Methods Reserch On GNSS/INS Navigation Of Missile

This paper describes the development of inertial navigation and satellite navigation, and then point out the deficiencies of strapdown inertial navigation system .GNSS(Global Navigation Satellite System)/INS(integrated navigation System) is an excellent navigation system with high capability, low cost, small volume and high reliability . It is the tendency of current navigation systems . Integrated navigation system is the nature of the use of external information , using Kalman Filter, estimating the parameters of the amendment, thereby enhancing the accuracy of the system .GPS/INS,a primary way for integrated navigation systems, has some limitations when used in the military field of the nations excluding USA and its allied countries. GPS is controlled by Department of defense of USA and therefore has some SA services. Nevertheless , GNSS integrated navigation system gets rid of such disadvantages and greatly enhances the precision and dependability of navigation system in addition. Hence it is a prosperous aspect for integrated navigation system to develop in the future.Developed GNSS/SINS navigation simulation system, simulate inertial navigation, GPS, GLONASS and various combinations .After error analysis and experimental comparison, in relation to the above form of several separate navigation, GNSS/INS has a higher accuracy ,compensating for strapdown inertial navigation system deficiencies with accumulating over time deficiencies.In GNSS/SINS navigation simulation system, false distance and false distance rate combination or position and velocity combination, Six of one, half a dozen of other. false distance and false distance rate combination possess less qesture error, but velocity error of the position and velocity combination is little one number grade than integrated navigation system only; when position and velocity combination is steady, velocity's repair is better; when false distance and false distance rate combination is steady, qesture and position's repair is better; therefore, in order to different demand to choose different navigation system.In order to improve orientation precision, navigation star's choice by usually size of synthetical performance quideline(GDOP) to weigh stand or fall position of the navigation star. GDOP's numerical value is litter and more. In the same condition, numerical value of GPS/GLONASS combinatorial constellation system is less. And that , saving accept star's time, all the more make for improve orientation precision.