Resilient Positioning, Navigation and Timing (RPNT)

What is Resilient PNT?

Resilient positioning, navigation and timing (RPNT) is the convergence of positioning, navigation and timing technology with non-traditional and emerging technology to improve the reliability, performance and safety of mission-critical applications in the air, on land and in the sea. Resilient PNT solutions are used where even the smallest discrepancy in data accuracy, availability and stability can result in a mission failure, loss of life, or battlefield disadvantages, and significant economic loss.

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resilient GNSS diagram

Beyond the limitations of GPS

Although GPS and GNSS in general are the most established and primary PNT reference sources, they have well-known vulnerabilities and limitations that require protection and mitigation:

  • GPS and GNSS signals are easily disrupted by unintentional interference from radio transmitters
  • GPS and GNSS signals are extremely weak, cannot penetrate buildings and can easily be jammed
  • Civilian GPS and GNSS signals are not encrypted and can easily be spoofed

The world’s most critical applications rely on resilient positioning, navigation and timing

The need for PNT solutions with integrity and trust extends to commercial applications as well, to support critical homeland security and homeland infrastructure systems such as communications networks, financial systems and power grids. There is a global need, across all industries, for highly accurate positioning, navigation and timing data to improve the reliability, performance and safety of these critical, remote and often high-risk operations.

To ensure the highest levels of data integrity, the underlying PNT technologies, products and systems must be resilient.

What would happen without resilient PNT?

UAV with lost communication link
Ship with no rescue beacon
Family with scrambled TV signal
Driverless car without nav signal

Why Spectracom?

As PNT experts with a deep and rich history in critical timing and synchronization, Spectracom works aggressively to integrate assured positioning, navigation and timing technologies into all our products. Solutions to detect and mitigate interference are part of our core DNA.

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Our solutions include:

  • GPS and GNSS technology covering all satellite-based time and positioning signals including encrypted military SAASM and M-Code receivers, GPS, Galileo, GLONASS, IRNSS, and QZSS.
  • In-house time and frequency equipment manufacturing that include compact Rubidium standards and space-qualified Hydrogen Maser standards.
  • BroadShield jamming and spoofing detection systems that use over 75 proven detection algorithms to detect interference and spoofing within the GPS signal and GPS spectrum.
  • Alternative PNT signals and Signals of Opportunity receivers leveraging available signals such as eLORAN to increase the probability of maintaining accurate PNT information.
  • Vulnerability test systems that can evaluate the effects of interference, jamming and spoofing on systems that rely on GNSS signals.
  • Integration of various inertial sensors including MEMS-based and FOG-based sensors that offer a level of stand-alone performance in the absence of GPS references for position and navigation systems.
  • Hardened products that extend into harsh tactical operational environments and are resistant to cyber attacks.
  • Smarter use of the entire PNT ecosystem, including feature-rich GPS reception hardware and intelligent software techniques, reception from multiple constellations, multi-frequency signals, and augmentation systems.

Whenever safety, security and reliability are critical, Spectracom leads the way

Spectracom provides the Resilient PNT building blocks that are vital to mission critical applications. By integrating GNSS with proven existing technologies, we have created a comprehensive ecosystem of resilient PNT solutions trusted by thousands of customers. We improve the reliability, performance and safety of critical and remote operations to help customers secure, localize and navigate people or objects in challenging environments.

Resilient PNT Solutions
Resources

Application Notes

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The US global military GPS-GNSS devices market is expected to increase to $2.8 billion by 2027, and $25.7 billion globally. The result of all this growth has been equipment that is lighter, more capable, with faster processing and a small form factor, and low SWAP (Size, Weight, and Power).  This growth means specific challenges that the military must address to remain competitive. Applications needs zero failure, dual redundancy equipment that sustains and extends capabilities, in and out of denied environments.
pdf - 6 MB
Monday, December 4, 2017
By: Mike Sutton

Infographic

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Infographic sumarizes the features of STL as a GNSS alternative, or complementary, signal.  JPG version.
jpg - 2 MB
Wednesday, January 31, 2018
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Infographic sumarizes the features of STL as a GNSS alternative, or complementary, signal.  PDF version.
pdf - 187 KB
Wednesday, February 7, 2018

Brochures

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The VersaPNT combines a GNSS receiver, inertial measurement technology and high-performance timing oscillators to provide Assured PNT in GNSS-degraded and denied environments.
pdf - 521 KB
Monday, September 25, 2017

Datasheets

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BroadShield is an option that integrates over 75 GPS jamming and spoofing detection algorithms into the SecureSync Precision Time and Frequency Platform.


pdf - 14 MB
Friday, September 8, 2017
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STL is a new source for precision timing.  The Spectracom SecureSync configured with the new STL option card provides access to the Satelles Satellite Time and Location (STL) signal. By leveraging this alternative signal Spectracom time & frequency servers offer a unique solution for augmenting GPS and other GNSS signals for critical applications.
pdf - 2 MB
Wednesday, April 19, 2017
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The VersaPNT combines a GNSS receiver, inertial measurement technology and high-performance timing oscillators to provide Assured PNT in GNSS-degraded and denied environments.
pdf - 386 KB
Monday, August 20, 2018

System Diagrams

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A graphical representation of approaches to references for position, navigation and timing
pdf - 597 KB
Saturday, September 26, 2015
By: Spectracom

