| 单载机相位差无源定位系统可观测性分析(英文) |
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| 作者单位： | 国防科技大学电子科学与工程学院，国防科技大学电子科学与工程学院，国防科技大学电子科学与工程学院 湖南长沙 410073，湖南长沙 410073，湖南长沙 410073 |
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| 摘 要： | With a pair of antennas spaced apart, an airborne passive location system measures phase differences of emitting signals. Regarded as cyclic ambiguities, the moduli of the measurements traditionally are resolved by adding more antenna elements. This paper models the cyclic ambiguity as a component of the system state, of which the observability is analyzed and compared to that of the bear- ings-only passive location system. It is shown that the necessary and sufficient observability condition for the bearings-only passive location system is only the necessary observability condition for the passive location system with phase difference measurements, and that when the system state is observable, the cyclic ambiguities can be estimated by accumulating the phase difference measurements, thereby making the observer able to locate the emitter with high-precision.
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| 关 键 词： | 航空飞行 相位差测量 被动定位系统 可观察性 |
| 收稿时间： | 23 August 2007 |
Observability of Airborne Passive Location System with Phase Difference measurements |
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| Authors: | Deng Wang Qiang Zhong Danxing |
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| Institution: | College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | With a pair of antennas spaced apart, an airborne passive location system measures phase differences of emitting signals. Regarded as cyclic ambiguities, the moduli of the measurements traditionally are resolved by adding more antenna elements. This paper models the cyclic ambiguity as a component of the system state, of which the observability is analyzed and compared to that of the bear- ings-only passive location system. It is shown that the necessary and sufficient observability condition for the bearings-only passive location system is only the necessary observability condition for the passive location system with phase difference measurements, and that when the system state is observable, the cyclic ambiguities can be estimated by accumulating the phase difference measurements, thereby making the observer able to locate the emitter with high-precision. |
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| Keywords: | passive location phase difference observability accuracy |
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