Abstract
Phased array over-the-horizon (OTH) radar usually needs to detect sea target and airborne target in different directions. Conventionally, the sea target and airborne target are detected sequentially with the coherent integration completely accomplished for each of them. However, the long coherent integration time (CIT) required by the sea target makes the time interval between two airborne target detections too long, which is not conducive to tracking airborne target. To overcome this problem, this paper proposes a new timeframe multiplexing scheme, in which several short-time detections of airborne target are inserted into a long CIT of sea target detection. The proposed scheme seeks to improve the detection frequency of airborne target while ensuring the detection performance of two types of target. However, due to the insertion of airborne target detection, the echo from sea surface is received discontinuously which means that the coherent integration of sea target is incomplete. To tackle it, a recovery algorithm based on the Hankel structured matrix is introduced, which recovers the slow-time domain signal of each range bin and thereby guarantees the detection performance of sea target not damaged. Numerical simulations prove the effectiveness of the proposed algorithm for signal recovery, and also verify that the proposed operating scheme has a shorter time interval for airborne target detection, while the detection performance of two targets are well guaranteed.
Highlights
High-frequency sky-wave over-the-horizon (OTH) radar can monitor a broad area via ionospheric reflection [1]–[3]
(1) When the signal to clutter plus noise ratios (SCNR) of echo signal is small, the peak-to-average ratio (PAR) and main-to-side lobe ratio (MSLR) obtained by sare slightly higher than those obtained by s, which indicates that scan achieve a better sea target detection performance than sin this case
The scheme inserts several airborne target detections into a coherent integration time (CIT) of sea target
Summary
High-frequency sky-wave over-the-horizon (OTH) radar can monitor a broad area via ionospheric reflection [1]–[3]. To detect aircraft in airspace and to detect ship on sea surface, the pulse repetition interval (PRI) of the transmit waveform and the coherent integration time (CIT) are different, due to the different characteristics of environments and targets [6]–[8]. Z. Wang et al.: Modified Sequential Multiplexed Method for Detecting Airborne and Sea Targets With OTH Radar information contained in the echo is limited, and the performance of the above estimation methods can be affected by many factors. We engage a novel operating scheme for OTH radar simultaneously detecting the sea target and airborne target. (1) A new operating scheme is developed for OTH radar to detect airborne target and sea target in different directions. CONVENTIONAL OPERATING SCHEME Denoting the PRI as T and the number of pulses within a CIT as M , the transmitted waveform can be expressed as.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
