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.

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.

• 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.

• Bachelor’s degree in Electrical Engineering, Aerospace Engineering, Computer Science, Physics, Applied Mathematics, Telecommunications, or a related STEM field, or equivalent practical…