Equivalent point estimation for small target groups tracking based on maximum group likelihood estimation

Zhou, Chao; Wang, Rui; Hu, Cheng

doi:10.1007/s11432-019-1518-x

Cited by 2 publications

(3 citation statements)

References 9 publications

(11 reference statements)

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“…Hence, the spectrum in ( 19) can be rewritten as Moreover, as shown in Figure 9b, the spectrum amplitude of the Fresnel integral and rectangular windowed LFM subpulse presents a sinusoidal shape with a period of T p /2. Hence, the spectrum in (19) can be rewritten as…”

Section: Grating-lobe Level Suppression Methods Based On Fresnel Inte...mentioning

confidence: 99%

“…Hence, its precision depends on the effective observation of the flight track, which includes the high-resolution measurement of the insects' height and the effective detection of the tiny insects from the background noise. For the detection of insects, several methods have been proposed and proven their robustness in operation [19][20][21][22][23][24]. For the high-resolution measurement of the insects, the current VLRs are all non-coherent and emit unmodulated pulses with the pulse width of 0.05 µs, 0.08 µs, or 0.1 µs, corresponding to the range resolution of 7.5, 12, or 15 m respectively [18,22,25].…”

Section: Introductionmentioning

confidence: 99%

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High-Resolution and Low Blind Range Waveform for Migratory Insects’ Taking-Off and Landing Behavior Observation

et al. 2022

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The observation of taking-off and landing behaviors of migratory insects is important for pest early monitoring and forecasting. Entomological radar, which can measure the ascent or descent rates remotely, has been proved to be the most effective way to observe the above behaviors. For the current entomological radars, the highest range resolution of 7.5 m and smallest blind range of 150 m make it difficult to distinguish individual insects in a swarm and observe the migratory behaviors at low altitudes. In this paper, based on the outfield data acquired from a high-resolution radar of 0.2 m, the spatial spacing distribution of migratory insects is presented for the first time and waveform design requirements are analyzed, proving the necessity of a higher resolution. Secondly, for the high-resolution and low blind range observation of insects, the stepped frequency train of LFM pulses (also called frequency-jumped burst, FJB) waveform is discussed as the optimal choice. In order to resolve the high grating-lobe problem in the FJB waveform with the low blind range, the precise spectrum model and its approximation of the LFM subpulse are first derived in detail. Then, according to the obtained spectrum characteristics, the high-resolution and low blind range FJB waveform design methods based on spectrum fluctuation period and Fresnel integral windowing are proposed to reduce the grating-lobe number to more than 50% and suppress the highest grating lobe level by at least 4 dB. Finally, based on the high-resolution and low blind range VLR adopting the proposed waveform, several typical taking-off and landing behavior observation results are presented, which proves that, in their migratory pattern, insects usually take off around sunset.

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Section: Grating-lobe Level Suppression Methods Based On Fresnel Inte...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Resolution and Low Blind Range Waveform for Migratory Insects’ Taking-Off and Landing Behavior Observation

et al. 2022

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“…Radar is an important remote sensing tool that has been widely used for aerial target observation [3][4][5]. The ability of radar to detect high-flying insects without interfering with their flight makes it one of the most efficient tools for studying insect migration.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of polarimetric radar cross-section parameters for insect body width and length estimation

Kong

et al. 2021

Sci. China Inf. Sci.

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Equivalent point estimation for small target groups tracking based on maximum group likelihood estimation

Cited by 2 publications

References 9 publications

High-Resolution and Low Blind Range Waveform for Migratory Insects’ Taking-Off and Landing Behavior Observation

High-Resolution and Low Blind Range Waveform for Migratory Insects’ Taking-Off and Landing Behavior Observation

Comprehensive analysis of polarimetric radar cross-section parameters for insect body width and length estimation

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