CN113933830A - Multi-station dual-mode PCL/active radar networking system and positioning method - Google Patents

Multi-station dual-mode PCL/active radar networking system and positioning method Download PDF

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Publication number
CN113933830A
CN113933830A CN202111144500.9A CN202111144500A CN113933830A CN 113933830 A CN113933830 A CN 113933830A CN 202111144500 A CN202111144500 A CN 202111144500A CN 113933830 A CN113933830 A CN 113933830A
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signal
target object
radar
position information
passive
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熊伟
宋杰
崔亚奇
徐从安
张财生
陈小龙
王国庆
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Naval Aeronautical University
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Naval Aeronautical University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/42—Diversity systems specially adapted for radar

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention provides a multi-station dual-mode PCL/active radar networking system and a positioning method, wherein the system comprises: a passive radar mesh comprising a plurality of passive radars for receiving a target signal and deriving a plurality of first position information and first attitude information of a target object corresponding to each passive radar based on the target signal, the target signal comprising at least one of: the method comprises the following steps of (1) radiating signals of a target object, direct wave signals of a radiation source and reflected echo signals of the target object; the network center is used for obtaining second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the plurality of target objects; the multi-station dual-mode PCL/active radar networking system and the positioning method provided by the embodiment of the invention enrich the positioning modes of the target object and realize the accurate positioning of the target object.

Description

Multi-station dual-mode PCL/active radar networking system and positioning method
Technical Field
The invention relates to the technical field of radar positioning, in particular to a multi-station dual-mode PCL/active radar networking system and a positioning method.
Background
In the future informatization war, the requirement of combined operation cannot be met only by using a single radar and radar countermeasures or simply combining and superposing the radar and the countermeasures. In the air defense combat in modern cities or military places, the following problems are faced: 1) the single large active radar has accurate positioning and high reliability on a high-altitude target, but has the problems of larger low-altitude blind area, limited detection range and the like when facing low altitude, slow speed and small targets, 2) a plurality of small node radars are utilized for networking, although the airspace of the large radar can be equivalently covered, the large radar is limited by the prior art, the single base radar networking is mainly used, the detection and data and information fusion of the target are stopped on a target layer, the data fusion of a signal layer is difficult to achieve, and the identification capability of the target is not obviously improved compared with that of the single base radar; 3) the traditional Passive radar can only find a radiation source target but cannot find an electromagnetic silence target, and the traditional PCL (Passive Coherent Location) radar with an external radiation source mainly works in a broadcast/television frequency band, is low in positioning accuracy and is difficult to cover a medium-high-altitude target.
Disclosure of Invention
The invention provides a multi-station dual-mode PCL/active radar networking system and a positioning method, which are used for solving the technical problems in the prior art.
The invention provides a multi-station dual-mode PCL/active radar networking system, which comprises: a passive radar mesh comprising a plurality of passive radars for receiving a target signal and deriving a plurality of first position information and first attitude information of a target object corresponding to each passive radar based on the target signal, the target signal comprising at least one of: the method comprises the following steps of (1) radiating signals of a target object, direct wave signals of a radiation source and reflected echo signals of the target object;
the network center is used for obtaining second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the plurality of target objects;
when the passive radar net is in an electronic reconnaissance positioning mode, the passive radar net is used for receiving a radiation signal of the target object;
and when the passive radar net is in a passive coherent positioning mode, the passive radar net is used for receiving the direct wave signal of the radiation source and the reflected echo signal of the target object.
According to the multi-station dual-mode PCL/active radar networking system provided by the invention, the radar networking system further comprises: an active radar to send a pulse signal to a target area.
According to the multi-station dual-mode PCL/active radar networking system provided by the invention, the passive radar comprises:
the antenna system is used for receiving the radiation signal and/or the reflected echo signal of the target object;
the receiving system is used for carrying out frequency conversion, amplification and filtering processing on the received radiation signals and/or the reflected echo signals of the target object to obtain analog signals;
the signal acquisition and processing system is used for obtaining first position information and first attitude information of the target object based on the analog signal;
and the power supply system is used for supplying power to the passive radar.
