ATP-3-09-02 Field Artillery Survey Download
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Global Positioning System Application and Systems 16 February 2016 ATP 3-09.02 9-3 9-7. The satellites also broadcast an encrypted precise (P/Y) code. This transmission is the basis for the PPS that is used by military GPS receivers. These receivers must have crypto keys loaded to detect and nullify the SA errors, which allows for more accurate position data. Also, the crypto keys provide a means of unscrambling the encrypted P/Y code, which is an anti-spoofing (AS) protection. Receivers such as the AN/PSN-11 have this capability and are considered to be precise position system (PPS) receivers. Only PPS receivers are authorized for combat operations. FIELD ARTILLERY SURVEY APPLICATION 9-8. Each IPADS or IPADS-G team is allocated one each PLGR. FA survey personnel may use the AN/PSN-11 to initiate surveys when existing survey control is not available. This receiver allows the surveyor to begin surveying immediately with more accuracy than assumed data or a map spot. In extreme cases when a PADS/IPADS is not available the surveyor can use two AN/PSN-11s set-up as explained in Table 9-1 to provide position area data. The surveyor will mean the difference in data between the two AN/PSN-11s to obtain the most accurate data. 9-9. A description of all parts, components, and detailed operating procedures for the AN/PSN-11PLGR is in TM 11-5825-291-13. All operators should be thoroughly trained on all functions of the system before using the PLGR. The general PLGR survey positioning and orientation procedures are as follows: Setup. The setup selections allow the PLGR operator to select several options and modes of operation. (See TM 11-5825-291-13.) An example of a typical setup for artillery surveyors is shown in table 9-1 on page 9-4.