张光， 张英堂， 尹刚， 任国全， 李志宁， 范红波

1 军械工程学院7系， 石家庄　050003 2 65185部队， 辽宁铁岭　112611



一种磁张量探测系统载体的磁张量补偿方法

张光1, 2， 张英堂1， 尹刚1， 任国全1， 李志宁1， 范红波1

1 军械工程学院7系， 石家庄050003 2 65185部队， 辽宁铁岭112611

摘要针对磁张量系统载体产生的磁张量值对系统测量精度产生很大影响的问题，以及现有磁补偿模型存在非线性、分体式和参数多的问题，提出一种磁张量系统载体的一体化线性磁张量补偿方法.分析了载体硬磁材料产生固有磁张量值和软磁材料产生感应磁张量值的微观机理，并推导了相应的数学表达式，结合固有磁场影响和感应磁场影响建立了载体磁张量补偿模型.模型中含有20个载体磁张量补偿系数，对模型求解得到补偿系数，结合三分量磁场测量值即可达到对载体磁张量的补偿.实测实验表明，磁张量补偿方法计算得到的载体磁张量值与载体实际产生的磁张量值仅差32 nT/m，可以有效完成对磁张量系统的载体磁张量补偿.

关键词磁张量系统； 磁张量补偿； 固有磁场； 感应磁场

First, the magnetic tensor system is built, and the whole magnetic tensor is replaced by the expression of 5 elements. The magnetization characteristic of the hard magnetic material that comprises the carrier is analyzed, and the connatural magnetic field from carrier hard magnetic material does not vary with the change of carrier attitude and position. The mathematic model of the connatural magnetic field is constrcuted. The mechanism of the induced magnetic field from carrier soft magnetic material is analyzed, and the induced magnetic field is equivalent to the magnetic field superposition of several magnetic dipoles. The mathematic expression of the induced magnetic field is derived. The carrier magnetic tensor compensation model is established combined with the influence of the connatural magnetic field and the induced magnetic field, and the magnetic tensor compensation model with 20 coefficients is established by variable substitution and combined reduction. If we rotate the magnetic tensor system and carrier more than 4 attitudes under the equal magnetic field environment, and put the measured value of the magnetic tensor and magnetic field components into the carrier magnetic tensor compensation model, we can get the 20 magnetic tensor compensation coefficients. When the magnetic tensor system is applied to search the target, we can calculate the magnetic tensor value of the carrier with the 20 magnetic tensor compensation coefficients and the three components of the magnetic field. The magnetic tensor value of the target can be determined with the total magnetic tensor value subtracting the magnetic tensor value of carrier, and the carrier magnetic tensor compensation is realized.

On the wide lawn, the magnetic tensor system is fixed on the three-axis non-magnetic turntable, a piece of iron of 0.003 m3as the simulation carrier is put on the this turntable also with a certain distance from the magnetic tensor system. The three-axis non-magnetic turntable is rotated at different attitudes (to get more calculation accuracy, 10 attitudes are carried out), the measurement data of the magnetic tensor system are recorded. Using the magnetic tensor compensation method of this paper, the 20 magnetic tensor compensation coefficients of the simulation carrier are obtained with the measurement data. To test the validity of this compensation method, the three-axis non-magnetic turntable is rotated at another 4 attitudes, and the magnetic tensor value from the simulation carrier can be got with the 20 magnetic tensor compensation coefficients and the three components of magnetic field measured by the magnetic tensor system. The influence of the magnetic tensor of the simulation carrier is up to 653 nT/m before compensation, and the general targets can be submerged by it. After compensation, the influence is reduced to 32 nT/m, and to a certain extent, the magnetic tensor of the simulation carrier is compensated.

In this paper, the carrier magnetic tensor compensation model considering the connatural magnetic field and induced magnetic field is established. The model includes 20 magnetic tensor compensation coefficients, which can be solved by the model and the measurement data. The magnetic tensor generated by the carrier can be calculated using the 20 compensation coefficients and the three components of the magnetic field, and the carrier magnetic tensor compensation is realized. It is proved that the calculated magnetic tensor is very close to the real ones of the carrier by real measuring experiment, and the compensation method in this paper can effectively accomplish carrier magnetic tensor compensation.

1引言

磁张量系统可以实现对目标的定位和识别(Gamey et al., 2004; Nara et al., 2006; Stolz et al., 2006; 李光等, 2012)，为目标探测提供有效手段.近年来磁张量理论以及磁张量系统已经成为国内外研究热点.磁张量系统一般需要搭载到机动载体上进行探测，由于机动载体多由钢铁等铁磁性物质组成，铁磁性物质被地球磁场等磁化后具有磁性，对磁张量系统测量会造成一定影响.虽……