Abstract
A common radar system calibration approach is to use civil aviation automatic dependent surveillance-broadcast (ADS-B) data to register errors. Considering the temporal and spatial uncertainties in radar system observation data, a specific iterative closest point (SICP) algorithm is proposed for estimating two-dimensional (2D) radar system errors. Radar system errors consist of the measurement deviations for the slant range and azimuth of the target and are spatially reflected by the difference between the observed and actual (ADS-B-observed) positions of the same target. Thus, the SICP algorithm is used to register the tracks corresponding to radar and ADS-B observation data. The radar system errors are reflected by a translation, rather than a rotation, of the observation data. Therefore, in the SICP algorithm, a unit matrix first replaces the rotation matrix in the iterative closest point (ICP) algorithm. Then, the translation matrix is iteratively calculated, and finally, the cumulant of the translation matrix is calculated as the radar system error. The proposed algorithm is advantageous because it does not require the temporal registration of radar and ADS-B observation data when temporal and spatial uncertainties are present (e.g., when 2D radar observation data have low accuracy and contain many outliers). Additionally, the SICP algorithm can effectively reduce the dependence on sensor data accuracy. The experimental results obtained based on simulated and measured data demonstrate that compared to conventional registration algorithms, the proposed algorithm can rapidly and accurately estimate radar system errors and has higher registration accuracy.
Highlights
In a radar network system, multiple radars transmit detection data to the data fusion center for data fusion
The specific iterative closest point (SICP) algorithm estimates the radar system error by calculating the deviation between the curves fitted to the radar and the automatic dependent surveillance-broadcast (ADS-B) observation data in the radar coordinate system
When the theoretical value of the radar system error is known, the root-mean-square errors (RMSEs) of the radar system error components are used for evaluation, which are defined as follows: RMSE
Summary
This work was supported in part by the National Natural Science Foundation of China under Grant 61703280, in part by the Zhejiang Natural Science Foundation under Grant LY20F020011, and in part by the International Science and Technology Corporation Base for Resource and Environment Informationization of Gansu Province.
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