Variable polarization sea surveillance radar system

Abstract

The utility model discloses a variable polarization sea surveillance radar system, and relates to the technical field of electronics. According to the system, a variable polarization system is added on the basis of a sea surveillance radar / solid-state navigation radar, and corresponding antenna types and rotary joints are changed, so that on the basis of the conventional functions of the sea surveillance radar / solid-state navigation radar, the transmitting and receiving polarization modes can be changed at will, and the detection performance and the anti-interference capability of the radar are improved; according to the invention, the task of detecting and monitoring a target can be effectively completed, echo signals under different polarizations can be transmitted to corresponding data acquisition and processing equipment, and necessary data support and research basis are provided for anti-interference and anti-wave-making technology research, signal processing method research, electronic countermeasure technology theoretical research and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a variable polarization sea surveillance radar system. BACKGROUND

[0002] The conventional sea surveillance radar / solid-state navigation radar adopts a single horizontal polarization mode, and realizes anti-jamming by changing the frequency of the transmitted signal, and performs interference suppression in the time domain / frequency domain, such as rain and snow interference and sea clutter interference. The research on sea clutter interference in the time domain and the frequency domain has achieved many results, and has improved the discovery and identification probability of small targets under some sea conditions.

[0003] Although the existing technology has discussed and researched the measures taken in the polarization domain to resist sea clutter interference, the existing technology does not involve research and experiments in the variable polarization domain. Therefore, in specific applications, the existing technology still has the technical problems of poor anti-sea clutter interference ability of the radar signal and poor detection performance of the radar. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a variable polarization sea surveillance radar system, which solves the technical problems of the existing technology that the detection performance of the sea surveillance radar is weak and the anti-interference ability is poor in resisting rain and snow and sea clutter in the time domain / frequency domain. The variable polarization technology realizes the technical effects of strong anti-sea clutter interference ability and strong detection performance of the sea surveillance radar in the specific application of the sea surveillance radar.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A variable polarization sea surveillance radar system, comprising a radar transceiver and a radar processor box, wherein the radar transceiver and the radar processor box are electrically connected; the radar transceiver comprises: a sky feed line subsystem for transmitting / receiving a radar signal, the sky feed line subsystem comprising a dual-polarized slot waveguide antenna, a dual-path waveguide rotary joint and a plurality of three-port circulators, wherein the dual-polarized slot waveguide antenna is electrically connected with the dual-path waveguide rotary joint, and the dual-path waveguide rotary joint and the plurality of three-port circulators are electrically connected; the dual-polarized slot waveguide antenna comprises a horizontal polarization antenna and a vertical polarization antenna; a variable polarization system for the transmitted / received radar signal, and performing variable polarization processing on the radar signal based on the received operation instruction to change the electromagnetic wave of the transmitted / received radar signal, the variable polarization system being electrically connected with the sky feed line subsystem; the radar processor box comprises: a display control terminal, the display control terminal being electrically connected with the variable polarization system, and being used for responding to the operation instruction of a user and transmitting the operation instruction of the user to the variable polarization system.

[0007] Further, the radar transceiver further comprises: a signal processing substation electrically connected with the display control terminal; a transceiving sub-system for transmitting the radar signals transmitted / received by the polarization conversion system, the transceiving sub-system being electrically connected with the polarization conversion system and the signal processing substation respectively; and a solid-state power amplifier unit electrically connected with the polarization conversion system and the transceiving sub-system respectively.

[0008] Further, the radar transceiver further comprises: a signal processing substation electrically connected with the display control terminal; a transceiving sub-system for transmitting the radar signals transmitted / received by the polarization conversion system, the transceiving sub-system being electrically connected with the polarization conversion system and the signal processing substation respectively; and a solid-state power amplifier unit electrically connected with the polarization conversion system and the transceiving sub-system respectively.

