Research on a Wind Lidar Without Blind Zone Based on the Technologies of Pseudo Random Code Phase Modulation and Heterodyne Detection

Yang, Fu; Liu, Zheng; Zhu, Xinhua

doi:10.1051/epjconf/202023706016

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Lantz et al proposed a series of new instantaneous information features combined with support vector machine classifiers to successfully complete the modulation identification of 12 kinds of digital signals [13]. Yang et al realized the modulation recognition of ASK, PSK, and FSK signals by improving the traditional instantaneous information features and increased the recog-nition rate by 15% under the same conditions [14]. In 2015, Bruyn and Gao applied multiorder cyclic cumulants to the classification of multiuser modulations [15].…”

Section: Literature Reviewmentioning

confidence: 99%

Modulation of Multichannel Electronic Communication Signal Parameters Based on a Nonlinear Phase Principle

Zhao

2022

Wireless Communications and Mobile Computing

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In order to solve the difficulty of the optical fiber communication system and network as the infrastructure of the global communication network, which is faced with the requirement of large capacity and high speed, the author proposes a method to modulate the parameters of multichannel electronic communication signals based on the nonlinear phase principle. The method includes multichannel electronic communication signal search, multichannel electronic communication signal parameter modulation, and multichannel electronic communication signal automatic acquisition algorithm realization. Experimental results show that under the conditions that the sampling frequency is set to f = 8.145 MHz, the length of the C/A code period is set to 1 ms, and the 1 ms data packet contains 8145 sampling points, under the same experimental conditions, the capture probability of this experiment reaches 100% and the traditional algorithm has a capture probability of up to 70%. Modulation of multichannel electronic communication signal parameters based on nonlinear phase principle has a positive guiding role in building a high-speed optical fiber communication system and network with long distance, large capacity, high elasticity, high reliability, and low delay.

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Section: Literature Reviewmentioning

confidence: 99%

Modulation of Multichannel Electronic Communication Signal Parameters Based on a Nonlinear Phase Principle

Zhao

2022

Wireless Communications and Mobile Computing

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“…Laser micro-Doppler detection also uses a heterodyne detection system of laser speed and distance measurement [ 29 ]. Using the laser heterodyne interference system in Figure 2 , the laser source is replaced with a single-frequency laser of 1064 nm.…”

Section: Analysis Of Parameter Decoupling and Extraction Based On Mic...mentioning

confidence: 99%

Decoupling and Parameter Extraction Methods for Conical Micro-Motion Object Based on FMCW Lidar

Yang,

Liu

et al. 2024

Sensors

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Micro-Doppler time–frequency analysis has been regarded as an important parameter extraction method for conical micro-motion objects. However, the micro-Doppler effect caused by micro-motion can modulate the frequency of lidar echo, leading to coupling between structure and micro-motion parameters. Therefore, it is difficult to extract parameters for micro-motion cones. We propose a new method for parameter extraction by combining the range profile of a micro-motion cone and the micro-Doppler time–frequency spectrum. This method can effectively decouple and accurately extract the structure and the micro-motion parameters of cones. Compared with traditional time–frequency analysis methods, the accuracy of parameter extraction is higher, and the information is richer. Firstly, the range profile of the micro-motion cone was obtained by using an FMCW (Frequency Modulated Continuous Wave) lidar based on simulation. Secondly, quantitative analysis was conducted on the edge features of the range profile and the micro-Doppler time–frequency spectrum. Finally, the parameters of the micro-motion cone were extracted based on the proposed decoupling parameter extraction method. The results show that our method can effectively extract the cone height, the base radius, the precession angle, the spin frequency, and the gravity center height within the range of a lidar LOS (line of sight) angle from 20° to 65°. The average absolute percentage error can reach below 10%. The method proposed in this paper not only enriches the detection information regarding micro-motion cones, but also improves the accuracy of parameter extraction and establishes a foundation for classification and recognition. It provides a new technical approach for laser micro-Doppler detection in accurate recognition.

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“…However, for the pulse coherent lidar, the blind zone crosstalk noise is much higher than the effective signal level, and the effectiveness of these methods in reducing crosstalk noise is quite limited. Yang et al [15] proposed to use the pseudo-phase coding technology to improve the distance resolution of the pulse CDWL system and proposed to solve the near-field blind zone problem. However the coding system has a lower magnitude of the power spectrum, compared with a non-coding system [16], so the effective detection distance of the coding system is limited.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Auxiliary Biaxial Receiver to Detect Blind Zone of Pulsed Coherent Wind Lidar

Zhao,

Yu,

Wang

et al. 2024

Preprint

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The conventional pulsed monostatic coaxial coherent Doppler wind lidar (CDWL) has a blind detection zone of tens of meters, causing the loss of near-field wind field data. We propose a novel auxiliary biaxial receiver (ABR) to obtain reliable coherent signals in the blind zones by adding a receiver near the monostatic coaxial transceiver (MCT) to avoid end-face reflections and tailing effects of laser pulses. A specific model of multiple aperture coherent wind detection is established for the ABR system without blind zone problem (BZP). The numerical simulations demonstrate that the biaxial receiver with reasonable design can meet the detection needs of the entire range of the blind zone. By using an ABR with a smaller focal length under appropriate transceiver pointing and general pointing accuracy, the BZP can be solved. The study also exhaustively obtained all parameter combinations that can solve the near-field BZP for a specific system. The results provide a new idea and engineering design guidance for the optical system design of pulsed CDWL without BZP.

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Research on a Wind Lidar Without Blind Zone Based on the Technologies of Pseudo Random Code Phase Modulation and Heterodyne Detection

Cited by 4 publications

References 2 publications

Modulation of Multichannel Electronic Communication Signal Parameters Based on a Nonlinear Phase Principle

Modulation of Multichannel Electronic Communication Signal Parameters Based on a Nonlinear Phase Principle

Decoupling and Parameter Extraction Methods for Conical Micro-Motion Object Based on FMCW Lidar

Optimization of Auxiliary Biaxial Receiver to Detect Blind Zone of Pulsed Coherent Wind Lidar

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