initial commit: CAD files

Author: jmfriedt

CAD/gbsar_cad1.png

@@ -1,2 +1,13 @@
 # SDR-GB-SAR
+
 Opensource, openhardware implementation of a Software Defined Radio (SDR) Ground Based Synthetic-Aperture RADAR (GB-SAR)
+
+The instrument is a Ground-Based Synthetic-Aperture-RADAR using a commercial, off the shelf WiFi dongle as pseudo-random
+spectrum spread radiofrequency source, a Raspberry Pi 4 for data acquisition and antenna position control, and an Ettus
+Research B210 SDR dual channel receiver for RADAR data acquisition.
+
+The rail for moving the antenna set is a commercial, off the shelf device from <a href="https://www.iai-robot.co.jp/">IAI (Japan)</a>.
+
+<img src=CAD/gbsar_cad1.png>
+
+<img src=CAD/gbsar_cad2.png>