APPLICATIONThe EMCON planner can use PV to assess therelative vulnerability of the various emitters on aplatform versus their value in surveillance orcommunication.The object is to minimize theplatform’s vulnerability to counterdetection.LIMITATIONS AND ASSUMPTIONSThe restrictions as well as the principles taken forgranted in listing the PV program areas follows:. Make sure the environment selected from therefractivity data set is indicative of the location and timeof interest. PV is range- and time-independent.. The maximum intercept range output is limitedto 1000 km (541 nmi). The atmosphere is usually nothorizontally homogeneous over these great distances.. PV doesn’t account for absorption of EM energy,In general, the absorption of EM energy by things suchas oxygen, water vapor, fog, rain, or snow adds little tothe propagation loss. Refraction is considered the mainfactor in transmission.l PV is valid for frequencies between 100 MHzand 20 GHz.. Sea-reflected interference is also considered onlyif the receiver or emitter is below 100 m.l The effects of a surface-based duct areconsidered to dominate any contributions from theevaporation duct.l PV assumes the emitters are radiating at peakpower.. The probability of detection associated with theoutput ranges depends upon the probability of detectionassociated with the receiver sensitivities.. If you are attempting to verify ESM interceptranges achieved by your own receiver, remember thatPV outputs maximum intercept range. If a platform’semitters aren’t turned on at that range, there will benothing to intercept.FUNCTIONAL DESCRIPTIONPV computes the maximum ESMR of an emitter.ESMR is computed only if the emitter’s frequency fallswithin one of the frequency bands of the receiver.Table 7-3 shows an example output of the PVprogram. The bar graph shows the maximum range thatTable 7-3.-Example Output of the PV Program7-9