[0009] Further, the polarization conversion system comprises a polarization controller, a transmitting polarizer and a receiving polarizer, the input end of the polarization controller is electrically connected with the display control module, the output end of the polarization controller is electrically connected with the transmitting polarizer and the receiving polarizer respectively, the transmitting polarizer and the receiving polarizer are connected to the double-path waveguide rotary joint through a plurality of three-port circulators respectively, the transmitting polarizer is electrically connected with the solid-state power amplifier unit, and the receiving polarizer is electrically connected with the transceiving sub-system, the polarization controller is used for absorbing the load of the radar signals transmitted / received, the transmitting polarizer is used for outputting the radar signals transmitted, and the receiving polarizer is used for obtaining the radar signals received.

[0010] Further, the transmitting polarizer comprises: an input end quadrature modulator for inputting the radar signals transmitted amplified by the solid-state power amplifier unit; a polarization converter for performing polarization control on the radar signals transmitted; a phase shifter for performing phase shift control on the radar signals transmitted after polarization control; and an output end quadrature modulator for outputting the radar signals transmitted after phase shift control to the three-port circulator, wherein the input end quadrature modulator is electrically connected with the polarization converter, the polarization converter is electrically connected with the phase shifter, and the phase shifter is electrically connected with the output end quadrature modulator.

[0011] Further, the receiving polarizer comprises: an input end quadrature modulator for inputting the radar signals received by the three-port circulator; a polarization converter for performing polarization control on the radar signals received; a phase shifter for performing phase shift control on the radar signals received after polarization control; and an output end quadrature modulator for outputting the radar signals received after phase shift control and sending the radar signals to the transceiving sub-system, wherein the input end quadrature modulator is electrically connected with the polarization converter, the polarization converter is electrically connected with the phase shifter, and the phase shifter is electrically connected with the output end quadrature modulator.

[0012] Further, the plurality of three-port circulators comprises: a horizontal component three-port circulator, configured to receive a horizontal signal component of the transmitted radar signal output by the transmitting polarizer and transmit the horizontal signal component to the dual-channel waveguide rotary joint; the horizontal component three-port circulator is further configured to receive a horizontal signal component of the received radar signal output by the dual-channel waveguide rotary joint and transmit the horizontal signal component to the receiving polarizer; a vertical component three-port circulator, configured to receive a vertical signal component of the transmitted radar signal output by the transmitting polarizer and transmit the vertical signal component to the dual-channel waveguide rotary joint; the vertical component three-port circulator is further configured to receive a vertical signal component of the received radar signal output by the dual-channel waveguide rotary joint and transmit the vertical signal component to the receiving polarizer.

[0013] Further, the radar transceiver further comprises a servo subsystem connected with the signal processing subsystem; the servo subsystem is configured to drive the motor based on the antenna rotation control instruction output by the industrial computer to control rotation of the dual-polarized slot waveguide antenna.

[0014] Further, the radar processing box further comprises a power module; the power module is electrically connected to the radar processing box and the radar transceiver.

[0015] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] The embodiments of the present application effectively solve the technical problems that the anti-sea clutter interference ability of radar signals is poor and the detection performance of the radar is poor in the prior art by adding a variable polarization system to the sea monitoring radar / solid-state navigation radar and correspondingly changing the antenna type and the rotary joint, thereby realizing improvement of the detection performance and the anti-interference ability of the radar, effectively completing the task of detecting and monitoring targets, and also transmitting echo signals under different polarizations to corresponding data acquisition and processing equipment, providing necessary data support and research basis for anti-interference, anti-wave making technology, signal processing method research, electronic countermeasure technology theory research, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 The basic structure diagram of the variable polarization sea monitoring radar system provided by the embodiments of the present application is shown in the following figure:

[0019] Figure 2 The internal architecture diagram of the polarization controller provided by the embodiments of the present application is shown in the following figure:

[0020] Figure 3 An internal architecture diagram of a radar transceiver provided for an embodiment of the present application is shown in FIG. 1.

[0021] Figure 4 An internal architecture diagram of a radar processor box provided for an embodiment of the present application is shown in FIG. 2.

