CN115378542A - C + X composite waveband interference method and interference equipment - Google Patents
C + X composite waveband interference method and interference equipment Download PDFInfo
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Abstract
The invention provides an interference method of a C + X composite wave band, which comprises the following steps: s1, receiving an X-band signal and a C-band signal, and synchronously and respectively outputting TTL detection signals of two frequency bands; s2, judging the source of the C-band signal and the X-band signal to generate PDW data and a zone bit; s3, if the TTL detection signal is 1, setting parameters to respectively generate sampling interference wave gates of a C wave band and an X wave band; s4, distinguishing and processing through the flag bits in the messages, and sending the processed C-band messages and the processed X-band messages to a signal processing module; s5, generating a C-band deception noise signal and an X-band deception noise signal; and S6, transmitting the deception and noise signals. Meanwhile, the invention also provides interference equipment of the C + X composite wave band. Through the technical scheme, the problem that harmonic waves can interfere with the X wave band when the C wave band works is solved, the interference efficiency of interference equipment is improved, and the target drone can be adapted to more types of target drone.
Description
Technical Field
The invention relates to the technical field of radar signal processing, in particular to interference equipment and an interference method for a C + X composite waveband.
Background
The anti-interference test training requirement of the existing dual-band radar is high, and in order to simulate a real war scene, a target drone is mostly adopted to carry interference equipment to construct an anti-interference test scene. The prior method comprises the following steps: (1) And (3) constructing a test scene by using a target drone to carry two sets of independent interference equipment. (2) And respectively building one interference device by using the two target drone to construct a test scene. (3) One target drone is used for carrying one interference device, but the two frequency bands work in a time-sharing mode completely;
the above method has the following problems: (1) If one target drone is used for carrying two sets of interference equipment, the interference equipment is too large in size and has requirements on the installation space of the target drone, so that the number of the interference equipment adapted to the target drone is less, and the two sets of interference equipment are difficult to install in the conventional target drone on the market; (2) Two interference devices are carried on one target drone, and harmonic waves of the C-band interference devices can interfere with the X-band interference devices; (3) If two target drone machines carry one interference device respectively, the cost is high, some interference scenes cannot be realized, and if the relative distance between the two target drone machines is not long enough, the C wave band possibly interferes X; (4) When the two frequency bands work in a complete time-sharing mode, the interference efficiency is too low, and collision can be only avoided by probability.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an interference method of a C + X composite wave band aiming at the defects of the prior art, and solves the problem that harmonic waves can cause interference on the X wave band when the C wave band works, so that the interference efficiency of interference equipment is improved.
Meanwhile, the invention also discloses interference equipment of the C + X composite wave band for solving the problems.
The first technical scheme provided by the invention is as follows: an interference method of a C + X composite wave band is carried out according to the following steps:
s1, a signal receiving module receives an X-band signal and a C-band signal, after down-conversion processing, two paths of intermediate-frequency signals are combined and sent to a signal processing module through an intermediate-frequency combiner, and a step S2 is executed, wherein TTL detection signals of two frequency bands are synchronously and respectively output to a main control module;
s2, an AD processor of the signal processing module receives the intermediate-frequency combined signal, after parameter measurement is carried out through a digital receiver, source judgment of signals of a C wave band and an X wave band is carried out, PDW data and a flag bit are generated, and the PDW data and the flag bit are sent to a main control module;
s3, the main control module receives the TTL detection signals of the two frequency bands sent in the step S1 and the PDW data and the zone bits sent in the step S2, if the TTL detection signals are 1, parameters are set to respectively generate sampling interference wave gates of a C wave band and a X wave band, and the sampling interference wave gates are sent to the signal processing module;
s4, the main control module receives the message signals, performs distinguishing processing through the flag bits in the messages, and sends the processed C-band messages and the processed X-band messages to the signal processing module;
s5, a C-band deception noise signal generating unit and an X-band deception noise generating unit of the signal processing module distinguish mark bits of the received messages, select the messages of corresponding frequency bands to process, and generate a C-band deception noise signal and an X-band deception noise signal which are output to the signal transmitting module through a DA;
and S6, the signal transmitting module performs up-conversion and amplification processing on the deception and noise signals and then transmits the deception and noise signals.
