Fraunhofer-Institut für Integrierte Schaltungen IIS- Portable USB 3.0 device
- Supports all GNSS signals
- 3 bands received simultaneously
- Up to 80 MHz RF-BW @ 8 Bit I/Q
- Multi-antenna support
- User-friendly GUI and API
© Fraunhofer IIS/Alexander Rügamer
Flexiband USB Front-end
Flexiband Triband L125 (III-1b extended) Configuration
The following Flexiband L125 III-1b configuration was used:
| Configuration | Frequency Band | Bandwithd (MHz) | Center Frequency (MHz) | Intermediate Frequency (MHz) | Sampling Rate (MHz) | Sample Bit Withd | USB data rate (MBit/s) |
| L125 III-1b | L1/E1bc | 18 | 1575,420 | 0 | 20 | 2x 4 (complex) | 640 |
| L2/L2C | 18 | 1227,600 | 0 | 20 | 2x 4 (complex) | ||
| L5/E5a | 38 | 1176,450 | 0 | 40 | 2x 4 (complex) |
Spirent GSS8000 GPS/Galileo Signal Generator
Simulated Spirent GPS/Galileo scenario
Using a static scenario we recorded one 210 s and one 15 s long set of data using the previously described L125 Flexiband Configuration III-1b.
The multiplexed, raw data streams are available here (L125_III1b_15s.usb, L125_III1b_210s.usb). The description of the exact multiplexed data format will be provided in an updated version of this page. Please unzip before using.
The demultiplexed data streams were extended to an 8bit/sample I/Q format can be found here:
- L1/E1 (L125_III1b_15s_L1.bin, L125_III1b_210s_L1)
- L2 (L125_III1b_15s_L2.bin, L125_III1b_210s_L2)
- L5/E5a (L125_III1b_15s_L5.bin, L125_III1b_210s_L5)
The following Matlab code example can be used to read in the raw, demultiplexed data, please unzip before using:
FS = 20e6; % Sampling Rate for L1 / L2; FS = 40e6 for L5 freqIF = 0; % Same for L1, L2 and L5 NrOfSamples = 1e6; fid = fopen(L125_III1b_15s_L1.bin', 'r'); A = fread(fid, NrOfSamples, 'int8'); % 8 bit / sample fclose(fid); data_i = A(1:2:end); data_q = A(2:2:end); input_cmplx=data_i + j*data_q; |
Note that the I and Q components are Multiplexed: 8bit-I | 8bit-Q | ....
The simulated Spirent scenario is depicted in figure "Simulated Spirent GPS/Galileo scenario":
The exact simulated satellite information is available upon request.
Roof Antenna Fraunhofer IIS, Nuremberg
Installation von Referenzantennen auf dem Institutsgebäude des Fraunhofer IIS
Moreover, 15 s and 210 s long raw data collections have been carried out with the same Flexiband unit and configuration using the roof antenna of Fraunhofer IIS. The filenames indicate the date/time when the data was collected.
The multiplexed, raw data streams are available here (20140923_20-15-55_L125_roof_15s.usb, 20140923_20-15-55_L125_roof_210s.usb). The description of the exact multiplexed data format will be provided in an updated version of this page.
The demultiplexed data streams were extended to an 8bit/sample I/Q format can be found here, please unzip before using:
Measurement Campaign, Hanoi, Vietnam
In a measurement campaign carried out in Hanoi, Vietnam, in October 2017, the Flexiband was used to record different sets of wideband L1/E1/G1/B1, L5/E5a and S-band signals, including the IRNSS on L5 and S-Band. The following one minute long sample file uses the configuration III-7a as described in the table below and in the 20171017_09-51-43_III-7a_short.zip (see link below the table) description according to the ION SDR Metadata standard.
The test and measurement campaign at the NAVIS centre in Hanoi, Vietnam, has been co-funded by the BELS Project (Building European Links toward South East Asia in the field of EGNSS).
| Configuration | Frequency Band | Bandwithd (MHz) | Center Frequency (MHz) | Intermediate Frequency (MHz) | Sampling Rate (MHz) | Sample Bit Withd | USB data rate (MBit/s) |
| III-7a | L1/E1abc/G1/B1 | 54 | 1580.000000 | L1: -4.580 G1: 22.000 |
81 | 2x 4 (complex) | 972 |
| IRNSS-S | 18 | 2491.250000 | 0.778000 | 20.25 | 2x 4 (complex) | ||
| L5/E5a | 38 | 1173.546875 | 2.905000 | 40.5 | 2x 2 (complex) |
Spoofing Data Sets
The snapshot-based spoofing detection datasets are the processed outputs for a multi-antenna snapshot receiver. So far, machine learning based spoofing detection has shown good performance [Blind Spoofing Detection for Multi-Antenna Snapshot Receivers using Machine-Learning Techniques].
The first dataset consists of recorded GNSS signals and laboratory spoofing setups [Recorded Snapshot Spoofing Dataset.csv]. The separate measurement setups and the fields recorded in the dataset are documented in this spreadsheet [Dataset Description.xlsx].
The second dataset [Simulated Snapshot Spoofing Dataset.csv] simulates the snapshot outputs. The simulated data has more variance and has been shown to improve machine-learning techniques [Blind Spoofing Detection for Multi-Antenna Snapshot Receivers using Machine-Learning Techniques]. Extra information used for each data point is also available [Simulated Snapshot Spoofing Dataset Extra Info.csv]. The simulation environment is published in an ION GNSS+ 2020 conference paper [Blind Spoofing Detection for Multi-Antenna Snapshot Receivers using Machine-Learning Techniques]. Please contact us for more extensive simulation datasets or specific simulation requirements.
License
All example files are provided under a “Creative Commons” BY- NC license:
http://de.creativecommons.org/
That means you are free to use these recorded files for non-commercial work while giving credit to Fraunhofer IIS and citing this website.