Measurement of Group Delay at ns Level Precision in Exterior Ballistic Measurements,
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
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The importance of making use of GPS measurement systems to carry out external measurement track determinations is briefly described. Test measurement levels which have been reached inside and outside China are elucidated as well as problems which exist. pulse modulation and demodulation technologies to effectively resolve test measurement accuracies are put forward. Opting for the use of time interval measurements in place of phase measurements, it is possible to effectively make systems with the same frequencies and different frequencies attain ns level group time delay measurement precisions and it is possible to help in resolving GPS system zero correction difficulties.