Other

pdf - 391 KB
Wednesday, April 12, 2017
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VersaPNT provides virtually failsafe battlefield navigation, even in GPS-denied environments, to protect critical networks with Assured PNT technology.
pdf - 339 KB
Monday, October 9, 2017
By: VersaPNT Press Release, October 9, 2017

Presentations and Articles

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Signals from Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS), are very weak and usually cannot be seen indoors or underground. A common method to overcome the problem of receiving GNSS signals indoors or underground is to use a GPS/GNSS repeater with an antenna located outdoors to receive the GNSS signals and an amplifier/antenna to re-transmit the signal indoors. This paper describes the technologies and methods for creating an intelligent repeater system including time synchronization at the nanosecond, microsecond, and millisecond levels, how each synchronization level affects the overall system and methods for achieving each, power level considerations including power level requirements between zones and how they affect transitions from one zone to another, data transfer and example system configurations. While GPS is primarily demonstrated and tested, the possibility for adding other GNSS constellations such as QZSS, BeiDou, Galileo, and GLONASS are also presented.
pdf - 270 KB
Wednesday, November 18, 2015
By: Lisa Perdue - Spectracom
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BroadShield for SecureSync is an interference detection suite that keeps your GPS/GNSS Synchronization safe from vulnerabilities caused by jamming and spoofing. Developed jointly by Spectracom and Talen-X, it is the only GPS-dependent PNT solution that protects critical infrastructure systems.
pdf - 2 MB
Friday, October 6, 2017
More Info

It has been a continuous trend that all aerospace and payload programs require more and more parameters to be measured during flight tests, at increasing sampling rates. Contextual data, associated with measurements – like timestamp, geolocation, attitude - are instrumental to performing a relevant analysis of measured data. Therefore flight test teams, in charge of engineering high speed measurement systems, need to ensure proper time alignment amongst all on-board systems, facing two challenges:

  • Distribute precise time (better than 1 μs), even in case of GPS loss, over the whole test mission duration
  • Distribute precise position and attitude, which are time-stamped consistently with the distributed time

In this paper, we demonstrate how a combined position & attitude measurement sensor and precise time server can meet all “Positioning, Navigation and Timing (PNT)” needs for a complex observation payload like an on-board test system and a SAR imagery radar, with benefits in terms of architecture simplification, and overall performance increase in terms of time and attitude accuracy. We also review the benefits of associating a high stability clock with a GPS receiver, in terms of improvement of some GPS reception performances.


pdf - 573 KB
Tuesday, June 9, 2015
By: Spectraccom
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This article was originally presented at the 2014 PTTI conference. It describes various approaches to a disciplining algorithm to detect and mitigate the effect of GNSS spoofing on precision time signals.


pdf - 914 KB
Monday, December 1, 2014
By: Spectracom
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Slides from the GPS World webinar “Defense PNT in Challenged Environments” hosted on June 21, 2018, and presented by Jon Fischer and Jon Sinden. This webinar discusses the reliance of GPS in modern land-warfare systems, the potential effects of GPS disruption on their operation and considerations for protecting their ability to continue operating in a GPS-disrupted environment. View the slides presented by Orolia or click here to register and watch the webinar on demand.


pdf - 663 KB
Wednesday, July 18, 2018

Success Stories

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A customer with a major datacenter facility was experiencing issues with GNSS interference affecting its timing systems.  This case study describes the solution, using a low-cost anti-jam antenna.
pdf - 743 KB
Friday, April 20, 2018
pdf - 2 MB
Wednesday, March 22, 2017

Technical Notes and Briefs

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Product Brief describing eLoran as a SecureSync timing reference.
pdf - 784 KB
Friday, July 15, 2016
By: Spectracom

White Papers

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Positioning, navigation and timing (PNT) services are indispensable, and providing trusted, resilient PNT solutions requires us to look beyond individual systems and methodologies to focus upon the user. An architecture that can meet this demand must include multiple systems with diverse technologies so that any single threat or source of disruption can be mitigated. This document discusses how signaling technologies such as GNSS, eLoran and STL are the complementary components of this architecture.
pdf - 583 KB
Wednesday, May 9, 2018
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Today's time sensitive networks rely on available and accurate positioning, navigation and timing (PNT) signals to provide leaders with the information required to make timely and effective decisions. The proliferation of GNSS-degrading and denying devices across state and non-state actors put this critical information capability in jeopardy. Learn how a combination of alternative PNT signals with traditional GNSS references makes PNT applications resilient against jamming and spoofing.
Offisite File
Friday, May 11, 2018
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Communications and intelligence-collection functions, traditionally associated with fixed sites and large platforms, are being pushed to tactical vehicles and sophisticated Unmanned Autonomous Vehicles (UAVs). This results in more C5ISR systems being installed on mobile platforms. Whether in the air, on land, or at sea, these vehicles will impart shocks and vibrations to their electronics, sometimes severely. In high vibration environments, the system designer must account for induced phase noise which can drastically affect overall performance. This white paper discusses the challenges of keeping low noise signals pure in any environment.
Offisite File
Wednesday, August 22, 2018
More Info
This white paper discusses alternative signals that are suitable for low size, weight, and power (SWAP) assured PNT devices.
Offisite File
Friday, October 20, 2017