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RAP opportunity at Air Force Science and Technology Fellowship Program     AF STFP

Ultra-Reliable-Low-Latency Forward Error Correction for Next Generation GNSS


Space Vehicles Directorate, RV/Space and Planetary Sciences

opportunity location
13.40.01.B7444 Kirtland Air Force Base, NM 871175776


name email phone
Khanh Dai Pham 505.846.4823


The intent of this research opportunity is to incorporate resilient and flexible forward error correction (FEC) techniques into next generation Global Navigation Satellite Systems (GNSS) for ultra-reliable low-latency GNSS-enabled PNT information, which enhances real-time situational awareness for command and control, synchronizes communications, and enables the accuracy and efficiency of DoD capabilities at every point in a time-critical kill chain, all of which work together to field a lethal, resilient, and highly adaptable Joint Force. GNSS-enabled PNT service will be determined to be ultra-reliable and low latency compliant if it continues to provide reliable PNT information over the time period required by a specific mission at certain levels of timeliness and accuracy required by the time-critical mission in the contested physical, electromagnetic, and cyber environment.

 While Low-Density Parity-Check (LDPC), convolutional codes and the likes will remain the cornerstone FEC capability for GNSS-enabled PNT services, theoretical performance limits of such finite-length coded schemes have not been explored at all. Therefore, it is not clear how effective and efficient the existing FEC designs are in terms of near-capacity performance, time to first fix, bit-level error correction, packet-level erasure protection, and urban multi-path fading environments. Of the various components within this tech need, the development is needed in: i) Diverse navigation data structures, including evolving short and very short block lengths; ii) Low latency FEC codes having flexible code rates and lengths, pre/post bit error rates, operations per bit; iii) Information-theoretical limits for overlaying short and very-short FEC codes onto existing families of satellite spreading codes and navigation modulations; and iv) Fast and scalable signal processing techniques subject to size, weight, and power requirements.


1. T.-K. Le, U. Salim, and F. Kaltenberger, “An Overview of Physical Layer Design for Ultra- Reliable Low-Latency Communications in 3GPP Releases 15, 16, and 17,” IEEE Access, vol. 9, pp. 433–444, 2021.

2. Congress, “Spectrum Interference Issues: Ligado, the L-Band, and GPS,” Congressional Research Service. Available online at, 2020.


key words
Forward error correction; ultra-reliable low-latency GNSS; flexible code rates; scalable signal processing; information-theoretic limits


Citizenship:  Open to U.S. citizens
Level:  Open to Postdoctoral and Senior applicants


Base Stipend Travel Allotment Supplementation
$95,000.00 $5,000.00

Experience Supplement:
Postdoctoral and Senior Associates will receive an appropriately higher stipend based on the number of years of experience past their PhD.

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