Gravity_Meter_SOW_FY26.docx
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This Statement of Work (SOW) details the National Geospatial-Intelligence Agency's (NGA) requirements for purchasing dynamic gravity meters for airborne and marine geophysical survey applications. The agency seeks gravity meters with specific technical specifications, including a minimum range of 20,000 mGals, drift not exceeding 3 mGals/month, and system performance resolution of at least 0.01 mGals. The procurement includes five rugged laptops with proprietary software, and requires the contractor to provide a comprehensive owners/operator manual and three days of training per meter.
The contract has a 5-year performance period with an estimated three meters to be delivered annually, consisting of a mix of marine and airborne gravity meters. Key deliverables include fully functional gravity meter systems with control system computers, perpetual software licenses, spare parts, and a two-year parts and labor warranty. The meters must meet strict dimensional and environmental requirements, with operating temperatures between 5°C to 50°C, and must be designed to function in small aircraft and marine vessels. The ultimate goal is to support NGA's Earth Gravitational Model by collecting gravity survey data through a meter loan program for academia, government agencies, and private companies.
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DYNAMIC GRAVITY METER PURCHASE FOR THE OFFICE OF GEOMATICS
Statement of Work (SOW)
May 1, 2025
Contents
| 1 | Background and Scope | 3 |
| 2 | Requirements | 3 |
| 3 | Specifications | 3 |
| 4 | Training | 5 |
| 5 | Gravity Meter Delivery | 5 |
| 6 | Deliverables | 6 |
| 7 | Travel | 6 |
| 8 | Security | 6 |
| 9 | Quality Assurance | 6 |
| 10 | Invoicing | 7 |
| 11 | Period of Performance | 7 |
| 12 | Contracting Officer Representative (COR) | 7 |
UNCLASSIFIED
~ 4 ~
UNCLASSIFIED
Background and Scope The National Geospatial-Intelligence Agency (NGA) delivers Geospatial Intelligence (GEOINT) information that provides a decisive advantage to policymakers, warfighters, intelligence professionals, humanitarian efforts and first responders. NGA supports the National System for Geospatial Intelligence (NSG), which supports our Department of Defense (DoD), Department of Homeland Security and the Intelligence Community. NGA leads the world in timely, relevant, accurate and actionable GEOINT.
NGA also creates the Earth Gravitational Model for use in navigation products for the DOD and general use for industry and academia. The Earth Gravitational Model contains gravity survey data from all over the world. Acquiring more gravity survey data improves this model. The gravity meter loan program is a source of this gravity data for NGA. NGA loans gravity meters to academia, government agencies, and private companies in exchange for the gravity data they collect. NGA is looking to update their gravity meter inventory with new, ITAR restriction-free gravity meters. NGA is therefore seeking a company that is capable of manufacturing and servicing airborne and marine gravity collection systems for use in small-type aircraft and marine vessels respectively to perform geophysical surveys to collect the magnitude of the earth’s gravity field for global and regional gravity models.
Requirements The contractor shall build and deliver Marine and Airborne based dynamic gravity meters meeting NGA technical requirements. The contractor shall provide a complete owners/operator manual of the gravity meter system with the first delivery, this is to include an SOP (standard operating procedure or “how to”) of gravity data processing with the meters and any associated/proprietary software. The contactor shall also provide 3 days of training for each meter purchased.
Specifications The following are the minimum technical specifications:
| Airborne |
| Marine |
| Sensor Type |
| Full-feedback Zero Length Spring |
| Full-feedback Zero Length Spring |
| Range |
| Worldwide capability |
Minimum: 20,000 mGals without reset Worldwide capability Minimum: 20,000 mGals without reset
| Drift |
| Not more than 3 mGals/month |
| Not more than 3 mGals/month |
| External Sensor Power Pack (to maintain ‘out-of-gimbal’ power) |
| Required |
| Required |
| Maximum time to operational temperature stability |
| 24 hours |
| 24 hours |
Platform
| Gimbal Pitch |
| Minimum 30° |
| Minimum 30° |
| Gimbal Roll |
| Minimum 30° |
| Minimum 30° |
| Gimbal Lock |
| Required: Manual |
Optional: System controlled Required: Manual Optional: System controlled
Control System
| Computer |
| 2 PCs or Tablets, a primary and a back up |
| 2 PCs or Tablets, a primary and a back up |
| Software License |
| Perpetual, included |
| Perpetual, included |
| Software Modes |
| Calibration, Collection, Replay |
| Calibration, Collection, Replay |
| Data Format |
| Raw ASCII |
| Raw ASCII |
| Output processed value |
| Full field gravity (inclusive of gravity meter and geophysical corrections) |
| Full field gravity (inclusive of gravity meter and geophysical corrections) |
| Data Recording Frequency |
| Minimum: 10Hz |
| Minimum: 1Hz |
| Secondary Raw Data Recording |
| Independent of Computer |
| Independent of Computer |
| GPS and/or INS Equipment |
| Included with gravity meter |
| N/A |
System Performance
| Resolution |
| Minimum: 0.01 mGals |
| Minimum: 0.01 mGals |
| Repeatability (Static) |
| 0.05 mGals |
| 0.05 mGals |
| Repeatability (Dynamic) |
| 0.25 mGals @ 50,000 mGals horizontal |
| 0.25 mGals @ 50,000 mGals horizontal |
| Accuracy |
| Minimum: 0.7 mGals |
| Minimum: 0.7 mGals |
| Turn Recovery Time |
| 3 minutes |
| 3 minutes |
Design
| Power Requirements |
| Nominal: 70 Watts |
Maximum: 250 Watts Input: 80-265 VAC, 50/60Hz Input: 20-32 VDC Nominal: 70 Watts Maximum: 250 Watts Input: 80-265 VAC, 50/60Hz Input: 20-32 VDC
