Navigation Engineer (PNT Signal-in-Space)

Navigation Engineer (PNT Signal-in-Space) About Logos Space Logos Space is building a proliferated Low Earth Orbit (pLEO) constellation to deliver resilient, high-performance connectivity to enterprise and government users worldwide. As part of that effort, the Navigation team is designing and building the software and infrastructure for spacecraft timing, astrodynamics, maneuver planning, orbit determination, and related navigation workflows used across flight and ground systems. Position Summary The Navigation team at Logos Space is building the capabilities required to generate, transmit, and validate PNT signals from our LEO spacecraft. This role focuses on the space-side definition, generation, and verification of the PNT signal-in-space, including PRN/spreading-code structure, navigation message content, onboard signal-generation behavior, timing relationships, and the interfaces required to broadcast a correct and usable navigation signal. In this role, you will help define and implement the signal that our satellites generate and transmit. Depending on level, you will contribute to or independently own well-scoped portions of the signal-in-space stack, such as PRN/code design and assignment, navigation message structure, signal timing, modulation definition, payload signal-generation interfaces, Signal-in-Space ICD development, conformance testing, or verification against payload and system requirements. We are looking for engineers who can work well in a fast-paced environment, turn incomplete requirements into practical signal definitions and implementation plans, and collaborate closely with adjacent teams across navigation, payload, flight software, timing, RF, security, ground systems, and receiver validation. Responsibilities Define navigation message content and structure, including ephemeris, clock, constellation status, satellite health, service status, integrity, authentication-related fields, and other broadcast data needed to support PNT users. Develop and maintain the Signal-in-Space Interface Control Document, including signal definitions, navigation message content, field semantics, timing behavior, implementation notes, change control, receiver-facing interpretation, and requirements traceability. Support the development and maintenance of the PNT signal-in-space specification for a LEO constellation, including PRN/spreading-code structure, data and pilot channel structure, symbol timing, navigation message framing, coding, synchronization, and signal timing relationships. Evaluate PRN and spreading-code families for autocorrelation, cross-correlation, constellation scalability, acquisition behavior, data/pilot separation, and robustness to navigation data transitions. Work with the modem, payload, RF, FPGA, and flight software teams to define clean interfaces for onboard PNT signal generation, including timing inputs, navigation data inputs, payload control inputs, signal configuration inputs, and health/status outputs. Support definition of frequency plans, bandwidth, modulation, coding, message data structure, power allocation, link budget, spectral containment, and signal compatibility trades. Build analysis and simulation tools to generate representative baseband/IQ signals, validate navigation message structure, analyze signal performance, and support payload and receiver-facing verification. Develop conformance tests and golden-reference data products to verify that flight, payload, simulator, and test implementations match the Signal-in-Space ICD. Work closely with state estimation, astrodynamics, timing, payload, RF, flight software, security, ground software, and mission operations engineers to ensure the transmitted PNT signal is correct, verifiable, and operationally supportable. Support integrated test campaigns, payload verification, software-in-the-loop testing, hardware-in-the-loop testing, commissioning, flight-data investigations, and anomaly response as needed. Basic Qualifications Bachelor’s degree in Electrical Engineering, Aerospace Engineering, Computer Science, Physics, Applied Mathematics, Telecommunications, or a related STEM field, or equivalent practical experience. 5+ years of relevant professional experience in GNSS, PNT, spread-spectrum communications, satellite communications, navigation payloads, SDR, digital signal processing, RF systems, or similar signal-generation or signal-definition work. Strong graduate research or project experience may substitute for some professional experience. Working knowledge of GNSS or GNSS-like signal structures, including PRN/spreading codes, CDMA or DSSS techniques, modulation, navigation data, pilot/data channel structure, acquisition considerations, tracking considerations, and message synchronization. Experience defining, implementing, testing, or validating digital signal-generation or signal-processing algorithms. Familiarity with navigation message concepts such as ephemeris, clock, time systems, satellite health, service status, almanac or constellation data, integrity fields, message framing, CRCs, FEC, interleaving, or authentication-related fields. Ability to read, write, and maintain rigorous technical specifications or ICD-style documents. Working knowledge of timing systems, reference frames, orbital mechanics, or how navigation data products interface with signal generation and user navigation. Experience building test vectors, simulation tools, analysis scripts, regression tests, or golden-reference implementations. Experience with Linux-based development environments, Git, and automated testing. Strong written and verbal communication skills. Preferred Qualifications 8+ years of relevant experience and the ability to independently own technical workstreams. Master’s or PhD in Engineering, Math, Physics, or a related field with specialization in GNSS, PNT, signal processing, communications, navigation payloads, or satellite systems. Experience with LEO PNT, LEO satellite communications, high-Doppler signal environments, spaceborne navigation payloads, or GNSS augmentation systems. Experience designing or analyzing PRN/spreading-code families, pilot/data structures, signal acquisition behavior, or code/carrier tracking implications. Experience with public GNSS signal specifications or ICDs such as GPS, Galileo, BeiDou, or related navigation signal standards. Experience with signal-in-space requirements, payload requirements, requirements traceability, design control, interface control, or change-control workflows. Experience with navigation signal authentication, navigation message authentication, anti-spoofing, cryptographic field allocation, or secure signal design. Experience with RF/baseband signal-generation chains, SDR-based testbeds, GNSS simulators, RFSoCs, FPGA-based signal generation, or hardware-in-the-loop validation. Experience defining payload interfaces for timing, navigation data upload, signal configuration, mode control, telemetry, health monitoring, or onboard signal-generation behavior. Experience supporting integrated payload test, satellite commissioning, RF testing, mission operations, or anomaly investigation. Ability and willingness to obtain and maintain a U.S. Government Security Clearance. Even if you don’t meet every qualification, we encourage you to apply. We value strong fundamentals, sound judgment, and growth potential, and we know great candidates do not always match every item on a job description. Additional Information Logos Space is an equal opportunity employer and values creativity, curiosity, and diverse perspectives. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, marital status, or any other status protected by applicable law. Employment offers are contingent on the candidate’s ability to access export-controlled information in accordance with U.S. law.