[0022] Figure 5 An architecture diagram of a data acquisition processing unit and an industrial computer provided for an embodiment of the present application is shown in FIG. 3.

[0023] Figure 6 A structural schematic diagram of a transmitting polarizer provided for an embodiment of the present application is shown in FIG. 4.

[0024] Figure 7 A structural schematic diagram of a receiving polarizer provided for an embodiment of the present application is shown in FIG. 5.

[0025] The reference signs: 1-magnetic circuit, 2-square waveguide, 3-pole, 4-ferrite strip, 5-magnetizing coil, 6-metalized ferrite round rod, 7-locking magnetic circuit. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0027] The embodiments of the present application provide a polarized change sea monitoring radar system, which as a whole includes a radar transceiver, a radar processor box and an industrial computer.

[0028] Figure 1 A basic structure diagram of the polarized change sea monitoring radar system provided for an embodiment of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the radar transceiver includes a sky feeder system, a polarized change system, a transceiver sub-system, a signal processing sub-system and a solid-state power amplifier unit.

[0029] Specifically, the sky feeder system is configured to transmit and receive radar signals, and includes a dual-polarized slot waveguide antenna, a dual-path waveguide rotary joint and a plurality of three-port circulators.

[0030] The dual-polarized slot waveguide antenna is electrically connected to the dual-path waveguide rotary joint, and the dual-path waveguide rotary joint is electrically connected to the three-port circulators.

[0031] The dual-polarized slot waveguide antenna includes a horizontally polarized antenna and a vertically polarized antenna, which can simultaneously receive / transmit radar signals in both the horizontal and vertical directions.

[0032] Specifically, the multiple three-terminal circulators include a horizontal component three-terminal circulator and a vertical component three-terminal circulator.

[0033] The horizontal component three-terminal circulator, in its function of transmitting radar signals, is used to receive the horizontal signal component of the transmitted radar signal output by the transmitting polarizer and send it to the dual-waveguide rotary joint. In its function of receiving radar signals, the horizontal component three-terminal circulator is used to receive the horizontal signal component of the received radar signal output from the dual-waveguide rotary joint to the horizontal component three-terminal circulator and transmit it to the receiving polarizer.

[0034] Similarly, the vertical component three-terminal circulator, in its function of transmitting radar signals, sends the vertical signal component of the transmitted radar signal output from the transmitting polarizer to the dual-waveguide rotary joint. In its function of receiving radar signals, it receives the vertical signal component of the received radar signal output from the dual-waveguide rotary joint and sends it to the receiving polarizer.

[0035] like Figure 3 As shown, the dual-waveguide rotary joint has a horizontal polarization interface and a vertical polarization interface. The horizontal polarization interface is electrically connected to the horizontal polarization antenna, and the vertical polarization interface is electrically connected to the vertical polarization antenna. The horizontal polarization interface is used to transmit the horizontal signal component of the radar signal, and the vertical polarization interface is used to transmit the vertical signal component of the radar signal.

[0036] like Figure 1 As shown, the variable polarization system is used to perform variable polarization processing on radar signals, including a polarization controller, a transmitting polarizer, and a receiving polarizer.

[0037] The output of the polarization controller is electrically connected to the transmitting polarizer and the receiving polarizer, respectively, to control the transmitting polarizer and the receiving polarizer, and to absorb the load of the transmitted / received radar signal, thereby realizing the polarization processing of the radar signal.

[0038] The transmitting polarizer is used to output the transmitted radar signal and to polarize and phase-shift it.

[0039] A receiving polarizer is used to acquire the received radar signal and polarize and phase-shift it.

[0040] Specifically, the internal structure of the polarization controller is as follows: Figure 2 As shown, in Figure 2 In this system, the polarization controller includes a main control management subsystem, an FPGA subsystem, and a digital-to-analog conversion and power amplification subsystem.

