TY - JOUR AB - NORMALLY, the SSR interrogator is used in conjunction with a primary radar, the two systems being complementary. Primary Radar depends on the reflection of radio signals. These signals have to be strong enough to survive the two‐way path, therefore the emitted signals must be of relatively high power. Signals reflected from hills, trees, buildings and precipitation will also be received and displayed on the PPI, thus causing clutter on the display and confusing the picture. VL - 43 IS - 1 SN - 0002-2667 DO - 10.1108/eb034714 UR - https://doi.org/10.1108/eb034714 AU - Shipley R. PY - 1971 Y1 - 1971/01/01 TI - Secondary Surveillance Radar in ATC Systems: A description of the advantages and implications to the controller of the introduction of SSR facilities T2 - Aircraft Engineering and Aerospace Technology PB - MCB UP Ltd SP - 20 EP - 21 Y2 - 2024/04/19 ER -