The technical solution is further defined in that the specific step of generating PDW data in step S2 is:
s2.1, receiving 1 intermediate frequency combined signal (with the frequency range of 1.3-2.3 GHz), and converting the signal into a 1-path digital signal with the bit width of 10 bits through the conversion of an ADC module with the sampling rate of 2.4 GHz;
s2.2, performing digital channelization processing of 128 channels on the input high-speed digital signal, and analyzing the signal into 128 paths of low-speed complex digital signals with the transmission rate of 18.75 MHz;
s2.3, carrying out CORDIC amplitude measurement and phase measurement on 128 paths of complex signals to obtain instantaneous amplitude and instantaneous phase of each path of signal, caching instantaneous amplitude and phase of all channels by an amplitude/phase caching module, and carrying out phase difference instantaneous frequency measurement processing according to the instantaneous phase to obtain an instantaneous frequency measured value of the signal;
s2.4, selecting a signal amplitude value to perform self-adaptive threshold-crossing detection to obtain digital envelope information of the signal, then performing narrow pulse elimination and split pulse combination, and selecting data of 8 channels from 128 channels to output;
s2.5, after the data of 8 channels are subjected to false signal elimination and cross-channel combination processing, time domain parameter measurement is carried out, and the measurement of pulse arrival time and pulse width is completed;
and S2.6, coding the measured amplitude value, frequency, pulse arrival time and pulse broadband according to the requirement of an output format to form PDW, and outputting the PDW to a signal processor after buffering.
Further, the digital receiver of the signal processing module judges whether the X-band signal and the C-band signal are in the same channel,
if the two frequency bands are not in the same channel and the front edges of TTL detection signals of the two frequency bands do not arrive at the same time, matching is carried out by adopting digital detection and TTL detection, source judgment of signals of a C wave band and a X wave band is carried out, and PDW data and a zone bit are generated;
if the two band signals are overlapped and the front edges of TTL detection signals of the two frequency bands arrive at the same time, the digital receiver sends the two frequency points to the main control module at the same time, the main control module calculates the two frequency points and sends the two frequency points back to the digital receiver, and a frequency measurement comb spectrum pattern is adopted for interference;
if the signals are in the same channel, the digital receiver sends the central frequency corresponding to the channel to the main control module, and the main control module changes the central frequency to radio frequency by using frequency conversion to generate broadband noise for frequency measurement to interfere.
Further, the method for matching by adopting digital detection and TTL detection comprises the following steps: the TTL detection is delayed and synchronized with the digital detection, and meanwhile, the delay between the TTL detection and the digital detection is ensured to be less than or equal to 100ns; and then, judging which band of the radio frequency corresponds to the intermediate frequency through the TOA relative delay between the digital detection and the TTL detection.
Further, the method for generating the spoofed noise signal in step S5 is:
s5.1, reading intermediate frequency message signals of corresponding frequency bands, and carrying out modulation operations of mixing and delay superposition on the read signals according to modulation requirements issued by the messages to generate deception signals;
s5.2, resolving noise frequency modulation information and pulse modulation information required to be generated through the intermediate frequency message signal, resolving the frequency modulation information into frequency code words, sending the frequency code words to the DDS module, enabling the DDS module to generate corresponding frequency point signals, meanwhile, according to different pulse modulation information, using a counter to generate corresponding pulse modulation signals, and using the pulse modulation signals to control the on-off of the DDS signals, so that the pulse modulation is completed to generate noise signals;
and S5.3, combining the deception and noise signals in a digital domain, and outputting the deception noise signals to a signal transmitting module through a DA.
