A phased array radar jammer system with multi-beam reception and narrow beam transmission

Abstract

The present invention discloses a phased array radar jammer system with multi-beam reception and narrow beam transmission in the field of radar countermeasure technology, including: a jammer host, which is used to parse the azimuth and elevation information of the jammed radar according to the received signal, and modulate the jamming signal output accordingly; a radio frequency distribution network, which is used to transmit signals between the jammer host and the transceiver switch component; a transceiver switch component, which is used to process the received signal, process and transmit the jamming signal, and realize multi-beam reception or narrow beam transmission; a wave control unit, which controls the transmission and reception state of each transceiver channel, and realizes the adjustment of the phase and power of the jamming signal; an antenna array, which is used to receive and transmit radar signals, and is also used to transmit jamming signals. This phased array radar jammer system can autonomously detect the azimuth of the radar signal, and adjust the transmission azimuth of the jamming signal accordingly, effectively improving the utilization efficiency of the phased array jammer, and taking into account the high-power radiation and signal azimuth reconnaissance capabilities.

Description

Technical Field

[0001] The invention relates to the technical field of radar countermeasures, and in particular to a phased array radar jammer system with multi-beam reception and narrow-beam transmission. Background Art

[0002] Radar jammers, also known as radar jammers, are electronic countermeasures used to transmit or forward electromagnetic interference waves to destroy and disrupt the work of enemy radars. Aircraft, ships, tanks, etc. are often threatened by enemy radar reconnaissance during combat operations. Using jammers to implement electronic interference on enemy radars is a common and very effective means of defense.

[0003] Existing common radar jammers usually use a solid-state power amplifier + antenna to achieve high-power transmission, but the effective radiation power of this type of radar jammer is low, and most of the jamming power is radiated into the space where interference is not required, resulting in a waste of signal capacity.

[0004] In order to solve the above problems, radar jammers using phased arrays came into being. Although the existing phased array radar jammers ensure high transmission power and improve effective radiation power, they do not have the ability to detect signal directions and often require other equipment to assist and provide guidance on the jamming direction in order to work properly. Summary of the invention

[0005] The present application provides a phased array radar jammer system with multi-beam reception and narrow beam transmission, taking into account both high-power radiation and signal azimuth reconnaissance capabilities to achieve better jamming effects.

[0006] The embodiment of the present application provides a phased array radar jammer system with multi-beam reception and narrow beam transmission, including a jammer host, a radio frequency distribution network, a transceiver switch component, a beam control unit, and an antenna array;

[0007] The jammer host is used to receive the RF receiving signal and measure its amplitude and frequency, analyze the azimuth and elevation information of the jammed radar, and send the azimuth and elevation information to the beam control unit to control the direction of the narrow jamming beam; at the same time, it is also used to modulate the stored radar signal according to the jamming instruction to form a RF jamming signal and output it to the RF distribution network;

[0008] A radio frequency distribution network, used to send the radio frequency receiving signal transmitted by the transceiver switch component to the interference host, and also used to distribute the radio frequency interference signal emitted by the interference host to the transceiver switch component;

[0009] The transceiver switch component includes a plurality of transceiver channels, each of which has receiving and transmitting functions, and can receive RF receiving signals and transmit RF interference signals in a time-sharing manner. The transceiver switch component is used to process the received RF receiving signals and send them to the RF distribution network, and to process the RF interference signals transmitted by the RF distribution network, and is controlled by the beam control unit to realize multi-beam reception or narrow beam transmission;

[0010] The beam control unit is controlled by the interference host to control the transmission and reception status of each transceiver channel in the transceiver switch group, and controls the transceiver switch components according to the set beam direction and power value to adjust the phase and power of the RF interference signal;

[0011] The antenna array is used to receive radio frequency reception signals and transmit them to the transceiver switch component, and is also used to transmit radio frequency interference signals transmitted by the transceiver switch component.

