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WO2019200663A1 - Procédé de commande de faisceau basé sur une antenne réseau à diversité de fréquence - Google Patents

Procédé de commande de faisceau basé sur une antenne réseau à diversité de fréquence Download PDF

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Publication number
WO2019200663A1
WO2019200663A1 PCT/CN2018/088469 CN2018088469W WO2019200663A1 WO 2019200663 A1 WO2019200663 A1 WO 2019200663A1 CN 2018088469 W CN2018088469 W CN 2018088469W WO 2019200663 A1 WO2019200663 A1 WO 2019200663A1
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Prior art keywords
antenna
array
signal
antenna array
transmission
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PCT/CN2018/088469
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English (en)
Chinese (zh)
Inventor
李强
黄磊
周汉飞
赵博
孙维泽
许景新
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Shenzhen University
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Shenzhen University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to a beam control method based on a frequency diversity array antenna, and relates to the technical field of antenna arrays.
  • the base station transmitting station In the traditional satellite navigation carrier phase real-time dynamic differential (RTK, Real Time Kinematic) technology, the base station transmitting station usually adopts an ordinary omnidirectional antenna. Therefore, the anti-interference ability of the base station transmitting antenna is weak, and there is no directional gain function. If a phased array antenna is used, the antenna beam and the pointing shape can be quickly and flexibly changed in a set airspace, so that the gain in the desired target direction is maximized, and a null can be formed at the interference, thereby reducing the gain at the interference.
  • RTK Real Time Kinematic
  • phased array antennas have gradually received challenges.
  • the main lobe interference occurs, that is, the interference signal angle is the same as or close to the transmission signal angle, the phased array antenna will not be able to distinguish the desired signal from the interference signal, thereby suppressing the reception of the desired signal.
  • the emergence of frequency diversity array antennas has brought new ideas to solve the main lobe interference.
  • the literature “P.Antonik, MCWicks, HDGriffiths, and CJBaker, "Frequency diverse array radars," Proc. IEEE Radar Conf., pp. 215-217, Apr. 2006” was first proposed at the 2016 International Radar Conference. The concept of frequency diversity array antennas has since attracted the attention of many scholars in the radar field.
  • the Frequency Dividing Array Antenna introduces a linear frequency increment far smaller than the carrier frequency in the signal transmitted by each array element, so that the transmission frequencies of the antenna elements are different.
  • the frequency diversity array antenna can generate the steering vector which is two-dimensionally related to the angle and the distance by using the small frequency offset between the array elements, so that the beam pattern of the two dimensions of the airspace-distance domain can be formed. If the main lobe interference occurs, the difference between the desired signal and the interference signal to the target can be utilized, so that the main dimension interference suppression can be effectively realized by using the distance dimension zero point of the transmission pattern of the frequency diversity array antenna.
  • this conventional frequency diversity array antenna pattern has a periodic characteristic in the distance dimension, thereby reducing the received signal power at the target.
  • scholars W.Khan, IMQureshi, and S.Saeed Frequency (Diverse array radar with logarithmically increasing frequency offset, IEEE Antennas Wireless Propag. Lett., vol. 14, pp. 499-502, Feb, 2015)
  • a logarithmic frequency offset FDA antenna is proposed. This approach designs the frequency offset to be in the form of a logarithmic distribution to eliminate periodicity in the FDA pattern distance dimension.
  • the main pattern of the pattern formed by this method is wider, which amplifies the noise power, thereby reducing the signal-to-interference ratio of the FDA antenna output.
  • the present invention aims to provide a user with a frequency diversity array antenna-based beam control method, which overcomes the periodic defect in the beam emission distance dimension in the prior art, and enhances the target location. Signal reception power.
  • the invention provides a beam control method based on a frequency diversity array antenna, which comprises:
  • Step A setting a transmission frequency offset of each antenna array element in the antenna array to a uniform distribution, and establishing a random frequency offset antenna array transmission signal model;
  • Step B Calculate a received signal model at the desired target spatial location according to spatial location information of the desired target;
  • Step C Obtain a steering vector of the antenna array transmit signal reaching the desired target spatial position according to the received signal model, and calculate a weight coefficient of each antenna array element in the antenna array according to the steering vector;
  • Step D According to the weight coefficient of each antenna element, control the transmission of the signal of each antenna element to form a beam.
  • the random frequency offset antenna array transmitting signal model in step A is:
  • x m (t) represents the transmitted signal at time t on the mth antenna element
  • w m represents the weight coefficient on the mth antenna element
  • ( ⁇ ) H represents conjugate transpose
  • t represents signal At the time of transmission
  • T represents the signal transmission interval
  • f m represents the carrier frequency of the transmitted signal on the mth antenna element.
  • the transmit signal carrier frequency is expressed as:
  • f 0 is the reference carrier frequency
  • ⁇ f is a fixed carrier frequency offset
  • ⁇ f is much smaller than f 0
  • ⁇ m ⁇ U(0, 1) is expressed as a uniform distribution between 0 and 1.
  • the received signal model at the desired target spatial location in step B is:
  • R 0 and ⁇ 0 represent the distance and angle of arrival of the desired target spatial position to the reference array element of the antenna array, respectively, and R m represents the distance at which the desired target spatial position reaches the mth antenna element.
  • the weight coefficients of the respective antenna array elements calculated according to the steering vector in step C are:
  • w m is the weight coefficient on the mth antenna element
  • d is the spacing between two adjacent antenna elements
  • ⁇ 0 is the wavelength of the reference signal
  • the method provided by the present invention is based on the fact that the frequency diversity array antenna is a conventional FDA antenna, and the frequency offset is set to a uniform distribution, which can effectively eliminate the periodicity in the distance dimension of the antenna array element beam transmission process. Thereby enhancing the signal reception power at the target.
  • FIG. 1 is a flow chart showing the steps of a beam diversity array antenna based beam steering method provided by the present invention
  • 3 is a beam pattern obtained in the beam steering method provided by the present invention.
  • the invention employs a random frequency offset method.
  • the embodiment provided by the present invention is a beam control method based on a frequency diversity array antenna. As shown in FIG. 1 , the steps of the beam control method include:
  • Step S1 setting a transmission frequency offset of each antenna array element in the antenna array to a uniform distribution, and establishing a random frequency offset antenna array transmission signal model.
  • the carrier frequency of the transmitted signal on the mth antenna element is:
  • f 0 is the reference carrier frequency
  • ⁇ f is a fixed carrier frequency offset
  • ⁇ f is negligible compared to f 0 . It should be noted that ⁇ f will affect the pattern distribution of the frequency diversity antenna in the distance dimension.
  • the invention employs a random frequency offset method.
  • the uniform line matrix method of M array elements is also used, and the carrier frequency of the transmitted signal on the mth antenna array element is expressed as:
  • ⁇ m to U (0, 1) are expressed as a uniform distribution between 0 and 1.
  • the transmitted signal of the mth antenna element at time t can be expressed as:
  • w m represents the weight coefficient on the mth antenna element
  • ( ⁇ ) H represents the conjugate transposition operation
  • t represents the signal transmission timing
  • T represents the signal transmission interval.
  • Step S2 Calculate a received signal model at the desired target spatial location according to spatial location information of the desired target.
  • d is the spacing between two adjacent elements, expressed as:
  • c represents the speed of light
  • the target received signal model can be expressed as:
  • ⁇ 0 is the wavelength of the reference signal
  • the target received signal model can be obtained as:
  • Step S3 Calculate a received signal model at the desired target spatial location according to spatial location information of the desired target.
  • the weight coefficients on the array antenna elements need to be designed.
  • equation (8) we can get the steering vector at which the array antenna transmits a signal to the target.
  • Step S4 Control the transmission of the signal transmission of each antenna array element according to the weight coefficient of each antenna array element to form a beam.
  • the transmission control of the antenna element transmitting signal is performed, and the beam can be obtained at the spatial position of the desired target.
  • R and ⁇ are the arbitrary distances and spatial angles that the array antenna can detect, respectively.
  • the above formula (13), that is, the beam pattern and the distance and spatial angle functions, are simulated and simulated, and a beam pattern diagram as shown in FIG. 3 can be obtained.
  • the present invention introduces a random frequency offset method and proposes a direction map design method based on frequency offset array.
  • the invention introduces a random frequency offset antenna array into a satellite navigation RTK base station transmitting station, flexibly controls the direction of the RTK base station transmitting antenna, and eliminates the periodicity in the distance dimension in the FDA pattern, and enhances the signal receiving at the target. power.
  • the array antenna adopts a uniform line array
  • the number of array elements is 10
  • the angle of arrival of the incident signal and the distance are 0° and 100 km
  • 2 and 3 are respectively a pattern obtained by a conventional frequency diversity array beam pattern and a frequency diversity array antenna based beam control method.
  • both methods can form a main beam at the target.
  • the main lobe of the beam pattern in Figure 2 has significant periodic characteristics in the distance dimension, while this is not the case in Figure 3, thereby enhancing the received signal power at the target.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

