Analysis and side peaks identification of Chinese DTTB signal ambiguity functions for passive radar

Gao, Zhiwen; Tao, Ran; Wang, Yue

doi:10.1007/s11432-009-0149-y

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…Therefore, some improvements should be made since the emitter signal cannot be replaced by Doppler-sensitive signals. The Doppler effect can be properly described as a Doppler compression factor in wideband case [15], so as a result, we investigate the association between the MF output and the main ridge slice of the signal’s wideband ambiguity function (WBAF) in this paper [16]. It can be directly related to the performance of velocity estimation for HFM signals.…”

Section: Introductionmentioning

confidence: 99%

An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

Huang

Fang

Han

2018

Sensors

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In active sonar systems, the target echoes are usually equivalent to a superposition of the Doppler-scaled reflections from multiple highlights. The reflections overlap with each other both in the time and frequency domain, which results in a decreased velocity estimation performance. Recently, the hyperbolic-frequency modulated signal has been widely employed in sonar systems for moving targets due to its Doppler tolerance, while the precise velocity estimation becomes a great challenge under such conditions. In this paper, the echo c is modeled onsidering a target with a constant velocity and multi-highlights. The velocity estimation performance is analyzed though the signal’s matched filter and the wideband ambiguity function. An improved method based on the sliding window matching algorithm is proposed to improve the performance. The method controls the energy of environmental noise and interference by focusing on the dominant target highlight, and applying a designed window which utilizes the Doppler characteristics of hyperbolic-frequency modulated signals. Simulations and lake experiment allow us to compare between the improved method and the conventional matched filter method. The results verify the influence of the multi-highlights in velocity estimation and indicate that the improved method has more effective performance.

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Section: Introductionmentioning

confidence: 99%

An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

Huang

Fang

Han

2018

Sensors

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“…Nowadays, broadcast transmissions are increasingly changing from analog to digital. China has published standards for UHF-band digital broadcast (or digital television), including China mobile multimedia broadcasting (CMMB) [19] and digital television terrestrial multimedia broadcasting (DTMB, also known as DTTB in some literature [20]) [21]. CMMB is tailored for mobile phone or handheld terminal equipment with small screens, whereas DTMB is designed for home or onboard television.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research for CMMB-Based Passive Radar Under a Multipath Environment

Wan

Zhang

et al. 2014

IEEE Trans. Aerosp. Electron. Syst.

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China mobile multimedia broadcasting (CMMB) is a digital television standard that works in a single-frequency network (SFN)at the ultrahigh frequency band and adopts orthogonal frequency division multiplex modulation with a cyclic prefix (CP-OFDM). This paper investigates the practical feasibility of a CMMB-based passive radar (CPR) in the multipath propagation environment. First, several aspects involving system considerations induced by propagation conditions and radar signal characteristics are analyzed, including power budget, dynamic range requirement, clutter rejection metrics, and ambiguity function analysis. Then targeting the problems caused by multipath signals in the complex propagation environment and corresponding processing techniques are discussed, covering reference signal extraction and clutter rejection, as well as, tracking and localization. The highlight is clutter rejection with subcarrier-based spatial adaptive processing (SSAP), which is matched with the features of CP-OFDM. The applicability of SSAP under severe channel response spread mainly contributed by SFN is specially considered. Last, a description of the experiments and the CPR systems developed by Wuhan University is given, together with results from previous field trials for low-altitude aircraft and ship detection.

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“…The main opportunity transmitters are GSM, GPS, audio and television broadcasting [1][2][3]. The surveillance and the reference channel are two receiving channels of the PCL radar.…”

Section: Introductionmentioning

confidence: 99%

Direct path wave purification for passive radar with normalized least mean square algorithm

Zhao

Yongke

et al. 2013

2013 IEEE International Conference on Signal Processing, Communication and Computing (ICSPCC 2013)

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The passive coherent location (PCL) radar detects potential targets by computing the cross ambiguity function (CAF) between the target echo signal and the direct path wave, which is regarded as the reference signal received from the reference channel. However, a number of the multipath interferences present in the reference signal in most cases. The existence of the multipath interferences can increase the false alarm rate and raise the detection threshold giving rise to lower detection rate. Therefore, the direct path wave should be purified. This paper proposes a direct path wave purification algorithm based on the normalized least mean square (NLMS) algorithm. This algorithm can attenuate the multipath interferences of the direct path wave, which results in the lower false alarm rate and lower detection threshold. This algorithm is validated by the experimental results.

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Analysis and side peaks identification of Chinese DTTB signal ambiguity functions for passive radar

Cited by 13 publications

References 13 publications

An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

Experimental Research for CMMB-Based Passive Radar Under a Multipath Environment

Direct path wave purification for passive radar with normalized least mean square algorithm

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