1 License model The GNSS security system needs a license installed on the
DTS Grandmaster. Requirements / description: One-time license per device. The
license activates the GIDAS Embedded software features for a customer device
and includes the usage of the GIDAS background IP. The license validity does
not end. The license is bound to a specific device and cannot be transferred.
The license does not include future upgrades. Future upgrades to the
functionality of GIDAS Embedded are possible, but not automatically included.
Please contact MOBATIME sales to order a license: export@mobatime.com
1.2 Requirements
1.2.1 Firmware To be able to activate the GNSS security system, you need the
DTS firmware version V1.26.x or higher.
1.2.2 Hardware Min. required hardware revisions: DTS 4210: 121059.11 DTS
4160c: 122033.08 (with option E1) DTS 4160c: 137888.00 (standard)
1.2.3 MOBA-NMS MOBA-NMS Version 2.12.x or higher.
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1.3 Introduction
1.3.1 Disturbance of GNSS signals – Fundamentals GNSS are complex systems ->
multiple error sources are possible. Received signals are relatively week: –
Power is like a 100W light bulb in 20’000km distance – GNSS frequency bands
are dominated by white noise GPS signal design dates to 70/80s – Design of
civil signals is publicly known – At the time of design, intentional
interference was not considered.
Common unintentional interference Out-of-band-emissions (unwanted,
uncertified): – Wi-Fi Cameras – Power supplies – Cheap consumer electronics
Harmonics within the GNSS frequency bands: – Mis-tuned RF equipment Near-far
effect and insufficient filtering: – Any other RF components close to the GNSS
antenna In this document, the term interference is limited to jamming and
spoofing.
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1.3.2 Jamming
What is Jamming?
Jamming refers to the transmission of interfering signals with the aim of
degrading the GNSS measurement quality or denying GNSS services.
This means, emitting of strong electronic “noise” in the same frequency band
as the GNSS signals, which prevents the receiver from getting the wanted GNSS
signals.
The jamming signal is saturating the low noise amplifier in the antenna and as
a result no signal is passed to the receiver.
Who is able to perform Jamming?
GNSS jamming is illegal in most countries The equipment is simple and
available for a low budget. Almost no knowledge is needed Due to the low
signal level of GNSS a jamming attack can disable reception over a
large area. Jamming is also possible through unintentional installations, see
chapter 1.3.1.
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1.3.3 Spoofing
What is Spoofing?
Spoofing is the transmission of false GNSS signals with the aim of
deliberately falsifying GNSS-based time measurement.
This means, spoofing is a malicious attempt to manipulate the GNSS based time
or position of a receiver by generating and transmitting fake GNSS signals.
With these forged signals the spoofer tries to lead the receiver to a false
position or time.
Who is able to perform Spoofing?
There are many different levels of attacks to consider:
With modern and cheap devices and an antenna, a simple spoofing attack can be
performed. Almost no knowledge is needed. -> But this kind of attack can be
detected from the GNSS modules (time jump or too high signal level) and do not
lead to an issue.
A sophisticated spoofing attack requires professional equipment and a deep
knowledge of the GNSS system to recreate the GNSS signal without noticing by
the receiver module. ->These kind of attempts are hard to detect and the best
solution is to have more than one source to compare, or using a special GNSS
security system offered with this feature.
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1.4 General Methodology
The general methodology within GIDAS Embedded relies on the usage of multiple
individual detectors for jamming and spoofing. These detectors are
independently evaluated and provide (within their respective capabilities and
limits) a monitoring result, indicating jamming, spoofing or normal
operations.
For the final interference detection decision, all individual detector results
are combined within a weighted approach, accounting for the strengths and
weaknesses of the individual detectors. This approach ensures that the
strengths of certain detectors can overcome the weaknesses of others and vice
versa. The threshold settings and combination weightings are chosen
empirically optimized for detection sensitivity while at the same time
maintaining a reasonable false alarm rate.
1.5 Mobatime Implementation
The key components consist of the GNSS receiver module of the MOBATime
application and the GIDAS library developed by OHB. Time and state are
regularly sent to the application while the raw data from the GNSS receiver
module is permanently transmitted to the GIDAS library.
