ATP-3-09-02 Field Artillery Survey Download
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Chapter 9 9-8 ATP 3-09.02 16 February 2016 CONTINUOUS 9-23. At the completion of power on, the DAGR transitions to continuous mode if the receiver is connected to external power and is configured to operate as if connected to an unlimited power source (for example, vehicle power) and no self-test failures have been found. When in continuous mode, the DAGR tracks satellites to produce a continuous PVT solution. This mode requires more power than fix or standby modes. FIX 9-24. At the completion of power on, the DAGR transitions to fix mode momentarily when the receiver is operating on battery power or when connected to external power and configured to operate as if connected to a limited power source and no self-test failures have been found. When in fix mode, the DAGR tracks satellites to produce a current PVT solution. The DAGR automatically transitions to standby mode after a position fix has been obtained. This conserves battery power. AVERAGE 9-25. Average mode is for survey applications where the DAGR is stationary and must not be moved. Satellite signals are continuously received. This mode is also used to improve performance in very low signal environments (such as under dense foliage) but will not improve performance when the satellite signal is lost (such as being in a cave). The DAGR displays a note to the operator upon entering average mode indicating that the receiver and external antenna (if applicable) must remain stationary (approximately 2 to 4 hours). The DAGR produces more accurate PVT solutions in this stationary position. The DAGR provides an average position and a counter to show the number of position samples used in calculating the position. DAGR LIMITATIONS AND CONSIDERATIONS Note. The DAGR antenna must have an unobstructed view of the sky. When using the DAGR internal antenna, the receiver must be held at a 90-degree angle to the horizon for best reception. MASKING 9-26. When attempting to acquire satellites after the signals have been blocked for a period of time (for example, when exiting a cave) acquisition time may be improved by momentarily cycling the unit to Standby mode and then back to the previous operating mode. 9-27. If expecting to operate in conditions where tracking satellites is not possible (such as entering a cave), the DAGR should be placed in standby mode prior to entering these conditions. When back in unobscured conditions, set the DAGR back to a satellite tracking mode, and the DAGR performs a direct Y-code acquisition (if CV keys are loaded). If the DAGR is left in a satellite tracking mode for a period of 1 hour or more while obscured, the ability to perform direct Y-code reacquisitions may be lost. 9-28. If expecting to operate in conditions where satellite signals are weak (such as dense foliage), the DAGR should be placed in average mode and DAGR should be kept stationary. Do not move DAGR in average mode. When back in unobscured conditions, cycle the DAGR to standby then back to a satellite tracking mode, and the DAGR performs a direct Y-code acquisition (if CV keys are loaded). If the DAGR is left in a satellite tracking mode for a period of 1 hour or more while obscured, the ability to perform direct Y-code reacquisitions may be lost. TEMPERATURE AND HUMIDITY 9-29. DAGR temperature and humidity ranges are listed below. Anything outside these limits is considered unusual conditions. Operating temperature range. 32 to +70 °C (-26 to +158 °F). Storage temperature range (without batteries). 55 to +70 °C (-67 to +158 °F).