The second technical scheme provided by the invention is as follows: an interference device of C + X composite wave band comprises a signal receiving module, a main control module, a signal processing module and a signal transmitting module which are sequentially transmitted,
wherein, the main control module sends C wave band sampling matching data and X wave band sampling matching data to the signal processing module, the signal processing module sends PDW data and a flag bit back to the main control module through parameter measurement and signal source judgment, the main control module carries out parameter calculation and other processing on PDW codes to generate C wave band messages and X wave band messages and sends the C wave band messages and the X wave band messages to the signal processing module,
the master control module comprises a level conversion circuit, a PDW resolving module, an interface circuit, a parameter resolving circuit, an AXI register set, a PDW sorting and identifying circuit, an FIFO buffer circuit, a DMA transmission circuit and an ARM controller, wherein the level conversion circuit realizes the level conversion from an external signal level to the PDW resolving module; the PDW resolving module measures radar pulse parameters through video signals and TTL signals to form PDW flow; the interface circuit performs data caching, realizes the conversion function of a clock domain and provides a reset signal at the same time; the parameter resolving circuit realizes message analysis and parameter calculation of a target signal; the AXI register group part realizes the parameter configuration of the ARM controller to the parameter resolving part through an AXI bus; the PDW sorting and identifying circuit realizes parameter filtering and database comparison processing of radar pulse description words and realizes signal sorting; the FIFO buffer part realizes the buffer of data and provides a buffer area for DMA transmission; the DMA transmission circuit realizes high-speed transmission of the data; the ARM controller part realizes the functions of data storage, message data analysis, interface communication and the like;
the signal processing module comprises a PDW data and flag bit processing unit, a C waveband deception noise signal generating unit and an X waveband deception noise generating unit, wherein,
the PDW data and mark bit processing unit comprises a digital receiver, the digital receiver consists of a signal preprocessing module, a PDW measuring module, a synchronous clock driving module and a synchronous control signal generating module, and the signal preprocessing module comprises: the device comprises an ADC module, a digital channelizing module, an instantaneous amplitude and phase measurement module and an amplitude/phase cache module, wherein the ADC module, the digital channelizing module, the instantaneous amplitude and phase measurement module and the amplitude/phase cache module are used for completing data acquisition, channelized reception, instantaneous amplitude and phase measurement and cache functions; the PDW measurement module includes: the device comprises an instantaneous frequency measurement module, a signal detection module, a false rejection and cross-channel merging module, a time domain parameter measurement module, a phase difference measurement module, a PDW coding module, a PDW output module and a PDW cache sending module, and PDW parameter measurement including pulse frequency, amplitude, pulse width, arrival time and the like is completed; and the PDW receiving and outputting module receives the PDW data sent by the PDW cache sending module, and outputs the PDW data after data recombination.
The technical solution is further defined in that the signal receiving module separately receives signals of C-band and X-band and then combines the signals at intermediate frequency, and comprises a C-band receiving antenna, a C-band down-conversion circuit, an X-band receiving antenna, an X-band down-conversion circuit, and an intermediate frequency combining circuit,
after the C-band down-conversion circuit processes the signals received by the C-band receiving antenna, the IFC signals are transmitted to the intermediate-frequency combining circuit, meanwhile, C-band TTL detection signals are sent to the main control module, the X-band receiving antenna is an antenna with low-frequency gain, and the received X-band signals are transmitted to the X-band down-conversion circuit; after the processing of the X-band down-conversion circuit, the IFX signal is transmitted to the intermediate frequency combiner circuit, and meanwhile, an X-band TTL detection signal is sent to the main control module; and the intermediate frequency combining circuit combines the IFC signal and the IFX signal and transmits the combined signal to the signal processing module.
Furthermore, the signal processing module is provided with two FPGA chips, and each FPGA is mounted with one QDR chip and used for generating a deception signal; the FPGA # A is mounted with a high-speed ADC for collecting intermediate frequency signals, and the intermediate frequency signals can be transmitted to the B chip through a GTX between the A chip and the B chip and used for generating deception signals; and meanwhile, the A chip and the B chip are respectively mounted with two DACs for signal playback.
Furthermore, the signal transmitting module comprises a C-band up-conversion circuit, a C-band power amplifier, a C-band filter, a C-band transmitting antenna, an X-band up-conversion circuit, an X-band power amplifier and an X-band transmitting antenna, and the C-band transmitting antenna is an antenna with reduced high-frequency gain.
Has the advantages that: the invention provides an interference method and interference equipment for a C + X composite wave band, wherein sampling matching wave gates of a C frequency band and a X frequency band are independent and do not influence each other; selecting a transmitting antenna of a C frequency band on an antenna to select an antenna with high-frequency gain reduction; the X-band receiving antenna selects an antenna with lower low-frequency gain as much as possible, and a filter with high tolerance power is arranged at the rear end of a C-band power amplifier, so that the problem of interference of C-band operation on the X-band is solved; for the problem of superposition interference of two frequency band signals, digital detection and microwave detection synchronous judgment are adopted for overcoming, and the integration efficiency of composite frequency band interference equipment is solved; the invention solves the problem that harmonic waves can cause interference on an X wave band when a C wave band works from a hardware level, designs a single set of hardware into two sets of interference equipment with independent interference time sequences from the aspect of interference time sequences, thereby improving the interference efficiency of the interference equipment, and designs a software part of the single set of hardware into two sets of interference machines which can be independently controlled by using one set of hardware, thereby reducing the volume and the weight of the interference equipment and enabling the interference equipment to be adapted to target machines with more models.
