{"id":433,"date":"2026-08-18T06:44:08","date_gmt":"2026-08-18T06:44:08","guid":{"rendered":"https:\/\/navshieldglobal.com\/?p=433"},"modified":"2026-08-18T06:59:25","modified_gmt":"2026-08-18T06:59:25","slug":"gnss-frequency-bands-explained","status":"publish","type":"post","link":"https:\/\/navshieldglobal.com\/fr\/gnss-frequency-bands-explained\/","title":{"rendered":"Explication des bandes de fr\u00e9quences GNSS : GPS L1\/L2\/L5, Galileo E5a\/E5b, BeiDou B1C\/B2a\/B3I et GLONASS CDMA L3"},"content":{"rendered":"

Par le Dr Helena Voss, ing\u00e9nieure principale en radiofr\u00e9quences chez NavShield Global (15 ans d\u2019exp\u00e9rience dans la protection PNT et la conception d\u2019antennes adaptatives). R\u00e9vision technique par l\u2019\u00e9quipe RF de NavShield.<\/em><\/p>\n\n\n\n

Here’s the thing about picking a GNSS antenna\u2014if you don’t check which bands it actually supports, you’re basically flying blind the moment someone turns on a jammer. Because a jammer doesn’t have to hit every frequency. It just needs to hit the one your antenna doesn’t cover.<\/p>\n\n\n\n

This guide maps every major civil GNSS frequency band<\/strong>\u2014GPS L1\/L2\/L5, Galileo E5a\/E5b, BeiDou B1C\/B2a\/B3I, and GLONASS G1\/G2 plus the modern CDMA L3\u2014and shows why your multi-band CRPA anti-jamming antenna must cover the exact bands your receiver tracks, especially against cross-band composite jamming. Browse the matching hardware on our CRPA antenna product page<\/a>.<\/p>\n\n\n\n

Once you know which bands matter for your setup, head over to our CRPA antenna product page to find the hardware that actually covers them.<\/p>\n\n\n\n

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Why Band Coverage Decides CRPA Survivability<\/h2>\n\n\n\n

Your Bandes de fr\u00e9quences GNSS<\/strong> strategy should be driven by the jamming environment, not by marketing specs. Most buyers ask \u201chow many elements<\/mark>?\u201d before asking \u201cwhich bands?\u201d That order is backwards\u2014a nulling antenna can only protect the signals it actually receives.<\/p>\n\n\n\n

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Antennes anti-brouillage<\/em><\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

Frequency Diversity Is Not Spatial Nulling<\/h3>\n\n\n\n

A multi-band GNSS receiver<\/strong> using GPS + Galileo gains frequency diversity: two independent measurements of the same position. But diversity alone does not<\/em> defeat interference. Under broadband or swept jamming, every band can be overwhelmed at once, and the receiver still loses lock.<\/p>\n\n\n\n

The real defense is spatial adaptive nulling<\/a>: the antenna array estimates the interference direction and steers a deep null toward it in the spatial<\/em> domain, physically suppressing the jammer while preserving satellite signals from other angles.<\/p>\n\n\n\n

Single-Band vs. Multi-Band CRPA<\/h3>\n\n\n\n

This is the point procurement teams miss. An L1-only CRPA nulls interference on L1, but a jammer that also covers the receiver\u2019s Galileo E5a or BeiDou B2a channel still blanks those signals.<\/p>\n\n\n\n