Multi-dimensional Ambiguity Function for Coherent Pulsed-LFM FDA Radar

Wang, Huake; Liao, Guisheng; Xu, Jingwei; Zhu, Shengqi

doi:10.1088/1742-6596/1169/1/012017

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…The traditional ambiguity function characterises the output of the matched filtering [26]. Since the transmit signal of IRCS‐FDA is angle‐time‐dependent, the traditional range‐Doppler ambiguity function cannot evaluate its performance.…”

Section: Signal Modelmentioning

confidence: 99%

Low‐sidelobe waveform design for integrated radar‐communication systems based on frequency diversity array

Jin

Zhang

et al. 2023

IET Signal Processing

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Frequency diversity array (FDA) radar can provide full spatial coverage with stable gains within a pulse duration. Based on the FDA, the integrated radar‐communication system can perform multi‐directional communication and whole‐space detection. However, the embedded communication bits disrupt the correlation of the transmitting waveform of each element. Correspondingly, the range sidelobe level (SLL) of the multi‐dimensional ambiguity function increases significantly. To address this issue, a low‐sidelobe waveform for integrated radar‐communication systems based on the FDA was designed. Two techniques based on the subarray time delay are employed to reduce the SLL in range dimension. Both methods, however, lower the angular resolution. Thus, a tangent FM signal as the baseband waveform to improve the angular resolution was selected. Simultaneously, the received signal processing methods of radar and communication was designed. The performances of the designed waveform are verified by analysing the multi‐dimensional ambiguity function and the bit error rate. The simulation results reveal that the proposed method can maintain a good radar target detection capability and satisfy the communication function.

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Section: Signal Modelmentioning

confidence: 99%

Low‐sidelobe waveform design for integrated radar‐communication systems based on frequency diversity array

Jin

Zhang

et al. 2023

IET Signal Processing

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“…Furthermore, both spatial receive beamforming and temporal matched filtering can be implemented in one step by designing the joint space-time matched filtering function as follows In this section, the effectiveness of the proposed method is examined and compared with the recent study. Multidimensional ambiguity function (AF) [23] which is an effective evaluation tool in array signal processing, is applied to validate the high DOFs characteristics of the proposed transmitting strategy. Considering a collocated pulsed-coherent FDA radar with uniform linear antenna array set in azimuth, the system parameters in simulation are shown in Table 1.…”

Section: Received Signal Processing Of the Proposed Transmitting Stra...mentioning

confidence: 99%

Transmitting strategy with high degrees of freedom for pulsed‐coherent FDA radar

et al. 2021

IET Radar Sonar & Navi

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Multidimensional and flexible radar resource transmission in time, frequency and space domains is strongly demanded for advanced digital array radar to meet the challenging observation requirements. In this study, a high degrees of freedom (DOF) transmitting strategy is proposed for pulsed-coherent frequency diverse array (FDA) radar. The flexible beam scanning property of coherent FDA radar is well developed by combining with spatial transmit array weighting and temporal piecewise waveform design. The proposed method fully exploits the transmitting DOFs of coherent FDA radar, which not only enables the transmit beampattern shaping but also promises the ability of spatial waveform diversity and transmitting energy allocation. Since the spatial transmitting signal bandwidth is preset, a received signal processing method with a variable sampling rate is proposed to avoid over sampling in all receiving channels. Simulation results validate the effectiveness of the proposed method and further demonstrate its potential applications.

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“…Although the dot-shaped transmit beampattern can enhance the signal energy in the target area, the dot-shaped beam cannot automatically scan space without the aid of phase shifters or a rotating array. Wang et al [22,23] have proposed a waveform design method based on piecewise linear frequency modulation (LFM) signals and dividing space into Q continuous angular sectors, to achieve automatic beam scanning and increase the echo signal energy. Since distinct sub-LFM signals are distributed in different angular sectors, the transmitted beampattern, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A waveform design method for frequency diverse array systems based on diversity linear chirp waveforms

Wang

Song

2021

Int. J. Microw. Wireless Technol.

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A frequency diverse array (FDA) radar has attracted wide attention, due to its capability to provide a range-angle dependent beampattern and to scan the spatial without phase shifters or rotating arrays. However, FDA systems will suffer from low echo signal energy or high sidelobe peaks when detecting targets by beamforming based on existing receivers. To reduce the sidelobe peak of detection results while increasing the echo signal energy, in this paper, we propose an FDA radar system based on diversity linear frequency modulation waveforms. Correspondingly, we propose a receiver architecture with a time-variant beamforming chain. The proposed system retains the ability of the FDA system to automatically spatial beam scanning, owing to the frequency increment across elements. By increasing the pulse duration of transmitted signals, we enhance the echo signal energy. By applying the artificial bee colony algorithm to design the bandwidth of each chirp signal, the proposed system reduces the sidelobe level of detection results while increasing pulse width. Numerical simulation results are presented to demonstrate the effectiveness of the proposed system.

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Multi-dimensional Ambiguity Function for Coherent Pulsed-LFM FDA Radar

Cited by 5 publications

References 9 publications

Low‐sidelobe waveform design for integrated radar‐communication systems based on frequency diversity array

Low‐sidelobe waveform design for integrated radar‐communication systems based on frequency diversity array

Transmitting strategy with high degrees of freedom for pulsed‐coherent FDA radar

A waveform design method for frequency diverse array systems based on diversity linear chirp waveforms

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