Ground Based SAR Data of Cardboard box with Aluminium Bottles for Anomaly Detection
Description
The dataset consists of 155 raw Ground Based SAR (GBSAR) data examples for anomaly detection outside of visible area. Specifically, 5 aluminium bottles are set in the card box. 4 different scenes are recorded: 1. without anomaly (50 examples) 2. with anomaly placed instead of the first bottle (35 examples) 3. with anomaly placed instead of the third bottle (35 examples) 4. with anomaly placed instead of the fifth bottle (35 examples) Each example is stored as matrix in .txt format. Matrix is size of 1024x24 (1024 frequency points, 24 GBSAR steps) Raw data is obtained using developed GBSAR system. It works in stop-and-go mode with 1 cm step size and total aperture of 24 cm. GBSAR sensor is FMCW (Frequency Modulated Continuous Wave) radar with central frequency at 24 GHz and 1.3 GHz wide bandwidth. FMCW radar periodically transmits sawtooth signal every 166 ms. Wave polarization of FMCW radar is set to vertical. This work was supported in part by Croatian Science Foundation (HRZZ) under the project number IP-2019-04-1064.
Files
Steps to reproduce
Developed GBSAR is based on Raspberry Pi 4B (RPi) microcomputer. It controls VCO in FMCW module Innosent IVS-362 (https://www.innosent.de/radarsensoren/ivs-series/ivs-362/) which has integrated transmitting and receiving antenna, and mixer. RPi and FMCW module are set on the platform which is moved along the rail track for 1 cm in each step with 5V stepper motor also controlled by RPi. Process of measurement: The module in each step transmits and receives signals, mixes them and result signal in low frequency band sends to the microcomputer. In order to maximize SNR, in each step the system emits multiple signals (in our case 10) and stores the average of received ones. When the result is stored, RPi runs stepper motor to move the platform for one step (in our case 1 cm). The process continues until it reaches last step. After that obtained matrix of average signals from each step is saved. RealSAR-RAW contains obtained matrices from the measurements in .txt format.