[0041] The main control management subsystem is electrically connected with the industrial computer through an RJ45 Ethernet, and is also electrically connected with the FPGA subsystem. The main control management subsystem specifically embodies one or more single-chip microcomputers electrically connected with each other. The main control management subsystem is used to realize the write operation of the control instruction of the polarization controller, which is issued by the user. Meanwhile, the user can also adjust the corresponding polarization control parameters to complete the adjustment of the entire polarization controller.

[0042] The FPGA subsystem synchronizes the radar signal to the radar processing machine box based on a conversion interface. When receiving / transmitting the radar signal, the FPGA subsystem transmits the radar signal to the digital-to-analog conversion and power amplification subsystem based on the instruction of the main control management subsystem.

[0043] The digital-to-analog conversion and power amplification subsystem is used to realize the digital-to-analog conversion and power amplification operation of the radar signal.

[0044] Specifically, in the embodiment of the present application, the polarization controller internally includes a polarization control path A and a polarization control path B. The polarization control path A is responsible for transmitting the polarization control signal to the transmitting polarizer, and the polarization control path B is responsible for transmitting the polarization control signal to the receiving polarizer.

[0045] The polarization control paths A and B can generate 4-channel VA, VB and ΦA, ΦB polarization control timing signals corresponding to the values of the polarization control parameters (V, Φ) by setting or changing the values of the polarization control parameters (V, Φ), and output after amplification by a 4-channel signal power amplifier to control the transmitting polarizer and the receiving polarizer. The polarization control paths A and B have the function of independently generating the degaussing signal of the variable polarizer.

[0046] Among them, VA represents the polarization control timing signal generated by the polarization control parameter V in the polarization control path A; and VB represents the polarization control timing signal generated by the polarization control parameter V in the polarization control path B.

[0047] ΦA represents the polarization control timing signal generated by the polarization control parameter Φ in the polarization control path A; and ΦB represents the polarization control timing signal generated by the polarization control parameter Φ in the polarization control path B.

[0048] It should be noted that the 4-channel signal power amplifier outputs a digital signal as an analog control signal by performing D / A digital-to-analog conversion. The range of the analog control signal is -12V~12V.

[0049] The conversion rate in the D / A digital-to-analog conversion process is not less than 1MHz, and the data bit number in the D / A digital-to-analog conversion is not less than 10 bits.

[0050] The start time of the 4-channel VA, VB and ΦA, ΦB polarization control timing signals is strictly synchronized with the start time of the radar transmission trigger pulse signal.

[0051] Polarization control paths A and B have manual preset polarization control function (allowing for the selection of 4 polarization states) and manual scan polarization control function, respectively.

[0052] The polarization controller is powered by a power module inside the radar processing chassis. The power module outputs a 15V supply voltage and a 5A supply current to the polarization controller.

[0053] Figure 6 This is a schematic diagram of the emitter polarizer provided in an embodiment of this application, as shown below. Figure 6 As shown, the internal structure of the emitter polarizer provided in this application embodiment includes an input quadrature mode converter, a polarizer, a phase shifter, and an output quadrature mode converter.

[0054] The polarizer is used for amplitude adjustment and phase compensation of the radar signal, that is, for polarization control of the transmitted radar signal. The phase shifter is used to perform phase adjustment of the radar signal, that is, for phase shift control of the polarized transmitted radar signal.

[0055] The transmission process of the transmitted radar signal in the transmitting polarizer includes: the radar signal is input from the input terminal of the quadrature mode converter, undergoes amplitude adjustment and phase compensation through the polarizer, then undergoes phase adjustment through the phase shifter, and is output from the output port 1 and output port 2 of the quadrature mode converter to the horizontal component three-terminal circulator and the vertical component three-terminal circulator.

[0056] It should be noted that the input quadrature mode converter also has an interface that is connected to the polarization controller to absorb the load brought by the transmitted radar signal.