[0012] The beneficial effect of the above embodiment is that the phased array radar jammer system can autonomously detect the radar signal azimuth and adjust the jamming signal transmission azimuth accordingly, effectively improving the utilization efficiency of the phased array jammer, thereby taking into account both high-power radiation and signal azimuth reconnaissance capabilities. Compared with the beam scanning method, the phased array radar jammer system does not need to conduct reconnaissance on all directions where interference may exist one by one, but uses multiple wider beams for reconnaissance, which saves time and can obtain the arrival direction of the pulse faster in terms of information, so as to achieve a better interference effect.

[0013] Based on the above embodiments, the present application can be further improved as follows:

[0014] In one of the embodiments of the present application, the interference host has four receiving channels, which can synchronously receive radio frequency receiving signals and measure their amplitude and frequency.

[0015] In one embodiment of the present application, the transceiver switch component includes 64 transceiver channels, each of which includes a digitally controlled phase shifter, a digitally controlled attenuator, a transceiver switch, a driver amplifier, a power amplifier, a limiter, and a low-noise amplifier, which are used to limit, amplify, power modulate and phase shift the received signal, and to phase shift, power modulate and amplify the transmitted signal, and are controlled by a beam control unit to achieve multi-beam reception or narrow beam transmission.

[0016] In one embodiment of the present application, the RF distribution network includes a 1-to-4 power splitter, four groups of circulators and four groups of 1-to-16 power splitters / combiners, which are used to distribute the RF interference signals emitted by the interference host to the 64 transceiver channels of the transceiver switch component, and to synthesize the RF receive signals received by the 64 channels of the transceiver switch component into 4 receive channels output to the interference host.

[0017] In one of the embodiments of the present application, the wave control unit is a control circuit with multiple IO interfaces, which is composed of an FPGA, a storage chip and an IO level conversion interface, and is used to control the transmission and reception status of 64 transceiver channels.

[0018] In one of the embodiments of the present application, the antenna array is composed of 64 antennas in an 8×8 layout, which are used to receive and transmit radio frequency signals.

[0019] In one embodiment of the present application, the interfering host includes:

[0020] A microwave frequency conversion unit, including a microwave down-conversion circuit, a microwave local oscillator circuit and a microwave up-conversion circuit, for down-converting the received radio frequency signal into an intermediate frequency signal for processing, and up-converting the processed intermediate frequency signal into a radio frequency interference signal;

[0021] The signal processing unit includes an AD circuit, an FPGA signal processing circuit and a DA circuit, which is used to measure the frequency, amplitude, pulse width and pulse arrival time of the down-converted intermediate frequency signal and generate a radar jamming intermediate frequency signal;

[0022] The data processing unit, composed of FPGA, is used to receive data from the signal processing unit, obtain the direction information of the radar signal through the algorithm, and generate the phased array antenna beam pointing data to send to the beam control unit.

[0023] In one of the embodiments of the present application, in the receiving state, the transceiver switch component amplifies the received radar RF signal through a low noise amplifier, and performs phase shifting and power modulation through a digitally controlled phase shifter and a digitally controlled attenuator before outputting it to a RF distribution network; in the transmitting state, the interference signal is amplified through a driving amplifier and a power amplifier, and performs phase shifting and power modulation through a digitally controlled phase shifter and a digitally controlled attenuator before outputting it to an antenna array.

[0024] In one of the embodiments of the present application, the RF distribution network distributes the radar RF interference signal of the interference host to four groups of circulators through a 1-to-4 power splitter, and then distributes it to 64 transceiver channels through four groups of 1-to-16 power splitters / combiners; at the same time, the radar RF signals received by the 64 channels are combined into 4 channels through four groups of 1-to-16 power splitters / combiners, output to four groups of circulators, and finally sent to the receiving channel of the interference host.

