Fpga-Based Chirp Generator for High Resolution Uav Sar

Chua, Ming Yam; Koo, Voon Chet

doi:10.2528/pier09100301

Cited by 56 publications

(43 citation statements)

References 9 publications

(8 reference statements)

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“…Secondly, LFM pulses significantly reduce hardware complexity e.g., sampling frequency [9]. A LFM pulse can be generated in different methods like FPGA and DDS [18] and is formulated as follows [5,15]:…”

Section: Signal Propertiesmentioning

confidence: 99%

A Circular Synthetic Aperture Radar for on-the-Ground Object Detection

Mohammadpoor¹,

Abdullah²,

Ismail³

et al. 2012

PIER

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Abstract-Detecting an on-the-ground object is a subject of interest for use in some applications. Foreign Object Detection (FOD), which is an important issue in aviation safety, is a possible application. In this way, radar imaging, has several inherent advantages over other on-the-ground object detection techniques. This paper will introduce a ground-based Circular Synthetic Aperture Radar, which detects and localizes various objects, based on their reflection properties of microwaves. Here, wideband Linear Frequency Modulated (LFM) chirp pulses are employed for the transmission and reception of reflection pulses, both to and from the object under test. Once the pulses are received by the radar, a processing algorithm (proposed later in this paper) is executed to confirm detection. In order to verify the validity of the model, a prototype was developed and a series of field experiments was carried out. The results show that the proposed system has the ability to detect and localize on-the-ground objects with dimensions as small as 2 cm high and 1 cm diameter, located several metres away. Furthermore, the resolution of the system was analysed and results indicate that the system is capable of distinguishing multiple objects in close proximity to each other, which therefore, makes it suitable for FOD applications by some small modifications.

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Section: Signal Propertiesmentioning

confidence: 99%

A Circular Synthetic Aperture Radar for on-the-Ground Object Detection

Mohammadpoor¹,

Abdullah²,

Ismail³

et al. 2012

PIER

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“…Wideband coherent LFM pulses radar has combination advantages of wideband radar and coherent radar. Furthermore, it has a long coverage and low peak power, which produce a low probability of intercept and strong anti-interference performance [7]. As a result, wideband coherent LFM pulses radar has been widely used in terminal guidance.…”

Section: Introductionmentioning

confidence: 99%

Research on Vessel and Chaff Echo Characteristics for Wideband Coherent Radar

Liu¹,

Chang²

2013

PIER C

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Abstract-To study effective anti-chaff jamming methods, this paper investigates the echo characteristics of the vessel and the chaff for missile-borne wideband coherent radars. Firstly, the echo model of the missile-borne wideband coherent LFM pulses radar is built, and the range-Doppler image of the echoes is derived. Based on the measured data, the differences of the echoes between the vessel and the chaff are analyzed. Then in terms of the spread feature and energy evenness of the range-Doppler image, two features of the radar echoes are proposed to distinguish the vessel and chaff. Finally, statistical distributions of the two features are investigated, and we find that the proposed features can be used for chaff jamming identification and suppression.

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“…It has been shown in [25] that using digital devices, e.g., FPGA chip, to real-time generate chaotic noise signals is a good choice. However, the quantization length is usually very low in FPGA [26], which may destroy the chaotic property. Therefore, we proposed the combination chaotic map (CCM), which is insensitive to the quantization and can keep good chaotic property even though the quantization length is low [25,27].…”

Section: Introductionmentioning

confidence: 99%

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

Yang¹,

Zhang²,

Gu³

2015

PIER B

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Abstract-This paper proposes a burst model of chaotic noise signals with randomly stepped carrier frequencies for velocity estimation and high-resolution range imaging of high-speed moving targets. The random stepping of carrier frequencies is controlled by a combination chaotic map (CCM), which is generated by embedding a Logistic map into a Bernoulli map. The baseband noise signal adopts the CCM based frequency-modulation (CCM-FM) signal, which has good randomness and a thumbtack ambiguity function as well. The velocity estimation includes a coarse search and a precise search, where the coarse search is conducted with a fixed step to makes the velocity deviation less than the velocity resolution, while the precise search adopts the Golden Section Search (GSS) algorithm to get an accurate estimation of velocity. What should be emphasized is that the velocity estimation process can be completed with just a burst of subpulses. Then the spectra are coherently synthesized to obtain ultra-wide bandwidth and high-resolution range imaging. Finally, numerical simulations demonstrate a good performance of the proposed signal model and the processing algorithm.

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Fpga-Based Chirp Generator for High Resolution Uav Sar

Cited by 56 publications

References 9 publications

A Circular Synthetic Aperture Radar for on-the-Ground Object Detection

A Circular Synthetic Aperture Radar for on-the-Ground Object Detection

Research on Vessel and Chaff Echo Characteristics for Wideband Coherent Radar

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

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