The invention also provides a positioning method, which comprises the following steps: when the passive radar network is in a cooperative bistatic receiving mode, the active radar sends a pulse signal to a target area;
the active radar and the passive radar network receive a reflected echo signal of a target object and obtain first position information and first attitude information of the target object based on the pulse signal and the reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
The invention also provides a positioning method, which comprises the following steps: when the passive radar network is in an electronic reconnaissance positioning mode, the passive radar network receives a radiation signal of a target object and obtains first position information and first attitude information of the target object based on the radiation signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
The invention also provides a positioning method, which comprises the following steps: when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflected echo signal as well as a non-cooperative radar pulse signal and a corresponding second reflected echo signal, and obtains first position information and first attitude information of the target object based on the broadcast/television direct wave signal, the first reflected echo signal, the non-cooperative radar pulse signal and the second reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
According to a positioning method provided by the present invention, the acquiring position information and state information of a target object based on the broadcast/television direct wave signal, the first reflected echo signal, the non-cooperative radar pulse signal, and the second reflected echo signal specifically includes:
the passive radar network carries out signal reconstruction processing on the broadcast/television direct wave signal and the non-cooperative radar pulse signal to obtain a direct wave reference signal;
modifying the first reflection echo signal and the second reflection echo signal by using the direct wave reference signal to obtain a reflection echo reference signal;
obtaining first position information and first attitude information of the target object based on the direct wave reference signal and the reflected echo reference signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
The invention also provides a positioning method, which comprises the following steps: when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflection echo signal and obtains first position information and first attitude information of the target object based on the broadcast/television direct wave signal and the corresponding first reflection echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
The invention also provides a positioning method, which comprises the following steps: when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a non-cooperative radar pulse signal and a corresponding second reflected echo signal and obtains first position information and first attitude information of the target object based on the non-cooperative radar pulse signal and the corresponding second reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
According to the multi-station dual-mode PCL/active radar networking system and the positioning method, a multi-mode passive radar network is constructed, so that the passive radar network receives various types of signals, the selectable modes of the passive radar network comprise an electronic reconnaissance positioning mode, a passive coherent positioning mode and a cooperative bistatic receiving mode, and different positioning modes can be selected to realize a positioning process of a target object in combination with an actual application scene; based on the method, the positioning modes of the target object are enriched, and the target object is accurately positioned.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a multi-station dual-mode PCL/active radar networking system provided by the present invention;
FIG. 2 is a schematic diagram of a passive radar provided by the present invention;
FIG. 3 is a flow chart of a positioning method according to the present invention;
FIG. 4 is a second schematic flowchart of a positioning method according to the present invention;
FIG. 5 is a third schematic flow chart of a positioning method according to the present invention;
FIG. 6 is a fourth schematic flowchart of a positioning method provided by the present invention;
FIG. 7 is a fifth flowchart illustrating a positioning method according to the present invention;
FIG. 8 is a flowchart of a dual-mode PCL integration processing algorithm provided by the present invention;
FIG. 9 is one of application diagrams of a multi-station dual-mode PCL/active radar networking system provided by the present invention;
FIG. 10 is a second schematic diagram of an application of the multi-station dual-mode PCL/active radar networking system provided by the present invention;
FIG. 11 is a third schematic diagram of an application of the multi-station dual-mode PCL/active radar networking system provided by the present invention;
fig. 12 is a second schematic structural diagram of the multi-station dual-mode PCL/active radar networking system provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a multi-station dual-mode PCL/active radar networking system provided in the present invention, and as shown in fig. 1, the system includes:
a passive radar mesh comprising a plurality of passive radars for receiving a target signal and deriving a plurality of first position information and first attitude information of a target object corresponding to each passive radar based on the target signal, the target signal comprising at least one of: the method comprises the following steps of (1) radiating signals of a target object, direct wave signals of a radiation source and reflected echo signals of the target object;
the network center is used for obtaining second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the plurality of target objects;
when the passive radar net is in an electronic reconnaissance positioning mode, the passive radar net is used for receiving a radiation signal of the target object;
and when the passive radar net is in a passive coherent positioning mode, the passive radar net is used for receiving the direct wave signal of the radiation source and the reflected echo signal of the target object.