[0025] In one of the embodiments of the present application, the wave control unit controls the CNC phase shifter and CNC attenuator in the transceiver switch component by table lookup, calculates the theoretical phase difference between adjacent channels according to the set beam pointing angle, searches for the phase shift control codeword corresponding to the closest theoretical phase value from the pre-recorded phase values, and sends it to the transceiver switch component to achieve beam pointing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a block diagram of the composition of a phased array radar jammer system with multi-beam reception and narrow beam transmission in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the device module connection of a phased array radar jammer system with multi-beam reception and narrow beam transmission in an embodiment of the present application;

[0029] Figure 3 This is a schematic diagram of the division of the antenna array in an embodiment of the present application;

[0030] Figure 4 This is a block diagram of the composition of the interference host in the embodiment of the present application;

[0031] Figure 5 This is a schematic diagram of the module connection of the host interference in the embodiment of the present application;

[0032] Figure 6 : is a circuit block diagram of a microwave down-conversion circuit in an embodiment of the present application;

[0033] Figure 7 : is a circuit block diagram of a microwave up-conversion circuit in an embodiment of the present application;

[0034] Figure 8 is a circuit block diagram of a signal processing unit in an embodiment of the present application;

[0035] Fig. 9 This is a schematic diagram of a structure for realizing digital channelization of real signals based on a polyphase filtering structure in an embodiment of the present application;

[0036] Fig.10 This is a digital channelization flow chart in an embodiment of the present application;

[0037] Fig.11 This is a flowchart of the CORDIC iterative algorithm implementation in the embodiment of the present application;

[0038] Fig.12 This is a flow chart of instantaneous frequency measurement in an embodiment of the present application;

[0039] Fig.13 A schematic diagram of the beam center angle and target azimuth in an embodiment of the present application;

[0040] Fig.14This is a structural block diagram of a radio frequency distribution network in an embodiment of the present application;

[0041] Fig.15 This is a structural block diagram of the transceiver channel in an embodiment of the present application;

[0042] Fig.16 Schematic diagram of the structure of the antenna array in the embodiment of the present application. DETAILED DESCRIPTION

[0043] The present invention is further explained below in conjunction with specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] Example:

[0046] like Figure 1-2 As shown, a phased array radar jammer system with multi-beam reception and narrow beam transmission includes a jammer host, a radio frequency distribution network, a transceiver switch component, a beam control unit and an antenna array electrically connected to each other;

[0047] The jammer host includes a data processing unit, a microwave frequency conversion unit, and a signal processing unit, which are used to receive the radio frequency receiving signal and measure its amplitude and frequency, analyze the azimuth and elevation information of the interfered radar, and send the azimuth and elevation information to the beam control unit to control the direction of the narrow jamming beam; at the same time, it is also used to modulate the stored radar signal according to the jamming instruction to form a radio frequency jamming signal and output it to the radio frequency distribution network;

[0048] Specifically, the interference host mainly realizes the functions of receiving, measuring, storing, modulating and forwarding interference signals. It can receive and measure the radar signals received by the front-end RF components to obtain the frequency information, amplitude information, pulse width information and pulse arrival time of the radar signals; and the interference host has 4 receiving channels, which can synchronously receive RF signals and measure the amplitude and frequency of RF signals. The interference host uses the data of the 4 receiving channels to parse the azimuth and pitch information of the interfered radar, and sends the information to the beam control unit for the pitch and azimuth pointing data of the narrow interference beam. The data analysis of multiple receiving channels by the interference host is the core algorithm of the device; at the same time, the interference host selects one channel for digital forwarding based on the measured amplitude information; and modulates the stored radar signal according to the interference instruction to form a radar interference signal output to the RF distribution network.

[0049] The RF distribution network is composed of a 1-to-4 power splitter, four groups of circulators, and four groups of 1-to-16 power splitters / combiners, which are used to send the RF receiving signal transmitted by the transceiver switch component to the interference host, and also to distribute the RF interference signal emitted by the interference host to the transceiver switch component;

[0050] Specifically, the RF distribution network is a passive RF signal flow distribution circuit. Due to its passive characteristics, it has high reliability, can work continuously for a long time, and will not be interfered with by the outside world. The RF distribution network realizes two functions, namely, the forwarding distribution of the received signal and the forwarding distribution of the transmitted signal. It can distribute the RF interference signal emitted by the interference host to the 64 transceiver channels of the transceiver switch component, and can also receive the radar signals input from the 64 channels of the transceiver switch component and synthesize them into 4 channels, and output them to the 4 receiving channels of the interference host.

