Problem with Exterior Ballistic Measurements - An Exploration of (NS LevelPrecision) Group Delay Measurement Methods

摘要

This article makes a simple description of GPS (global positioning system)positioning precisions as well as its measurement methods. It elucidates test measurement levels reached domestically and existing problems. It puts forward effective pulse modulation and demodulation technologies to determine test measurement precisions and opts for the use of measurement duration intervals to replace phase measurements. This is capable of effectively making systems with the same frequencies and different frequencies reach ns level group delay measurement precisions. In conjunction with this, it gives test measurement method schematic diagrams as well as key equipment and explains that this system is capable of resolving a difficulty associated with GPS system zero calibration. (AN).