Q: What is adaptive nulling vs. adaptive beamforming? What are the advantages and disadvantages?

A: Adaptive arrays are perhaps the single most powerful antijamming tool in the GNSS systems engineer’s toolkit. They can provide anywhere from 15 to 90 dB of jamming rejection depending on the specific architecture used. Their main disadvantage is that they require an array of antenna elements, each spaced about four inches apart (center to center), and thus are physically large.

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The development and testing of precision ballistic and guided weapons require the occasional discharge of those weapons. For newer weapons with greater operational envelopes, this often requires testing over very large areas. To meet this growing requirement, weapon testing and training has migrated from land based firing ranges to offshore ranges, such as the U.S. Air Force (USAF) Eglin Joint Offshore Test and Training Area in the Gulf of Mexico near the northern coast of Florida.

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The Bush Administration’s Fiscal Year 2007 (FY07) budget proposal for the Department of Defense (DoD), announced in February, allocates $315,314,000 in advanced technology…

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The Russian Space Forces are continuing efforts to bring the final two GLONASS spacecraft launched December 25 into operation. One of the trio…

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Japan launched its second Multi-Functional Transport Satellite (MTSAT-2) on February 18, opening a new phase of precision air navigation and air traffic control…

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Russia gave a Christmas gift to the GNSS world with its launch of three GLONASS satellites, including two modernized GLONASS-M spacecraft, on December…

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Matthias Ruete has been named as director-general of the European Commission’s Directorate- General for Energy and Transport (EC DG-TREN), which has overall responsibility…

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Civil GPS users now have a second full signal available to them — albeit on only one satellite and “at the user’s own…

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European Space Agency (ESA) and Surrey Satellite Technology Ltd.(SSTL) operators have completed the on-orbit preparations and activated the navigation payload for GIOVE-A, the…

By Inside GNSS