CN-121984613-A - Ultra-wideband channel characteristic photoelectric fusion measuring device

CN121984613ACN 121984613 ACN121984613 ACN 121984613ACN-121984613-A

Abstract

The invention discloses an ultra-wideband channel characteristic photoelectric fusion measuring device which is characterized by comprising a vector network analyzer, a measuring signal transmitting unit, a measuring signal receiving unit, a channel data acquisition and storage unit and an intelligent channel characteristic analyzing unit, wherein the vector network analyzer is used for generating sweep frequency signals according to start-stop frequency and sweep frequency points of ultra-wideband channel measurement, the measuring signal transmitting unit is used for transmitting ultra-wideband radio frequency measuring signals according to the sweep frequency signals, the measuring signal receiving unit is used for receiving the ultra-wideband radio frequency measuring signals transmitted through a wireless channel and obtaining frequency domain response data of the ultra-wideband radio frequency measuring signals through system response loss compensation, the channel data acquisition and storage unit is used for obtaining time domain response data according to the frequency domain response data and storing the frequency domain response data, and the intelligent channel characteristic analyzing unit is used for analyzing multi-dimensional ultra-wideband channel characteristics according to the frequency domain response data and the time domain response data. The invention supports ultra-wideband channel measurement of indoor and outdoor scenes and can accurately extract multidimensional channel parameters in the ultra-wideband channel.

Inventors

ZHU QIUMING
YANG YUXIN
Lei Taiya
HUA BOYU
TANG ZHENZHOU
LIN ZHIPENG
MAO KAI
MA ZHANGFENG
CHEN XIAOMIN

Assignees

南京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (9)

1. The ultra-wideband channel characteristic photoelectric fusion measuring device is characterized by comprising a vector network analyzer, a measuring signal transmitting unit, a measuring signal receiving unit, a channel data acquisition and storage unit and a channel characteristic intelligent analysis unit; the vector network analyzer is used for generating a sweep frequency signal according to the start-stop frequency and the sweep frequency point number measured by the ultra-wideband channel; the measuring signal transmitting unit is used for transmitting an ultra-wideband radio frequency measuring signal according to the sweep frequency signal; the measuring signal receiving unit is used for receiving ultra-wideband radio frequency measuring signals transmitted by an ultra-wideband channel and obtaining frequency domain response data of the ultra-wideband radio frequency measuring signals through system response loss compensation; the channel data acquisition and storage unit is used for acquiring time domain response data according to the frequency domain response data and storing the frequency domain response data and the time domain response data; the intelligent analysis unit of the channel characteristics is used for analyzing the multi-dimensional ultra-wideband channel characteristics according to the frequency domain response data and the time domain response data.
2. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 1, wherein the measurement signal transmitting unit comprises an electro-optical conversion module, a dispersion compensation module, an optical-electrical conversion module and a transmitting antenna; The electric-optical conversion module is used for converting the sweep frequency signal into a modulated optical signal and transmitting the modulated optical signal through an optical fiber; The dispersion compensation module is used for compensating the dispersion of the modulated optical signal in the optical fiber transmission process; the optical-electrical conversion module is used for restoring the compensated modulated optical signal into an ultra-wideband radio frequency measurement signal; The transmitting antenna is used for transmitting ultra-wideband radio frequency measurement signals.
3. The ultra-wideband channel characteristic photo-fusion measurement apparatus of claim 2, wherein the electro-optical conversion module comprises a radio frequency driver, a Mach-Zehnder modulator, a laser, and a bias controller; the radio frequency driver is used for amplifying the sweep frequency signal on each frequency point; The laser is used for generating an optical carrier wave; The Mach-Zehnder modulator is used for loading the sweep frequency signals amplified on each frequency point to an optical carrier, mapping the sweep frequency signals into the periodical change of light intensity along with time, and obtaining modulated optical signals; the bias controller is used for adjusting the bias point of the Mach-Zehnder modulator so that the Mach-Zehnder modulator works in a linear interval.
4. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 1, wherein the measurement signal receiving unit comprises a radio frequency switch, a receiving antenna array, a frequency domain data acquisition module and a system response compensation module; the receiving antenna array is used for receiving ultra-wideband radio frequency measurement signals propagated through an ultra-wideband channel; the radio frequency switch is used for controlling the switch of each antenna array element in the receiving antenna array; the frequency domain data acquisition module is used for acquiring ultra-wideband radio frequency measurement signals received by each antenna array element one by utilizing a radio frequency switch, and acquiring an initial frequency domain response signal of the ultra-wideband radio frequency measurement signals through dispersion parameters of the vector network analyzer; the system response compensation module is used for compensating the preliminary frequency domain response signal of the ultra-wideband radio frequency measurement signal by utilizing the static frequency response of the direct connection of the measurement signal transmitting unit and the measurement signal receiving unit, and obtaining the frequency domain response signal of the ultra-wideband radio frequency measurement signal.
5. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 1, wherein the channel data acquisition and storage unit comprises a channel impulse response extraction module and an upper computer; The channel impulse response extraction module is used for carrying out inverse Fourier transform on the frequency domain response data to obtain time domain response data; the upper computer is used for storing time domain response data and frequency domain response data of the ultra-wideband radio frequency measurement signals.
6. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 1, wherein the channel characteristic intelligent analysis unit comprises a path loss calculation module, a K factor calculation module and a multipath component extraction module; The path loss calculation module is used for calculating the path loss of the ultra-wideband radio frequency measurement signal in the ultra-wideband channel propagation process according to the frequency domain response data; The K factor calculation module is used for calculating the K factor of the ultra-wideband channel according to the frequency domain response data; The multipath component extraction module extracts effective multipath components in time domain response data of the ultra-wideband radio frequency measurement signal by setting an adaptive noise threshold value, and identifies a propagation path of an ultra-wideband channel.
7. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 6, wherein the calculation process of the K factor of the ultra-wideband channel is: Wherein, the Representing the K-factor of the ultra-wideband channel, Represents the power average of the frequency domain response data, , The number of the sweep frequency points is represented, Representation of Is used for the indexing of (a), Representing the first of the receiving antenna arrays The antenna array element is at the first The frequency domain response signal at each time instant, Representing the power variance of the frequency domain response data, 。
8. The ultra-wideband channel characteristic photoelectric fusion measurement device according to claim 6, wherein the channel characteristic intelligent analysis unit further comprises a phase acquisition module, a time delay acquisition module, a power acquisition module and a time delay expansion module; the phase acquisition module is used for acquiring the phase of each propagation path in the ultra-wideband channel according to the effective multipath component; the power acquisition module is used for acquiring the amplitude value of each propagation path in the ultra-wideband channel according to the effective multipath component; The delay acquisition module is used for acquiring the delay of each propagation path in the ultra-wideband channel according to the effective multipath component; the delay spread module is used for calculating the root mean square delay spread parameter of the ultra-wideband channel according to the delay of each propagation path in the ultra-wideband channel.
9. The ultra-wideband channel characteristic photoelectric fusion measurement apparatus of claim 8, wherein the channel characteristic intelligent analysis unit further comprises an angle parameter acquisition module for predicting an arrival angle of the non-line-of-sight path according to a non-line-of-sight path phase and a bandwidth among phases of the propagation path, and calculating a root mean square angle spread of the arrival angle according to the predicted arrival angle.