[0051] The transceiver switch assembly includes 64 transceiver channels. Each transceiver channel includes a digitally controlled phase shifter, a digitally controlled attenuator, a transceiver switch, a driver amplifier, a power amplifier, a limiter, and a low noise amplifier. Each transceiver channel has receiving and transmitting functions, and can receive RF receiving signals and transmit RF interference signals in time-sharing. The transceiver switch assembly is used to process the received RF receiving signals and send them to the RF distribution network, and to process the RF interference signals transmitted by the RF distribution network, and is controlled by the beam control unit to realize multi-beam reception or narrow beam transmission;

[0052] Specifically, the transceiver switch component is a power amplification component with a receiving function. The transceiver switch component is composed of 64 transceiver channels. Different from general transceiver channels, the excitation input inside the transceiver switch component and the output of the external receiving signal share a radio frequency interface, and the transmission of high-power signals and the input of the external receiving signal share a radio frequency interface; the component can limit, amplify, power modulate and phase shift the received signal, and phase shift, power modulate and amplify the transmitted signal. The receiving channel and the transmitting channel of the transceiver switch component work in time-sharing and are controlled by the wave control unit.

[0053] The beam control unit is controlled by the interference host to control the transmission and reception status of each transceiver channel in the transceiver switch component, and controls the transceiver switch component according to the set beam direction and power value to adjust the phase and power of the RF interference signal;

[0054] Specifically, the beam control unit is a control circuit with multiple IO interfaces, which is mainly composed of FPGA, storage chip and IO level conversion interface; the beam control unit mainly has three functions: 1) it can control the transmission and reception status of 64 transceiver channels through IO; 2) it can control the phase of the phase shifter of the transceiver channel according to the set beam pointing to achieve the adjustment of the RF signal phase; 3) it can control the digitally controlled attenuator in the transceiver channel according to the set power value to achieve power adjustment.

[0055] The antenna array is used to receive radio frequency reception signals and transmit them to the transceiver switch component, and is also used to transmit radio frequency interference signals transmitted by the transceiver switch component.

[0056] Specifically, the antenna array is an array plane composed of multiple antennas, using an 8×8 layout, and a total of 64 antennas constitute the antenna array.

[0057] For the convenience of description, in this embodiment, 64 antenna arrays are arranged in Figure 3 As shown in the figure, each antenna is named "antenna NM", N represents the row number of the antenna, M represents the column number of the antenna, the first antenna is called antenna 1-1, the last antenna is called antenna 8-8, and the corresponding transceiver switch of each antenna is called "NM transceiver channel"; Figure 3 As shown, the 64 antennas are divided into 4 sub-arrays, namely the 1st to 4th sub-arrays, and the transceiver switch channel corresponding to each sub-array is called the corresponding Nth sub-array transceiver channel.

[0058] In this embodiment, the interfering host is Figure 4 As shown, it is mainly composed of three parts: a microwave frequency conversion unit, a signal processing unit and a data processing unit. The microwave frequency conversion unit is composed of three parts: a microwave down-conversion circuit, a microwave local oscillator circuit and a microwave up-conversion circuit; the signal processing unit is composed of three parts: an AD circuit, an FPGA signal processing circuit and a DA circuit; and the data processing unit is composed of one FPGA.