It should be noted that the passive radar network is composed of a plurality of passive radars, the specific arrangement mode of the plurality of passive radars can be flexibly arranged according to actual requirements, the passive radar is a radar which detects a target by receiving microwave energy reflected by a warm object or other sources without transmitting energy by a transmitter, and the passive radar is provided with an antenna and a receiving device with extremely high sensitivity. The passive radar network can be used for receiving a radiation signal of a target object, a direct wave signal of a radiation source and a reflected echo signal of the target object.
In the invention, the position information of the target object detected by a single passive radar is called first position information, the obtained attitude information of the target object is called first attitude information, and the first position information and the first attitude information of a plurality of target objects corresponding to a plurality of passive radars are subjected to data fusion through a network center to output the final position information and the final attitude information of the target object, which are called second position information and second attitude information of the target object. Data fusion refers to an information processing technology that uses a computer to automatically analyze and synthesize a plurality of observation information obtained according to time sequence under a certain criterion so as to complete needed decision and evaluation tasks. The position information of the target object refers to the distance and the orientation of the target object, and the posture information refers to the moving speed and the acceleration of the target object. The system detects and positions the target by measuring the direct wave of the emitted signal of the external radiation source and the arrival time difference, the arrival direction and the Doppler frequency shift of the reflected signal of the target. The main purpose of dual-mode PCL integration processing is to obtain the target bistatic distance (arrival time difference) and Doppler frequency; the target bistatic distance can be converted into a linear distance of the target relative to the receiving station by solving the bistatic triangular relation; the azimuth angle of the target relative to the receiving station can be obtained when the target is aligned to the target through a directional antenna of the receiving station; the azimuth angle of the target relative to the transmitting station can be estimated by estimating the antenna scanning angle of the transmitting station; the velocity is solved by Doppler frequency.
The network center is a command control and information fusion center of a radar networking system, specifically consists of a passive receiver and a set of central control processing system, and has the basic work functions of a passive radar station, and also has the functions of pivot, data transmission, management, control and the like.
The passive radar network has multiple signal receiving modes which can be selected, a target object can be positioned in different modes according to different application scenes, when the target object carries a radiation source, an electronic reconnaissance positioning mode can be selected, and the passive radar network is used for receiving the radiation signal of the target object in the mode; when the target object belongs to an electromagnetic silent target, i.e. the target object itself does not carry a radiation source, a passive coherent positioning mode may be selected in which the passive radar network is used to receive the direct wave signal of the radiation source and the reflected echo signal of said target object, wherein the radiation source represents a tv/broadcast signal tower for transmitting tv/broadcast signals and a non-cooperative radar for transmitting pulsed signals.
According to the multi-station dual-mode PCL/active radar networking system, a multi-mode passive radar network is constructed, the passive radar network receives various types of signals, the working mode of the passive radar network can be switched into an electronic reconnaissance positioning mode for a target object carrying a radiation signal, a passive coherent positioning mode can be selected to execute a positioning process for the target object not carrying the radiation signal, and the positioning process for the target object can be realized by selecting different positioning modes in combination with an actual application scene; based on the method, the positioning modes of the target object are enriched, and the target object is accurately positioned.
According to the multi-station dual-mode PCL/active radar networking system provided by the invention, in the invention, the radar networking system further comprises: an active radar to send a pulse signal to a target area.
The active radar is a radar having both beam transmitting capability and reflected echo receiving capability, and has the advantages of having an excellent positioning effect on objects at middle and high altitudes, but has the disadvantage of large blind area when facing low altitude, low speed and small targets.
