| The advanced inertial measurement level of a country is an important symbol of military strength, it can be said that there is no advanced inertial technology there will be no advanced military equipments. The inertial navigation system attracted wide attentions and applications in various fields of attitude measurement, navigation and positioning with it's excellence of completely independent, free from any interference, output informative, and good real-time.Entering the 21st century, foreign laser gyro strapdown inertial navigation system (LINS) has being in the engineering stage. Compared with the international level, there are still certain gaps and LINS is still in the the early stage of development and application in some sensitive areas. China has adopted to introduce production lines to resolved laser gyro production problems, but how to from the device-level (laser gyroscopes, accelerometers, etc.) to the system-level, how to solve LINS's engineering applications facing the bad environmental conditions, and promote its application process in China, improve its accuracy to replace the imported products. There will be important academic value and practical significance to resolve these problems.Based on the aerospace preliminary research project NO:618020704 and the related LINS's engineering applications .According to the demands, this papers has designed the system scheme, complete the LINS hardware, done deeply research of key technology and test verification mainly centered on how to solve its high dynamic application precision and fast reaction ability under different conditions application.The main research works in this paper are as follows:①Based on the research projects index, design the overall system scheme. In system aspect, analyzed, demonstrated and calculated the index ,completed the overall program design of the systems, proposed the technical difficulties and the key point, and completed the prototype.This work provide the research base and research direction for the following key technologies.②Cone and high-frequency sampling error compensation study.Analysis the production of the cone error theoretically and studied the attitude algorithm of rotation vector; Analysis the characteristics of laser gyro output signal and its impact to the system error, pointed that to solve the problem ultimately of high dynamic precision ,the first step is to solve the asynchronism of system sampling and the low sampling frequency .The LMS adaptive filter is studied and the DSP sampling card is made . The sampling frequency reaches 5 KHz, much higher than 400 Hz sampling frequency in a whole cycle, also higher than HOLLEWELL 2. 4 KHz. The satisfying effect is achieve after high frequency and cone error compensated.③Dynamic characteristics and vibration reduction study of LINSStudied the error and characteristics of LINS under the high dynamic conditions especially the high vibration conditions.Study showed that the configuration of system barycentre, stiffness design and the selection of vibration absorber are the key factors which affect the system dynamic error,developed the way to adjust the system barycentre by the output of laser gyro. improved its dynamic performance through re-designed. The system position accuracy reached 120 meters (6 minutes,10.8g vibration)and 1.5 nm/h (CEP)through road car test.④System temperature compensationFocused on the system temperature compensation ,the temperature sensitive characteristics and the relativity between the output and the multi - temperature sensing pointed is studied ,tests showed that to achieve effective compensation the choose of the sensing points is one of the key, by using the nonlinear approach of neural network system realized the high precision compensation,the attitude precision reached 8" and the preparing time is shortened from 15 minutes to 2 minutes .The realization enhanced the vehicle weapon system's fast reaction ability.⑤Calibration and testThe achieved performance has meet the demands after calibration and test , in Sept. 2006, an experimental prototype of the project has been made in Langfang and YunGang regional ,results showed that the LINS achieved the following performance indicators: the azimuth accuracy higher than 9' ( 1σ,3h ), the horizontal positioning error less than 0.15D% (CEP), the attitude maintain accuracy is among the best ones.
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