Drawings
Fig. 1 is a block diagram of the apparatus components of the interfering apparatus in C + X composite band according to the present invention.
Fig. 2 is a flowchart of the operation of the central control module and the signal processing module.
Fig. 3 is a block diagram of the signal processing module.
Fig. 4 is a flow chart of a method of matching using digital detection and TTL detection.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1 exemplary application scenario
As shown in fig. 1, the present embodiment provides an interference device in a C + X composite band, which mainly includes: the device comprises a signal receiving module, a main control module, a signal processing module and a signal transmitting module, wherein signals of the modules are transmitted in sequence.
The signal receiving module receives signals of C wave band and X wave band separately and then carries out intermediate frequency combination, and the signal receiving module comprises a C wave band receiving antenna, a C wave band down-conversion circuit, an X wave band receiving antenna, an X wave band down-conversion circuit and an intermediate frequency combining circuit. And after the C-band down-conversion circuit processes the signals received by the C-band receiving antenna, the IFC signals are transmitted to the intermediate-frequency combining circuit, and meanwhile, C-band TTL detection signals are transmitted to the main control module. The X-band receiving antenna is an antenna with low-frequency gain, transmits received X-band signals to the X-band down-conversion circuit, transmits IFX signals to the intermediate-frequency combining circuit after the X-band down-conversion circuit processes the IFX signals, and simultaneously sends X-band TTL detection signals to the main control module. And the intermediate frequency combining circuit combines the IFC signal and the IFX signal and transmits the combined signal to the signal processing module. The independently designed C-band down-conversion circuit and the X-band down-conversion circuit are combined by the intermediate frequency combining circuit and are sent to the signal processing module, and TTL Detection (DLVA) of two frequency bands is synchronously and respectively output, so that the existence of signals of the two frequency bands is judged.
Fig. 2 is a block diagram of a main control module and a signal processing module provided in the present invention. The main control module sends C-band sampling matching data and X-band sampling matching data to the signal processing module, the signal processing module sends PDW data and the zone bit back to the main control module through parameter measurement and signal source judgment, the main control module carries out parameter calculation and other processing on PDW codes, and C-band messages and X-band messages are generated and sent to the signal processing module.
The main control module comprises a level conversion circuit, a PDW resolving module, an interface circuit, a parameter resolving circuit, an AXI register set, a PDW sorting identification circuit, a FIFO buffer circuit, a DMA transmission circuit and an ARM controller. The level conversion circuit realizes the level conversion from the external signal level to the PDW resolving module; the PDW resolving module measures radar pulse parameters through the video signals and the TTL signals to form PDW flow; the interface circuit performs data caching, realizes the conversion function of a clock domain and provides a reset signal; the parameter resolving circuit realizes message resolution and parameter calculation of the target signal; the AXI register group part realizes the parameter configuration of the ARM controller on the parameter resolving part through an AXI bus; the PDW sorting and identifying circuit realizes parameter filtering and database comparison processing of radar pulse description words and realizes signal sorting; the FIFO buffer part realizes the buffer of data and provides a buffer area for DMA transmission; the DMA transmission circuit realizes high-speed transmission of the data; the ARM controller part realizes the functions of data storage, message data analysis, interface communication and the like.
The signal processing module can rapidly generate typical interference patterns and analog signals according to the detected signals, and has the interference pattern programmable capability. The signal processing module comprises a PDW data and flag bit processing unit, a C waveband deception noise signal generating unit and an X waveband deception noise generating unit, wherein,
the signal processing module is composed of a block diagram as shown in fig. 3, wherein two FPGA chips are provided, and each FPGA is mounted with a QDR chip for generating a spoofing signal; the FPGA # A is mounted with a high-speed ADC for collecting intermediate frequency signals, and the intermediate frequency signals can be transmitted to the B chip through a GTX between the A chip and the B chip and used for generating deception signals; and meanwhile, the A chip and the B chip are respectively mounted with two DACs for signal playback.
