This document discusses the impact of GLONASS on GNSS receiver design compared to GPS. It notes that GLONASS uses frequency division multiple access (FDMA) rather than the code division multiple access (CDMA) used by GPS, requiring receivers to handle multiple frequencies. This affects the RF design, satellite acquisition, tracking algorithms, and positioning calculations. It also discusses issues like inter-receiver compatibility. Overall, GLONASS provides benefits like increased availability but requires more advanced designs to handle the technical challenges of its FDMA approach.