Defining Critical Technologies For Special Operations by Major Lawrence W. McLaughlin

Author:Major Lawrence W. McLaughlin [McLaughlin, Major Lawrence W.]
Language: eng
Format: epub
ISBN: 9781782899822
Barnesnoble:
Publisher: Tannenberg Publishing
Published: 2015-11-06T00:00:00+00:00

Figure 3.2 GPS Calculations From Ref. Alterman, 1995, p. 54.

GPS signals are vulnerable and becoming more vulnerable as companies such as Aviaconversia and others develop cheaper and smaller jammers. As we have just seen, these current jammers can be defeated, but is SOF effectively using these techniques to minimize their exposure to intentional interference of the GPS signals? The following paragraphs hope to answer this question.

As previously noted, GPS vulnerability can be reduced through the proper use of encryption which permits use of the P(Y) code which not only increases accuracy, but is harder to jam once the P(Y) code is acquired. By sampling SF, STS, SEAL, and SOF aviation units, I have found that all the units surveyed have access to and use GPS units designed for military use, therefore, have the ability to receive the P(Y) code. There are individuals who carry commercial GPS units as part of their personal gear, but I found no indication that the commercial units were being used as a primary navigation aid; they are only carried for personal use in an emergency or survival situation. Although SOF units have access to military GPS units capable of encryption, are the operators taking advantage of this added capability?

Overall, SOF units are taking advantage of the added capability of encryption to receive the P (Y) code. Most of the operators interviewed stated that the units used in the field are usually keyed. Although it appears that the GPS units are generally keyed, there is no indication that this is required in accordance with standard operating procedures or regulations. In addition, the operators are not fully aware of the importance of obtaining and maintaining the P-code during operations. Most operators were aware of increased accuracy, but most were not aware of the increased anti-jam capabilities that the P-code provided. By not realizing the full advantage of the encrypted GPS signal, less emphasis may be placed on proper encryption, possibly undermining the mission should jamming become a factor.

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