The zoom FFT using complex modulation

Hoyer, Elmer A.; Stork, R.

doi:10.1109/icassp.1977.1170177

Cited by 43 publications

(17 citation statements)

References 7 publications

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“…In the case, where only a small set of frequency bins are required, Zoom-FFT [4]and Pre-weighted FFT [5] algorithms are known to reduce the computation complexity significantly. On the other hand, they inserts a systematic error (aliasing), which is too high for the subsequent processing in the PCL system.…”

Section: Algorithm Descriptionmentioning

confidence: 99%

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Using Reconfigurable HW for High Dimensional CAF Computation

Hermanek

Kuneš

Kvasnicka

2006

2006 International Conference on Field Programmable Logic and Applications

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In modern radio location systems based on passive coherent location (PCL), one of the key problems is an efficient and accurate computation of the cross ambiguity function (CAF). This function is related to the direct signal and signals reflected from localized targets. CAF represent power spectral density distribution of the cross-correlation between direct and reflected signals. In this paper we present an attempt to implement (numerically effective and sufficiently accurate) the CAF computation accelerator on FPGA. The results show that this accelerator could be used to compute CAF in real-time in the future PCL systems. The presented design has been implemented in PC accelerator cards based both on Xilinx Virtex IV and Altera Stratix II devices. The presented contribution gives overall information about the algorithms, accelerator architecture design and achieved performance. The possibilities of the future enhancements are discussed.

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Section: Algorithm Descriptionmentioning

confidence: 99%

“…We can see that up to a certain stage (column in data flow graph), all butterflies have to be calculated. This results in a computation of x [4] x[12]…”

Section: Algorithm Descriptionmentioning

confidence: 99%

Using Reconfigurable HW for High Dimensional CAF Computation

Hermanek

Kuneš

Kvasnicka

2006

2006 International Conference on Field Programmable Logic and Applications

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“…And the fast computing methods of the AF were proposed in refs. [2][3][4]. However, the bistatic geometry factors (BGFs) have the effects on the measurements in a passive radar.…”

Section: Introductionmentioning

confidence: 98%

BRVAAF and performance analysis for target detection

Zhang

Tao

Wang

2009

Sci. China Ser. E-Technol. Sci.

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A bistatic range-velocity-acceleration ambiguity function (BRVAAF) is proposed. The model of radar measurements of an accelerating target involving the time delay, Doppler frequency and Doppler rate is given. The relationships between these measurements and the parameters of the bistatic geometry, target position, velocity and acceleration are derived. Moreover, the effects of the bistatic geometry factors on these measurements are analyzed. Besides, the two relationships of the bistatic integration loss and the bistatic optimum integration time with these factors are built and their change trends are described respectively. This research is helpful to analyze the influences of the bistatic geometry factors on the target detection and signal processing.

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“…Its analysis process neglected the effect of twiddle factor, which would result in the distortions of some spectrum bins. Reference [2] has introduced the method of complex demodulation. The basic process of this method sequentially applies complex demodulation, low-pass filtering, down-sampling and FFT to the input signal.…”

Section: Introductionmentioning

confidence: 99%

Frame-overlapped Zoom-FFT Optimization in PD Radar Application

Fan

Sheng

Chen

et al. 2006

2006 CIE International Conference on Radar

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This paper addresses a frame-overlapped zoom-FFT method applied to Pulse Doppler (PD) radar echo spectrum analysis. The method can achieve high resolution of local spectrum, and improve the gain of coherent integration, so it can enhance the detection probability and the precision of parameter estimation for poor echo signal. Firstly this paper introduces the principal of frame-overlapped zoom-FFT. Then it addresses the parameter design criterions in high pulse repeat frequency (HPRF) PD radar application. Furthermore based on analyzing the effects on incoherent integration and target detection due to frame overlap, it illustrates the parameter design process by an example of PD radar spectrum analysis application and gives the comparison of overlap processing and no-overlap processing. Finally, a real-time spectrum analysis system implementation adopting the frame-overlapped zoom-FFT method is proposed.

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The zoom FFT using complex modulation

Cited by 43 publications

References 7 publications

Using Reconfigurable HW for High Dimensional CAF Computation

Using Reconfigurable HW for High Dimensional CAF Computation

BRVAAF and performance analysis for target detection

Frame-overlapped Zoom-FFT Optimization in PD Radar Application

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