PNT Archives - Inside GNSS


November 5, 2019

Inertial Breakthroughs Guide the Autonomous Vehicle

The complex and mission-critical needs of the autonomous vehicle market demand innovation at higher levels in several different sensors and in sensor integration. A new photonic chip technology offers promise in providing high-volume, low-cost manufacture of high-end, tactical-grade performance fiber-optic gyros (FOGs)for inertial navigation in GNSS-obstructed environments.

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By Inside GNSS
October 22, 2019

Tech Search Emphasizes Smaller, Better IMUs, Timing Technology

IGM 20191021 Assured PNT MoGIS
C5ISR Center computer scientist Zach Kjellberg conducts testing on a position, navigation and testing system at Aberdeen Proving Ground, Md., on June 13, 2019.  Photo by Dan Lafontaine, C5ISR Center Public Affairs

The U.S. Army is reaching out to industry for the advanced inertial measurement unit (IMU) and timing technology it needs to support warfighters when GPS is unavailable or compromised. army officials are particularly interested in new algorithms, technology to shrink the size, cost and power requirements of highly capable timing devices and IMUs and ways to boost the capabilities of timing sources and IMUs crafted originally for less demanding commercial applications.

To better learn what might be available from private sector innovators the army is holding an Industry Day event October 29-30 in Huntsville, Alabama. Researchers in the army’s C5ISR Center at Aberdeen Proving Ground in Maryland have also   established a relationship with the Army Applications Lab (AAL) in Austin, Texas as another channel to help it connect with researchers, start-ups and other developers — including those whose technology may be able to cross over from unexpected places.

“The primary interest here is to understand what industry has done over the last several years in the area of IMUs and understand what’s the level of technology out there,” said Adam Schofield, the overall technical expert for position, navigation and timing (PNT) research at the C5ISR Center. C5ISR stands for Command, Control, Computers, Communications, Cyber, Intelligence, Surveillance and Reconnaissance. The Center is part of the Army’s Combat Capabilities Development Command.

Schofield said the Center is also looking for similar advances in timing devices to help equipment hold GPS-level time for as long as possible. “One of the things that the army is really trying to understand is what are the timing requirements for existing systems and then trying to understand — if we had better time, if we had really good clocks and really good time synchronization — what are some of the capabilities that we can now do that we couldn’t do without that good time?”

For example, Schofield said, the army has satellite and terrestrial radio communication networks “that all need to have some level of time synchronization in order for you to join the network and then, once I’m on the network, stay on the network.”

Being able to maintain really good time also helps warfighters thwart GPS spoofing by having something distinct and reliable to compare to incoming satnav signals. Time data from a really good, independent timing resource can be compared to the timing from GPS or other RF (radio frequency) signals to help determine if those signals are reliable.

‘It goes back to that assurance piece of how do I know what signals to trust,” said Schofield.

The timing accuracy needed to support army equipment depends on the application, said Schofield. The army is studying how to integrate atomic clocks and other options like using signals of opportunity from other sources — even sources as far flung as pulsars.

The key thing on the technology wish list, however, is better SWAP — that is squeezing down the size, weight and power needed by any IMU, clock  or other element in a military receiver.

“We always want it smaller, cheaper, less power, lower cost, especially if you’re talking for dismounted applications where SWAP is really critical,” said Schofield.

With IMU’s the army is taking a two-pronged approach to this, said Schofield. “How do I take existing lower performing sensors then, by design improvements, make them better performing? And then how do I take these larger quantum (atomic) and even FOG (fiber optic gyro) and RLG (ring laser gyro) type systems and maintain their really good performance but shrink them down in size.”

During the industry day event the Army will brief members of the commercial sector and hear invited presentations from those attendees who responded to the solicitation’s request for information. Those interested in participating in the industry event and perhaps giving a presentation on their technology must respond by Tuesday October 22. More information including a registration link  can be found online at Fed Biz Opps at under solicitations AFC_APNT_CFT_01 and AFC_APNT_CFT_2.

Once an intriguing technology is identified the Army is prepared to move with contracts based on OTA (other transactional authority) to fund work quickly, said Mike Caporellie, the team lead for the Modular GPS Independent Sensors project, which supports the army’s developing open standards architecture. Open standards will enable new technology to be more speedily integrated and updated.

“There’s been a big push with AFC (Army Futures Command) to expand the reach beyond traditional defense contractors,” said Schofield, “and that’s exactly what we’re trying to do here. If we have standard interfaces, anyone can develop an algorithm and plug into our architecture and we can use it. That’s the future we’re trying to enable to where anybody can provide an assured PNT capability.”

By Dee Ann Divis
September 11, 2019

GMV Spearheading GNSS Positioning Technology for Autonomous Vehicles

GMV has been chosen for development of advanced safe and precise positioning technology for a new generation of autonomous vehicles. Last week the Madrid, Spain-based company announced the award of an important contract for development of a precise satellite-based (GNSS) positioning system with integrity for the new generation of autonomous vehicles of the German carmaker BMW Group.

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By Inside GNSS
July 22, 2019

CASSCA, PNT for Unmanned Systems Slated for Sept. 16-17

The Institute of Navigation’s Cognizant Autonomous Systems for Safety Critical Applications (CASSCA) Conference will feature well-recognized experts and leaders from government, industry and academia. Originally scheduled as part of  ION’s International Technical Meeting (ITM) and Precise Time and Time Interval (PTTI) Systems and Applications in late January, CASSCA was postponed at that time due to an extended impasse between U.S. Congressional leaders and the White House that had created a partial U.S. government shutdown.

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By Inside GNSS
May 30, 2019

Air Force Lab Plans R&D into Celestial-Aided Navigation Tech

The Air Force Research Laboratory (AFRL) is considering a contract for research and development of celestial-aided navigation technologies. The primary focus is to develop a Star Tracker that can reliably perform celestial sightings for sensor altitudes between 30,000 feet and 80,000 feet. The goal is to reduce the risks to guidance, navigation and control in GPS-denied environments, especially for operations over feature-poor terrain such as desert, water, snow and ice where existing terrain-aided methods may not be used for position, navigation, and timing (PNT) updates.

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By Inside GNSS
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