According to the multi-station dual-mode PCL/active radar networking system, the new radar networking system is formed by the active radar, the passive radar network and the network center, so that the system has the autonomous beam transmitting capability, and meanwhile, the full-range echo receiving of the upper layer, the middle layer and the lower layer of a target airspace is realized.
Fig. 2 is a schematic structural diagram of a passive radar provided in the present invention, and as shown in fig. 2, the passive radar includes:
the antenna system is used for receiving the radiation signal and/or the reflected echo signal of the target object;
the receiving system is used for carrying out frequency conversion, amplification and filtering processing on the received radiation signals and/or the emission echo signals of the target object to obtain analog signals;
the signal acquisition and processing system is used for obtaining first position information and first attitude information of the target object based on the analog signal;
and the power supply system is used for supplying power to the passive radar.
It should be noted that the antenna system adopts a multiband array antenna, including a direct wave antenna unit and an echo antenna unit; the direct wave antenna unit receives the radiation signal of the transmitter and only outputs 1 path, and the echo antenna unit receives the target reflection echo data, adopts a one-dimensional array form, and is divided into a plurality of sub-arrays in the direction to simultaneously receive and output. Aiming at non-cooperative radar external radiation sources in broadcast/television frequency bands (such as UHF/VHF bands) and different frequency bands (such as L, S bands), the antenna is designed to have multi-band signal receiving capability. The antenna needs a directional high-efficiency antenna, and is designed by adopting a waveguide array antenna.
The receiving system comprises a signal frequency conversion unit, a clock and a local oscillator unit, wherein the signal frequency conversion unit transmits a plurality of paths of signals received by the antenna to the signal acquisition and processing subsystem after down-conversion, amplification and filtering, and the clock and the local oscillator generate various reference clock signals.
The signal acquisition and processing system comprises a signal acquisition unit (AD), a signal processing unit, a main control unit and an interface unit; the main control unit resolves various commands and parameters and controls each subsystem to work normally according to a set time sequence; the signal acquisition unit is used for converting the analog signals into baseband digital signals, and the signal processing unit is used for processing the baseband digital signals into first position information and first attitude information of a target object. It should be noted that the signal processing unit includes a dual-mode PCL integrated processing module, and the module comprehensively utilizes two types of high-quality illumination signals, namely broadcast/television signals and non-cooperative radar, and simultaneously realizes the detection functions of broadcast television PCL and radar PCL in the passive radar receiver.
According to the multi-station dual-mode PCL/active radar networking system, the direct wave antenna unit and the echo antenna unit are utilized to form the antenna system, so that the antenna system has the receiving capability of simultaneously receiving a radiation signal and a reflected echo signal, meanwhile, an analog signal output by the receiving system is processed by means of the information acquisition and processing system, and finally, first position information and first posture information of a target object are obtained, and accurate acquisition of positioning information of the target object is realized; and the power supply system can effectively ensure the requirement of the passive radar on electric power in the working process.
Fig. 3 is a schematic flow chart of a positioning method provided in the present invention, and as shown in fig. 3, the positioning method includes:
s110, when the passive radar network is in a cooperative bistatic receiving mode, the active radar sends a pulse signal to a target area;
s120, the active radar and the passive radar network receive a reflected echo signal of a target object and obtain first position information and first attitude information of the target object based on the pulse signal and the reflected echo signal;
s130, the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
It should be noted that, the cooperative bistatic receiving mode indicates that the reflected echo of the target object is received by the active radar and the passive radar network at the same time, in the embodiment of the present invention, the working process of the radar networking system is as follows: the active radar transmits pulse signals to a target area, and then the active radar and the passive radar net are used for resisting the target objectThe method comprises the steps of receiving echo signals in real time, obtaining first position information and first attitude information of a target object based on pulse signals of an active radar and received reflected echo signals, enabling a master station radar to work in a T/R mode, enabling N node radars to work in a passive receiving mode, and enabling the master station radar and the node radars to form the T/R-R modeNIn the process, a plurality of passive radars in the passive radar network are paired with the active radar, the three-dimensional reflection echo signal of the airspace where the target object is located is received based on the pairing process, and finally, the network center performs data fusion processing on the first position information and the first attitude information of the target object output by each passive radar in the passive radar network to obtain the second position information and the second attitude information of the target object.
