关键词: 干涉仪, 无源定位, 相位差, 误差, 克拉美-罗下限

Abstract: Due to the complex structure of multi-baseline interferometers and the drawback that bearings are easily affected by differences in amplitude and phase between the channels of an interferometer, a new single observer passive localization method using long baseline interferometer (LBI) phase rate-of-changing information only was proposed. The Cramér-Rao lower bound (CRLB) of this method was analyzed, and then the localization geometric dilution of precision (GDOP) under different baseline directions and different observer maneuvering modes was computed. The results show that when the locating emitter uses phase rate-of-changing information only, the interferometer should be parallel to the flight body to achieve the best flank direction localization precision, and that it should be vertical to the flight body to achieve the best front flank direction localization precision. The movement and attitude of the observer should also make some changes in the location process.

Key words: interferometers, passive localization, phase difference, error, Cramér-Rao lower bound