The PDW data and mark bit processing unit comprises a digital receiver which consists of a signal preprocessing module, a PDW measuring module, a synchronous clock driving module and a synchronous control signal generating module. Wherein, the signal preprocessing module comprises: the device comprises an ADC module, a digital channelizing module, an instantaneous amplitude and phase measuring module and an amplitude/phase caching module, and the ADC module, the digital channelizing module, the instantaneous amplitude and phase measuring module and the amplitude/phase caching module are used for completing data acquisition, channelized reception, instantaneous amplitude and phase measuring and caching functions. The PDW measurement module comprises: the device comprises an instantaneous frequency measurement module, a signal detection module, a false rejection and cross-channel merging module, a time domain parameter measurement module, a phase difference measurement module, a PDW coding module, a PDW output module and a PDW cache sending module, and PDW parameter measurement including pulse frequency, amplitude, pulse width, arrival time and the like is completed. The PDW receiving and outputting module receives the PDW data sent by the PDW cache sending module, and outputs the PDW data after data recombination.
The signal transmitting module comprises a C wave band up-conversion circuit, a C wave band power amplifier, a C wave band filter, a C wave band transmitting antenna, an X wave band up-conversion circuit, an X wave band power amplifier and an X wave band transmitting antenna, wherein the C wave band transmitting antenna is an antenna with high-frequency gain reduced, the C wave band up-conversion circuit and the X wave band up-conversion circuit are separately designed, meanwhile, the power amplifiers of two wave bands are separately designed and are separately controlled, a high-tolerance power filter is added at a C frequency band power amplifier output port, and the problem of interference on the X frequency band when the C frequency band works is solved.
The interference method for the interference device in the C + X composite band provided by this embodiment is as follows:
s1, a signal receiving module receives an X-band signal and a C-band signal, the signals are subjected to down-conversion processing, two paths of intermediate frequency signals are combined by an intermediate frequency combiner and sent to a signal processing module, and S2 is executed, and TTL detection signals of two frequency bands are synchronously and respectively output to a main control module.
The down-conversion treatment method comprises the following steps: the signals of the X-band (8-9 GHz) and the C-band (5-6 GHz) with the instantaneous width of 1GHz are respectively mixed to the intermediate frequency of 1.3-2.3GHz by multi-stage mixing.
And S2, an AD processor of the signal processing module receives the intermediate-frequency combined signals, performs parameter measurement through a digital receiver, judges the source of C-band and X-band signals, generates PDW data and a flag bit, and sends the PDW data and the flag bit to the main control module.
The specific steps for generating PDW data are as follows:
s2.1, receiving 1 intermediate frequency combined signal (with the frequency range of 1.3-2.3 GHz), and converting the signal into a 1-path digital signal with the bit width of 10 bits through the conversion of an ADC module with the sampling rate of 2.4 GHz.
S2.2, the digital channelizing processing of 128 channels is carried out on the input high-speed digital signals, and the signals are analyzed into 128 paths of low-speed complex digital signals with the transmission rate of 18.75 MHz.
S2.3, CORDIC amplitude measurement and phase measurement are carried out on the 128 paths of complex signals to obtain instantaneous amplitude and instantaneous phase of each path of signal, the amplitude/phase caching module caches the instantaneous amplitude and phase of all channels, and according to the instantaneous phase, phase difference instantaneous frequency measurement processing is adopted to obtain an instantaneous frequency measurement value of the signal.
S2.4, selecting a signal amplitude value to perform self-adaptive threshold-crossing detection to obtain digital envelope information of the signal, then performing narrow pulse elimination and split pulse combination, and selecting data of 8 channels from 128 channels to output.
False narrow pulses and irrelevant narrow pulses caused by transient response are eliminated, and pulses split due to transient response and the like are combined. And finally, selecting output channels, and selecting data of at most 8 channels from the 128 channels to be output to the PDW coding module for processing.
S2.5, after the data of 8 channels are subjected to false signal elimination and cross-channel combination processing, time domain parameter measurement is carried out, and the measurement of pulse arrival time and pulse width is completed.
And eliminating false signals appearing in adjacent channels, and combining the broadband signals to output data across the channels.
And S2.6, coding the measured amplitude value, frequency, pulse arrival time and pulse broadband according to the requirement of an output format to form PDW, and outputting the PDW to a signal processor after buffering.