[0059] When interfering with the host's operation, the signal flow is as follows Figure 5As shown, the microwave down-conversion circuit converts the RF signal synthesized by the 4-way sub-array into 4-way 1.3-2.3GHz intermediate frequency signals through the mixing circuit. The intermediate frequency signal is converted by the 4-way AD circuit to intermediate frequency output and sent to the FPGA signal processing unit. The frequency, amplitude, pulse width and pulse arrival time are measured in the FPGA signal processing unit, and converted into 4-way PDW data and sent to the data processing unit. The data processing unit first matches the signal with the pre-bound data and selects the relevant PDW data. The data processing unit obtains the arrival direction of the radar signal through the algorithm, and generates the phased array antenna beam pointing data and sends it to the beam control unit through the IO parallel port. The control beam control unit configures the corresponding beam pointing to the transceiver switch component before opening the transmission channel to achieve radar interference with the set direction.

[0060] The microwave down-conversion in the jammer is done by Figure 6 In the scheme shown, the microwave down-conversion circuit has a total of 4 independent down-conversion channels, each circuit receives the RF signal of a sub-array, and the RF signal of the corresponding sub-array enters the microwave down-conversion and is filtered, limited and digitally controlled attenuated to adjust the signal to a suitable power range, and is sent to the mixer of the subsequent stage to mix with the local oscillator signal 1. Different local oscillator frequencies can be selected for mixing according to different RF signals, and the RF signal is mixed into a 1.3-2.3GHz intermediate frequency signal. The mixed signal is then amplified and filtered to send the signal to the signal processing unit of the subsequent stage.

[0061] The microwave up-conversion circuit in the jammer uses Figure 7 In the scheme shown, the circuit receives the intermediate frequency interference signal generated by the signal processing unit, which is mixed with the local oscillator signal 1 to obtain the radio frequency interference signal and some mirror signals. The multi-stage filter of the subsequent stage filters the signal multiple times to obtain the corresponding pure radio frequency interference signal, and finally adjusts it to the required power through the data attenuator and sends it to the radio frequency distribution network of the subsequent stage.

[0062] The signal processing unit in the jammer host uses Figure 8 In the scheme shown in FIG. 1 , two FPGAs are used for signal processing. FPGA A is connected to AD circuit 1 and AD circuit 2, and FPGA B is connected to AD circuit 3 and AD circuit 4. Each FPGA uses the channelized data amplitude measurement. The channelization and amplitude measurement process is shown in FIG. Figures 9 to 11 , the digital channelization operation is divided into four steps. First, multiply the rotation factor Then convolve with the filter coefficients and then multiply by the rotation factor Finally, the FFT butterfly operation is performed. The corresponding values ​​are only 1, i, -1, -i, so the real and imaginary parts of the filtered data can be obtained by adding and subtracting the data after multiplying the filter coefficient according to a certain rule, instead of multiplying In this step, the CORDIC algorithm is used on the complex signal data output by the channelization. After N iterations, the amplitude and phase information of the signal can be obtained.

[0063] Frequency measurement uses the instantaneous frequency measurement module to calculate the instantaneous frequency based on the input phase information using the "phase difference method". The processing flow is as follows: Fig.12 shown.

[0064] The signal processing unit in this embodiment uses the GTX high-speed parallel port to make the two FPGAs use the same processing clock to ensure the synchronization of data measurement of each AD circuit; the measurement results of each AD circuit will output information such as frequency, pulse width, amplitude, and arrival time. The measurement results of FPGA A will be transmitted to FPGA B through GTX, and FPGA B will integrate the data and send it to the data processing unit through the IO parallel port. In this embodiment, the corresponding AD circuit data of each channel will be stored in QDR through the high-speed parallel port. When the data processing is completed, an optimal data indication will be returned. The signal processing unit selects the corresponding signal stored in QDR for modulation based on the indication, thereby forming radar interference intermediate frequency data, which is pushed by FPGA B to the DA circuit and converted into a radar interference intermediate frequency signal and sent to the microwave up-conversion unit.

[0065] The data processing unit in the jammer is an independent FPGA circuit, which runs a set of data processing algorithms. The core of the algorithm is to obtain the direction information of the radar signal by measuring the angle by comparing the amplitude. The principle is as follows:

[0066] In this embodiment, the beam pattern of the 16 antenna synthesis subarray can be approximated by a Gaussian function, so the beam pattern is:

[0067]

[0068] Where: θ is the angle between the incoming wave direction and the beam direction; k is related to the shape of the main beam and is usually a fixed constant.

