A system for intercepting and direction finding of discontinuous ultra-wideband pulses

Abstract

The present invention discloses a system for intercepting and direction finding of discontinuous ultra-wideband pulses, which relates to the field of electronic reconnaissance technology. The system includes an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas. The instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow-speed ADC unit and an FPGA unit, and can realize a 5ns fast-response SDLVA video detection + high-speed 1-bit frequency measurement system to intercept discontinuous ultra-wideband pulses and extract relevant parameters. Furthermore, after fusing the pulse description word information with the direction finding result, the function of intercepting and direction finding of discontinuous ultra-wideband pulses can be formed, solving the problems of low intercept success probability of the existing intercepting and direction finding system for discontinuous ultra-wideband pulses and difficult signal warning recognition and azimuth measurement even if intercepted.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic reconnaissance, and particularly relates to a system for intercepting and direction finding of discontinuous ultra-wideband pulses. Background Art

[0002] In electronic reconnaissance equipment, the traditional system for intercepting electromagnetic wave pulse signals has problems in intercepting discontinuous ultra-wideband pulses (i.e., discontinuous UWB pulses, where UWB is the abbreviation of Ultra Wide Band, and the US Federal Communications Commission stipulates that it occupies a bandwidth of more than 500 MHz in the frequency band of 3.1 - 10.6 GHz), including low success probability of interception, and difficult signal warning recognition and azimuth measurement even if intercepted. In addition, for high-power discontinuous ultra-wideband pulse signals, the traditional interception and direction finding system also has problems of weak protection against "front door" (i.e., electromagnetic waves directly coupled to the antenna) and "back door" (i.e., electromagnetic waves coupled to the receiving system through some indirect channels, such as through holes, gaps, and / or cables, etc.), which easily leads to system crash or irreversible damage. Summary of the Invention

[0003] The purpose of the present invention is to provide a new system for intercepting and direction finding of discontinuous ultra-wideband pulses, so as to solve the problems of low success probability of interception and difficult signal warning recognition and azimuth measurement of the existing interception and direction finding system for discontinuous ultra-wideband pulses.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A system for intercepting and direction finding of discontinuous ultra-wideband pulses includes an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas, each single-channel down-conversion unit in the multi-channel down-conversion module corresponds to each element planar spiral antenna in the multi-element planar spiral antenna, and each single-channel acquisition and processing unit in the multi-channel acquisition and processing module corresponds to each single-channel down-conversion unit;

[0006] The antenna array is used to receive radio frequency signals radiated from space;

[0007] The radio frequency routing and distribution module is electrically connected to the antenna array, the instantaneous frequency measurement module, and the multi-channel down-conversion module respectively, and is configured to receive multiple radio frequency signals sent by the antenna array and corresponding to the multi-element planar spiral antennas one by one, send any one of the multiple radio frequency signals to the instantaneous frequency measurement module, and send each of the multiple radio frequency signals to the single-channel down-conversion unit corresponding thereto in the multi-channel down-conversion module;

[0008] The instantaneous frequency measurement module is electrically connected to the multi-channel down-conversion module, and is configured to perform signal instantaneous frequency measurement on the sent radio frequency signal, and use the signal instantaneous frequency measurement result to guide each single-channel down-conversion unit in the multi-channel down-conversion module to perform frequency down-conversion processing. Among them, the instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow ADC unit, and an FPGA unit;

[0009] The microwave channel unit is electrically connected to the high-speed ADC unit and the slow ADC unit respectively, and is configured to perform amplitude limiting, amplification, detection, and attenuation on the sent radio frequency signal in sequence, send the finally obtained radio frequency signal to the high-speed ADC unit, and send the detection signal obtained through the detection process to the slow ADC unit. Among them, the detection process adopts the SDLVA video detection method based on a 5ns fast rise / fall time;

[0010] The high-speed ADC unit is electrically connected to the FPGA unit, and is configured to perform high-speed 1-bit sampling processing on the sent radio frequency signal to obtain a first digital signal, and send the first digital signal to the FPGA unit;

[0011] The slow ADC unit is electrically connected to the FPGA unit, and is configured to perform amplitude sampling processing on the sent detection signal to obtain a second digital signal, and send the second digital signal to the FPGA unit;