[0057] like Figure 6 The physical structure diagram of the emitter polarizer shown below shows that, in its physical state, the emitter polarizer includes a set of annular magnetic circuits 1. A square waveguide 2 is provided in the middle of the magnetic circuit 1. The square waveguide 2 is connected to the magnetic circuit 1 through magnetic poles 3. Magnetizing coils 5 are wound around the outside of the magnetic poles 3. Ferrite strips 4 are provided around the four sides of the square waveguide 2.

[0058] Figure 7 This is a schematic diagram of the receiving polarizer provided in an embodiment of this application, as shown below. Figure 7As shown in the embodiments of this application, the receiving polarizer and the transmitting polarizer have the same structure. However, the input quadrature mode converter of the receiving polarizer has two input ports, 1 and 2. Input ports 1 and 2 are used to receive the horizontal signal component and the vertical signal component of the received radar signal input from the horizontal component three-terminal circulator and the vertical component three-terminal circulator, respectively. The horizontal signal component and the vertical signal component are combined in the input quadrature mode converter to form the received radar signal input to the receiving polarizer.

[0059] The received radar signal passes through a polarizer and a phase shifter after input, and is output to the transceiver subsystem via an orthogonal mode converter at the output end. Similarly, in the receiver polarizer, the output orthogonal mode converter also has an interface connected to the polarization controller to absorb the load brought by the received radar signal.

[0060] like Figure 7 As shown in the figure below, in its physical state, the receiving polarizer includes a metallized ferrite rod 6 and a locking magnetic circuit 7, with the metallized ferrite rod 6 encased outside the locking magnetic circuit.

[0061] In this embodiment of the application, the radar transceiver further includes:

[0062] The signal processing unit is used to process and analyze the radar signals received by the variable polarization system. The signal processing unit is electrically connected to the display and control terminal.

[0063] The transceiver subsystem is used to transmit radar signals transmitted / received by the polarization system. The transceiver subsystem is electrically connected to both the polarization system and the signal processing subsystem.

[0064] The solid-state power amplifier unit is used to amplify the radar signal to be transmitted and enhance the signal strength of the transmitted radar signal. The solid-state power amplifier unit is electrically connected to the polarization system and the transceiver subsystem.

[0065] In this embodiment of the application, the transceiver subsystem includes a transmitting subsystem and a receiving subsystem.

[0066] The transmitting subsystem is used to convert low-frequency radar signals into high-frequency radar signals, and the receiving subsystem is used to receive high-frequency radar signals from the antenna feeder subsystem and convert them into low-frequency radar signals for processing by the signal processing subsystem.

[0067] The signal processing unit works in conjunction with the transceiver subsystem to process and analyze radar signals. Specifically, the signal processing unit can perform operations such as clutter suppression and target detection on the received radar signals to suppress radar clutter, improve radar signal visibility, and achieve target detection and tracking.

[0068] Meanwhile, the signal processing branch can send the processing and results of the radar signal to the display control terminal to respond to user operations and achieve adjustment of the polarization control parameters of the polarization controller.

[0069] Figure 3 An internal architecture of the radar transceiver provided by the embodiments of the present application is shown in FIG. 1, which includes a plurality of power dividers, signal distributors, servo systems, power supply units, and a plurality of interfaces. These electronic devices are used to cooperate with the main systems such as the antenna feeder system and the variable polarization system to complete the receiving and transmitting of the radar signal. Figure 3

[0070] Specifically, the internal architecture of the radar transceiver is as follows:

[0071] The upper ends of the dual-path waveguide rotary joints are electrically connected to the horizontal polarization interface and the vertical polarization interface, respectively, and are electrically connected to the horizontal polarization antenna and the vertical polarization antenna. The lower ends are electrically connected to the horizontal component three-port circulator and the vertical component three-port circulator.

[0072] The other two ends of the horizontal component three-port circulator are electrically connected to the transmitting polarizer and the receiving polarizer. Similarly, the other two ends of the vertical component three-port circulator are electrically connected to the transmitting polarizer and the receiving polarizer.