| Weight |
| Functional System, not to exceed: 200lbs. UPS: Not to exceed 75lbs |
| Functional System, not to exceed: 200lbs. UPS: Not to exceed 75lbs |
| Dimensions |
| System must pass through typical sized aircraft doors and fit inside geophysical surveying aircraft without frame disassembly (e.g. Cessna Caravan). Dimensions of the gravity meter shall not exceed: 28(l) x 22(w) x 33(h) inches |
| System must pass through typical sized geophysical survey ship hatch doors without frame disassembly. Dimensions of the gravity meter shall not exceed: 28(l) x 22(w) x 33(h) inches |
| Mounting Plate |
| Airplane mounting plate |
| Marine mounting plate |
| Operating Temperature |
| 5°C to 50°C |
| 5°C to 50°C |
| Storage Temperature |
| -10°C to 50°C |
| -10°C to 50°C |
Spare parts
| Spare parts |
| Spare power module |
Spare system control unit Air dampers (2) Spare suspension bungees (4) Spare air cushion mounts (8) Spare Control System Laptop Hardware (nuts, bolts, fasteners) Spare power module Spare system control unit Air dampers (2) Spare suspension bungees (4) Spare air cushion mounts (8) Spare Control System Laptop Hardware (nuts, bolts, fasteners)
Customer Service
| Warranty |
| 2 Year Parts and Labor |
| 2 Year Parts and Labor |
0. Preference is for major components (e.g. Sensor, Electronic packages, Control Systems, Software) to be interchangeable between the same type of platform (e.g. airborne to airborne) and across different platforms (e.g. airborne to marine, marine to airborne) with minimal setup and adjustments by users.
0. Provide a minimum of 5 windows based rugged (durable computer designed to withstand marine and airborne environmental conditions and rough handling) laptops. Laptops will contain software and licenses of the contractor’s collection and processing software and any proprietary scripts or data processing software produced by the contractor. These laptops are in addition to the 2 control system laptops/tablets provided with each meter.
Training The purchase of each gravity meter shall include three days of training. The first training session for the first marine gravity meter and first airborne gravity meter shall include but is not limited to the following:
| • | Gravity meter unpacking and assembly procedure |
| • | Component inspection |
| • | Component replacement |
| • | Gravity meter installation procedure |
| • | System power on procedure |
| • | Gravity meter storage |
| • | Gravity meter shipment |
| • | Overview of data acquisition software and operation procedure |
The contractor shall not repeat the material and training from previous sessions. After the initial training for each meter additional training topics and dates shall be agreed upon by both the contractor and NGA. Additional topics may include assisting NGA’s Meter Loan Program participants with installing the gravity meter on survey aircraft or vessel. Training may occur at NGA, the contractor’s facility, or at facilities housing survey aircraft and vessel where the meters will be installed. Any unused training time shall not expire.
Gravity Meter Delivery The contractor shall ship the gravity meters to the following address:
National Geospatial-Intelligence Agency Office of Geomatics Mail Stop: L-41 c/o Alicia Metzger 3838 Vogel Road Arnold, MO 63010-6238 The contractor shall ship all meters for each order at the same time and provide email notification of delivery shipment to the Contracting Officer Representative (COR)
Deliverables
| SOW Paragraph and Requirement |
| Performance |
Standards
| Acceptable Quality Levels |
| Surveillance Method |
| Surveillance Frequency |
| SOW 2, 3 Gravity Meters |
| Delivery of gravity meters meeting technical requirements in section 3, including 2 control system laptops/tablets per meter |
| 100% |
| Physical inspection of meters |
| Upon delivery |
| SOW 3.3 Rugged Laptops |
| Delivery of the 5 additional rugged laptops with software and licenses |
| 100% |
| Physical inspection of laptops |
| Upon delivery of first order |
| SOW 2, Manuals |
| Delivery of the owners/operator manual of the gravity meter system |
| 100% |
| Visual Inspection |
| Upon initial delivery of each meter type (Marine and Airborne) |
| SOW 2, 4 Training |
| Three days of training per purchased meter |
| 100% |
| Completion of Training |
| Upon agreement between contactor and NGA |
Travel Should travel to government/military installations be required to provided hands-on training to install the gravity meters on survey aircraft and vessels, access to these facilities will be coordinated between the contractor, NGA, and installation POC.
Security This work is unclassified, uncleared contractor personnel are authorized to work on this contract.
Uncleared contractor personnel visiting NGA facilities or other sites may receive the appropriate visitor badge and be escorted, as appropriate. The vendor will return the visitor badge at the end of each visit day.
Quality Assurance The vendor is responsible for product/service quality as it pertains to all requirements under this SOW. The vendor shall take all steps necessary to ensure that the content meets all quality and specification aspects required by NGA.
Invoicing The vendor shall submit invoices to NGA after each delivery.
Period of Performance The overall PoP inclusive of options is 5 years (60 months), comprising of two (4) Option Years.
The contractor shall construct and deliver an estimated three meters to NGA per year (5 years total). Orders will be a mix of marine and airborne gravity meters; NGA will determine which type is required.
Contracting Officer Representative (COR) Dee Hill 314-676-1694 Delores.M.Hill@nga.mil image1.png
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