Passive target positioning method and system based on TDOA and FDOA measurement

Abstract

The invention discloses a passive target positioning method and system based on TDOA and FDOA measurement. The method comprises the following steps: obtaining measurement information and receiving station position information; converting the position information of the receiving station to an earth-centered earth-fixed coordinate system; establishing a measurement equation according to the measurement information and the position information of the receiving station under the earth-centered earth-fixed coordinate system; performing deformation processing on the measurement equation in combination with prior information; and solving a target position vector by using the deformed measurement equation to obtain an estimated value of a target coordinate. According to the method, target prior range information is introduced, the range prior information is processed and then converted into an approximate value of an undetermined target height coordinate, and due to the acquisition of an additional coordinate, the fuzziness of three-station TDOA and double-station TDOA-FDOA positioning is avoided. According to the method, in the process of solving the target coordinates, the parameter-containing coordinate result is directly brought to the theoretical definition constraint formula to solve the parameters, introduction of additional errors is avoided, and the final positioning error is reduced.

Description

technical field [0001] The invention belongs to the technical field of target positioning, and in particular relates to a passive target positioning method and system based on TDOA and FDOA measurement. Background technique [0002] Passive positioning technology means that the observation station does not actively radiate electromagnetic signals, but only by measuring the parameters of the electromagnetic signals emitted by the external radiation source or measuring its visible light and infrared parameters to determine its position in space. The external radiation source signals available to the work platform are generally divided into two types: from the target itself [1] Or use signals transmitted from TV, radio, etc. [0003] Compared with active positioning systems, passive positioning systems have many advantages [2] : (1) Strong survivability, because the observation station will not radiate electromagnetic waves to the target, reducing the probability of being dis...

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Problems solved by technology

in the literature [10] In , this problem has been studied, but the height of the target needs to be known in advance, and the constraint relationship is established in the earth-centered earth-fixed coordinate system, and the solution is combined with the earth's radius. This method will introduce a large error due to the approximation of the earth's radius

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