[0069] According to the definition of half-power beamwidth: You can get: where θ 3dB is the half-power beamwidth of F(θ). Substituting it into formula (1), we get the i-th and i+1-th beam functions respectively:

[0070]

[0071] Where: θi is the azimuth corresponding to the beam center of the i-th beam; θ i+1 is the azimuth corresponding to the beam center of the i+1th beam; is the direction of the target signal; θ 3dB is the 3dB beamwidth of the receive beam.

[0072] Fig.13 Schematic diagram of beam center angle and target azimuth.

[0073] What we actually care about is the angle at which the target deviates from the center of the two beams. Assume that θ i+1 >θi, let:

[0074]

[0075] but:

[0076]

[0077] but:

[0078]

[0079] After simplification, we get:

[0080]

[0081] Then we use R to represent the amplitude ratio and convert it to decibels to get:

[0082]

[0083] In fact, is the azimuth angle at which the signal strength of the i-th beam and the i+1 beam is equal, which is known; the strength of the beam is obtained through measurement, so R is also known. Let The target position is estimated using the following formula:

[0084]

[0085] In this embodiment, the radio frequency distribution network is as follows: Fig.14As shown, the RF distribution network in the invention is composed of 1 1-in-4 power splitter, 4 circulators, and 4 1-in-16 / 16-in-1 bidirectional power splitters. The distribution network can realize two functions: 1) distribute 1 radar interference signal to 64 transceiver channels; 2) distribute the RF signals received by the 64 transceiver channels to the 4 circulators for output; when the RF distribution network is in function 1), the 1-in-4 power splitter receives the radar RF interference signal sent by the interference host, divides it into 4 equal parts through the 1-in-4 power splitter, and sends them to the 4 circulators respectively, and outputs them through the next outlet of the circulator. The output signal is connected to the 1-in-16 / 16-in-1 bidirectional power splitter, and the corresponding subarray is connected to the back of the power splitter. Each subarray has 16 channels, which just correspond to the 16 interfaces of the bidirectional power splitter. When the RF distribution network is in function 2), the 1-to-16 / 16-to-1 bidirectional power splitter receives 64 radar RF signals from the transceiver channel, and combines every 16 RF signals into 1 and outputs it to the corresponding connected circulator, which outputs the signal to the corresponding microwave receiving channel through the next outlet.

[0086] In this embodiment, the transceiver switch assembly is composed of 64 transceiver channels, each of which is as follows: Fig.15 As shown in the figure, the transceiver channel is composed of a digitally controlled phase shifter, a digitally controlled attenuator, a transceiver switch, a driver amplifier, a power amplifier, a limiter, and a low noise amplifier. The transceiver switch component mainly realizes two functions: 1) receiving low-power radar interference signals, phase shifting, amplifying and outputting them to the antenna; 2) receiving radar RF signals captured by the antenna, amplifying and phase shifting them, and outputting them to the RF distribution network. The transceiver switch component is controlled by the wave control unit. According to the phase beam pointing principle of the phased array, the appropriate digital controlled phase shift value and the digital controlled attenuation value are adjusted in the transmitting state and the receiving state respectively, so that the component is in the multi-beam receiving state or the narrow beam transmitting state; when the transceiver switch component is in the multi-beam receiving state, the two transceiver switches are connected to the background noise release branch, and the antenna array is divided into 4 4×4 sub-arrays according to the control of the wave control unit. The receiving beam of each sub-array is set to a specified position, so that it can form 4 wide beams with different directions, so that radar signals from different directions can be combined into radar RF signals of different powers on different sub-arrays; when the transceiver switch component is in the narrow beam transmitting state, the two transceiver switches are connected to the driving amplifier and the power amplifier branch, and according to the control of the wave control unit, the 64-channel phase shifter is regarded as an 8×8 array surface, and the transmitting beam of the entire array surface points to the same position, thereby forming a high-gain narrow beam transmitting radar interference signal.