[0012] The FPGA unit is configured to process and fuse the first digital signal and the second digital signal to obtain pulse description word information used as the signal instantaneous frequency measurement result. Among them, the pulse description word information includes frequency, pulse width, amplitude, and / or arrival time;

[0013] The multi-channel down-conversion module is electrically connected to the multi-channel acquisition and processing module, and is configured to provide a reference clock for the multi-channel acquisition and processing module, and use the built-in single-channel down-conversion units to down-convert the sent radio frequency signal to an intermediate frequency signal, and send each obtained intermediate frequency signal to the single-channel acquisition and processing unit corresponding thereto in the multi-channel acquisition and processing module;

[0014] The multi-channel acquisition and processing module is used to collect, process, and analyze the incoming intermediate-frequency signals by using the built-in single-channel acquisition and processing units, and perform direction finding processing on the signal incident directions of the multi-channel radio frequency signals by using the phase interference method according to the multi-channel analysis results to obtain direction finding results.

[0015] Based on the above invention content, a new solution for intercepting and direction finding of discontinuous ultra-wideband pulses is provided, which includes an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas. The instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow-speed ADC unit, and an FPGA unit, and can implement a 5ns fast-response SDLVA video detection + high-speed 1-bit frequency measurement system to intercept discontinuous ultra-wideband pulses and extract relevant parameters. Furthermore, after fusing the pulse descriptor information with the direction finding results used to reflect the azimuth of the radiation source, the function of intercepting and direction finding of discontinuous ultra-wideband pulses can be formed, solving the problems of low intercept success probability of existing intercepting and direction finding systems for discontinuous ultra-wideband pulses and difficult signal alarm recognition and azimuth measurement even if intercepted.

[0016] In a possible design, a storage module and a comprehensive processing module are further included. Among them, the storage module is used to provide a data storage space;

[0017] The comprehensive processing module is respectively communicatively connected to the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and is used to make the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module work together internally.

[0018] In a possible design, a display control computer is further included. Among them, the display control computer is communicatively connected to the comprehensive processing module;

[0019] The comprehensive processing module is further used to perform data interaction with the display control computer externally;

[0020] The display control computer is used to provide a human-computer interaction interface for internally controlling the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and / or monitoring the states of the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module.

[0021] In a possible design, a power supply module is further included. Among them, the power supply module is used to complete the conversion of system power supply to supply power to each part in the system.

[0022] In a possible design, a fast pulse discharger is installed at each antenna port of the multi-element planar spiral antenna.

[0023] In a possible design, a detachable high-power resistant 10W limiter is installed in the RF routing and distribution module.

[0024] In a possible design, cable protectors are used at the input and output ports of each module, where each module includes the RF routing and distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module, and / or the multi-channel acquisition and processing module, and the cable protectors are protected by wave-absorbing sleeves.

[0025] In a possible design, there is also a chassis for housing the RF routing and distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module, and the multi-channel acquisition and processing module, where the chassis is an integrally welded ATR chassis.

[0026] In a possible design, an electromagnetic wave absorbing material layer is coated on the inner conductor wall of the hole and slot openings of the chassis.

[0027] In a possible design, the holes of the chassis are all circular or square holes, and the gaps of the chassis are all sealed with conductive sealing strips and kept at the same potential as the chassis shell.

[0028] Beneficial effects:

[0029] (1) The present invention provides a new solution for intercepting and direction-finding discontinuous ultra-wideband pulses, which includes an antenna array, an RF routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array is an interferometer antenna array composed of multi-element planar spiral antennas. The instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow-speed ADC unit, and an FPGA unit, and can implement a 5ns fast-response SDLVA video detection + high-speed 1-bit frequency measurement system to intercept discontinuous ultra-wideband pulses and extract relevant parameters. Furthermore, after fusing the pulse description word information with the direction-finding result for reflecting the azimuth of the radiation source, a function for intercepting and direction-finding discontinuous ultra-wideband pulses can be formed, solving the problems of low interception success probability of existing interception and direction-finding systems for discontinuous ultra-wideband pulses and difficult signal warning recognition and azimuth measurement even if intercepted.

[0030] (2) By making various protection improvements to the "front door" and "back door" of the system, effective protection can be provided against the penetration of high-power pulses at the "front door" and "back door" of the system, greatly reducing the possibility of system freeze or damage when irradiated by high power. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a system provided by the present invention for intercepting and direction finding of discontinuous ultra-wideband pulses.