[0073] The transmitting polarizer and the receiving polarizer are connected to the polarization controller and are controlled by the polarization controller. Meanwhile, the transmitting polarizer is electrically connected to the output end of the solid-state power amplifier unit, and the solid-state power amplifier unit is used to output the transmitting radar signal to the transmitting polarizer. The receiving polarizer is electrically connected to the transceiver separation system.

[0074] The transceiver separation system is also electrically connected to the solid-state power amplifier unit and sends an excitation signal to the solid-state power amplifier unit. Meanwhile, the transceiver separation system is also electrically connected to two power dividers, which are used to output the intermediate frequency signal and the sampling clock, respectively.

[0075] One output end of the power divider outputting the intermediate frequency signal is connected to the signal processing branch, and the other output end is electrically connected to the data acquisition unit through the intermediate frequency output interface of the radar transceiver. The output frequency of the power divider is 180 MHz.

[0076] One output end of the power divider outputting the sampling clock is electrically connected to the data acquisition unit through the clock output interface of the radar transceiver. The output frequency of the clock output interface of the power divider is 240 MHz. The other output end is connected to the signal processing branch to transmit the sampling clock signal to the signal processing branch.

[0077] ​The transceiver subsystem also has an output interface electrically connected with the signal distributor, which is used to send a trigger pulse and transmit the trigger pulse to the data acquisition unit through the signal distributor and the trigger pulse interface. Meanwhile, the trigger pulse can also be sent to the polarization controller through the signal distributor.

[0078] The signal processing extension also connects with the polarization controller, which is used to receive the RS422 polarization synchronization pulse. Meanwhile, the signal processing extension transmits the polarization information and the azimuth code signal to the data acquisition unit through the azimuth code & polarization information interface.

[0079] The signal processing extension also connects with the servo subsystem, which is used to drive the motor based on the antenna rotation control instruction output by the industrial computer, so as to realize the rotation control of the dual-polarized slot waveguide antenna.

[0080] The signal processing extension is electrically connected with the radar processor box through the network port 1 interface.

[0081] The polarization controller is electrically connected with the radar processor box through the network port 2 interface, which is used to realize the polarization control of the radar processor box on the polarization controller.

[0082] The radar transceiver also includes a power supply unit, which is used to convert the AC output by the radar processor box into the DC required by the radar transceiver.

[0083] The input end of the power supply unit is connected with the AC220 output 1 interface of the radar processor box through the power supply interface, and the AC220 output 1 interface inputs 220V AC.

[0084] One output end of the power supply unit is electrically connected with the polarization controller to realize the power supply of the polarization controller, and the other output end is electrically connected with other electronic devices to realize the DC output.

[0085] Figure 4 The internal architecture of the radar processor box provided by the embodiment of the present application is shown in the figure, and the radar processor box provided by the present application also includes a switch, an AC / DC conversion module and a switch, and the radar processor box also includes a plurality of interfaces, which are used to be electrically connected with the radar transceiver and the industrial computer. Figure 4

[0086] Specifically, the internal architecture of the radar processor box is as follows:

[0087] ​The AC220 input interface of the radar processing chassis is electrically connected to the power module. This AC220 input interface is also connected to a switch, which controls the power status between the radar processing chassis, the radar transceiver, and the data acquisition unit. Specifically, the switch has three output interfaces. AC220 output 1 controls the on / off state of the radar transceiver. AC220 output 2 controls the on / off state of the data acquisition and processing unit. The third interface of the switch is connected to an AC / DC conversion module, which converts AC power to DC power and sends the DC power to the display and control terminal.

[0088] The display and control terminal is connected to the radar transceiver via Ethernet port 1. It is connected to the industrial control computer via Ethernet port 3.

[0089] Meanwhile, the display and control terminal is also connected to other modules such as AIS / GPS, as well as a switch for data exchange. The switch is connected to the radar transceiver through network port 2 and to the industrial control computer through network port 4.

[0090] In this embodiment of the application, a data acquisition and processing unit and an industrial control computer are also included, such as Figure 5 As shown, Figure 5 This is an architecture diagram of the data acquisition and processing unit and the industrial control computer provided in the embodiments of this application.

