| The detection accuracy of a shipborn radar is crucial for a warship to build a clear situation of targets in the sea battlefield and for providing precise target indication for a shipborn weapon system. Calibration of shipborn radar accuracy is an important means to ensure the accuracy of shipborn radar measurement, and the purpose is to eliminate or reduce the system error existing in shipborn radar observations to the greatest extent. Calibration includes two steps:plotting and calibrating. This thesis focuses on the research of the methods and equipment to calibrate the shipborn radar detection precision, fundamentally solving the difficult problem of calibrating shipborn radar accuracy at any moment during the berth time of the ship in the non-shooting-range environment, without other forces in cooperation.This thesis mainly consists of four parts. The first part is the research of the methods and general schedule to calibrate the shipborn radar detection precision. It studies the active calibration method based on the memory and transmission, the dynamic calibration method based on the rotary-winged pilotless airplane, and the secondary calibration method based on the aerial symmetry and step-by-step scanning. The second part is the research on the static calibration equipment and key techniques: the active static calibration method based on the memory and transmission. It designs and realizes the static calibration equipment and provides the realization methods of 5 key techniques:Doppler modulation technique based on the digital frequency, complex radar signal adaptation technique, "time-space-frequency-energy" four-domain comprehensive treatment technique etc. and the actual data are analyzed. The third part is the research on the dynamic calibration equipment and key techniques:the shipborn radar dynamic calibration method based on the rotary-winged pilotless airplane. It designs and realizes dynamic calibration equipment and provides 4 key techniques:the cooperative target integration design, echo enhancement equipment and radar measurement data real-time acquisition etc. and the actual data are analyzed. The fourth part is the research on the combined data processing algorithm. It studies the dynamic data processing methods:unification of the spatio-temporal data, eliminating of outliers, and data mixed compensation filtering algorithm etc. and the actual processing effects are given.The results of this thesis indicate that the combination of static and dynamic calibration methods and the developed comprehensive shipboard radar calibration system have solved the problem of the shipboard radar non self-propelled calibration means in the non-shooting-range environment and realized the fact that one set of system can calibrate all shipboard radars on active duty. The calibration time of a ship’s 7-8 radars has reduced to two days from two weeks. There is no need for the shift of the ship and application for airplane, which has greatly shortened the time for combat preparation. The outcome of the research has produced great military and economic benefits. |
