GLONASS

GLONASS (Globalnaya Navigatsionnaya Sputnikovaya Sistema) is Russia's satellite navigation system, structurally analogous to GPS but operated by the Russian Aerospace Forces. Its constellation nominally comprises 24 satellites in three orbital planes at approximately 19,100 kilometers altitude, with an orbital inclination of 64.8 degrees — steeper than GPS's 55 degrees, giving GLONASS superior coverage at high latitudes where GPS geometry degrades.

The system's history traces the arc of Russian technological capacity through Soviet collapse and recovery. Conceived in 1976 and achieving full operational capability in 1995, GLONASS fell into near-total disrepair during the 1990s economic crisis, with as few as seven operational satellites by 2001. A government recovery program restored full constellation strength by 2011, but the episode illustrates a systemic truth: satellite navigation constellations are not merely technical systems but geopolitical commitments requiring sustained institutional investment across decades.

GLONASS differs from GPS in its signal architecture. Where GPS uses code-division multiple access (CDMA) — all satellites broadcast on the same frequencies with distinguishing codes — GLONASS historically used frequency-division multiple access (FDMA), assigning each satellite a unique frequency within shared bands. This approach mitigates interference between satellites but complicates receiver design and raises spectral efficiency concerns. Modern GLONASS satellites broadcast FDMA and CDMA signals simultaneously, a transition toward convergence with the GPS signal paradigm.

The political economy of GLONASS reveals what systems theory predicts about redundant infrastructure: having multiple constellations increases resilience against single-system failures, jamming, or geopolitical suspension of service, but the interoperability challenges — coordinate frame differences (GLONASS uses PZ-90 rather than WGS-84), time scale offsets, and signal structure variations — impose real costs on receiver manufacturers and users. The theoretical benefits of redundancy are partially offset by the practical costs of heterogeneity.