Edge Microwave examines the modulation methods that underpin modern Global Navigation Satellite Systems (GNSS) in A Primer on GNSS Signal Modulations.
The article outlines how precise navigation and timing depend on decades of waveform engineering, from the foundational BPSK-DSSS format to advanced hybrid structures such as AltBOC, each designed to enhance accuracy, interference resilience, and spectral efficiency.
The overview details how Direct-Sequence Spread Spectrum (DSSS) allows multiple satellites to operate within the same RF band without interference. It also highlights modulation schemes such as Binary Offset Carrier (BOC) and its related designs, CBOC and TMBOC, which use sub-carrier shaping to improve robustness and spectral control. AltBOC extends these principles into a hybrid, constant-envelope waveform that delivers high ranging precision and strong resistance to interference. Together, these refinements support improved signal integrity across defense, aviation, and autonomous system applications.
Edge Microwave provides insight into how GNSS waveform design has progressed to balance performance, reliability, and spectrum efficiency. Edge Microwave’s analysis traces the evolution from early signal formats to advanced implementations that form the foundation of today’s resilient navigation infrastructure.
Read the full article, A Primer on GNSS Signal Modulations, to explore the underlying concepts in greater depth.