Fig. 9 is one of application schematic diagrams of the multi-station dual-mode PCL/active radar networking system provided in the present invention, where the application schematic diagram of the radar networking system corresponds to a flowchart of the positioning method provided in the embodiment of the present invention.
According to the positioning method provided by the invention, the active radar transmits a pulse signal to the target area, and then the active radar and the passive radar network receive the reflected echo signal of the target object, so that the positioning process realizes the full-range reflected echo reception of the upper layer, the middle layer and the lower layer of a target airspace, and based on the full-range reflected echo reception, the strength of the radar networking system on the positioning signal of the target object is improved, and the positioning range of the target area is expanded.
Fig. 4 is a second schematic flow chart of the positioning method provided by the present invention, as shown in fig. 4, the positioning method includes:
s210, when a passive radar network is in an electronic reconnaissance positioning mode, the passive radar network receives a radiation signal of a target object and obtains first position information and first attitude information of the target object based on the radiation signal;
s220, the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
It should be noted that the electronic reconnaissance positioning mode refers to a passive radar network that realizes a positioning process of a target object by detecting a radiation source on the target object, where the radiation source may specifically be an active radar installed on an aircraft, and in the embodiment of the present invention, the working process of the radar networking system is as follows: the passive radar network receives a radiation signal of an object and obtains first position information and first attitude information of a target object based on the radiation signal, and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object output by a plurality of passive radars in the passive radar network.
Fig. 10 is a second application schematic diagram of the multi-station dual-mode PCL/active radar networking system provided in the present invention, where the application schematic diagram of the radar networking system corresponds to a flow schematic diagram of the positioning method provided in the embodiment of the present invention.
According to the positioning method provided by the invention, the passive radar network is placed in the electronic reconnaissance positioning mode, and the positioning process is carried out on the object carrying the radiation source, so that the reasonable adjustment of the signal receiving mode of the passive radar network is realized, and the positioning requirements of different types of objects are fully met.
Fig. 5 is a third schematic flow chart of the positioning method provided by the present invention, as shown in fig. 5, the positioning method includes:
s310, when a passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflected echo signal as well as a non-cooperative radar pulse signal and a corresponding second reflected echo signal and obtains first position information and first attitude information of a target object based on the broadcast/television direct wave signal, the first reflected echo signal, the non-cooperative radar pulse signal and the second reflected echo signal;
and S320, the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
It should be noted that the passive coherent positioning mode refers to that there is no pulse signal emission source in the radar networking system, that is, there is no active radar, and in this mode, the system only has a signal receiving function, but at the same time, a positioning process for a target object may be implemented by using a radiation source outside the system, for example, a pulse signal or a broadcast/television signal emitted by an active radar outside the system may be used. In the embodiment of the invention, the working process of the radar networking system is as follows: the passive radar network receives a broadcast/television direct wave signal, a first reflection echo signal, a non-cooperative radar pulse signal and a second reflection echo signal; the broadcasting/television direct wave signal is reflected to generate a first reflection echo signal after contacting a target object, a non-cooperative radar pulse signal generates a second reflection echo signal after contacting the target object, and the non-cooperative radar refers to an active radar outside a radar networking system.
And the network center performs data fusion on the first position information and the first attitude information of the target object output by the plurality of passive radars in the passive radar network to obtain second position information and second attitude information of the target object.
Fig. 11 is a third application schematic diagram of the multi-station dual-mode PCL/active radar networking system provided in the present invention, where the third application schematic diagram of the radar networking system corresponds to a flowchart of the positioning method provided in the embodiment of the present invention.