Because the intermediate frequency is a combined signal of two frequency bands, two frequency band signals may exist in the receiver at the same time, and therefore the intermediate frequency needs to pass through a subsequent judging module, so as to judge which frequency band each signal comes from, give a flag bit, simultaneously upload the PDW data and the flag bit to the main control module, allow the PDW data and the flag bit to be converted to corresponding radio frequencies through corresponding frequency conversion relations, and perform sorting.
And S3, the main control module receives the TTL detection signals of the two frequency bands sent in the step S1 and the PDW data and the zone bit sent in the step S2, and if the TTL detection signals are 1, parameters are set to respectively generate sampling interference wave gates of a C wave band and a X wave band and the sampling interference wave gates are sent to the signal processing module.
The set parameters are that sampling time is set through display control software, and the sampling time is transmitted to a main control module and is converted into a TTL signal with continuous sampling time set to be 1; the sampling interference wave gate can enable sampling of C and X wave bands to be independently controlled, when only C wave band signals exist outside, the C wave band sampling wave gate is arranged high, when X wave band signals exist outside, the X wave band sampling wave gate is arranged high, and when the two wave band signals arrive at the same time, the two wave band sampling wave gates are arranged high at the same time.
And S4, the main control module receives the message signals, distinguishes and processes the message signals through the flag bits in the message, sends the processed C-band message and the processed X-band message to the signal processing module, and transmits the message between the main control module and the signal processing module through an SPI protocol.
S5, a C-band deception noise signal generating unit and an X-band deception noise generating unit of the signal processing module distinguish mark bits of the received messages, select the messages of corresponding frequency bands to process, and generate a C-band deception noise signal and an X-band deception noise signal which are output to the signal transmitting module through a DA;
the generation step of the deception signal is as follows: and reading the intermediate frequency message signals of the corresponding frequency band, and carrying out frequency mixing and delay superposition modulation operation on the read signals according to the modulation requirement issued by the message to generate deception signals.
The noise signal generation step is: the method comprises the steps of solving noise frequency modulation information and pulse modulation information which need to be generated through an intermediate frequency message signal, resolving the frequency modulation information into frequency code words, sending the frequency code words to a DDS module, enabling the DDS module to generate corresponding frequency point signals, meanwhile, generating corresponding pulse modulation signals through a counter according to different pulse modulation information, and controlling the connection and disconnection of the DDS signals through the pulse modulation signals, so that the generation of the noise signals through pulse modulation is completed.
And combining the cheating signal and the noise signal in a digital domain, and outputting the cheating noise signal to a signal transmitting module through a DA.
The method for resolving the message comprises the following steps: the message format is self-defined, and the message consists of: a message header, a message type, a message content, a message tail and an exclusive or check bit; and receiving and resolving the message by judging the message header, the message type, the message tail and the XOR check bit by adopting a state machine.
The FPGA # A and the FPGA # B respectively solve the C frequency band message and the X frequency band message, corresponding parameters are solved through the parameter solving modules of the FPGA # A and the FPGA # B, deception and noise signals are output, the deception and noise signals are combined in a digital domain and output through a DA, the DA mounted on the FPGA # A is controlled by the FPGA # A to output interference signals of the C frequency band, and the DA mounted on the FPGA # B is controlled by the FPGA # B to output interference signals of the X frequency band. Because the flag bit is added in the message, the corresponding chip resolves the message of the corresponding frequency band, and the other FPGA does not respond to the message (FPGA # A-C; FPGA # B-X).
And S6, the signal transmitting module transmits the deception and noise signals after up-conversion and amplification processing.
When in up-conversion, the intermediate frequency 1.3-2.3GHz intermediate frequency signal generated by the signal generating module is converted to the appointed 5-6GHz or 8-9GHz radio frequency signal through frequency mixing, filtering and amplifying.
In addition, the digital receiver of the signal processing module judges whether the X-band signal and the C-band signal are in the same channel.
And if the two frequency bands are not in the same channel and the front edges of the TTL detection signals of the two frequency bands do not arrive at the same time, matching by adopting digital detection and TTL detection, judging the source of the C-band signal and the X-band signal, and generating PDW data and a zone bit. The flow chart of the method for matching by using digital detection and TTL detection is shown in FIG. 4: the TTL detection is delayed and synchronized with the digital detection, and meanwhile, the delay between the TTL detection and the digital detection is ensured to be less than or equal to 100ns, and the delay of the front-stage channelized receiver is basically fixed, the system clock is 150M, the period is 6.667ns, and the delay can be basically ensured to be less than or equal to 100ns. And then, judging which band of the radio frequency corresponds to the intermediate frequency through the TOA relative delay between the digital detection and the TTL detection.