[0087] In this embodiment, the wave control unit is composed of an independent FPGA with large storage capacity, which can realize the control of the phase shifter and the digital controlled attenuator in the transceiver switch component by looking up the table. The logic of the table lookup is as follows:

[0088] If it is necessary to obtain the maximum beam value in the elevation and azimuth (θ, ψ) directions, the phase differences △β and △α within the array should be:

[0089] △β=2Π / λd2sinθ;

[0090] △α=2Π / λd1cosθsinψ;

[0091] The digital controlled attenuator and digital controlled phase shifter in this embodiment are both 6-bit controlled, so the upper limit of the control codeword is 2^6-1, that is, the control range is 00-63. Assume that the number of channels tested and phase values ​​recorded is i, with a value range of 01-64; the attenuation bit is j, with a value range of 00-63; the phase shift is k, with a value range of 00-63. Initially, the phase value of the first channel is Measurement and recording, first control the attenuation of the first channel to 0, the phase shift to 0, the phase value at this time is recorded as Control the phase shift to add one bit, keep other parameters unchanged, measure and record the phase value at this time, recorded as The phase shift control code words from 00 to 63 are traversed in sequence until Then the attenuation bit is increased by 1, the phase shift codeword of the first channel is reset to zero, and the phase at this time is tested and recorded, which is recorded as In this way, the attenuation control code words from 00 to 63 are traversed until Then test the second channel, still starting from attenuation position 00 and phase shift 00, and record the phase value, recorded as Traverse all channels in this way until After all the raw data tests were completed, a total of 64*64*64=262144 raw data were recorded.

[0092] Furthermore, according to the beam pointing angle, the theoretical phase differences △β and △α between adjacent channels are calculated using the formula, and any channel is used as a reference to calculate the theoretical phase values ​​of the remaining 63 channels. Since the power of all channels needs to be consistent, the attenuation bits are the same and the attenuation bits are not considered. Then, from the original data of each channel, the only original phase value closest to the theoretical phase value can be found by comparison, and the phase shift control codeword corresponding to the original phase value is the control signal of the digital controlled phase shifter sent by the wave control unit to the transceiver switch component.

[0093] If the device is in a multi-beam receiving state, the beam control unit queries four different phase shift control code words according to the different directions of the sub-arrays, and sends them after combining them in the format sequence required by the transceiver switch; if the device is in a narrow-beam transmitting state, the beam control unit regards the array as a whole, queries 64 phase shift code words at a time, and sends them according to the format required by the transceiver switch.

[0094] In this embodiment, the antenna array is as follows Fig.16As shown, it is composed of 8×8 array units, 8 units in the E-plane direction and 8 units in the H-plane direction, and has screw holes for each of the 8 antennas to be inserted and fixed individually.

[0095] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0096] 1. This phased array radar jammer system has added multi-channel AD reception, which can effectively utilize multiple independent receiving channels of the phased array jammer, so that the source of the radar interference signal can be determined through a single signal in a shorter time, so that the direction of the interference can be adjusted before each interference, which can effectively improve the utilization efficiency of the phased array jammer;

[0097] 2. Compared with jammers that use other equipment to guide the jamming direction, this phased array radar jammer system can be realized by adding 3 receiving channels to the original phased array jammer equipment, and some of the hardware of the transceiver channels are shared with the original design, saving hardware resources;

