噪扰条件下数字式多基线相位干涉仪解模糊问题

数字式多基线相位干涉仪具有能被动测向、且测向精度高的优点。为了解决增大最大无模糊角度与提高测向精度之间的矛盾,将会在多基线干涉仪中采用参差基线关系进行测向,这样可以大大增加最大无模糊角度。但在噪扰条件下,还有一些有待讨论的问题,包括:正确解模糊的条件,对输入信号信噪比的要求,理论的测向精度以及参差系数的选取等。对以上这些问题进行了深入的研究,给出了正确解模糊允许的最大噪扰、最低信噪比和可以正确解模糊的角度范围,仿真结果表明了理论分析的正确性。

Solving ambiguity problem of digitized multi-baseline interferometer under noisy circumstance

Digitized multi-baseline interferometer had the merits of finding direction passively and high direction accuracy. But it was a conflict that enlarge maximum unambiguous direction and improving direction accuracy at the same time. To deal with such problem, stagger baselines were adopted, thus maximum unambiguous direction could be enlarged greatly. The influences the noise may have on the direction result were presented. The following problems was discussed: condition of solving ambiguous correctly; limitation for input SNR; direction accuracy and selection of stagger parameters. The maximal noisy, minimal SNR and direction range of solving ambiguous correctly were put forward.The correctness of theoretics analysis is effectively demonstrated by computer simulation.