ATP-3-09-12 Field Artillery Counterfire and Weapons Locating Radar Operations Download
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Appendix J J-16 ATP 3-09.12 26 October 2021 J-66. The computer either accepts or rejects all parameters entered as search fence data. See figure J-11, friendly fire search fence parameters. Figure J-11. Friendly fire search fence J-67. The AN/TPQ-36 friendly fire mode logging procedures are described in Appendix B. OPERATING THROUGH ELECTRONIC COUNTERMEASURES J-68. Operating through electronic countermeasures consists of detecting the presence of jamming or interference and performing actions to minimize or eliminate the effects of jamming. AN/TPQ-36 J-69. The AN/TPQ-36 indicates jamming by displaying a vertical line at the jamming azimuth on the operational display, printing a jam strobe message, the interference or jamming indicator being lit on the operations screen, or for some types of jamming, displaying many short duration tracks on the monitor. To avoid degradation of AN/TPQ-36 performance the following tactics may be used: Turn on the WLR's electronic counter countermeasures feature. Avoid operation within line of sight or in the same sector as the jammer. Operate on a different frequency than the jammer. J-70. Turning on the AN/TPQ-36 electronic counter countermeasures function allows the operator to activate the jam strobe and pulsed interference rejection functions. The jam strobe identifies jamming and identifies the azimuth of the jamming while pulsed interference rejection helps filter out interference from the jammer. If pulsed interference rejection does not work, the other tactics can be implemented. Line of sight issues can be avoided by selecting optimal WLR sights. Relocating the AN/TPQ-36 to avoid jamming may or may not be possible based on the tactical situation. Changing frequencies will sometimes help avoid the jammer's operating frequency. Increment frequencies one at a time and determine from the jam strobe indicator if the jammer is still present. Increase the frequency, starting at the lowest frequency, the least amount necessary to avoid degrading the radars performance. If these steps do not work, it may be possible to fool the jammer by ceasing to radiate for a few minutes.