Application of two spectrum refinement methods in frequency estimation

Deng, Leilei; Leng, Kaijing

doi:10.1088/1742-6596/2290/1/012070

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Considering these factors, we present an improvement on the pre-weighted Zoom-FFT method for calculating the cross-ambiguity function. This approach retains the advantages of the Zoom-FFT method, reduces the signal length and limits the signal's spectral range to the vicinity of its actual frequency difference [29][30][31][32], thus reducing the number of FFT points from N to M for each time delay.…”

Section: Fast Calculation For Cafmentioning

confidence: 99%

High-Precision Joint TDOA and FDOA Location System

Xiao,

Dong,

Liao

et al. 2024

Remote Sensing

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Passive location based on TDOA (time difference of arrival) and FDOA (frequency difference of arrival) is the mainstream method for target localization. This paper proposes a fast time–frequency difference positioning method to address issues such as low accuracy, large computational resource utilization, and limited suitability for real-time signal processing in the conventional CAF (cross-ambiguity function)-based approach, aiming to complete the processing of the target radiation source to obtain the target parameters within a short timeframe. In the mixing product operation step of the CAF, a frequency-domain approach replaces the time-domain convolution operation in PW-ZFFT (pre-weighted Zoom-FFT) to reduce the computational load of the CAF. Additionally, a quadratic surface fitting method is used to enhance the accuracy of TDOA and FDOA. The localization solution is obtained using Newton’s method, which can provide more accurate results compared to analytical methods. Next, a signal processing platform is designed with FPGA (field-programmable gate array) and multi-core DSP (digital signal processor), and works by dividing and mapping the algorithm functional modules according to the hardware’s characteristics. We analyze the architectural advantages of multi-core DSP and design methods to improve program performance, such as EDMA transfer optimization, inline function optimization, and cache optimization. Finally, this paper constructs simulation tests in typical positioning scenarios and compares them to hardware measurement results, thus confirming the correctness and real-time capability of the program.

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Section: Fast Calculation For Cafmentioning

confidence: 99%