On the wide area multilateration system, the barometric altitude of the targets can be used to adjust the positioning algorithm. This method ensures the convergence of algorithm and increases the accuracy of positioning. However, only parts of response signals sent by onboard transponders contain the barometric altitude of the targets. In multilateration system, a data association method is used for solving this problem. If the response signal doesn't contain the barometric altitude of a target, this method can help to get the latest last altitude which can be used to adjust the positioning algorithm. In addition, for the impact of wide area surveillance, if only three stations are used to calculate target position, positioning algorithm will get two positions. This method can help to get the latest last two- dimension position which can he used to choose the correct position. Real test results have proved the feasibility and validity of this method.%多点定位系统应用于广域目标定位时,可以采用目标气压高度对定位算法进行修正,从而保证算法的收敛性,提高定位精度.但不是所有民航机载二次应答机发送的应答信号模式中都包含目标气压高度,为了解决这个问题,多点定位系统采用了一种数据关联方法,使得在没有获取到目标气压高度时可以利用关联获得目标上时刻最新高度,由此修正定位算法.此外,通过关联还可以获取目标上时刻最新水平位置,在由于监视区域宽广造成只有3个站来定位目标而出现双解时可利用该水平位置选取正确解.通过实际数据测试验证了该方法的可行性.
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