Novel Diagnostic Methods for At-Sea Testing of Inertial Navigation System Avionics
Develop new diagnostic methods for Embedded Global Positioning/Inertial
Navigation System (EGI/INS) and Inertial Measurement Unit (IMU) avionics that
minimize support equipment footprint and complexity, while overcoming challenges
of at-sea testing, to perform at or above desired fault detection/fault
At-sea tests of EGI/INS and IMU avionics (e.g., AN/ASN-139 CAINS (Carrier
Aircraft Inertial Navigation System) II EGI, ASQ-228 ATFLIR (Advanced Targeting
Forward Looking Infrared) IMU, NGC (Northrop Grumman Corporation) LN-200) pose
a unique challenge in the support equipment community. The units under test
(UUTs) perform inertial sensing and geolocation functions, yet their function
must be verified in an environment subject to ship motion and without access to
Current and proposed methods for at-sea tests of EGI/IMU present several
- High costs of sustainment for inertial reference units (IRU) equipment
(incurred cost of $1.33M for 14 IRU repairs over past seven years)
- Large footprint of rate table equipment (up to 40”x40” footprint and
500-pound weight) in space-limited workshops
- Numerous fiber optic interfaces requiring additional troubleshooting and
- Long test performance times that may exceed the Navy’s objective of 60
minutes for verification of a unit under test
An innovative solution is sought to replace the Navy’s Inertial Device Test Set
(IDTS), a test equipment product used to diagnose and verify the operation of
EGI avionics. The Navy’s IDTS currently performs the following functional
tests: Alignment; True Heading; Pitch; Roll; Velocity; Latitude; Longitude;
Altitude; and Navigation Drift.
The above tests are provided as a reference. In the process of developing new
test methodology, some, all, or none of these tests may be utilized. The end
goal for an innovative solution should be to improve upon the challenge factors
listed earlier, while meeting the Navy’s requirements for diagnostic accuracy:
1) Percent Correct Detection (PCD):
Definition: [(Number of correct detections * 100)/Total number of confirmed
2) Percent Correct Fault Isolation (PCFI):
Definition: [(Number of correct fault isolations * 100)/Total number of correct
95% (for ambiguity group of <= 3 Shop Replaceable Assembly (SRAs))
93% (for ambiguity group of <= 2 SRAs)
90% (for ambiguity group of 1 SRA)
70% (for ambiguity group of <= 3 SRAs)
68% (for ambiguity group of <= 2 SRAs)
65% (for ambiguity group of 1 SRA)
Solution must be able to achieve such diagnostic coverage that INS avionics
could be deemed "Ready for Issue" (RFI) following successful test.
The above diagnostic accuracy requirements are currently met by the Navy's
IDTS, in conjunction with the Consolidated Automated Support System (CASS)
family of testers. Solutions may also operate in conjunction with CASS, but are
not limited to this design approach.
I: Determine EGI/IMU failure modes and test requirements utilizing past IDTS
requirements analysis documentation and UUT test strategy reports, which will
be made available to Phase I awardees. Develop a proof of concept for
diagnostic techniques and perform a feasibility demonstration of test methods
on EGI/INS and IMU components and/or sub-assemblies. Define an initial concept
for integration method with CASS, if applicable to design approach. The Phase I
effort will include prototype plans to be developed under Phase II.
II: Develop prototype test equipment capable of performing test method
validation on full EGI/INS and IMU avionics assemblies. If pertinent to design
approach, demonstrate integration with a CASS family tester at Joint Base
McGuire Dix Lakehurst, NJ. (Note: Access to CASS equipment at Navy facility in
support of SBIR activity will have no associated cost beyond contractor’s own
travel expenses.) Develop concept definition for packaging and mechanical
design, accounting for environmental and electromagnetic effects requirements
in Navy I-level afloat maintenance shops [Ref 5] (MIL-STD-461 for Navy surface
ships, below deck equipment, using test methods CE101, CE102, CS101, CS106,
CS114, CS116, RE101, RE102, RS101, and RS103).
III DUAL USE APPLICATIONS: Transition program for use in Navy I-level
maintenance, integrating with all variants of the CASS Family of Testers,
followed by regression testing of all existing IDTS Test Program Sets (TPS).
TPS code comprises the test instructions executed on CASS to direct the test
and measurement instrumentation. During technology transition, any new inertial
device test technology must demonstrate ability to accept CASS commands, as
generated by current Navy TPS code. Upon completion, the new SBIR-developed
technology would be fielded in place of the existing IDTS CASS ancillary
EGIs and IMUs found within Navy air platform weapon systems are often COTS
avionics used in other systems across DoD and commercial aviation (e.g.,
commercial passenger airlines) and transportation industries (e.g., commercial
shipping, trucking, and air freight transportation). EGI/INS and IMU equipment
is commonly used to aid navigation on ships, aircraft, submarines, guided
missiles, and spacecraft. Novel test techniques for Navy EGI/IMU avionics may
enable improvements in EGI/IMU maintenance across the range of commercial
aviation and transportation industries that rely on similar equipment.
Inertial Device Test Set (IDTS) RFI for second generation system, Solicitation
Number: N68335-17-R-0033. https://www.fbo.gov/index?s=opportunity&mode=form&id=c9cea2bbb2dd81429b298f1a99f2e74f&tab=core&_cview=1
Sole source justification document for solicitation leading to acquisition of
Navy's current EGI test equipment, Inertial Device Test Set (IDTS). https://www.neco.navy.mil/synopsis_file/N68335-10-C-0236_IDTS%20J&A%20for%20FEDBIZOPPS1.pdf
Smalling, K. and Eure, K. “A Short Tutorial on Inertial Navigation System and
Global Positioning System Integration.” NASA Langley Research Center: Hampton,
VA, 2015. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20150018921.pdf
Renfroe, P.B. et al. “Test and Evaluation of the Rockwell Collins GNP-10 for
the Precision Kill and Targeting (PKAT) Missile System.” IEEE 2000, Position
Location and Navigation Symposium: San Diego, CA, USA, 2000, pp. 488-493. https://ieeexplore.ieee.org/document/838343/
MIL-STD-461G Requirements for the Control of Electromagnetic Interference
Characteristics of Subsystems and Equipment. http://quicksearch.dla.mil/qsDocDetails.aspx?ident_number=35789
Support Equipment; Avionics Test; Automatic Test Equipment; Automated Test
Systems; Inertial Test; GPS Test
** TOPIC NOTICE **
These Navy Topics are part of the overall DoD 2019.1 SBIR BAA. The DoD issued its 2019.1 BAA SBIR pre-release on November 28, 2018, which opens to receive proposals on January 8, 2019, and closes February 6, 2019 at 8:00 PM ET.
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