瞄准吊舱捷联惯导系统快速传递对准方法

 新型瞄准吊舱系统中安装捷联惯导系统,使其在跟踪、探测目标的同时具备一定的自主导航能力。吊舱系统中的捷联惯导一般采用较低精度的惯性器件配置,且传递对准实现过程受到机动条件的严格限制。针对该问题提出了一种“比力积分/角速度匹配”传递对准方法,利用主惯导导航信息与惯性器件输出,以及子惯导惯性器件输出实现子惯导的对准。推导了基于主、子惯导系统误差的数学模型,详细分析了器件精度与低动态条件对系统状态量可观测度的影响,并针对低精度惯性器件与低动态条件下的传递对准性能进行了数字仿真。仿真结果表明,该方法在器件低精度与低动态条件下,对准性能达到5′,优于常规传递对准方法,可满足瞄准吊舱捷联惯导系统的快速对准性能要求。

Rapid Transfer Alignment Method of Strapdown Navigation System Fitted in Targeting Pod

Besides performing the function of tracking and detection of targets, novel targeting pods have strapdown inertial navigation systems equipped in them to perform the navigation function. The strapdown navigation system fitted in a targeting pod usually adopts low precision inertial components, and the transfer alignment process is performed only in low dynamic conditions. To solve the above problem, a novel transfer alignment method is proposed to estimate and modify the misalignment and other states in real time. The method utilizes the specific force difference integration and angular velocity of the main inertial navigation system and the slave inertial navigation system to implement transfer alignment. The observability of the system states is analyzed in conditions of low instrument precision and low dynamics. A simulation project is designed and the result shows that the misalignment of the method can meet the performance requirements of rapid transfer alignment and that the performance reaches 5′, which is better than the traditional alignment method in conditions of low instrument precision and low dynamics.