ATP-3-09-02 Field Artillery Survey Download
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Chapter 9 9-6 ATP 3-09.02 16 February 2016 POWER 9-14. The PLGR will normally be operated by using either a BA5800/U lithium battery or 24-volt vehicle power. Operating in the continuous mode, the battery will provide adequate power for about 15 hours at 71°F. During extended missions, spare batteries must be readily available. Using vehicle power eliminates this problem; however, the correct polarity must be observed to prevent damage to the system. WARNING Remove lithium batteries from AN/PSN-11 PLGR before connecting it to external power. (The AN/PSN-11 PLGR could explode and injure Soldiers or damage equipment.) SECTION II – DEFENSE ADVANCED GLOBAL POSITIONING SYSTEM RECEIVER AN/PSN-13 9-15. The DAGR is a handheld or host platform mounted unit that receives and decodes RF signals from satellites to provide PVT (position, velocity [ground speed], and time) position reporting, and navigation capabilities. The DAGR’s primary function is to navigate through terrain using stored waypoint position information. Crypto keys may be loaded into the DAGR for increased PVT accuracy and protection from intentional false or spoofed satellite signals. Mission data can be selectively cleared or zeroized at any time. The DAGR is used in other operations such as waypoint calculations, data transfer, targeting, determining jamming sources, gun laying, and man overboard. NAVSTAR GLOBAL POSITIONING SYSTEM 9-16. The NAVSTAR GPS is a space-based navigation and timing system. It provides highly accurate, continuous, all weather, 3D PVT. A constellation of satellites transmit radio frequency (RF) signals for use by navigation sets. Each signal is modulated with a unique code sequence and navigation data message. The code sequence allows the navigation sets to identify each satellite. The navigation data message provides the navigation set information about the operation of each satellite. The navigation sets receive the signals and compute PVT. GPS receiver provides precision guidance capabilities for vehicular, hand-held, sensor, and gun laying applications. The DAGR offers the smallest and lowest weight hand-held receiver, with an easy-to-use man-machine interface (Graphical User Interface [GUI] and moving maps) and a proven design that passes environmental, serial port, and software testing for a low risk, field-ready unit. 9-17. The GPS structure is made up of multiple satellites, a ground control system, and any number of navigation sets. The satellites orbit the earth while the ground control acts as a monitor and control center for the satellites. The navigation sets are receivers that can be installed in a host platform or carried by personnel. 9-18. Satellites provide navigation data to the navigation set. The satellites are arranged in six rings that orbit the earth twice a day. This arrangement provides worldwide, continuous coverage. 9-19. The Ground Control System tracks the satellites, checks and controls satellite orbits, and updates the satellite navigation data message. The ground control system consists of monitor stations and a control center. Monitor stations are unmanned stations located throughout the world. They use special GPS receivers to track each satellite. The tracking information is sent to the control center where it is used to calculate precise satellite position and satellite clock error for each individual satellite. This data is called ephemeris data. The control center calculates satellite position for all satellites, called almanac data. Once each 24 hours, the control center sends the ephemeris and almanac data to each satellite. This updates the navigation data message broadcast by the satellite. 9-20. The navigation set receives and decodes RF signals from the satellites. This decoded information is used to calculate 3D position, 3D speed, and exact time data. The navigation set is able to track satellites