Description

Ultra-wideband channel characteristic photoelectric fusion measuring device Technical Field The invention belongs to the field of wireless information transmission, and particularly relates to an ultra-wideband channel characteristic photoelectric fusion measuring device. Background Along with the rapid development of digital economy, scenes such as intelligent life, intelligent travel and the like have higher requirements on the wireless data transmission rate and quality. Ultra wideband technology is considered as an important support technology towards the intelligent world due to its high data rate, low power consumption and strong multipath resistance. However, the characteristic analysis of the ultra wideband channel needs to be further researched and perfected, and in addition, the ultra wideband channel measurement and the measured data acquisition have some problems to be solved. The traditional channel measurement method comprises two types of time domain and frequency domain, and channel impulse response and channel transfer function are respectively obtained. The frequency domain measurement has good synchronism and is suitable for high frequency bands, but the measurement distance is short, and the time domain measurement is long, can capture instantaneous change, is suitable for outdoor, but has difficult synchronization and smaller broadband. Although the two are theoretically equivalent, errors are often introduced in the measurement process due to factors such as equipment response, system loss and the like, and the accuracy of the result is affected. In addition, the two traditional methods are directly applied to the measurement of the ultra-wideband channel, and have various limitations such as wideband, scene and precision. Disclosure of Invention Aiming at the problems in the prior art, the invention provides an ultra-wideband channel characteristic photoelectric fusion measuring device which supports ultra-wideband channel measurement of indoor and outdoor scenes and can accurately extract multidimensional channel parameters in an ultra-wideband channel. In order to achieve the technical purpose, the invention adopts the following technical scheme: The ultra-wideband channel characteristic photoelectric fusion measuring device comprises a vector network analyzer, a measuring signal transmitting unit, a measuring signal receiving unit, a channel data acquisition and storage unit and a channel characteristic intelligent analysis unit; the vector network analyzer is used for generating a sweep frequency signal according to the start-stop frequency and the sweep frequency point number measured by the ultra-wideband channel; the measuring signal transmitting unit is used for transmitting an ultra-wideband radio frequency measuring signal according to the sweep frequency signal; the measuring signal receiving unit is used for receiving ultra-wideband radio frequency measuring signals transmitted by an ultra-wideband channel and obtaining frequency domain response data of the ultra-wideband radio frequency measuring signals through system response loss compensation; the channel data acquisition and storage unit is used for acquiring time domain response data according to the frequency domain response data and storing the frequency domain response data and the time domain response data; the intelligent analysis unit of the channel characteristics is used for analyzing the multi-dimensional ultra-wideband channel characteristics according to the frequency domain response data and the time domain response data. Further, the measurement signal transmitting unit comprises an electric-optical conversion module, a dispersion compensation module, an optical-electric conversion module and a transmitting antenna; The electric-optical conversion module is used for converting the sweep frequency signal into a modulated optical signal and transmitting the modulated optical signal through an optical fiber; The dispersion compensation module is used for compensating the dispersion of the modulated optical signal in the optical fiber transmission process; the optical-electrical conversion module is used for restoring the compensated modulated optical signal into an ultra-wideband radio frequency measurement signal; The transmitting antenna is used for transmitting ultra-wideband radio frequency measurement signals. Further, the electro-optical conversion module comprises a radio frequency driver, a Mach-Zehnder modulator, a laser and a bias controller; the radio frequency driver is used for amplifying the sweep frequency signal on each frequency point; The laser is used for generating an optical carrier wave; The Mach-Zehnder modulator is used for loading the sweep frequency signals amplified on each frequency point to an optical carrier, mapping the sweep frequency signals into the periodical change of light intensity along with time, and obtaining modulated optical signals; the bias controller is used for