See-and-Avoid Collision Avoidance Using ADS-B Signal and Radar Sensing

Period of Performance: 01/01/2007 - 12/31/2007


Phase 2 SBIR

Recipient Firm

Intelligent Automation, Inc.
15400 Calhoun Dr, Suite 190
Rockville, MD 20855
Firm POC
Principal Investigator


IAI proposes an innovative collision avoidance radar and communication technology to detect and track both cooperative and non-cooperative targets. The system includes an L-band RF transceiver-sensor package, which continuously transmits Automatic Dependent Surveillance-Broadcast (ADS-B) compatible beacons to alert other cooperative aircraft and ATC (Air Traffic Control) ground stations regarding the aircraft's position and intent. In addition, it uses the reflected beacon signal as a radar signal to detect and track any non-cooperative targets within its effective range. A multifunctional RF transceiver serves as both the primary radar and secondary surveillance radar (SSR). The phase I effort has successfully demonstrated the concept of this technology in three areas: (1) Adding phase modulation to the 1090 ES carrier and proving it still complies with ADS-B waveform standard, (2) Coherent pulse compression for ranging (3) 3D angular estimation using TCAS-like circular antenna array and using innovative digital beamforming and spatial spectrum processing. In the phase II effort, we will work with commercial partners to build a 'brassboard' system and perform a series of system evaluation tests.