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Combined doa and toa single station passive positioning method based on error correction

An error correction, passive positioning technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve problems affecting the passive positioning accuracy of external radiation source radar systems, and improve target positioning performance , good estimation performance, the effect of reducing complexity

Active Publication Date: 2020-09-01
合肥九州龙腾科技成果转化有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The iterative least squares estimation ignores the noise structure and correlation problems, which affect the passive positioning accuracy of the external radiation source radar system

Method used

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  • Combined doa and toa single station passive positioning method based on error correction
  • Combined doa and toa single station passive positioning method based on error correction
  • Combined doa and toa single station passive positioning method based on error correction

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Experimental program
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Embodiment Construction

[0023] Step 1: The receiving station of the external radiation source radar system receives the signal emitted by the target scattering third-party radiation source, and obtains the measurement information of the target azimuth angle of arrival DOA and time of arrival TOA, as follows

[0024]

[0025]

[0026] Among them, the receiving station is located at the origin (0,0), the number of transmitting sources is M, and the coordinate vector of the mth transmitting source is q m =(x m ,y m ); P targets, the coordinate vector of the pth target is θ p is the measured value of the azimuth angle of arrival from the target p to the receiving station, Δθ p is the systematic error of arrival azimuth, is the measurement error of the azimuth angle of arrival, with a mean value of 0 and a variance of Gaussian distribution. τ m,p is the time-of-arrival measurement value of the target p measured by the external radiation source radar system composed of the transmitting sour...

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Abstract

The invention discloses a combined DOA and TOA single-station passive positioning method based on error correction. According to measurement information obtained by a receiving station of an externalradiation source radar system, by introducing an auxiliary variable, a nonlinear equation is converted into a pseudo-linear equation, a pseudo-linear model between the state of a target position and the state of an observation station position is established, an iterative least square method is adopted for estimation, a constrained total least square estimation model is constructed, a constrainedoptimization problem is converted into an unconstrained optimization problem, a Newton iteration method is used for optimization and solution, and the correlation between the auxiliary variable and the target position is used for constructing a correlation least square estimation model, so that the target positioning performance is further improved. The target positioning accuracy is improved through combined estimation of the target position and system errors. Convenience is provided for improving the target positioning performance, the complexity of error registration under the premise of ensuring the estimation performance is reduced, and good positioning performance in the case of large measurement noise is achieved.

Description

technical field [0001] The invention belongs to the technical field of sensor passive positioning, and in particular relates to a single-station passive positioning method based on joint bearing angle of arrival (DOA) and time of arrival (TOA) based on error correction. Background technique [0002] External radiation source radar uses third-party non-cooperative signal sources (such as mobile phone communication signals, TV broadcast signals, and enemy radar information, etc.) The signal emitted by the source, and from the information, the observations that can be used for target positioning (Azimuth of Arrival DOA, Time of Arrival, etc.) are mined. The passive localization method based on external radiation sources is also called passive coherent localization (PCL). Under the condition of signal line-of-sight propagation, this method uses the above observation information to establish an algebraic equation between the target position state and the observation station posi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/46
CPCG01S13/46
Inventor 左燕陈志猛蔡立平张日东
Owner 合肥九州龙腾科技成果转化有限公司
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