Reducing the Sidelobes in Doppler-Range Beam Pattern and Controlling the Frequency Channel in SIAR

Synthetic impulse and aperture radar (SIAR) is a multi-input multi-output orthogonal multicarrier frequency radar, kind of frequency diverse array (FDA). This radar has omnidirectional emission in the transmitter and each receiver or receiving array can form a beam. The 4D matched filter of this rad...

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Bibliographic Details
Published in:Wireless communications and mobile computing 2023-08, Vol.2023, p.1-12
Main Authors: Yaghoubi Aliabad, Pourya, Soleimani, Hossein, Soleimani, Mohammad
Format: Article
Language:English
Subjects:
Antennas
Arrays
Elevation angle
Matched filters
Methods
Radar
Radar arrays
Receivers & amplifiers
Sidelobe reduction
Sidelobes
Transmitters
Weighting
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Summary:Synthetic impulse and aperture radar (SIAR) is a multi-input multi-output orthogonal multicarrier frequency radar, kind of frequency diverse array (FDA). This radar has omnidirectional emission in the transmitter and each receiver or receiving array can form a beam. The 4D matched filter of this radar’s circular arrays can reveal the range, elevation angle, azimuth angle, and Doppler. The existence of a high sidelobe in the range-Doppler is one of the significant challenges of this radar, and pulse-to-pulse frequency code non-agile (PPFCNA) and pulse-to-pulse frequency code agile (PPFCA) are often used to reduce it. Weighting is one of the available methods for reducing sidelobes in array radars, but weighting in the matched filter is more effective in SIAR radars due to their ability to transmit signals with different and orthogonal frequencies. This paper proposes the use of amplitude weighting in the submatched filter, which is made possible by increasing the degree of freedom in the SIAR process. In this method, each receiver’s signal is independently processed and weighted with a submatched filter. Then, a synthetic pulse is formed by combining the data from multiple channels. The output of the simulation with weighting in the matched filter for the PPFCNA indicates an 8.7908 dB reduction in sidelobes, while the output for the PPFCA indicates a 3.3779 dB reduction in sidelobes.
ISSN:1530-8669
1530-8677
DOI:10.1155/2023/3451354