[0033] Figure 2 It is a schematic structural diagram of an instantaneous frequency measurement module in the system provided by the present invention.

[0034] Figure 3 It is an example diagram of the result of SDLVA video detection based on a 5ns fast rise / fall time provided by the present invention.

[0035] Figure 4 It is an example diagram of the process of high-speed 1-bit instantaneous frequency measurement provided by the present invention. Detailed Embodiments

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawing structure is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the description of these embodiment modes is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0037] It should be understood that although terms such as first and second may be used herein to describe various objects, these objects should not be limited by these terms. These terms are only used to distinguish one object from another. For example, the first object can be called the second object, and similarly, the second object can be called the first object, without departing from the scope of the exemplary embodiments of the present invention.

[0038] It should be understood that for the term "and / or" that may appear in this text, it is merely a relational description of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, or both A and B exist simultaneously. For the term " / and" that may appear in this text, it describes another relational relationship of associated objects, indicating that two relationships can exist. For example, A / and B can represent two situations: A exists alone or both A and B exist simultaneously. Additionally, for the character " / " that may appear in this text, it generally indicates that the associated objects before and after are in an "or" relationship.

[0039] Embodiment 1:

[0040] As Figure 1 and 2 shown, the system provided in this embodiment and used for intercepting and direction finding of discontinuous ultra-wideband pulses includes, but is not limited to, an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas, each single-channel down-conversion unit in the multi-channel down-conversion module corresponds one-to-one with each element planar spiral antenna in the multi-element planar spiral antenna, and each single-channel acquisition and processing unit in the multi-channel acquisition and processing module corresponds one-to-one with each single-channel down-conversion unit.

[0041] As Figure 1 shown, in the specific structure of the system, for example, the antenna array adopts an interferometer antenna array composed of four-element planar spiral antennas (i.e., planar spiral antennas 1 to 4). At this time, there will be four single-channel down-conversion units in the multi-channel down-conversion module corresponding one-to-one with the four-element planar spiral antennas, and there will be four single-channel acquisition and processing units in the multi-channel acquisition and processing module corresponding one-to-one with the four single-channel down-conversion units. The antenna array is used to receive radio frequency signals radiated from space, and its operating frequency range can be, but is not limited to, 2 GHz to 18 GHz. The radio frequency routing and distribution module is electrically connected to the antenna array, the instantaneous frequency measurement module, and the multi-channel down-conversion module respectively, and is used to receive multiple radio frequency signals sent by the antenna array and corresponding one-to-one with the multi-element planar spiral antennas (as Figure 1 shown, that is, 4 radio frequency signals), send any one of the multiple radio frequency signals to the instantaneous frequency measurement module, and send each radio frequency signal in the multiple radio frequency signals to the single-channel down-conversion unit corresponding to it (i.e., the respective radio frequency signals) in the multi-channel down-conversion module.

[0042] The instantaneous frequency measurement module is electrically connected to the multi-channel down-conversion module and is used to measure the instantaneous frequency of the input radio frequency signal, and guide each single-channel down-conversion unit in the multi-channel down-conversion module to perform frequency down-conversion processing by using the measurement result of the instantaneous frequency of the signal. Among them, as Figure 2 shown, the instantaneous frequency measurement module includes, but is not limited to, a microwave channel unit, a high-speed ADC (Analog-to-Digital Converter) unit, a slow ADC unit, and an FPGA (Field Programmable Gate Array) unit; the microwave channel unit is electrically connected to the high-speed ADC unit and the slow ADC unit respectively, and is used to successively perform limiting, amplification, detection, and attenuation on the input radio frequency signal, and send the finally obtained radio frequency signal to the high-speed ADC unit, and send the detection signal obtained through the detection process to the slow ADC unit. Among them, the detection process adopts the SDLVA (Successive Detection Log Video Amplifier) video detection method based on a 5ns fast rise / fall time (that is, an existing detection method, and the relationship between the output result of the detection signal and time is as Figure 3 shown); the high-speed ADC unit is electrically connected to the FPGA unit and is used to perform high-speed 1-bit sampling processing on the input radio frequency signal (that is, a sampling method that does not need to be quantized into a multi-bit digital signal, but only needs to obtain the comparison logic value between the sampling point value and the preset threshold value: if the sampling point value is greater than the preset threshold value, it is logic 1, otherwise it is logic 0, as Figure 4As shown), a first digital signal is obtained, and the first digital signal is sent to the FPGA unit; the slow ADC unit is electrically connected to the FPGA unit, and is used to perform amplitude sampling processing on the sent detection signal to obtain a second digital signal, and the second digital signal is sent to the FPGA unit; the FPGA unit is used to process and fuse the first digital signal and the second digital signal to obtain a pulse description word (Pulse Description Word, PDW, which is the digitization of radar signal pulse parameter measurement by the radar reconnaissance receiver) information used as the instantaneous frequency measurement result of the signal, wherein the pulse description word information includes but is not limited to frequency, pulse width, amplitude and / or arrival time, etc. Considering that discontinuous ultra-wide spectrum pulses may have burst characteristics, 10ns pulse width and a certain dynamic range, the corresponding receiver is required to have the following characteristics: (a) frequency wide opening to ensure that the burst signal in the threat frequency band is not "missed"; (b) having the ability to measure the instantaneous frequency, amplitude, pulse width, arrival time and repetition period of narrow pulse width signals. Therefore, through the specific design of the instantaneous frequency measurement module, it is possible to intercept the discontinuous ultra-wide spectrum pulse and extract relevant parameters based on the 5ns fast response SDLVA video detection + high-speed 1bit frequency measurement system. Figure 2 As shown, the FPGA unit can send the pulse description word information in the form of LVTTL (Low Voltage TTL, i.e., 3.3V, 2.5V and lower voltage levels) signal through a JVPX socket (i.e., an existing connector of the JVPX series), and when receiving RIO (Region of Interest) interaction information, it is also used to feedback control the microwave channel unit to adjust the region of interest. In addition, the specific methods of the aforementioned limiting, amplification, detection, attenuation, sampling and fusion processing are all existing means.

[0043] The multi-channel down-conversion module is electrically connected to the multi-channel acquisition and processing module, and is used to provide a reference clock for the multi-channel acquisition and processing module, and to down-convert the incoming radio frequency signal to an intermediate frequency signal by using each built-in single-channel down-conversion unit, and to send each obtained intermediate frequency signal into the single-channel acquisition and processing unit in the multi-channel acquisition and processing module that corresponds to it (i.e., the intermediate frequency signals). The multi-channel acquisition and processing module is used to collect, process, and analyze the incoming intermediate frequency signal by using each built-in single-channel acquisition and processing unit, and to perform direction finding processing on the signal incident direction of the multi-channel radio frequency signal by using the phase interference method according to the multi-channel analysis results to obtain a direction finding result. The specific methods of the foregoing frequency down-conversion, signal acquisition, processing, analysis, and direction finding processing are all existing means. In this way, after fusing the pulse description word information with the direction finding result used to reflect the azimuth of the radiation source, a function of intercepting and direction finding for discontinuous ultra-wideband pulses can be formed, thereby solving the problems of low interception success probability of the existing interception and direction finding system for discontinuous ultra-wideband pulses and being difficult to perform signal alarm recognition and azimuth measurement even if intercepted. In addition, experiments show that the direction finding accuracy of the solution of this embodiment can reach 2° (r.m.s).

[0044] Preferably, a storage module and a comprehensive processing module are further included. Among them, the storage module is used to provide a data storage space for storing data such as the pulse description word information and the direction finding result. The comprehensive processing module is respectively communicatively connected to the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and is used to make the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module work together internally. Specifically, the comprehensive processing module can but is not limited to communicatively connecting the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module respectively by means of a bus. Further specifically, a display control computer is further included. Among them, the display control computer is communicatively connected to the comprehensive processing module. The comprehensive processing module is further used to perform data interaction with the display control computer externally. The display control computer is used to provide a human-computer interaction interface for internally controlling the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and / or monitoring the states of the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module.

[0045] Preferably, a power supply module is further included. Among them, the power supply module is used to complete the conversion of system power supply to supply power to each part in the system. Such as Figure 1As shown, for example, it can be used to complete the system power conversion from 220V / 50Hz input AC power to 12V output DC power, so as to power the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition processing module, the storage module, the integrated processing module and the display control computer.

[0046] Preferably, a fast pulse discharger is installed at each antenna port of the multi-element planar helical antenna. That is, in order to prevent high-power signals (which are not limited to high-power discontinuous ultra-wide spectrum pulse signals) from causing damage to the system itself, the aforementioned improvement is made to the "front door" of the system so that the large induced current generated by the high-power pulse signal enters the ground along a prescribed path. More specifically, a detachable high-power 10W limiter is also installed in the RF routing distribution module. Since the high-power 10W limiter is detachable, it can be replaced and disassembled at any time, which is convenient for quick replacement after damage.

[0047] Preferably, a cable protector is used at the input and output ports of each module, wherein each module may include, but is not limited to, the RF routing distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module and / or the multi-channel acquisition processing module, etc., and the cable protector is protected by a wave-proof sleeve. That is, in order to prevent high-power signals from causing damage to the system itself, the aforementioned improvement is also made to the system "back door". In addition, each module may also include the storage module, the comprehensive processing module and / or the power supply module, etc.

[0048] Preferably, it also includes a chassis for housing the RF routing distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module and the multi-channel acquisition processing module, wherein the chassis adopts an integrally welded ATR chassis (ARINCATR racking system, i.e. American Airlines Radio Company ARINC Civil aircraft specified in ARINC404 specification "Transport aircraft equipment chassis and mounting racks" developed by the "Aviation Electronics Engineering Committee" Avionics The standard chassis of the chassis object, rack, cooling air and connector). That is, in order to prevent high-power signals from causing damage to the system itself, the aforementioned improvements have also been made to the system "back door". Further optimization, in order to suppress the aperture enhancement effect, the inner conductor wall of the aperture of the chassis is coated with an absorbing material layer, and the holes of the chassis are all circular holes or square holes, and the gaps of the chassis are sealed with conductive sealing strips and maintained at the same potential as the chassis shell.

[0049] In summary, the system provided by this embodiment and used for intercepting and direction finding discontinuous ultra-wide spectrum pulses has the following technical effects:

[0050] (1) This embodiment provides a new solution for intercepting and direction-finding discontinuous ultra-wideband pulses, which includes an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas. The instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow-speed ADC unit, and an FPGA unit, and can implement a 5ns fast-response SDLVA video detection + high-speed 1-bit frequency measurement system to intercept discontinuous ultra-wideband pulses and extract relevant parameters. Furthermore, after fusing the pulse description word information with the direction-finding result used to reflect the azimuth of the radiation source, the function of intercepting and direction-finding discontinuous ultra-wideband pulses can be formed, solving the problems of low interception success probability of the existing interception and direction-finding system for discontinuous ultra-wideband pulses and the difficulty of signal warning recognition and azimuth measurement even if intercepted.

[0051] (2) By making various protection improvements to the "front door" and "back door" of the system, effective protection can be provided for the "front door" and "back door" penetration of high-power pulses, greatly reducing the possibility of system crash or damage when irradiated by high power.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for intercepting and direction finding of discontinuous ultra-wideband pulses, characterized in that, It includes an antenna array, a radio frequency routing and distribution module, an instantaneous frequency measurement module, a multi-channel down-conversion module, and a multi-channel acquisition and processing module. Among them, the antenna array adopts an interferometer antenna array composed of multi-element planar spiral antennas. Each single-channel down-conversion unit in the multi-channel down-conversion module corresponds one-to-one with each element planar spiral antenna in the multi-element planar spiral antenna. Each single-channel acquisition and processing unit in the multi-channel acquisition and processing module corresponds one-to-one with each single-channel down-conversion unit. The antenna array is used to receive radio frequency signals radiated from space. The radio frequency routing and distribution module is electrically connected to the antenna array, the instantaneous frequency measurement module, and the multi-channel down-conversion module respectively. It is used to receive multiple radio frequency signals sent by the antenna array and corresponding one-to-one with the multi-element planar spiral antennas, send any one of the multiple radio frequency signals to the instantaneous frequency measurement module, and send each of the multiple radio frequency signals to the corresponding single-channel down-conversion unit in the multi-channel down-conversion module. The instantaneous frequency measurement module is electrically connected to the multi-channel down-conversion module. It is used to measure the instantaneous frequency of the input radio frequency signal and use the instantaneous frequency measurement result of the signal to guide each single-channel down-conversion unit in the multi-channel down-conversion module to perform frequency down-conversion processing. Among them, the instantaneous frequency measurement module includes a microwave channel unit, a high-speed ADC unit, a slow-speed ADC unit, and an FPGA unit. The microwave channel unit is electrically connected to the high-speed ADC unit and the slow-speed ADC unit respectively. It is used to perform amplitude limiting, amplification, detection, and attenuation on the input radio frequency signal in sequence, send the finally obtained radio frequency signal to the high-speed ADC unit, and send the detection signal obtained through detection processing to the slow-speed ADC unit. Among them, the detection processing adopts the SDLVA video detection method based on a 5ns fast rise / fall time. The high-speed ADC unit is electrically connected to the FPGA unit. It is used to perform high-speed 1-bit sampling processing on the input radio frequency signal to obtain a first digital signal and send the first digital signal to the FPGA unit. The slow-speed ADC unit is electrically connected to the FPGA unit. It is used to perform amplitude sampling processing on the input detection signal to obtain a second digital signal and send the second digital signal to the FPGA unit. The FPGA unit is used to process and fuse the first digital signal and the second digital signal to obtain pulse description word information used as the instantaneous frequency measurement result of the signal. Among them, the pulse description word information includes frequency, pulse width, amplitude, and / or arrival time. The multi-channel down-conversion module is electrically connected to the multi-channel acquisition and processing module. It is used to provide a reference clock for the multi-channel acquisition and processing module, and use the built-in single-channel down-conversion units to down-convert the input radio frequency signal to an intermediate frequency signal, and send the obtained intermediate frequency signals to the corresponding single-channel acquisition and processing units in the multi-channel acquisition and processing module. The multi-channel acquisition and processing module is used to collect, process, and analyze the incoming intermediate-frequency signal by using each built-in single-channel acquisition and processing unit, and perform direction finding processing on the signal incident direction of the multi-channel radio frequency signal by using the phase interference method according to the multi-channel analysis results to obtain the direction finding result.

2. The system for intercepting and direction finding of discontinuous ultra-wideband pulses according to claim 1, characterized in that, It further includes a storage module and a comprehensive processing module. Among them, the storage module is used to provide a data storage space. The comprehensive processing module is respectively communicatively connected to the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and is used to make the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module work together internally.

3. The system for intercepting and direction finding of discontinuous ultra-wideband pulses according to claim 2, characterized in that, It further includes a display control computer. Among them, the display control computer is communicatively connected to the comprehensive processing module. The comprehensive processing module is further used to perform data interaction with the display control computer externally. The display control computer is used to provide a human-computer interaction interface for internally controlling the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module, and / or monitoring the states of the instantaneous frequency measurement module, the multi-channel down-conversion module, the multi-channel acquisition and processing module, and the storage module.

4. The system for intercepting and direction-finding of discontinuous ultra-wideband pulses according to claim 1, characterized in that, It further includes a power supply module. Among them, the power supply module is used to complete the conversion of system power supply to supply power to each part in the system.

5. The system for intercepting and direction finding of discontinuous ultra-wideband pulses according to claim 1, characterized in that, A fast pulse discharger is installed at each antenna port of the multi-element planar spiral antenna.

6. The system for intercepting and direction finding of discontinuous ultra-wideband spectrum pulses according to claim 1, wherein Cable protectors are used at the input and output ports of each module. Among them, each module includes the radio frequency routing and distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module, and / or the multi-channel acquisition and processing module, and the cable protector is protected by a wave-proof sleeve.

7. The system for intercepting and direction-finding of discontinuous ultra-wideband pulses according to claim 1, characterized in that It further includes a chassis for internally installing the radio frequency routing and distribution module, the instantaneous frequency measurement module, the multi-channel down-conversion module, and the multi-channel acquisition and processing module. Among them, the chassis adopts an integrally welded ATR chassis.

8. The system for intercepting and direction finding of discontinuous ultra-wideband pulses according to claim 7, characterized in that, An absorbing material layer is coated on the inner conductor wall of the hole and slot of the chassis.

9. The system for intercepting and direction finding of discontinuous ultra-wideband pulses according to claim 7, characterized in that, The holes of the chassis all adopt circular holes or square holes, and the gaps of the chassis are all sealed with conductive sealing strips and kept at the same potential as the chassis shell.

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