[0098] 3. Compared with the beam scanning method, this phased array radar jammer system does not need to conduct reconnaissance one by one in all directions where interference may exist. Instead, it uses multiple wider beams for reconnaissance, which saves time and can obtain the arrival direction of the pulse more quickly.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A phased array radar jammer system with multi-beam reception and narrow beam transmission, characterized in that: Includes interference host, radio frequency distribution network, transceiver switch components, wave control unit and antenna array; The interference host is used to receive the radio frequency receiving signal and measure its amplitude and frequency, calculate the azimuth of the interfered radar signal in real time based on the amplitude ratio angle measurement method, and send the dynamic beam pointing data to the beam control unit; The radio frequency distribution network includes a 1-to-4 power splitter, four groups of circulators and four groups of 1-to-16 power splitters / combiners, which are used to distribute the radio frequency interference signal emitted by the interference host to the 64 transceiver channels of the transceiver switch component, and to synthesize the radio frequency reception signals received by the 64 transceiver channels of the transceiver switch component into 4 outputs; The transceiver switch assembly includes 64 transceiver channels. Based on the control of the beam control unit, the transceiver switch assembly is divided into four 4×4 sub-arrays in the receiving mode, each sub-array independently forms a wide beam to cover different directions, and is integrated into an 8×8 array in the transmitting mode, and all channels cooperate to form a single narrow beam; The beam control unit matches a unique control code from a pre-stored phase code word library according to the dynamic beam pointing data generated by the interference host, and controls the 64 transceiver channels; The antenna array is composed of 64 antennas arranged in an 8×8 configuration and is used to receive radio frequency signals and transmit narrow beam interference signals.

2. The phased array radar jammer system according to claim 1, characterized in that: The transceiver channel includes a digitally controlled phase shifter, a digitally controlled attenuator, a transceiver switch, a driving amplifier, a power amplifier, a limiter, and a low-noise amplifier, which are used to limit, amplify, power modulate, and phase shift the received signal, and to phase shift, power modulate, and amplify the transmitted signal, and are controlled by the beam control unit to achieve multi-beam reception or narrow beam transmission.

3. The phased array radar jammer system according to claim 2, characterized in that: The wave control unit is a control circuit with multiple IO interfaces, including an FPGA, a storage chip and an IO level conversion interface, which is used to control the transmission and reception states of the 64 transceiver channels.

4. The phased array radar jammer system according to claim 1, characterized in that: The interfering host comprises: A microwave frequency conversion unit, including a microwave down-conversion circuit, a microwave local oscillator circuit and a microwave up-conversion circuit, for down-converting the received radio frequency signal into an intermediate frequency signal for processing, and up-converting the processed intermediate frequency signal into a radio frequency interference signal; The signal processing unit includes an AD circuit, an FPGA signal processing circuit and a DA circuit, which is used to measure the frequency, amplitude, pulse width and pulse arrival time of the down-converted intermediate frequency signal and generate a radar jamming intermediate frequency signal; The data processing unit is composed of FPGA, and is used to receive the data from the signal processing unit, obtain the direction information of the radar signal through an algorithm, and generate the phased array antenna beam pointing data and send it to the beam control unit.

5. The phased array radar jammer system according to claim 3, characterized in that: In the receiving state, the transceiver switch assembly amplifies the received radar radio frequency signal through the low noise amplifier, performs phase shifting and power modulation through the digitally controlled phase shifter and the digitally controlled attenuator, and then outputs it to the radio frequency distribution network; In the transmitting state, the interference signal is amplified by the driving amplifier and the power amplifier, and is phase-shifted and power-modulated by the digitally controlled phase shifter and the digitally controlled attenuator before being output to the antenna array.

6. The phased array radar jammer system according to claim 2, characterized in that: The RF distribution network distributes the RF interference signal of the interference host to the four groups of circulators through the 1-to-4 power splitter, and then distributes it to the 64 transceiver channels through the four groups of 1-to-16 power splitters / combiners; at the same time, the radar RF signals received by the 64 transceiver channels are combined into 4 channels through the four groups of 1-to-16 power splitters / combiners, output to the four groups of circulators, and finally sent to the receiving channel of the interference host.

7. The phased array radar jammer system according to claim 3, characterized in that: The wave control unit controls the digitally controlled phase shifter and digitally controlled attenuator in the transceiver switch component by table lookup, calculates the theoretical phase difference between adjacent channels according to the set beam pointing angle, searches for the phase shift control codeword corresponding to the closest theoretical phase value from the pre-recorded phase values, and sends it to the transceiver switch component to realize beam pointing control.

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