News Item

US passes bill requiring eLoran to safeguard GPS

Last week the House of Representatives passed the Department of Homeland Security Act of 2017, requiring a GPS complementary and backup capability

The Bill included provisions for the US Coast Guard - a Department of Homeland Security (DHS) agency - which require establishment of an eLoran system to provide the 'complementary and backup' capability. It includes:

- (a) eLoran: Subject to the availability of appropriations, the Secretary shall provide for the establishment, sustainment, and operation of a reliable land-based enhanced Loran, or eLoran, positioning, navigation and timing system.
- (b) Purpose: The purpose of the system established under subsection (a) is to provide a complement to, and backup for, the Global Positioning System (in this section referred to as ‘GPS’) to ensure the availability of uncorrupted and nondegraded positioning, navigation, and timing signals for military and civilian users in the event that GPS signals are corrupted, degraded, unreliable, or otherwise unavailable.
- (c) Requirements: The system established under subsection (a) shall:
   - (1) be wireless
   - (2) be terrestrial
   - (3) provide wide-area coverage
   - (4) transmit a precise, high-power signal in the 100 kHz spectrum and meet the one microsecond accuracy requirement specified in the Federal Radio Navigation Plan
   - (5) be synchronized with coordinated universal time
   - (6) be resilient and extremely difficult to disrupt or degrade
   - (7) be able to penetrate underground and inside buildings
   - (8) be capable of deployment to remote locations
   - (9) take full advantage of the infrastructure of the existing, unused Coast Guard long-range navigation system (commonly known as ‘Loran-C’), and subject to the concurrence and agreement of other agencies, unused facilities associated with the Ground Wave Emergency Network and Nationwide Differential GPS systems
   - (10) utilize and leverage the capabilities of the entity for development, building, and operation of the system
   - (11) function in an interoperable and complementary manner with other similar positioning, navigation, and timing systems
   - (12) be made available by the Secretary for use by other Federal agencies for public purposes at no cost
   - (13) incorporate such other requirements determined necessary by the Secretary with respect to such agencies.

Details from Dana A Goward, President, Resilient Navigation & Timing (RNT) Foundation at the link below . . There will be a Resilient Forum on the eve of INC 2017 on 27 November at Brighton - see the INC link below . .

Pic from Wikimedia

  • 22 July 2017
  • RIN

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