An Efficient Estimator for Moving Target Localization Using Multi-Station Dual-Frequency Radars
Abstract
:1. Introduction
- (1)
- The effects of signal noise ratio (SNR) and the number of samples on the performance of range estimation are analyzed in the paper. The fundamental work has been done for performance analysis of dual-frequency radars in [10] where the influences of drift in frequency and I/Q mismatch were studied. SNR and the number of samples are another two important factors which will greatly affect the performance of range estimation.
- (2)
- A novel localization method with closed-form solution and high positioning accuracy is proposed for a multi-station dual-frequency radars system. The proposed method first derives the variances of the phase measurements. Based on the derived variances, the two weighted matrices can be calculated for two-step solutions. Due to the weighted information, the proposed method can provide the better performance than the LS estimator.
- (3)
- Performance analysis for the proposed method is presented in this paper. Both the theoretical variance and Cramer–Rao lower bound (CRLB) for the proposed method are derived in the paper. The derived CRLB can provide a benchmark for MT localization in the dual-frequency radars system to evaluate the performance of any unbiased estimator. They have not been addressed in the literature.
2. System Model
3. Closed-Form Solution for Dual-Frequency Radars
3.1. Performance Analysis of Range Estimation Using FFT
3.2. Closed-Form Solution for Multi-Station Dual-Frequency Radars System
4. Cramer–Rao Lower Bound
- ,
- , where the starting index of 1 in is .
- , where the starting index of 1 in is .
- is the noise vector and
5. Simulation Results
5.1. Range Estimation
5.2. Target Localization
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Huang, J.; Zhang, Y.; Luo, S. An Efficient Estimator for Moving Target Localization Using Multi-Station Dual-Frequency Radars. Sensors 2017, 17, 2914. https://doi.org/10.3390/s17122914
Huang J, Zhang Y, Luo S. An Efficient Estimator for Moving Target Localization Using Multi-Station Dual-Frequency Radars. Sensors. 2017; 17(12):2914. https://doi.org/10.3390/s17122914
Chicago/Turabian StyleHuang, Jiyan, Ying Zhang, and Shan Luo. 2017. "An Efficient Estimator for Moving Target Localization Using Multi-Station Dual-Frequency Radars" Sensors 17, no. 12: 2914. https://doi.org/10.3390/s17122914
APA StyleHuang, J., Zhang, Y., & Luo, S. (2017). An Efficient Estimator for Moving Target Localization Using Multi-Station Dual-Frequency Radars. Sensors, 17(12), 2914. https://doi.org/10.3390/s17122914