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PLATFORM VULNERABILITY (PV)
SURFACE-SEARCH RADAR RANGE (SSR)

Aerographers Mate 1 & C
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APPLICATION The EMCON planner can use PV to assess the relative  vulnerability  of  the  various  emitters  on  a platform   versus   their   value   in   surveillance   or communication. The   object   is   to   minimize   the platform’s  vulnerability  to  counterdetection. LIMITATIONS AND ASSUMPTIONS The restrictions as well as the principles taken for granted in listing the PV program areas follows: . Make sure the environment selected from the refractivity data set is indicative of the location and time of interest. PV is range- and time-independent. . The maximum intercept range output is limited to 1000 km (541 nmi). The atmosphere is usually not horizontally homogeneous over these great distances. . PV doesn’t account for absorption of EM energy, In general, the absorption of EM energy by things such as oxygen, water vapor, fog, rain, or snow adds little to the  propagation  loss.  Refraction  is  considered  the  main factor  in  transmission. l PV is valid for frequencies between 100 MHz and 20 GHz. . Sea-reflected interference is also considered only if the receiver or emitter is below 100 m. l  The  effects  of  a  surface-based  duct  are considered  to  dominate  any  contributions  from  the evaporation  duct. l PV assumes the emitters are radiating at peak power. .  The  probability  of  detection  associated  with  the output ranges depends upon the probability of detection associated  with  the  receiver  sensitivities. . If you are attempting to verify ESM intercept ranges  achieved  by  your  own  receiver,  remember  that PV  outputs  maximum  intercept  range.  If  a  platform’s emitters  aren’t  turned  on  at  that  range,  there  will  be nothing  to  intercept. FUNCTIONAL  DESCRIPTION PV  computes  the  maximum  ESMR  of  an  emitter. ESMR is computed only if the emitter’s frequency falls within one of the frequency bands of the receiver. Table  7-3  shows  an  example  output  of  the  PV program. The bar graph shows the maximum range that Table 7-3.-Example Output of the PV Program 7-9







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