Why is "Secondary surveillance radar" trending?
Latest news, Wikipedia summary, and trend analysis.
Trend Analysis
- Ranking position: #
- Date: 2026-06-11 11:47:02
This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
Based on Wikipedia pageviews and search interest, this topic gained significant attention on the selected date.
Trend Insight
Secondary_surveillance_radar entered the ranking for the first time today at position #. This is its highest position ever recorded.
Trend History
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-11 and was most recently seen on 2026-06-11.
Wikipedia Overview
Secondary surveillance radar (SSR) is a radar system used in air traffic control (ATC) that, unlike Primary Surveillance Radar (PSR) systems that measure the bearing and distance of targets using the detected reflections of radio signals, relies on targets equipped with a radar transponder, that reply the Mode that an interrogation pulse code corresponds to, by transmitting a pulse telegram containing, e.g. the identity code as 4 digit octal number in Mode A, the aircraft's altitude from the barometric pressure sensor of an aircraft in Mode C and a unique 24-bit address and further information in other Modes. SSR is based on the military Identification Friend or Foe (IFF) initially standardized in the U.S. and later adopted by NATO ; however, the first IFF systems date back to World War II. SSR Mode A, C and S are compatible with IFF Mode 3A, C and S. SSR Mode B and D are not specified in ICAO Annex 10 any more for use today. Additional SSR Mode S based systems are ADS-B, TCAS, Multilateration Systems (MLAT) and satellite based surveillance using ADS-B messages.
Read more on Wikipedia →Related Topics
- Primary radar
- Aviation transponder interrogation modes
- ADS-B
- ARINC
- Aeronautical earth station
- Aeronautical station
- Air traffic control
- Air traffic control radar beacon system
- Aircraft earth station
- Aircraft station
Trending Topic Today
Search Interest Perspective
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Why This Topic Is Trending
This topic has recently gained attention due to increased public interest. Search activity and Wikipedia pageviews suggest growing global engagement.
Search Interest & Related Topics
Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.