[0091] Specifically, the data acquisition and processing unit is electrically connected to the radar transceiver via an intermediate frequency output interface, a clock output interface, and a trigger pulse interface. The data acquisition and processing unit is electrically connected to the radar processing chassis via an AC220 output 2 interface and a azimuth code & polarization information interface. The industrial control computer is electrically connected to the radar processing chassis via Ethernet 4 interfaces.

[0092] In this embodiment of the application, the signal transmission process for transmitting and receiving radar signals is as follows:

[0093] Radar signal transmission section: The transmitted radar signal generated by the solid-state power amplifier unit is transmitted to the input port of the transmitting polarizer. Inside the transmitting polarizer, the polarization controller changes the polarization state of the radar signal to be transmitted and absorbs the load to obtain the transmitted radar signal. The horizontal and vertical signal components of the transmitted radar signal are sent from the output port of the transmitting polarizer to the dual-channel waveguide rotary joint through a three-terminal circulator. The horizontal polarization interface of the dual-channel waveguide rotary joint sends the horizontal signal component of the radar transmitted signal to the horizontally polarized antenna. The vertical polarization interface of the dual-channel waveguide rotary joint sends the vertical signal component of the radar signal to the vertically polarized antenna.

[0094] The receiving radar signal part: the dual-polarized slot waveguide antenna receives the radar signal from the outside, transmits the signal components in the horizontal direction and the signal components in the vertical direction of the received radar signal to the input end ports of the receiving polarizer respectively through the dual-path waveguide rotating joint, changes the polarization state through the receiving polarizer, synthesizes the changed signal components in the horizontal direction and the signal components in the vertical direction, transmits the synthesis result to the transceiver subsystem, obtains the intermediate frequency signal after filtering, frequency conversion and amplification of the transceiver subsystem, and transmits the intermediate frequency signal to the signal processing subsystem.

[0095] The embodiment of the application discloses a variable polarization anti-sea monitoring radar system, which has the functions of coast defense, monitoring and navigation of a conventional anti-sea monitoring radar and solid-state navigation radar, can change the polarization modes of transmitted and received radar signals at will, improves the detection performance and anti-interference capability of the radar, more effectively completes the detection and monitoring target task, and can transmit echo signals under different polarizations to corresponding data acquisition and processing equipment, thereby providing necessary data support and research basis for anti-interference, anti-clutter technology, signal processing method research and electronic countermeasure technology theory research.

[0096] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims.

[0097] The above embodiments are only used to illustrate the technical solutions of the application, and are not limited to the application; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the application.

Claims

1. A variable polarization maritime surveillance radar system, characterized in that, It includes a radar transceiver and a radar processing chassis, wherein the radar transceiver and the radar processing chassis are electrically connected; Radar transceivers, including: The antenna feeder subsystem is used to transmit / receive radar signals. The antenna feeder subsystem includes a dual-polarized slotted waveguide antenna, a dual-channel waveguide rotary joint, and multiple three-terminal circulators. The dual-polarized slotted waveguide antenna is electrically connected to the dual-channel waveguide rotary joint, and the dual-channel waveguide rotary joint is electrically connected to the multiple three-terminal circulators. The dual-polarized slotted waveguide antenna includes a horizontally polarized antenna and a vertically polarized antenna. The polarization system is used to process the transmitted / received radar signals and, based on the received operation commands, to change the electromagnetic waves of the transmitted / received radar signals. The polarization system is electrically connected to the antenna feeder subsystem. The radar processing chassis includes: The display and control terminal is electrically connected to the polarization system and is used to respond to user operation commands and transmit user operation commands to the polarization system.

2. The variable polarization maritime surveillance radar system according to claim 1, characterized in that, It also includes a data acquisition and processing unit and an industrial control computer; The data acquisition and processing unit is used to store the transmitted / received radar signals. The data acquisition and processing unit is electrically connected to the radar transceiver and the radar processing unit chassis, respectively. The industrial control computer is electrically connected to the radar processing chassis, radar transceiver, and data acquisition and processing unit. The industrial control computer is used to drive the radar processing chassis, radar transceiver, and data acquisition and processing unit based on user operation commands.

