MIDS© – Mobile Interference Detection System
GNSS signals can be affected by intentional or unintentional interference, known as jamming. This interference can cause systems based on or controlled by GNSS to function with diminished capacity or to fail altogether. MIDS makes it possible to automatically detect the sources of interference and characterize them. Every detected source of interference is archived for further analysis or purposes of documentation. Findings based on archived data are evaluated and presented in an automated manner.
TeleOrbit’s MIDS offers a capable and attractively priced mobile solution for interference monitoring.
The system consists of three components, a GNSS low horizon gain antenna, a powerful GNSS RF front-end as well as a unique software solution able to detect various kinds of interference signals.
GNSSA-LHG: GNSS Low Horizon Gain Antenna
MIDS utilizes a special low horizon gain (LHG) receive antenna to better detect interference signals close to the horizon.
The radiation patterns below show the difference between our low horizon gain LHG antenna in comparison to a professional geodetic antenna.
Profesional geodetic GNSS antenna:
GNSS Low Horizon Gain Antenna:
MGSE© REC: GNSS Radio Frequency Front-End
The high-end GNSS radio frequency front-end offers up to three simultaneously sampled radio frequency (RF) reception chains. Each individual RF chain can be pre-configured to GPS, Galileo, GLONASS, BeiDou. Bandwidth, bitwidth, sampling rate and intermediate frequency can be configured to customers’ needs.
SAFIR: System capable of multiple configurations for detecting and characterizing jammers
The MIDS hardware requires a powerful and efficient software which detects, characterises, and archives potential interference signals.
Here’s a summary of the main features of SAFIR:
– Automatic detection and characterization of jammers
– Support for all GNSS frequency bands, including Galileo Public Regulated Service (PRS)
– Mobile operation enables pedestrian and/or vehicle applications
– Archiving of identified sources of interference
– Open system:
> Custom specification (frequency bands, bandwidths, dynamics)
> Custom detection thresholds
> Incorporation of the user’s own developments/add-ons
Potential Use Cases for MIDS
– Stationary monitoring and detection of sources of interference in conjunction with existing GNSS stations
– Mobile operation for measuring campaigns, GNSS availability checks, and interference hotspot mapping
Available GNSS-Configurations for MIDS
Configuration 1:
– Rx#2: L1/E1/G1 (1588.8 MHz center frequency, 38 MHz analog bandwidth, 40.5 MHz sample rate @ 8 bit I/Q) and
– Rx#1: L2/L2c/G2 (1232.5 MHz center frequency, 38 MHz analog bandwidth, 40.5 MHz sample rate @ 8 bit I/Q)
Configuration 2:
– Rx#2: L1/E1/G1 (1574.9 MHz center frequency, 54 MHz analog bandwidth, 81 MHz sample rate @ 4 bit I/Q) and
– Rx#3: E6 (1278.7 MHz center frequency, 54 MHz analog bandwidth, 81 MHz sample rate @ 4 bit I/Q).
Configuration 3:
– Rx#2: L1/E1/G1 (1574.9 MHz center frequency, 54 MHz analog bandwidth, 81 MHz sample rate @ 4 bit I/Q) and
– Rx#3: L5/E5/G3/B2 (1192.5 MHz center frequency, 54 MHz analog bandwidth, 81 MHz sample rate @ 4 bit I/Q).
Other configurations are available on request.
References:
https://www.iis.fraunhofer.de/en/ff/lv/lok/proj/safir.html
https://www.iis.fraunhofer.de/content/dam/iis/de/doc/lv/los/lokalisierung/SatNAV/IONPNT2017_InterferenceDetectionStation.pdf
https://teleorbit.eu/en/satnav/mgse-rec/