地图匹配技术是组合导航系统中的一项关键技术.高精度的地图匹配技术依赖于高精度的地图数据以及高复杂度的地图匹配算法,时间和空间数据量越来越大,与嵌入式Linux系统的有限资源已经不匹配,因此在已有的嵌入式系统中实现地图匹配技术具有实际应用价值.提出一种针对嵌入式系统的地图匹配技术实现方法,利用Linux操作系统的实时性和嵌入式数据库SQLite的微小性,实现了200ms内完成基于曲线匹配的地图匹配算法,匹配精度达到10m以内,显著提高了惯性导航的定位精度,满足组合导航系统对地图匹配技术的精度要求.

To realize the dynamic high-accuracy measurement of high-accuracy linear array CCD 2-axis autocollimator, a high-accuracy location method for 4-reticle target center of high-accuracy linear array CCD autocollimator is proposed. First, CCD images are processed with Gauss-filter, which diminishes the noise and generates weighted images. Then, the sub-pixel location of weighted image's target center is acquired accurately by using barycentre method based on linear polynomial interpolation.Experimental results show that the proposed method is stable and accurate. Appling the method on the prototype, as a result, the measuring time of a single 2-axis angle measurement is less than 0.2s. The measure scope is±900″. The proposed method can efficiently fulfill the requirements in engineering systems.

In order to realize the requirement that the weapon system can random launch and“stop then hit”, the pa-per designs a positioning and aiming integrated system based on LSIMU. The system consists of the positioning unit and the aiming unit. The positioning unit takes LSIMU as the core, by using the method of moving base north seeking. The positioning unit configures a variety of measuring equipments (odometer, altimeter, maps, satellite positioning). It realiz-es the positioning capability by means of the integrated navigation. The aiming unit rigidly fixed on the positioning unit. It uses the optical way to realize aiming at the dynamic target. At the same time, the positioning unit is outputting the result. The system realizes the positioning and aiming integrated technology. Without loss of the aiming capability and positioning capability, it reduces the environmental requirements. It achieves the expected goal.

The temperature measuring and communication software is designed to gather and filter multiple temperature data, guarantee the measuring precision in a wide temperature range. It can receive position and navigation data of GPS in real time, and transmit satellite data well and truly in the rapid time. In the software, an appropriate process flow is designed, the calculating of temperature data and the noise eliminating are accomplished using the method of mean glide filtering in combination with the arithmetic average; Based on circular queue technology, the serial data can be received in real-time. Application proves: the software has a repeatability precision higher than 0.05℃ in temperature measuring, can timely and accurately send navigation data to the fire control computer, and can meet the demand that receiving and handing ephemeris data of several KB in the 2s without data lose, therefore providing a way to realize temperature compensation, data fusion and external information interaction for LSINS.

To meet the requirements for measuring accuracy and real-time performance of linear CCD 2-axis autocollimator, a precise center location algorithm based on Guassian filtering for high-accuracy linear CCD autocol?limator is proposed. Firstly, the influences of the noises in images are diminished by using Gauss-filter pretreat?ment. Then, the sub-pixel location of the target is acquired accurately by using barycenter method based on linear polynomial interpolation method. Experimental results show that the proposed method is fast, stable and accurate, the measure scope is ± 900″and the measuring accuracy is ± 0.5″in 0.2 s (a single measurement process) using the proposed method. The proposed method can efficiently fulfill the requirements in engineering systems.