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Multi-frame Track Before Detect Method for the Netted Radar System
DOI: 10.12000/JR18092
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Abstract
Recently, Netted Radar System (NRS) has received much attention due to its robust performance gain. Usually, the NRS Detect Before Track (DBT) method detects the received data at each time, acquiring a set of alarm plots, and then transmits these plots or the trajectories obtained based on them to the fusion center, thus generating a global estimated result. However, when the Signal-to-Noise Ratio (SNR) is low, the performance becomes highly degraded because the targets cannot pass the single-frame detection threshold of DBT. To solve this problem, a netted radar Multi-Frame Track Before Detect (MF-TBD) method is proposed in this paper. First, MF-TBD is performed in local radar nodes, and then it acquires estimated target plot sequences and transmits them to the center for further fusion. MF-TBD can take advantage of NRS, and also can utilize target space time correlation through MF-TBD processing and enhance the target SNR. Thus, it can improve detection performance. However, the outputs of MF-TBD are different from that of DBT. Therefore, the current fusion methods for DBT are not suitable for MF-TBD. To solve this problem, this paper first derives a fusion method for plot sequences, then reports its processing steps in radar system, and finally proposes an implementation method based on the particle filter. The simulation results show that the proposed method has a detection performance gain of 4 to 6 dB than the traditional method based on DBT, and a 50% gain on estimation accuracy than single-sensor MF-TBD. -
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References
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- Figure 1. Block diagram of PSF-MF-TBD
- Figure 2. Steps of PSF-MF-TBD
- Figure 3. Sketch map of the simulation scenario
- Figure 4.
- Figure 5. Detection probability of MF-TBD and SFD for different SNR
- Figure 6. RMSE of PSF-MF-TBD and MSF-DBT
- Figure 7. RMSE of PSF-MF-TBD under different number of radar nodes
- Figure 8. RMSE of PSF-MF-TBD under different number of particle
- Figure 9. RMSE of different plot sequence fusion methods