Velodyne VLF-1012 10, 400 Watt Peak Sub-.OBJECTIVE: Demonstrate new VLF receiver front end for NC3 airborne missions. 1,500 (lax > san gabriel valley ) pic hide this posting restore restore this posting. Avionics Navigation Systems 2nd Edition Complete Document One important feature of Omega/ VLF receivers is the difference in the algorithms for processing of Omega and VLF 2020 Polaris General XP1000. Stanford VLF receivers located around the world are used to detect perturbations to VLF transmitter signals associated with lightning.
Since that time, USAF VLF transmitters have significantly decreased, providing a much weaker signal for VLF receivers to copy. Receivers were designed in the 1970s and 1980s to accomplish this task in certain environments, against certain threats. DESCRIPTION: Current airborne VLF receiver technology for Emergency Action Message (EAM) reception must meet stringent reception capabilities in harsh environments.
The VLF Receiver front end must surpass state-of-the-art receiver specs (see reference). Compounding these obstacles to robust VLF reception in currently fielded equipment are obsolete technology, poor logistics and sustainment management, strict funding lines, and a decimated VLF industry base and expertise. In addition to these challenges, VLF receiver technology is expected to perform under the excessive noise of jamming sources and nuclear scintillated atmosphere (post Nuclear or high EM pulse event). This topic targets a front end technology that would require high sensitivity to copy messages at distance and fine selectivity to tune to a specific transmitter whose frequency may be very close to that of another transmitter. A new front end (that part of the VLF receiver between the antenna and demodulator) designed to copy both USAF and USN transmissions could address some of these problems, but this feature would add new problems of additional signals from transmitters occupying dense space in frequency. Relying on Navy VLF Transmitters dispersed around the world could pick up the slack, but current USAF VLF receivers cannot tune to them.
Determine which components are COTS available, and which require further development. PHASE I: Develop an architecture for a VLF receiver front end with high sensitivity (60dB out-of-band-rejection). The research and demonstration of this front end technology is independent of the three other VLF topic submissions (Flight line VLF transmitter, militarized VLF antenna, hardened Human Machine Interface for VLF receiver). The front end alone will not be enough to solve USAF survivable VLF reception issues, but a modular front end technology developed through SBIR could be integrated with other receiver subsystems in the future for full functionality.
PHASE III: Integrate VLF front end with operational VLF receive system for flight demonstration. Develop packaging requirements and interface control document to ensure flight worthiness. PHASE II: Design, build and test VLF receiver front end and demonstrate performance in a simulated stressed channel (airborne, jamming, long distance, atmospheric scintillation). The front end design must consider airborne NC3 mission requirements (Jammer & Noise rejection).
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