The DTS application receives the overall security state as well as the
different detector states as a return value. Using the severity levels
(jamming & spoofing), the return values are classified as ,,GNSS security
warning” and ,,GNSS security error”.
A warning is forwarded to the Network Management System (NMS) and any third-
party systems for information purposes only. Low risk of interference detected
– No action for the time server in this scenario. If one or both severity
levels exceed the threshold value of 20%, this leads to an error.
Similar to the warning, the error is forwarded to the NMS and any third-party
systems, but the DTS application discards the GNSS source signal as a time
source and goes into holdover as long as the error is present. Once the GNSS
signal has been released by the GIDAS library, the time server switches back
from holdover to normal operation.
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1.6 Supported device types for the GNSS security feature
Model DTS 4210.timecenter
Oscillator type Rubidium
Holdover G811
Product no. 125600
Type
Model
Oscillator type
C
DTS 4160c. grandmaster
Rubidium
Compatibility according to
oscillator
G811
Options
Product no.
Standard (without E1) With option E1
137888 122033
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2 Configuration
2.1 Activation of GNSS Security system Step by step
1. Connect GNSS antenna to the grandmaster device. Time source GNSS must be
configured. Select “Constellation Mode” e.g. GPS & Galileo & Beidou
2. Leave GNSS security mode to “off”
3. Wait until the device is properly synchronized (no alarm and synch LED =
on) (this takes approx.. 20 Min.)
4. Wait another 30 minutes until the GNSS module is showing stable position
data from the antenna position. Take a screenshot of the GNSS time source
details in “Overview” Tab:
5. Go back to “Time handling” Tab and set GNSS Security values (steps 7 to 9)
6. Set GNSS Security Mode to “on” (do not press “Save” button until step 10)
7. Import GNSS security license file, see chapter 2.2. 8. Select “Antenna
type” 9. Set “Position Mode” to “Manually” and enter the antenna position data
(values
from screenshot or exact position data from a map). See chapter 2.3. 10. Press
“Save” button to store the configuration. Important: The GNSS module will now
restart and this could release temporarily
warnings or alarms.
11. Check GNSS security status, see chapter 2.4.
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2.2 Import license The licence file can be imported via MOBA-NMS only (Version 2.12.x or higher): 1) Open the device view and click on the Tab “Time handling”.
- Click on the blue “Import” link to select the license file from a folder on your PC:
Once the license is successfully activated, the other parameters in the frame “GNSS Security” can be selected and configured.
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2.3 GNSS Security system parameters in MOBA-NMS The configuration parameters are located in the NMS Tab “Time Handling”. The GNSS Security can be used only with time source “GNSS”.
Path: Time Handling GNSS settings
The frame “GNSS Security” show the configuration parameter:
Switch on or off the GNSS security:
Security Mode:
on / off
Security suite license:
click on “Import” to select the license file
Antenna type:
default: PCTel
PCTel GPSGL Tallysman 3742
Source drop on Al. Sec. Warning: off (default, recommended) Security warnings are only reported in the Alarm History on: each warning releases an alarm in the device
Position Mode:
Manually (default)
The position of the antenna needs to be entered manually. Auto (future option)
Important: After first commissioning of the device, wait until the GNSS
synchronization is completed and the device is properly synchronized. This
usually takes approx. 20 minutes. After this time, wait another approx. 30
minutes.
Then select the “Overview” Tab and GNSS Source “Details”, see next page.
There you find the exact position data of the antenna. Enter this values in
the position fields below.
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Find antenna position data:
Latitude in degrees: Longitude in degrees: Hight above ellipsoid in m:
Position latitude from antenna position + Value = N – Value = S
Position latitude from antenna position + Value = W – Value = E
Height above ellipsoid from antenna position
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2.4 Check GNSS security status MOBA-NMS: Tab: Time handling Frame: GNSS
Source Click on GNSS Security Suite enables -> Details
GNSS security status:
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A Technical data
Further technical specifications can be requested from MOBATIME.
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© MOBATIME
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