The positioning method provided by the invention adjusts the working mode of the passive radar network into a passive coherent positioning mode, and under the working mode, the passive radar network simultaneously utilizes two external radiation sources outside a radar networking system, specifically a broadcast/television signal transmitting station and a non-cooperative active radar, and carries out receiving and fusion processing on a broadcast/television direct wave signal and a non-cooperative radar pulse signal as well as a first reflected echo signal and a second reflected echo signal corresponding to the broadcast/television direct wave signal and the non-cooperative radar pulse signal, and finally obtains first position information and first posture information of a target object.
According to the positioning method provided by the present invention, in the present invention, the obtaining first position information and first attitude information of the target object based on the broadcast/television direct wave signal, the first reflected echo signal, the non-cooperative radar pulse signal, and the second reflected echo signal specifically includes:
the passive radar network carries out signal reconstruction processing on the broadcast/television direct wave signal and the non-cooperative radar pulse signal to obtain a direct wave reference signal;
modifying the first reflection echo signal and the second reflection echo signal by using the direct wave reference signal to obtain a reflection echo reference signal;
and obtaining first position information and first attitude information of the target object based on the direct wave reference signal and the reflected echo reference signal.
Fig. 8 is a flowchart of a dual-mode PCL integrated processing algorithm provided by the present invention, as shown in fig. 8, in a direct wave reference signal branch, a signal acquisition unit first converts an intermediate frequency analog signal into an intermediate frequency digital signal through intermediate frequency a/D sampling, then performs Digital Down Conversion (DDC) to convert the intermediate frequency digital signal into a baseband digital signal, and then performs multi-radiation source signal reconstruction processing on the obtained baseband digital signal by using a "blind equalization algorithm" to recover the direct wave reference signal, where the multi-radiation source signal may be a broadcast/television continuous wave signal, a non-cooperative radar pulse signal, or a broadcast/television continuous wave signal and a non-cooperative radar pulse signal.
In a target echo detection signal branch, a signal acquisition unit firstly converts an intermediate frequency analog signal into an intermediate frequency digital signal through intermediate frequency A/D sampling, then converts a Digital Down Conversion (DDC) into a baseband digital signal, then performs adaptive cancellation on the target echo signal interfered by a direct wave and a balanced direct wave reference signal by using an adaptive interference cancellation algorithm on the obtained baseband digital signal, wherein the direct wave refers to a broadcast/television direct wave signal and/or a non-cooperative radar pulse signal, and then performs synchronous processing on the target echo signal subjected to the adaptive cancellation processing through the direct wave reference signal, wherein the synchronous processing aims to ensure that the broadcast/television direct wave signal and the non-cooperative radar pulse signal keep the same frequency with a first reflection echo signal and a second reflection echo signal which respectively correspond to each other, the accurate corresponding relation between the direct wave signal and the reflected echo signal on time and space is ensured.
A dual-mode PCL processing module exists in a signal acquisition and processing system of a passive radar, the module is mainly used for processing a broadcast/television direct wave signal, a first reflection echo signal, a non-cooperative radar pulse signal and a second reflection echo signal, and the specific processing process comprises the following steps:
processing the broadcast/television continuous wave signal in a correlation processing mode, and processing the broadcast/television continuous wave signal and the first reflection echo signal by adopting a cross-correlation-FFT algorithm to obtain the distance between a target object and a broadcast/television signal transmitting place and a passive radar network and the Doppler frequency shift parameter of the target object respectively; and processing the non-cooperative radar pulse signal in a matched filtering processing mode, and processing the non-cooperative radar pulse signal and the second reflected echo signal by adopting a pulse compression-FFT algorithm to obtain the distance between the target object and the non-cooperative radar and the passive radar network and the Doppler frequency shift parameter of the target object.
The positioning method provided by the invention ensures the accurate corresponding relation of the direct wave signal and the reflected echo signal on time and space by synchronously processing the direct wave signal and the reflected echo signal; and the fusion process of the dual-mode PCL processing module is utilized to realize the positioning process of a target object by simultaneously utilizing a broadcast/television direct wave signal and a non-cooperative radar pulse signal, and based on the positioning process, the complementation on a continuous wave and pulse signal detection and tracking system is realized, so that the positioning process of the target object has the advantages of high continuous wave signal data rate, easiness in realizing stable tracking, large pulse signal energy, strong echo signal and easiness in finding a weak target.