3. The variable polarization maritime surveillance radar system according to claim 1, characterized in that, The radar transceiver also includes: The signal processing unit is electrically connected to the display and control terminal; The transceiver subsystem is used to transmit radar signals transmitted / received by the polarization system. The transceiver subsystem is electrically connected to the polarization system and the signal processing subsystem, respectively. The solid-state power amplifier unit is electrically connected to the variable polarization system and the transceiver subsystem, respectively.

4. The variable polarization maritime surveillance radar system according to claim 3, characterized in that, The variable polarization system includes a polarization controller, a transmitting polarizer, and a receiving polarizer; The input terminal of the polarization controller is electrically connected to the display and control module, and the output terminal of the polarization controller is electrically connected to the transmitting polarizer and the receiving polarizer respectively. The transmitting polarizer and the receiving polarizer are respectively connected to the dual-waveguide rotary joint through multiple three-terminal circulators; The transmitting polarizer is electrically connected to the solid-state power amplifier unit, and the receiving polarizer is electrically connected to the transceiver subsystem. The polarization controller is used to absorb the load of the transmitted / received radar signal; the transmitting polarizer is used to output the transmitted radar signal. The receiving polarizer is used to acquire the received radar signal.

5. The variable polarization maritime surveillance radar system according to claim 4, characterized in that, The emitter polarizer includes: The input quadrature mode converter is used to input the transmitted radar signal after it has been amplified by the solid-state power amplifier unit; A polarizer is used to control the polarization of the transmitted radar signal. A phase shifter is used to perform phase shifting control on the transmitted radar signal after polarization control; The output quadrature mode converter is used to output the transmitted radar signal after phase shift control to the three-terminal circulator; The input quadrature mode converter is electrically connected to the polarizer, the polarizer is electrically connected to the phase shifter, and the phase shifter is electrically connected to the output quadrature mode converter.

6. The variable polarization maritime surveillance radar system according to claim 4, characterized in that, The receiving polarizer includes: The input quadrature mode converter is used to input the radar signal received by the three-terminal circulator; A polarizer is used to control the polarization of received radar signals. A phase shifter is used to perform phase shifting control on the received radar signal after polarization control; The output quadrature mode converter is used to output the received radar signal after phase shift control and send it to the transceiver subsystem; The input quadrature mode converter is electrically connected to the polarizer, the polarizer is electrically connected to the phase shifter, and the phase shifter is electrically connected to the output quadrature mode converter.

7. The variable polarization maritime surveillance radar system according to claim 4, characterized in that, The plurality of three-terminal circulators include: The horizontal component three-terminal circulator is used to receive the horizontal signal component of the transmitted radar signal output by the transmitting polarizer and send it to the dual-path waveguide rotary joint; the horizontal component three-terminal circulator is also used to receive the horizontal signal component of the received radar signal output by the dual-path waveguide rotary joint and send it to the receiving polarizer. The vertical component three-terminal circulator is used to receive the vertical signal component of the transmitted radar signal output by the transmitting polarizer and send it to the dual-path waveguide rotary joint; the vertical component three-terminal circulator is also used to receive the vertical signal component of the received radar signal output by the dual-path waveguide rotary joint and send it to the receiving polarizer.

8. The variable polarization maritime surveillance radar system according to claim 1, characterized in that, The radar transceiver also includes a servo subsystem, which is connected to the signal processing subsystem. The servo subsystem is used to drive the motor based on the antenna rotation control commands output by the industrial control computer, thereby controlling the rotation of the dual-polarized slotted waveguide antenna.

9. The variable polarization maritime surveillance radar system according to claim 1, characterized in that, The radar processing chassis also includes a power module; The power module is electrically connected to the radar processing chassis and the radar transceiver.

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