Frequency domain fuzzy sub-peak suppression method for LTE external radiation source radar

Abstract

The invention belongs to the technical field of radar signal processing, and particularly relates to frequency domain fuzzy subpeak suppression method for an LTE external radiation source radar. The method comprises the steps of obtaining an echo signal and a reference signal; suppressing the echo signal by using the reference signal through an extended cancellation algorithm to obtain a target reflection echo signal; demodulating the reference signal to obtain a standard reference signal; obtaining a regularized least square model according to the reference signal and the standard reference signal, and solving the regularized least square model to obtain a fuzzy correction factor of the reference signal; correcting the original reference signal according to the fuzzy correction factor toobtain a corrected reference signal; and performing coherent processing on the corrected reference signal and the target reflection echo signal to obtain a target detection result without a false peak. The method has the beneficial effects that the radar performance is improved, the fuzzy sub-peak suppression performance is high, and the adaptability and robustness are high.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method for suppressing fuzzy secondary peaks in frequency domain of LTE external radiation source radar. Background technique [0002] External radiation source radar is a radar system that does not actively emit electromagnetic wave signals, and mainly relies on the existing third-party non-cooperative radiation source signals in the target reflection environment to detect, locate and track the target of interest. Compared with traditional radar, it has the advantages of anti-interference, anti-stealth, small size, low cost, rich types and wide distribution of radiation source signals. Currently, signals that can be used as illumination sources include FM broadcast signals, analog / digital television signals, satellite signals, and Long-term evolution (LTE, long-term evolution) signals. Among them, the LTE signal has received extensive attention bec...

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Problems solved by technology

This method has poor performance and can only remove a small part of the energy of the ambiguous side peak

Second, to reconstruct the physical signal CSR and physical channel information PDCCH, first use the ambiguity function characteristics of the original LTE signal to calculate the mismatch factor; then compensate the mismatch factor to the original LTE signal, and correct the CSR and PDCCH information; finally use the corrected The signal and the echo signal are coherently accumulated. This method requires a calculation of the self-fuzzy function, and the amount of calculation is large, which is not conducive to the realization of

[0005] In summary, the above existing methods cannot effectively suppress the fuzzy secondary peaks in the frequency domain generated by the LTE signal as an external radiation source radar illumination source, and reduce the probability of false alarms and missed alarms in target detection.

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