Specialist, Systems Engineer - Software Defined Radio

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do. L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security. Job Title: Specialist, Systems Engineer – Software Defined Radio Job Code: 44308 Job Location: Yorba Linda, CA Schedule: 4/10: Employees work 10 hour days, 4 days a week   Job Description:     Navigation Solutions delivers advanced military GPS and broader Position, Navigation, and Timing (PNT) capabilities that support mission requirements across weapon systems, ground platforms, airborne assets, maritime systems, and space environments. The engineer will collaborate closely with cross‑functional teams to ensure these systems meet performance, reliability, and integration requirements across all operational domains.   A key responsibility of this role is field testing GPS receivers in contested and threat‑representative environments. This includes planning, executing, and analyzing tests that assess receiver performance under conditions such as jamming, spoofing, intentional interference, and degraded‑signal scenarios. The engineer will validate real‑world robustness, characterize system behavior under mission-relevant stressors, and ensure compliance with stringent military performance standards. These field activities require travel and coordination with external test ranges, customers, and mission partners.   Navigation Solutions products are engineered to provide resilient PNT performance for the warfighter operating in denied or degraded environments. This role directly ensures that GPS receivers and simulators maintain mission effectiveness when exposed to adversarial threats and operational challenges.     Essential Functions:   Integrate, configure, and validate software defined radio (SDR) architectures used across all GPS simulators, ensuring accurate signal generation, modulation, and timing performance. Develop and execute RF test methodologies tailored to SDR-based systems, including waveform verification, calibration procedures, and over-the-air (OTA) characterization. Implement and maintain FPGA- and DSP based signal processing chains that support GPS, GNSS, and custom PNT waveforms within SDR platforms. Troubleshoot SDR hardware/software interactions, including RF front-end behavior, digital interface control, and embedded firmware issues affecting simulator performance. Create automated test scripts and diagnostic tools to evaluate SDR output fidelity, dynamic range, phase noise, and interference resilience.  Collaborate with system architects and RF engineers to define SDR integration requirements for next generation GPS simulators and PNT solutions. Support STE development for SDR-based systems, ensuring compatibility with high-speed digital interfaces, RF switching networks, and precision timing sources. Perform detailed data analysis on SDR-generated signals to confirm compliance with system specifications, military GPS standards, and program requirements. Participate in acceptance testing and configuration management of SDR firmware loads, FPGA bitstreams, and associated calibration files.

Bachelor's Degree in Science, Technology, Engineering, or Mathematics (STEM) or related discipline with minimum 4 years prior relevant experience, 2-year post-secondary/AA Degree and 8 years prior experience, or Graduate Degree with 2 years of prior