AERPAW UAV-based signal data collected at varying altitudes and sampling rates for wireless communication studies

This dataset contains wireless communication signal data collected from an unmanned aerial vehicle (UAV) at different altitudes (40 m, 70 m, and 100 m). For the 40 m altitude, data was collected at varying sampling rates (5 MHz, 10 MHz, and 20 MHz), corresponding to bandwidths of 1.25 MHz, 2.5 MHz, and 5 MHz, respectively. The IQ recordings were made using USRP B210 devices at five fixed nodes (LW1-LW5). The dataset includes IQ samples, GPS coordinates, and received signal strength (RSS) values stored in SigMF format files. A Python script (example.py) is provided for data processing and visualization.

Methods
Trajectory and Altitudes: The UAV followed the same trajectory path at three different altitudes: 40 m, 70 m, and 100 m.

Sampling Rates: For the 40 m altitude, data was collected using three different sampling rates: 5 MHz, 10 MHz, and 20 MHz, corresponding to bandwidths of 1.25 MHz, 2.5 MHz, and 5 MHz, respectively.

Data Collection Intervals: To reduce data volume, the system collected data for 20 ms intervals every 100 ms.

USRP B210 Devices: The IQ recordings were made using USRP B210 devices placed at the five fixed nodes (LW1-LW5). Each SigMF file contains IQ samples for two channels corresponding to the USRP's dual-channel configuration.

GPS and Radio Measurements:

GPS coordinates (GPSx, GPSy, GPSz) were measured once per second, independent of the time at which the radio measurements were made.
Radio measurements may have occurred more than once per second or not at exactly the same time as the GPS measurements.
GPS and radio measurements are both time-stamped, and interpolation was used to calculate mX, mY, mZ values, which align the GPS data with the radio measurements based on their timestamps.

Folder Structure:

Each altitude (40 m, 70 m, 100 m) is represented by a folder. Within the 40 m folder, subfolders represent the three different sampling rates (5 MHz, 10 MHz, and 20 MHz).
For each altitude and sampling rate combination, the dataset contains subfolders for five fixed nodes (LW1, LW2, LW3, LW4, and LW5). The locations of these nodes are detailed in the "LW1-5_locations.txt" file.

File Descriptions:

SigMF Files:

results_3320000000_5000000_2024_07_15_12_26_01_248.sigmf-data: Contains IQ samples recorded at a frequency of 3320000000 Hz and a sampling rate of 5 MHz. The file contains two channels, one for each of the USRP B210 device's channels.

GPS Data:

gps_data.sigmf-data: Contains timestamped GPS coordinates of the UAV (GPSx, GPSy, GPSz), measured once per second.

Measurement Data:

measurement_rss_data.sigmf-data: Contains RSS data and interpolated position measurements (mX, mY, mZ) for each timestamp, with RSS1 for channel 1 and RSS2 for channel 2.

Python Script:

example.py: This Python script demonstrates how to load and process the data from the SigMF files.

It uses libraries such as numpy, json, and matplotlib for loading data and plotting results.
The script loads GPS metadata from gps_data.sigmf-meta and extracts position (GPSx, GPSy, GPSz) and timestamps.
It also loads radio measurement data from measurement_rss_data.sigmf-meta and interpolates GPS data to align with radio measurements to compute positions (mX, mY, mZ) for further analysis.
The script includes plotting functionalities to visualize the GPS trajectory and the corresponding RSS data over time.