Novel acquisition of global positioning system signals based on parameter prediction and the chirp z-transform

Xu, Bing; Li, Dou

doi:10.1177/0954410016652151

Cited by 3 publications

(8 citation statements)

References 22 publications

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“…For comparison with results in [6], we also set the down‐sampling rate D as 100 and executed 100 runs for each CNR. Table 1 lists the mean absolute error (MAE) of Doppler frequency and code delay under different CNRs and different coherent integration times.…”

Section: Results and Analysismentioning

confidence: 99%

“…Results show that a better accuracy is achieved with longer coherent integration time. Besides, signals with CNR down to 22 dB‐Hz can be acquired, namely, a better acquisition sensitivity is obtained, compared with 31 dB‐Hz in [6].…”

Section: Results and Analysismentioning

confidence: 99%

“…Fig. 1 shows the block diagram of the CZT‐based acquisition proposed in [6], which is modified for I/Q input signals.

\overset{false^}{τ}

and

{\hat{f}}_{normald}

are the predicted values for code delay and Doppler frequency.…”

Section: Signal Model and Czt‐based Acquisitionmentioning

confidence: 99%

“…In [6], a novel acquisition scheme is proposed which is based on parameter prediction and chirp z-transform (CZT), where the code delay and Doppler frequency are first predicted and then refined in a limited range using CZT. This algorithm can achieve a high-frequency resolution, but it is sensitive to the low carrier-to-noise ratio (CNR).…”

mentioning

confidence: 99%

“…Fig. 1 shows the block diagram of the CZT-based acquisition proposed in [6], which is modified for I/Q input signals.t andf d are the predicted values for code delay and Doppler frequency. After multiplied with the locally generated carrier and PRN code, the data sequence on the I branch (Q branch has a similar formula, thus not shown for simplicity) is…”

mentioning

confidence: 99%

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Benefits of long coherent integration for CZT‐based GPS signal acquisition

Dou

2018

Electron. lett.

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Due to its flexibility in calculating frequency spectrum, the chirp z-transform (CZT) has been used in various applications where high-frequency resolution is desirable, e.g. the acquisition of global positioning system (GPS) signals. However, the CZT is very time consuming when dealing with the very large size of input data. Thus, typically, only 1 ms data is used for GPS signal acquisition. In this Letter, the authors improve the acquisition precision and sensitivity of the CZT-based acquisition by extending coherent integration time. To reduce computation load, they introduce a down-sampling operation to the extended data without degrading acquisition performance. Results show that the CZT-based acquisition with a coherent integration time of 10 ms obtains a frequency error of 5.9 Hz for the carrier-to-noise ratio (CNR) of 25 dB-Hz and can acquire signals with a CNR down to 22 dB-Hz.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

“…Fig. 1 shows the block diagram of the CZT‐based acquisition proposed in [6], which is modified for I/Q input signals.

\overset{false^}{τ}

and

{\hat{f}}_{normald}

are the predicted values for code delay and Doppler frequency.…”

Section: Signal Model and Czt‐based Acquisitionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Benefits of long coherent integration for CZT‐based GPS signal acquisition

Dou

2018

Electron. lett.

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Research on high performance combustible gas concentration sensor based on pyramid beam splitter matrix

Wang,

Zhao,

Zhang

et al. 2024

PLoS ONE

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Combustible gas concentration detection faces challenges of increasing accuracy, and sensitivity, as well as high reliability in harsh using environments. The special design of the optical path structure of the sensitive element provides an opportunity to improve combustible gas concentration detection. In this study, the optical path structure of the sensitive element was newly designed based on the Pyramidal beam splitter matrix. The infrared light source was modulated by multi-frequency point signal superimposed modulation technology. At the same time, concentration detection results and confidence levels were calculated using the 4-channel combustible gas concentration detection algorithm based on spectral refinement. Through experiment, it is found that the sensor enables full-range measurement of CH4, at the lower explosive limit (LEL, CH4 LEL of 5%), the reliability level is 0.01 parts-per-million (PPM), and the sensor sensitivity is up to 0.5PPM. The sensor is still capable of achieving PPM-level detections, under extreme conditions in which the sensor’s optical window is covered by 2/3, and humidity is 85% or dust concentration is 100mg/m3. Those improve the sensitivity, robustness, reliability, and accuracy of the sensor.

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Research on High Performance Methane Gas Concentration Sensor Based on Pyramid Beam Splitter Matrix

Wang,

Zhao,

Zhang

et al. 2024

Sensors

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Methane gas concentration detection faces the challenges of increasing accuracy and sensitivity, as well as high reliability in harsh environments. The special design of the optical path structure of the sensitive element provides an opportunity to improve methane gas concentration detection. In this study, the optical path structure of the sensitive element was newly designed based on the Pyramidal beam splitter matrix. The infrared light source was modulated by multi-frequency point-signal superimposed modulation technology. At the same time, concentration detection results and confidence levels were calculated using the four-channel methane gas concentration detection algorithm based on spectral refinement. Through the experiment, it was found that the sensor enables the full-range measurement of CH4; at the lower explosive limit (LEL, CH4 LEL of 5%), the reliability level is 0.01 parts-per-million (PPM), and the limit of detection is 0.5 ppm. The sensor is still capable of achieving PPM-level detections under extreme conditions in which the sensor’s optical window is covered by two-thirds and humidity is 85% or dust concentration is 100 mg/m3. Those improve the sensitivity, robustness, reliability, and accuracy of the sensor.

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Novel acquisition of global positioning system signals based on parameter prediction and the chirp z-transform

Cited by 3 publications

References 22 publications

Benefits of long coherent integration for CZT‐based GPS signal acquisition

Benefits of long coherent integration for CZT‐based GPS signal acquisition

Research on high performance combustible gas concentration sensor based on pyramid beam splitter matrix

Research on High Performance Methane Gas Concentration Sensor Based on Pyramid Beam Splitter Matrix

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