Archived - Replacement of the existing Digital Ionosonde Sounding System (DISS) with Next Generation Iononside (NEXION), 5 Wing Goose Bay, Happy Valley-Goose Bay, NL

Goose Bay, Canadian Forces Base (NL)

Reasons for a Federal Assessment
Project Description
Final Decision

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Reference Number

Canadian Environmental Assessment Registry: 09-01-49381

Environmental Assessment Type


Responsible or Regulated Authorities

National Defence

Reasons for a Federal Assessment

On June 26, 2009, it was determined that an environmental assessment was required in relation to the project because National Defence was the proponent for the project.

Project Description (as posted in the Notice of Commencement)

The purpose of the proposed project is to install the Next Generation Iononside NEXION). This system will replace current Digital Ionosonde Sounding Stem (DISS) which has 5 acre antenna footprint consisting of seven receive antennas and 10 kW transmit power output. The proposed NEXION system has 1 acre antenna footprint and 300 W transmitter power output. The NEXION system is unmanned vertical incidence radar that is used to obtain information about the behaviour of the overhead ionosphere in the form of digital ionograms, inospheric parameters and electron density profiles. NEXION data are assimilated into global ionosphere specification models used to predict ionospheric impacts to satellite communication, high frequency log-haul radio communications and Global Positioning System receivers. The proposed project will consist of two antenna fields located near existing building 512 north of Lahr Blvd. Transmit antenna field will be located north of building 512 and receive antenna field will be located east of building 512. Each antenna field will be connected to bldg 512 where Nexion office will be located. Connection cables and conduits will be installed underground. NEXION system is composed of a transceiver, dual 150W transmitters, a quad receiver, a signal processor, internet communications, a Global Positioning System receiver and data storage. The NEXION system consists of four vertical receive antennas and one transmit antenna. The optimum antenna height is 72 feet to 100 feet. The NEXION transmit antennas will emit non-ionizing radiation at a level lower than the current DISS antennas they are replacing. The NEXION antennas will not exceed the uncontrolled environmental Permissible Exposure Limit. Fence and warning signs will be installed around each antenna a field. Upon installation of the NEXION system near building 512, existing DISS system located near building 1234 will be decommissioned and demolished as another project. The NEXION system will provide ionospheric information for effective planning and execution of military operations that relay on propagation of electromagnetic signals in or through the ionosphere."

Final Decision

A decision was taken on May 25, 2010 and was that the authority may exercise any power or perform any duty or function with respect to the project because, after taking into consideration the screening report and taking into account the implementation of appropriate mitigation measures, the authority is of the opinion that the project is not likely to cause significant adverse environmental effects.