HF Software Receiver Arrays (HFSRA)

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-07-C-0158
Agency Tracking Number: F074-031-0455
Amount: $99,998.00
Phase: Phase I
Program: STTR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: AF07-T031
Solicitation Number: N/A
Small Business Information
11118 Quail Pass, San Antonio, TX, 78249
DUNS: 601975803
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Geoff Crowley
 President/Chief Scientist
 (210) 834-3475
Business Contact
 Geoff Crowley
Title: President/Chief Scientist
Phone: (210) 834-3475
Email: gcrowley@astraspace.net
Research Institution
 R. B Kalmbach
 6220 Culebra Road
San Antonio, TX, 78238 5166
 (210) 522-2261
 Domestic nonprofit research organization
Accurate real-time knowledge of the bottomside ionosphere is necessary for covert HF communications, near vertical incidence sounding, and geolocation of HF transmitters. Sky-wave TDOA geolocation is the "holy grail" of HF geolocation techniques due to its passive nature, low cost, and easy deployment. To achieve sky-wave TDOA it is necessary to know the dominant mode of propagation, which requires accurate knowledge of the bottomside ionosphere over a wide geographical region. The bottomside ionosphere is not well characterized, because existing instrumentation is expensive, sparse, and usually views only a local region. Thus, a requirement exists for low-cost sensors that can provide information over an extended region. To address this problem we propose a feasibility/design study involving two types of HF instrument: (1) a receive-only sensor, that collects data from all known HF "transmitters of opportunity"; (2) a transmit/receive sensor that cycles over a range of frequencies. We will also study the feasibility of combining multiple instruments into a network, whose data can be ingested into appropriate ionospheric specification algorithms. This system will provide the capability to determine the dominant propagation mode for HF geolocation, a solution to the long-standing problem of HF geolocation, and improved security for the USA.

* Information listed above is at the time of submission. *

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