Fig. 6 is a fourth schematic flow chart of the positioning method provided by the present invention, as shown in fig. 6, the positioning method includes:
s410, when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflection echo signal and obtains first position information and first attitude information of the target object based on the broadcast/television direct wave signal and the corresponding first reflection echo signal;
and S420, the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
It should be noted that, in the embodiment of the present invention, only broadcast/television direct wave signals may be utilized in the positioning process of the target object, at this time, the radar networking system only receives the broadcast/television direct wave signals and the first reflected echo signals corresponding to the broadcast/television direct wave signals, and a plurality of passive radars in the passive radar network output first position information and first attitude information of the target object based on the broadcast/television direct wave signals and the first reflected echo signals, respectively; and the network center performs data fusion processing on the multiple pieces of first position information and first attitude information to finally obtain second position information and second attitude information of the target object.
The positioning method provided by the invention realizes the positioning process of the target object by utilizing the broadcast/television direct wave signal and the first reflection echo signal corresponding to the broadcast/television direct wave signal, realizes the accurate positioning of the target object by utilizing the broadcast/television continuous wave signal based on the positioning process, and has the advantages of high data rate and easy realization of stable tracking.
Fig. 7 is a fifth schematic flow chart of the positioning method provided by the present invention, as shown in fig. 7, the positioning method includes:
s510, when a passive radar network is in a passive coherent positioning mode, the passive radar network receives a non-cooperative radar pulse signal and a corresponding second reflected echo signal and obtains first position information and first attitude information of a target object based on the non-cooperative radar pulse signal and the corresponding second reflected echo signal;
s520, the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
It should be noted that, in the embodiment of the present invention, only the pulse signal of the non-cooperative radar may be utilized in the positioning process of the target object, at this time, the radar networking system only receives the pulse signal of the non-cooperative radar and the second reflected echo signal corresponding thereto, and the plurality of passive radars in the passive radar network output the first position information and the first posture information of the target object based on the pulse signal of the non-cooperative radar and the second reflected echo signal, respectively; and the network center performs data fusion processing on the multiple pieces of first position information and first attitude information to finally obtain second position information and second attitude information of the target object.
According to the positioning method provided by the invention, the target object is positioned by utilizing the pulse signal of the non-cooperative radar and the second reflected echo signal corresponding to the pulse signal of the non-cooperative radar, so that the target object is accurately positioned by utilizing the pulse signal of the non-cooperative radar, and the positioning method has the advantages of large pulse signal energy, strong echo signal and easiness in finding a weak target.
Fig. 12 is a second schematic structural diagram of a multi-station dual-mode PCL/active radar networking system provided in the present invention, and as shown in fig. 12, the radar networking system includes: in the embodiment of the invention, the passive radars are provided with fixed flood beam antennas and ESM/PCL receivers, wherein each passive radar utilizes the flood beam antennas to receive beams at a certain angle and is paired with the master radar, and a plurality of passive radars can cover a target area on the basis of the fact that the flood beam antennas and the master radar work in pairs; the ESM/PCL receiver has two signal receiving capacities actually, when the passive radar is in an electronic reconnaissance positioning mode, the receiver can be used for receiving a radiation signal of a target object carrying a radiation source, and when the passive radar is in a passive coherent positioning mode, the receiver can be used for receiving a direct wave signal of broadcasting/television, a non-cooperative radar pulse signal and a first reflection echo signal and a second reflection echo signal which correspond to the direct wave signal and the non-cooperative radar pulse signal. It should be noted that the master station radar in the embodiment of the present invention is equivalent to the active radar.
