Accession Number:

ADA517552

Title:

Wide Field of View Imaging with a VHF Phased Array

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV

Report Date:

2008-01-01

Pagination or Media Count:

3.0

Abstract:

The Long Wavelength Array LWA httplwa.unm.edu is an ONR-funded project to design and construct a large, next-generation facility focusing on both ionospheric and astronomical research and operating in the high frequency HF and very high frequency VHF bands 20-80 MHz. The baseline design for the LWA consists of approximately 50 dipole-based phased-array stations, with each station consisting of 256 dual-polarization dipoles, distributed over approximately 400 km in the state of New Mexico. In operation, the stations themselves would be phased together to form a radio interferometer. The Long Wavelength Demonstrator Array LWDA was funded by NRL and developed jointly by NRL and the Applied Research Laboratories of the University of Texas at Austin ARLUT, with assistance from the University of New Mexico. The LWDA serves as a technology and scientific testbed for the LWA project by fielding prototype hardware and by providing experience with site preparation, radio frequency interference monitoring and mitigation, software development, environmental concerns, and initial science capability. The LWDA consists of 16 dual linear polarization dipoles, tunable in the frequency range of 60 to 80 MHz with an instantaneous received bandwidth of 1.6 MHz. The dipoles have an intrinsically large field of view field of regard and images of the entire sky are now being produced routinely. As part of the scientific prototyping work with the LWDA, these images are being used to search for transient celestial radio emitters at higher sensitivity levels than previously accessible. The LWDA also has obtained data, currently under study, containing passive radar observations of meteor scatter, anomalous propagation phenomena, and aircraft.

Subject Categories:

  • Electrical and Electronic Equipment
  • Defense Systems
  • Active and Passive Radar Detection and Equipment
  • Optics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE