CN110018499B - Full-frequency-band passive detection and full-frequency-band reaction integrated system and method - Google Patents
Full-frequency-band passive detection and full-frequency-band reaction integrated system and method Download PDFInfo
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- CN110018499B CN110018499B CN201910389051.0A CN201910389051A CN110018499B CN 110018499 B CN110018499 B CN 110018499B CN 201910389051 A CN201910389051 A CN 201910389051A CN 110018499 B CN110018499 B CN 110018499B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a full-frequency-band passive detection and full-frequency-band reaction integrated system and a method, wherein the full-frequency-band passive detection system comprises a plurality of detection channels, detects a full-frequency-band radio frequency signal, detects the existence of the radio frequency signal, determines the parameter of the radio frequency signal, sorts out an intrusion signal, pairs the intrusion signals detected by the detection channels, and determines the airspace attribute of an intrusion target; under the guidance of a control instruction or a full-band passive detection system, the full-band countering system generates a countering signal corresponding to the characteristic of the intrusion target, and the intelligent countering of the low-altitude intrusion is completed. The invention can realize the full-frequency band effective detection and countermeasures of low-altitude intruders, has no frequency domain blind area, no blind frequency sweep interference, no energy waste and adverse environmental hazard, and effectively realizes the safety protection of government authorities, military facilities, energy reserves/stations, large commercial venues, private places and sensitive areas.
Description
Technical Field
The invention belongs to the technical field of low-altitude security defense, and particularly relates to a full-frequency-band passive detection and full-frequency-band reaction integrated system and method for security protection of government authorities, military facilities, energy reserves/stations, large commercial venues, private places and sensitive areas.
Background
The unmanned plane is a unmanned plane operated by using radio remote control equipment and a self-provided program control device, and is not provided with a cockpit, but is provided with equipment such as an autopilot, a program control device and the like, personnel on the ground, a naval vessel or a master remote control station can track, position, remotely control, remotely measure and digitally transmit the unmanned plane through radar and other equipment, can take off like a common plane under radio remote control or launch and lift off by using a booster rocket, can be brought to the air by the master to put into flight, can automatically land in the same mode as the landing process of the common plane, can be recovered through a parachute or a barrier net for remote control, can be repeatedly used for many times, and is widely used for air reconnaissance, monitoring, communication, anti-diving, electronic interference and the like.
In recent years, the continuous development of communication technology, integrated circuit technology, system-on-chip technology, three-dimensional printing technology and unmanned aerial vehicle technology enables unmanned aerial vehicles to have the characteristics of low manufacturing cost, easy acquisition, easy transformation and the like, so that unmanned aerial vehicles are widely applied in various aspects, the current situation of difficult control is formed, and social hazard is easily caused.
The existing unmanned aerial vehicle safety defense system and related technology take commercial unmanned aerial vehicle as detection and defense objects, the covered frequency range is ISM frequency band, the defense system has narrow covered frequency, the unmanned aerial vehicle can not be effectively detected and defended, in addition, the existing reaction system adopts sweep frequency to suppress interference and waste energy, and adverse environmental influence is easily caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a full-frequency-band passive detection and full-frequency-band reaction integrated system and method, which solve the problem of insufficient coverage capability of the existing low-altitude passive detection and reaction frequency spectrum.
The aim of the invention is achieved by the following technical scheme:
a full-frequency passive detection and full-frequency reaction integrated system and method adopts an integrated full-frequency passive detection system and full-frequency reaction system, wherein: the full-frequency-band passive detection system comprises a plurality of detection channels, detects the full-frequency-band radio frequency signals, detects the existence of the radio frequency signals, determines the parameters of the radio frequency signals, sorts out the intrusion signals, pairs the intrusion signals detected by the detection channels, and further determines the airspace attribute of the intrusion target; under the guidance of a control instruction or a full-band passive detection system, the full-band countering system generates a countering signal corresponding to the characteristic of the intrusion target, and the intelligent countering of the low-altitude intrusion is completed.
The specific technical scheme of the invention is as follows:
the full-frequency-band passive detection and full-frequency-band reaction integrated system comprises a full-frequency-band passive detection system and a full-frequency-band reaction system, wherein the full-frequency-band passive detection system comprises at least one frequency spectrum detection channel, and the frequency spectrum detection channel comprises a low-noise amplifier connected with an antenna; the full-band counter system comprises at least one counter-generation transmission channel, the counter-generation transmission channel comprises a power amplifier connected with an antenna, the low-noise amplifier of the detection channel is connected with a multifunctional radio frequency transceiver, the power amplifier of the transmission channel is connected with the multifunctional radio frequency transceiver, and the multifunctional radio frequency transceiver is connected with a processor.
In the above technical solution, the multifunctional radio frequency transceiver completes frequency conversion, gain control, filtering, digital-to-analog conversion, analog-to-digital conversion and calibration processing.
In the above technical scheme, the antenna is a 75MHz-30GHz broadband antenna, and the multifunctional radio frequency transceiver chip is one of AD9361, ADRV9009 and ADRV 9008.
In the above technical scheme, the spectrum detection channel comprises two receiving branches, which are divided into a 75MHz-6GHz branch and a 6GHz-30GHz branch, the 75MHz-6GHz branch is connected with a single-pole double-throw switch after being sequentially connected with a 75MHz-6GHz broadband antenna and a low noise amplifier, the 6GHz-30GHz branch is connected with a single-pole double-throw switch after being sequentially connected with a 6GHz-30GHz broadband antenna, a low noise amplifier and a frequency converter, and the single-pole double-throw switch is connected with a multifunctional radio frequency transceiver through a filter.
In the technical scheme, the counter-generation transmitting channel comprises two branches, the branches are divided into 75MHz-6GHz branches and 6GHz-30GHz branches, the 75MHz-6GHz branches are connected with a single-pole double-throw switch after being sequentially connected with a 75MHz-6GHz broadband antenna, a power amplifier and a filter, the 6GHz-30GHz branches are connected with a single-pole double-throw switch after being sequentially connected with a 6GHz-30GHz broadband antenna, a power amplifier, a filter and a frequency converter, and the single-pole double-throw switch is connected with a multifunctional radio-frequency transceiver.
A full-frequency-band passive detection and full-frequency-band reaction method comprises the following steps:
q1, carrying out narrowband processing on a broadband signal of a low-altitude target received by a frequency spectrum detection channel by a full-frequency-band passive detection system, then determining whether the signal exists or not, then determining characteristic parameters of the signal, and finally judging whether a signal source is an intrusion target according to the signal characteristics;
q2, if the signal source is determined to be the radio frequency signal of the intrusion target, the signal characteristics of all frequency spectrum detection channels of the full-band passive detection system are paired, the signal characteristics of the same intrusion target in different frequency spectrum detection channels are determined, and the spatial domain attribute of the intrusion target is determined by utilizing the signal characteristics of the same intrusion target in different frequency spectrum detection channels;
q3, determining a countering channel, generating a countering instruction corresponding to the signal characteristics of the intrusion target according to the characteristic parameters of the intrusion target, and transmitting a countering signal through a countering transmitting channel selected by the full-band countering system to finish countering the intrusion target.
In the above technical solution, in the Q1, in the processor, a short-time fourier transform is used to perform narrowband processing on a wideband signal received by the spectrum detection channel, so as to transform the wideband signal into a P-path narrowband signal, where P is a natural number not less than 16; when determining whether a signal exists or not, the method is realized by calculating the amplitude of the P paths of narrow-band signals, and specifically comprises the following steps: comparing the amplitude of the P paths of signals with a preset threshold, judging that a signal exists when the amplitude of the narrowband signal is larger than the threshold, and recording the system time when the existence of the signal is confirmed, namely the signal reaching time; when the signal characteristics are determined, the center frequency of an intermediate channel in which the existence of the signal is continuously detected in the P paths of narrow-band signals is used as the center frequency of the signal, so that whether the broadband signal received by the frequency spectrum detection channel is a signal of an intrusion target is judged according to the detected signal characteristics.
In the above technical solution, in the Q2, after signal pairing is completed according to the signal of the intrusion target, the position or direction of the intrusion target is calculated by using a time difference algorithm for the intrusion target successfully paired, so as to determine the airspace attribute of the intrusion target.
In the above technical solution, in Q3, when determining the reaction channel, the reaction channel selecting system determines the external reaction instruction or is intelligently determined by the processor, the processor calculates the included angle between the connecting line from the phase center of each reaction channel to the intrusion target and the normal direction of the antenna of the reaction channel by adopting a straight line included angle method, and selects the reaction channel with the smallest included angle as the channel for implementing the reaction.
In the above technical solution, when generating the countering signal corresponding to the feature of the intrusion target signal in Q3, under the control of the countering instruction of the system external or full-band passive detection system, the processor generates the countering signal, where the countering instruction includes specific fields: GPS interference enabling, GLONASS interference enabling, beidou interference enabling, galileo interference enabling, forwarding interference enabling, modulation interference enabling, composite navigation interference power control words, forwarding interference power control words, modulation patterns of modulation interference, pseudo code generating polynomials of modulation interference, GPS pseudo code sequence numbers, beidou pseudo code sequence numbers, galileo pseudo code sequence numbers, GLONASS pseudo code sequence numbers, interference frequencies and interference bandwidths;
if the GPS interference enabling field contained in the instruction enables GPS interference, enabling the GPS pseudo code generating module to load a GPS pseudo code generating polynomial specified by a standard according to the GPS pseudo code serial number contained in the instruction, generating a GPS pseudo code, and outputting a pseudorandom sequence expressed by +/-1 after BPSK modulation;
if the GLONASS interference enabling field contained in the instruction enables GLONASS interference, enabling a GLONASS pseudo code generation module, loading a standard GLONASS pseudo code generation polynomial to generate a GLONASS pseudo code according to the GLONASS pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence expressed by +/-1;
if the GLONASS interference enabling field contained in the instruction does not enable the GLONASS interference, the output of the GLONASS pseudo code generation module is constant to 0; if the Beidou interference enabling field contained in the instruction enables Beidou interference, enabling a Beidou pseudo code generation module to load a standard Beidou pseudo code generation polynomial to generate a Beidou pseudo code according to the Beidou pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence represented by +/-1;
if the Beidou interference enabling field contained in the instruction does not enable Beidou interference, the output of the Beidou pseudo code generation module is constant to 0;
if the Galileo interference enabling field contained in the instruction enables Galileo interference, enabling a Galileo pseudo code generation module, loading a standard Galileo pseudo code generation polynomial to generate a Galileo pseudo code according to the Galileo pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence expressed by +/-1;
if Galileo interference is not enabled by a Galileo interference enabling field contained in the instruction, the output of the Galileo pseudo code generation module is constantly 0; then, summing the outputs of the GPS pseudo code generation module, the GLONASS pseudo code generation module, the Beidou pseudo code generation module and the Galileo pseudo code generation module; then, normalizing the sum signal to make the maximum value equal to the full-scale input of a digital-to-analog converter contained in the multifunctional radio frequency transceiver, and multiplying the sum signal by a composite navigation interference power control word contained in the instruction;
if the forwarding interference enabling field contained in the instruction enables forwarding interference, a received signal passes through a filter, the center frequency of the filter is set to be the interference frequency contained in the instruction, the bandwidth of the filter is set to be the interference bandwidth contained in the instruction, the output of the filter is normalized, the maximum value of the output of the filter is equal to the full-scale input of the digital-to-analog converter contained in the multifunctional radio frequency transceiver, and the maximum value is multiplied by the forwarding interference power control word contained in the instruction; if the forwarding interference enabling field contained in the instruction does not enable forwarding interference, the output of the branch is constantly 0;
if the modulation interference enabling field contained in the instruction enables modulation interference, initializing a linear feedback shift register to generate a pseudo-random sequence by a pseudo-code generating module according to the pseudo-code generating polynomial of the modulation interference contained in the instruction, normalizing modulation output after modulation of a modulation pattern contained in the instruction, enabling the maximum value of the modulation output to be equal to the full-scale input of a digital converter contained in the multifunctional radio frequency transceiver, and multiplying the full-scale input by a modulation interference power control word contained in the instruction; if the modulation interference enabling field contained in the instruction does not enable modulation interference, the output of the branch is constantly 0;
and finally, summing the signals of the three branches to generate a composite interference signal, and sending the composite interference signal to a reaction transmitting channel to transmit the composite interference signal to finish intelligent reaction of the low-altitude target.
The invention can realize the full-frequency band effective detection and countermeasures of low-altitude intruders, has no frequency domain blind area, no blind frequency sweep interference, no energy waste and adverse environmental hazard, and effectively realizes the safety protection of government authorities, military facilities, energy reserves/stations, large commercial venues, private places and sensitive areas.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a flow chart of generating a counter signal calculation corresponding to an intrusion target signal feature;
fig. 4 is a schematic structural view of embodiment 2 of the present invention;
fig. 5 is a schematic structural view of embodiment 3 of the present invention;
fig. 6 is a schematic structural view of embodiment 4 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings and examples, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the embodiment shown in fig. 1, a full-band passive detection and full-band reaction integrated system comprises a full-band passive detection system and a full-band reaction system, wherein the full-band passive detection system comprises two frequency spectrum detection channels, and the frequency spectrum detection channels comprise low-noise amplifiers connected with antennas; the full-band counter system comprises two counter-generation transmission channels, wherein the counter-generation transmission channels comprise power amplifiers connected with antennas, the low-noise amplifiers of the detection channels are connected with a multifunctional radio-frequency transceiver, the power amplifiers of the transmission channels are connected with the multifunctional radio-frequency transceiver, and the multifunctional radio-frequency transceiver is used for completing frequency conversion, gain control, filtering, digital-to-analog conversion, analog-to-digital conversion and calibration processing, and is connected with a processor.
The antenna is a 75MHz-30GHz broadband antenna, and the multifunctional radio frequency transceiver can be an AD9361, ADRV9009 or ADRV9008 chip, or can be a chip or an upgrade chip similar to the chip comprising the functions of the AD9361, ADRV9009 or ADRV9008 chip.
A full-frequency-band passive detection and full-frequency-band reaction method comprises the following steps:
q1, carrying out narrowband processing on a broadband signal of a low-altitude target received by a frequency spectrum detection channel by a full-frequency-band passive detection system, determining whether signals exist and characteristic parameters of the signals, judging whether a signal source is an intrusion target according to signal characteristics, and carrying out narrowband processing on the broadband signal received by the frequency spectrum detection channel by adopting short-time Fourier transform in a processor to convert the broadband signal into a P-path narrowband signal, wherein P is a natural number not less than 16; when determining whether a signal exists or not, the method is realized by calculating the amplitude of the P paths of narrow-band signals, and specifically comprises the following steps: comparing the amplitude of the P paths of signals with a preset threshold, judging that a signal exists when the amplitude of the narrowband signal is larger than the threshold, and recording the system time when the existence of the signal is confirmed, namely the signal reaching time; when the signal characteristics are determined, the center frequency of an intermediate channel in which the existence of the signal is continuously detected in the P paths of narrow-band signals is used as the center frequency of the signal, so that whether the broadband signal received by the frequency spectrum detection channel is a signal of an intrusion target is judged according to the detected signal characteristics;
q2, if the signal source is the radio frequency signal of the intrusion target, the signal characteristics of all frequency spectrum detection channels of the full-band passive detection system are paired, the signal characteristics of the same intrusion target in different frequency spectrum detection channels are determined, the signal characteristics of the same intrusion target in different frequency spectrum detection channels are utilized, after the signal pairing of the signals of the intrusion target is completed, the position or direction of the intrusion target which is successfully paired is calculated for the intrusion target, the time difference algorithm is utilized to calculate the position or direction of the intrusion target, so that the airspace attribute of the intrusion target is determined, the radio frequency signals which are determined to be from the intrusion target are paired for the signal characteristics of a plurality of detection channels, the signal characteristics of the same intrusion target in different detection channels are determined, and finally the airspace attribute of the intrusion target is determined by utilizing the signal characteristics of the same intrusion target in different detection channels.
And determining signal characteristics of the same intrusion target in different detection channels, carrying out signal pairing on signals which are confirmed to be from the intrusion target by all channels, and simultaneously, successfully pairing signals which meet the conditions that the relative frequency error is smaller than a preset threshold (for example, 1%) and the arrival time difference is smaller than the threshold (for example, 100 us), and confirming that the signals are from the same intrusion target.
The method for calculating the relative frequency error comprises the following steps:wherein (1)>Represents the center frequency of the signal determined by the ith detection channel,/->Represents the center frequency of the signal determined by the jth detection channel,/for the signal>Representation->And->Is a maximum value of (a).
The method for calculating the arrival time difference comprises the following steps: i T i -T j I, wherein T i Representing the time of arrival, T, of the signal determined by the ith detection channel j Indicating the time of arrival of the signal determined by the jth detection channel.
And determining airspace attributes of the intrusion targets, and after signal pairing is completed, calculating the position or direction of the intrusion targets by using a time difference of arrival (TDOA) algorithm for the intrusion targets successfully paired.
Q3, determining a reaction channel, generating reaction instructions corresponding to the characteristics of the signal of the intrusion target according to the characteristic parameters of the intrusion target, transmitting reaction signals through all reaction transmitting channels of the full-band reaction system, finishing reaction of the intrusion target, determining the reaction channel by the reaction channel selection system, determining the external reaction instructions or intelligently determining the reaction channel by a processor, calculating the included angle between the connecting line of the phase center of each reaction channel to the intrusion target and the normal direction of an antenna of the reaction channel by the processor by adopting a straight line included angle method, and selecting the reaction channel with the minimum included angle as the channel for implementing reaction; the signal parameters determined by the detection channel are one by one and the normalized distance is calculated with the characteristic parameters in the electromagnetic background signal library, and the calculation method is as follows:
in the above formula, H represents the number of parameters, and H is a natural number; a is that h An H parameter representing the signal, H being a natural number not greater than H; b (B) h Representing the h in the characteristic parameters in the electromagnetic background signal libraryParameters.
If the normalized distance between the signal parameters determined by the channel and the feature parameters extracted from the electromagnetic background signal library is smaller than a preset threshold (for example, 20%), the signal is confirmed to be the electromagnetic background signal, and if the normalized distance between the signal parameters determined by the channel and all the feature parameters stored in the electromagnetic background signal library is larger than the preset threshold, the signal is confirmed to come from an intrusion target.
According to fig. 3, when generating a countering signal corresponding to the feature of the intrusion target signal, under the control of a countering instruction of the passive detection system outside the system or in the full frequency band, the processor generates the countering signal, where the countering instruction includes specific fields: GPS interference enabling, GLONASS interference enabling, beidou interference enabling, galileo interference enabling, forwarding interference enabling, modulation interference enabling, composite navigation interference power control words, forwarding interference power control words, modulation patterns of modulation interference, pseudo code generating polynomials of modulation interference, GPS pseudo code sequence numbers, beidou pseudo code sequence numbers, galileo pseudo code sequence numbers, GLONASS pseudo code sequence numbers, interference frequencies and interference bandwidths;
if the GPS interference enabling field contained in the instruction enables GPS interference, enabling the GPS pseudo code generating module to load a GPS pseudo code generating polynomial specified by a standard according to the GPS pseudo code serial number contained in the instruction, generating a GPS pseudo code, and outputting a pseudorandom sequence expressed by +/-1 after BPSK modulation;
for example, if the GPS pseudo code number included in the instruction is 31, the generation polynomials of the GPS pseudo code are set to g1=1+x respectively 3 +X 10 ，G2＝1+X 2 +X 3 +X 6 +X 8 +X 9 +X 10 The initial value of the register is all 0, the code phase is 3 and 8, and the pseudo code corresponding to the No. 31 GPS satellite is generated; if the GPS interference enabling field contained in the instruction does not enable the GPS interference, the output of the GPS pseudo code generating module is constantly 0; similarly, if the GLONASS interference enabling field contained in the instruction enables GLONASS interference, enabling a GLONASS pseudo code generation module, loading a standard GLONASS pseudo code generation polynomial to generate a GLONASS pseudo code according to the GLONASS pseudo code sequence number contained in the instruction, and outputting a pseudo random sequence expressed by +/-1; if finger is usedEnabling the GLONASS interference enabling field not to enable the GLONASS interference, wherein the output of the GLONASS pseudo code generation module is constantly 0; if the Beidou interference enabling field contained in the instruction enables Beidou interference, enabling a Beidou pseudo code generation module to load a standard Beidou pseudo code generation polynomial to generate a Beidou pseudo code according to the Beidou pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence represented by +/-1; if the Beidou interference enabling field contained in the instruction does not enable Beidou interference, the output of the Beidou pseudo code generation module is constant to 0; if the Galileo interference enabling field contained in the instruction enables Galileo interference, enabling a Galileo pseudo code generation module, loading a standard Galileo pseudo code generation polynomial to generate a Galileo pseudo code according to the Galileo pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence expressed by +/-1; if Galileo interference is not enabled by a Galileo interference enabling field contained in the instruction, the output of the Galileo pseudo code generation module is constantly 0; then, summing the outputs of the GPS pseudo code generation module, the GLONASS pseudo code generation module, the Beidou pseudo code generation module and the Galileo pseudo code generation module; then, normalizing the sum signal to make the maximum value equal to the full-scale input of a digital-to-analog converter contained in the multifunctional radio frequency transceiver, and multiplying the sum signal by a composite navigation interference power control word contained in the instruction;
if the forwarding interference enabling field contained in the instruction enables forwarding interference, a received signal passes through a filter, the center frequency of the filter is set to be the interference frequency contained in the instruction, the bandwidth of the filter is set to be the interference bandwidth contained in the instruction, the output of the filter is normalized, the maximum value of the output of the filter is equal to the full-scale input of the digital-to-analog converter contained in the multifunctional radio frequency transceiver, and the maximum value is multiplied by the forwarding interference power control word contained in the instruction; if the forwarding interference enabling field contained in the instruction does not enable forwarding interference, the output of the branch is constantly 0;
if the modulation interference enabling field contained in the instruction enables modulation interference, initializing a linear feedback shift register to generate a pseudo-random sequence by a pseudo-code generating module according to the pseudo-code generating polynomial of the modulation interference contained in the instruction, normalizing modulation output after modulation of a modulation pattern contained in the instruction, enabling the maximum value of the modulation output to be equal to the full-scale input of a digital converter contained in the multifunctional radio frequency transceiver, and multiplying the full-scale input by a modulation interference power control word contained in the instruction; if the modulation interference enabling field contained in the instruction does not enable modulation interference, the output of the branch is constantly 0;
and finally, summing the signals of the three branches to generate a composite interference signal, and sending the composite interference signal to a reaction transmitting channel to transmit the composite interference signal to finish intelligent reaction of the low-altitude target.
The specific embodiment is as follows:
example 1:
according to the embodiments shown in fig. 1 and fig. 2, in the protection area, the full-band passive detection and full-band reaction integrated system is an integrated station sharing hardware, that is, the full-band detection and full-band reaction integrated station is formed, the full-band passive detection system includes a spectrum detection station formed by two spectrum detection channels, each spectrum detection channel is a 75MHz-6GHz antenna connected with a low noise amplifier, and the low noise amplifier is connected with a multifunctional radio frequency transceiver; the full-frequency band reaction system comprises a reaction station formed by two reaction transmission channels, each reaction transmission channel is a 75MHz-6GHz antenna connected with a power amplifier, the frequency spectrum detection channel and the reaction transmission channels share a multifunctional radio frequency transceiver, and the multifunctional radio frequency transceiver is used for completing frequency conversion, gain control, filtering, digital-analog conversion, analog-digital conversion and calibration processing and is connected with a processor.
Each spectrum detection station can detect radio frequency signals in the frequency range of 75MHz-6GHz, each reaction station can generate reaction signals in the frequency range of 75MHz-6GHz, and the spectrum detection station and the reaction station are integrated stations sharing hardware. The radio frequency signals of each spectrum detection channel are sequentially received by a 75MHz-6GHz broadband antenna, filtered and amplified by a low noise amplifier, then sent to a multifunctional radio frequency transceiver to complete frequency conversion, gain control, filtering and analog-to-digital conversion, and then sent to a processor after being processed by the multifunctional radio frequency transceiver; each of the conversion stations comprises two conversion transmitting channels, and after the processor of each conversion transmitting channel generates conversion digital signals, the digital signals are sent to the multifunctional radio frequency transceiver to complete frequency conversion, gain control, filtering and analog-to-digital conversion, and after the digital signals are processed by the multifunctional radio frequency transceiver, the digital signals are sent to the power amplifier and the antenna to complete the generation of the conversion signals.
Example 2:
according to fig. 4, in the protection area, the full-band passive detection and full-band reaction integrated system is an integrated station sharing hardware, namely, the full-band detection and full-band reaction integrated station is formed, the full-band passive detection system comprises a frequency spectrum detection station formed by four frequency spectrum detection channels, each frequency spectrum detection channel is a 75MHz-6GHz antenna and is connected with a low noise amplifier, and the low noise amplifier is connected with a multifunctional radio frequency transceiver; the full-frequency band reaction system comprises a reaction station formed by four reaction transmission channels, each reaction transmission channel is a 75MHz-6GHz antenna connected with a power amplifier, the frequency spectrum detection channel and the reaction transmission channel respectively use a multifunctional radio frequency transceiver, the multifunctional radio frequency transceiver finishes the frequency conversion, gain control, filtering, digital-to-analog conversion, analog-to-digital conversion and calibration treatment, and the two multifunctional radio frequency transceivers are respectively connected with a processor.
Example 3:
according to the illustration shown in fig. 5, the full-band passive detection and full-band reaction integrated system is an integrated station sharing hardware, namely, the full-band detection and full-band reaction integrated station is formed, the full-band passive detection system comprises a frequency spectrum detection station formed by two frequency spectrum detection channels, the detection frequency range is expanded to 75MHz-30GHz, each radio frequency reaction station can generate reaction signals in the frequency range of 75MHz-30GHz, each frequency spectrum detection channel comprises two receiving channels, each receiving channel is divided into a 75MHz-6GHz branch and a 6GHz-30GHz branch, the 75MHz-6GHz branch is a 75MHz-6GHz broadband antenna connected with a low noise amplifier, the low noise amplifier is connected with a single-pole double-throw switch, the 6GHz-30GHz branch is a 6GHz-30GHz broadband antenna connected with a low noise amplifier, the low noise amplifier is connected with a frequency converter, the frequency converter is connected with the single-pole double-throw switch, the single-pole double-throw switch is connected with a filter, and the two filters are connected with a multifunctional radio frequency transceiver; the reverse transmission channel comprises two transmission channels, each transmission channel is divided into a 75MHz-6GHz branch and a 6GHz-30GHz branch, the 75MHz-6GHz branch is connected with a power amplifier by a 75MHz-6GHz broadband antenna, the power amplifier is connected with a filter, the filter is connected with a single-pole double-throw switch, the 6GHz-30GHz branch is connected with the power amplifier by a 6GHz-30GHz broadband antenna, the power amplifier is connected with a filter, the filter is connected with a frequency converter, the frequency converter is connected with the single-pole double-throw switch, the two single-pole double-throw switches are connected with a multifunctional radio-frequency transceiver, and the multifunctional radio-frequency transceiver is connected with a processor.
Example 4:
according to the embodiment shown in fig. 6, the full-band passive detection and full-band reaction integrated system is an integrated station sharing hardware, namely, the full-band detection and full-band reaction integrated station is formed, the full-band passive detection system comprises a frequency spectrum detection station formed by four frequency spectrum detection channels, the detection frequency range is expanded to 75MHz-30GHz, each radio frequency reaction station can generate reaction signals in the frequency range of 75MHz-30GHz, each frequency spectrum detection channel comprises four receiving channels, each receiving channel is divided into a 75MHz-6GHz branch and a 6GHz-30GHz branch, the 75MHz-6GHz branch is a 75MHz-6GHz broadband antenna connected with a low noise amplifier, the low noise amplifier is connected with a single pole double throw switch, the 6GHz-30GHz branch is a 6GHz-30GHz broadband antenna connected with a low noise amplifier, the low noise amplifier is connected with a frequency converter, the frequency converter is connected with the single pole double throw switch, the single pole double throw switch is connected with a filter, and the two filters are connected with a multifunctional radio frequency transceiver; the reverse-generation transmission channel comprises four transmission channels, each transmission channel is divided into a 75MHz-6GHz branch and a 6GHz-30GHz branch, the 75MHz-6GHz branch is a 75MHz-6GHz broadband antenna connected with a power amplifier, the power amplifier is connected with a filter, the filter is connected with a single-pole double-throw switch, the 6GHz-30GHz branch is a 6GHz-30GHz broadband antenna connected with the power amplifier, the power amplifier is connected with a filter, the filter is connected with a frequency converter, the frequency converter is connected with the single-pole double-throw switch, the two single-pole double-throw switches are connected with a multifunctional radio frequency transceiver, the frequency spectrum detection channel and the reverse-generation transmission channel are respectively connected with a processor by using one multifunctional radio frequency transceiver, and the two multifunctional radio frequency transceivers are respectively connected with the processor.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A full-frequency-band passive detection and full-frequency-band reaction integrated method is characterized by comprising the following steps of:
the system comprises a full-frequency-band passive detection system and a full-frequency-band reaction system, wherein the full-frequency-band passive detection system comprises at least one frequency spectrum detection channel, and the frequency spectrum detection channel comprises a low-noise amplifier connected with an antenna; the full-band counter system comprises at least one counter-generation transmission channel, wherein the counter-generation transmission channel comprises a power amplifier connected with an antenna, the low-noise amplifier of the detection channel is connected with a multifunctional radio frequency transceiver, the power amplifier of the transmission channel is connected with the multifunctional radio frequency transceiver, and the multifunctional radio frequency transceiver is connected with a processor;
the method comprises the following steps:
q1, carrying out narrowband processing on a broadband signal of a low-altitude target received by a frequency spectrum detection channel by a full-frequency-band passive detection system, then determining whether the signal exists or not, then determining characteristic parameters of the signal, and finally judging whether a signal source is an intrusion target according to the signal characteristics;
q2, if the signal source is determined to be the radio frequency signal of the intrusion target, the signal characteristics of all frequency spectrum detection channels of the full-band passive detection system are paired, the signal characteristics of the same intrusion target in different frequency spectrum detection channels are determined, and the spatial domain attribute of the intrusion target is determined by utilizing the signal characteristics of the same intrusion target in different frequency spectrum detection channels;
q3, determining a countering channel, generating a countering instruction corresponding to the characteristics of the signal of the intrusion target according to the characteristic parameters of the intrusion target, and transmitting a countering signal through a countering transmitting channel selected by the full-band countering system to finish countering the intrusion target;
in the Q1, in a processor, carrying out narrowband processing on a broadband signal received by a frequency spectrum detection channel by adopting short-time Fourier transform, and converting the broadband signal into a P-path narrowband signal, wherein P is a natural number not less than 16; when determining whether a signal exists or not, the method is realized by calculating the amplitude of the P paths of narrow-band signals, and specifically comprises the following steps: comparing the amplitude of the P paths of signals with a preset threshold, judging that a signal exists when the amplitude of the narrowband signal is larger than the threshold, and recording the system time when the existence of the signal is confirmed, namely the signal reaching time; when the signal characteristics are determined, the center frequency of an intermediate channel in which the existence of the signal is continuously detected in the P paths of narrow-band signals is used as the center frequency of the signal, so that whether the broadband signal received by the frequency spectrum detection channel is a signal of an intrusion target is judged according to the detected signal characteristics;
the bandwidths of the frequency spectrum detection channel and the reverse transmission channel are 75MHz-30GHz, and the multifunctional radio frequency transceiver chip is one of AD9361, ADRV9009 or ADRV 9008;
the frequency spectrum detection channel comprises two receiving branches, wherein the receiving branches are divided into 75MHz-6GHz branches and 6GHz-30GHz branches, the 75MHz-6GHz branches are a 75MHz-6GHz broadband antenna and a low noise amplifier which are sequentially connected and then connected with a single-pole double-throw switch, the 6GHz-30GHz branches are a 6GHz-30GHz broadband antenna, a low noise amplifier and a frequency converter which are sequentially connected and then connected with a single-pole double-throw switch, and the single-pole double-throw switch is connected with a multifunctional radio-frequency transceiver through a filter;
the reverse-generation transmitting channel comprises two branches, the branches are divided into 75MHz-6GHz branches and 6GHz-30GHz branches, the 75MHz-6GHz branches are connected with a single-pole double-throw switch after being sequentially connected with a 75MHz-6GHz broadband antenna, a power amplifier and a filter, the 6GHz-30GHz branches are connected with a single-pole double-throw switch after being sequentially connected with a 6GHz-30GHz broadband antenna, a power amplifier, a filter and a frequency converter, and the single-pole double-throw switch is connected with a multifunctional radio-frequency transceiver.
2. The full-band passive detection and full-band reflection integrated method as claimed in claim 1, wherein the method comprises the following steps: in the Q2, after signal pairing is completed according to the signals of the intrusion targets, the position or direction of the intrusion targets which are successfully paired are calculated by utilizing a time difference algorithm, so that the airspace attribute of the intrusion targets is determined.
3. The full-band passive detection and full-band reflection integrated method as claimed in claim 2, wherein the method comprises the following steps: in the step Q3, when the counter channel is determined, the external counter instruction of the counter channel selection system is determined or intelligently determined by a processor, the processor calculates the included angle between the connecting line from the phase center of each counter channel to the intrusion target and the normal direction of the antenna of the counter channel by adopting a straight line included angle method, and the counter channel with the smallest included angle is selected as the channel for implementing counter.
4. A full-band passive detection and full-band reflection integrated method according to claim 3, characterized in that: in the Q3, when a countering signal corresponding to the feature of the intrusion target signal is generated, under the control of an external system or full-band passive detection system countering instruction, the processor generates the countering signal, where the countering instruction includes specific fields: GPS interference enabling, GLONASS interference enabling, beidou interference enabling, galileo interference enabling, forwarding interference enabling, modulation interference enabling, composite navigation interference power control words, forwarding interference power control words, modulation patterns of modulation interference, pseudo code generating polynomials of modulation interference, GPS pseudo code sequence numbers, beidou pseudo code sequence numbers, galileo pseudo code sequence numbers, GLONASS pseudo code sequence numbers, interference frequencies and interference bandwidths;
if the GPS interference enabling field contained in the instruction enables GPS interference, enabling the GPS pseudo code generating module to load a GPS pseudo code generating polynomial specified by a standard according to the GPS pseudo code serial number contained in the instruction, generating a GPS pseudo code, and outputting a pseudorandom sequence expressed by +/-1 after BPSK modulation;
if the GLONASS interference enabling field contained in the instruction enables GLONASS interference, enabling a GLONASS pseudo code generation module, loading a standard GLONASS pseudo code generation polynomial to generate a GLONASS pseudo code according to the GLONASS pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence expressed by +/-1;
if the GLONASS interference enabling field contained in the instruction does not enable the GLONASS interference, the output of the GLONASS pseudo code generation module is constant to 0; if the Beidou interference enabling field contained in the instruction enables Beidou interference, enabling a Beidou pseudo code generation module to load a standard Beidou pseudo code generation polynomial to generate a Beidou pseudo code according to the Beidou pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence represented by +/-1;
if the Beidou interference enabling field contained in the instruction does not enable Beidou interference, the output of the Beidou pseudo code generation module is constant to 0;
if the Galileo interference enabling field contained in the instruction enables Galileo interference, enabling a Galileo pseudo code generation module, loading a standard Galileo pseudo code generation polynomial to generate a Galileo pseudo code according to the Galileo pseudo code sequence number contained in the instruction, and outputting a pseudorandom sequence expressed by +/-1;
if Galileo interference is not enabled by a Galileo interference enabling field contained in the instruction, the output of the Galileo pseudo code generation module is constantly 0; then, summing the outputs of the GPS pseudo code generation module, the GLONASS pseudo code generation module, the Beidou pseudo code generation module and the Galileo pseudo code generation module; then, normalizing the sum signal to make the maximum value equal to the full-scale input of a digital-to-analog converter contained in the multifunctional radio frequency transceiver, and multiplying the sum signal by a composite navigation interference power control word contained in the instruction;
if the forwarding interference enabling field contained in the instruction enables forwarding interference, a received signal passes through a filter, the center frequency of the filter is set to be the interference frequency contained in the instruction, the bandwidth of the filter is set to be the interference bandwidth contained in the instruction, the output of the filter is normalized, the maximum value of the output of the filter is equal to the full-scale input of the digital-to-analog converter contained in the multifunctional radio frequency transceiver, and the maximum value is multiplied by the forwarding interference power control word contained in the instruction; if the forwarding interference enabling field contained in the instruction does not enable forwarding interference, the output of the branch is constantly 0;
if the modulation interference enabling field contained in the instruction enables modulation interference, initializing a linear feedback shift register to generate a pseudo-random sequence by a pseudo-code generating module according to the pseudo-code generating polynomial of the modulation interference contained in the instruction, normalizing modulation output after modulation of a modulation pattern contained in the instruction, enabling the maximum value of the modulation output to be equal to the full-scale input of a digital converter contained in the multifunctional radio frequency transceiver, and multiplying the full-scale input by a modulation interference power control word contained in the instruction; if the modulation interference enabling field contained in the instruction does not enable modulation interference, the output of the branch is always 0.
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