According to the multi-station dual-mode PCL/active radar networking system, the multi-mode passive radar network is constructed, so that the passive radar network receives various types of signals, and different positioning modes can be selected to realize a target object positioning process in combination with actual application scenes; based on the method, the positioning modes of the target object are enriched, and the target object is accurately positioned.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A multi-station dual-mode PCL/active radar networking system, comprising:
a passive radar mesh comprising a plurality of passive radars for receiving a target signal and deriving a plurality of first position information and first attitude information of a target object corresponding to each passive radar based on the target signal, the target signal comprising at least one of: the method comprises the following steps of (1) radiating signals of a target object, direct wave signals of a radiation source and reflected echo signals of the target object;
the network center is used for obtaining second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the plurality of target objects;
when the passive radar net is in an electronic reconnaissance positioning mode, the passive radar net is used for receiving a radiation signal of the target object;
and when the passive radar net is in a passive coherent positioning mode, the passive radar net is used for receiving the direct wave signal of the radiation source and the reflected echo signal of the target object.
2. The multi-station dual-mode PCL/active radar networking system of claim 1, further comprising: an active radar to send a pulse signal to a target area.
3. The multi-station dual-mode PCL/active radar networking system according to claim 1 or 2, wherein the passive radar comprises:
the antenna system is used for receiving the radiation signal and/or the reflected echo signal of the target object;
the receiving system is used for carrying out frequency conversion, amplification and filtering processing on the received radiation signals and/or the reflected echo signals of the target object to obtain analog signals;
the signal acquisition and processing system is used for obtaining first position information and first attitude information of the target object based on the analog signal;
and the power supply system is used for supplying power to the passive radar.
4. A positioning method using the multi-station dual-mode PCL/active radar networking system according to claim 2, comprising:
when the passive radar network is in a cooperative bistatic receiving mode, the active radar sends a pulse signal to a target area;
the active radar and the passive radar network receive a reflected echo signal of a target object and obtain first position information and first attitude information of the target object based on the pulse signal and the reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
5. A positioning method using the multi-station dual-mode PCL/active radar networking system according to claim 1, comprising:
when the passive radar network is in an electronic reconnaissance positioning mode, the passive radar network receives a radiation signal of a target object and obtains first position information and first attitude information of the target object based on the radiation signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
6. A positioning method using the multi-station dual-mode PCL/active radar networking system according to claim 1, comprising:
when a passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflected echo signal as well as a non-cooperative radar pulse signal and a corresponding second reflected echo signal, and first position information and first attitude information of a target object are obtained based on the broadcast/television direct wave signal, the first reflected echo signal, the non-cooperative radar pulse signal and the second reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
7. The method according to claim 6, wherein the obtaining the first position information and the first attitude information of the target object based on the broadcast/television direct wave signal, the first reflected echo signal, the uncooperative radar pulse signal, and the second reflected echo signal specifically includes:
the passive radar network carries out signal reconstruction processing on the broadcast/television direct wave signal and the non-cooperative radar pulse signal to obtain a direct wave reference signal;
modifying the first reflection echo signal and the second reflection echo signal by using the direct wave reference signal to obtain a reflection echo reference signal;
and obtaining first position information and first attitude information of the target object based on the direct wave reference signal and the reflected echo reference signal.
8. A positioning method using the multi-station dual-mode PCL/active radar networking system according to claim 1, comprising:
when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a broadcast/television direct wave signal and a corresponding first reflection echo signal and obtains first position information and first attitude information of the target object based on the broadcast/television direct wave signal and the corresponding first reflection echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
9. A positioning method using the multi-station dual-mode PCL/active radar networking system according to claim 1, comprising:
when the passive radar network is in a passive coherent positioning mode, the passive radar network receives a non-cooperative radar pulse signal and a corresponding second reflected echo signal and obtains first position information and first attitude information of the target object based on the non-cooperative radar pulse signal and the corresponding second reflected echo signal;
and the network center obtains second position information and second attitude information of the target object through a data fusion process based on the first position information and the first attitude information of the target object.
CN202111144500.9A 2021-09-28 2021-09-28 Multi-station dual-mode PCL/active radar networking system and positioning method Pending CN113933830A (en)

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