La présente invention concerne un procédé de commande de faisceau basé sur une antenne réseau à diversité de fréquence. Le procédé consiste à : établir un modèle de signal de transmission de réseau d'antennes à décalage de fréquence aléatoire via la configuration d'un décalage de fréquence de transmission de chaque signal de transmission d'élément de réseau d'antennes d'un réseau d'antennes devant être distribué uniformément ; calculer, d'après des informations de position spatiale d'une cible souhaitée, un modèle de signal de réception au niveau d'une position spatiale cible souhaitée ; calculer un coefficient de pondération de chaque élément d'antenne du réseau d'antennes d'après le modèle de signal de réception ; et, d'après le coefficient de pondération de chaque élément d'antenne, commander la transmission de chaque signal de transmission d'élément de réseau d'antennes de sorte à former un faisceau. Dans le procédé selon l'invention, des décalages de fréquence sont configurés pour être distribués uniformément sur la base d'une antenne à diversité de fréquence classique, ce qui permet d'éliminer efficacement la périodicité de dimensions de distance durant un processus de transmission de faisceau des éléments de réseau d'antennes et d'améliorer ainsi la puissance de réception de signal au niveau de la cible.
PCT/CN2018/088469 2018-04-19 2018-05-25 Procédé de commande de faisceau basé sur une antenne réseau à diversité de fréquence Ceased WO2019200663A1 (fr)

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CN201810352129.7A CN108880647B (zh) 2018-04-19 2018-04-19 一种基于频率分集阵列天线的波束控制方法

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CN111679249B (zh) * 2020-06-05 2023-07-21 南京航空航天大学 一种基于射频隐身的频控阵雷达辐射功率控制方法
CN113923087B (zh) * 2021-09-01 2024-05-10 之江实验室 基于特定天线阵列切换顺序的载波频率偏移误差消除方法及系统
CN113660012B (zh) * 2021-09-28 2022-09-23 南京航空航天大学 基于随机频率分集阵列的距离敏感局部涡旋波产生方法
CN113992253B (zh) * 2021-10-28 2024-10-01 阳光学院 一种波束指向轨迹可控频控阵波束合成方法
CN116668243A (zh) * 2023-06-02 2023-08-29 哈尔滨工业大学 一种基于fda与随机码结合的波形设计及传输方法

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