If the two band signals are overlapped and the front edges of TTL detection signals of the two frequency bands arrive at the same time, the digital receiver sends the measured two frequency points to the main control module at the same time, the main control module sends the two frequency points back to the digital receiver after resolving the two frequency points, and the frequency measurement comb spectrum pattern is adopted for interference.
If the signals are in the same channel, the digital receiver sends the central frequency corresponding to the channel to the main control module, and the main control module changes the central frequency to radio frequency by using frequency conversion to generate broadband noise for frequency measurement to interfere.
In the method, the step of judging whether the leading edges of the TTL detection signals of the two frequency bands arrive at the same time or not is as follows:
(1) Firstly, determining the time measurement accuracy of the system: because the measurement of the pulse repetition period is mainly obtained by using the pulse arrival Time (TOA) as a difference value, the time measurement precision is the measurement precision of the pulse repetition period. The errors in the pulse repetition period measurement mainly include jitter in the detection of the leading edge of the pulse and measurement errors introduced by the clock accuracy. When the repetition period is small, the accumulated error due to the clock accuracy is negligible. The pulse repetition period is equal to the difference in pulse arrival times of adjacent pulses, which is theoretically close to 0 given the high correlation between the rising edges of the pulses. The following table shows the results of 1000 monte carlo simulations by matlab, wherein the simulation is performed on the pulses with the pulse widths of 100ns and 500ns respectively under the conditions that the signal-to-noise ratio is 4dB and the repetition period is 2us at different frequency points (the intermediate frequency band adopted by the system is 1.3 GHz-2.3 GHz), and the simulation results of the pulse repetition period measurement accuracy (RMS) are shown in the following table.
TABLE 4.1 simulation results of pulse repetition period measurement accuracy
According to the simulation result, when the repetition period is smaller, the measurement precision of the pulse repetition period is less than or equal to 0.1us, and the index requirement is met.
When the pulse repetition period is 100,000us, the accumulated error introduced by the clock precision needs to be considered, and the clock precision of the system is about 10 -7 The error introduced by the clock precision is about 10ns, and the error is comprehensively less than or equal to 0.1u in combination with the error of the front edge jitterAnd s, meeting the index requirement.
(2) Judging whether the pulses arrive at the same time: the accuracy is less than or equal to 100ns under different conditions, so the criterion of whether the C-band signal and the X-band signal arrive at the same time is 100ns +/-sigma, and according to the empirical value, the system clock is 150M, so the sigma is 20ns, and when the digital detection delay of the two signals is less than or equal to 100ns +/-sigma, the two band signals are judged to arrive at the same time.
The method aims to solve the problem that signals of two frequency bands are down-converted to 1.3-2.3GHz and exist in one channel after passing through a channelized receiver, and PDW information of the signals cannot be obtained through measurement at the moment, so that the central frequency of the channel is uploaded, and an interference machine generates frequency measurement broadband noise to deal with the frequency measurement broadband noise (the noise bandwidth is the channel width), so that interference on radar signals of C, X is guaranteed.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The interference method of the C + X composite wave band is characterized by comprising the following steps:
s1, a signal receiving module receives an X-band signal and a C-band signal, after down-conversion processing, two paths of intermediate-frequency signals are combined and sent to a signal processing module through an intermediate-frequency combiner, and a step S2 is executed, wherein TTL detection signals of two frequency bands are synchronously and respectively output to a main control module;
s2, an AD processor of the signal processing module receives the intermediate-frequency combined signals, after parameter measurement is carried out through a digital receiver, source judgment is carried out on C-band and X-band signals, PDW data and a flag bit are generated, and the PDW data and the flag bit are sent to a main control module;
s3, the main control module receives the TTL detection signals of the two frequency bands sent in the step S1 and the PDW data and the zone bits sent in the step S2, if the TTL detection signals are 1, parameters are set to respectively generate sampling interference wave gates of a C wave band and a X wave band, and the sampling interference wave gates are sent to the signal processing module;
s4, the main control module receives the message signals, performs distinguishing processing through flag bits in the messages, and sends the processed C-band messages and the processed X-band messages to the signal processing module;
s5, a C-band deception noise signal generating unit and an X-band deception noise generating unit of the signal processing module distinguish flag bits of received messages, select messages of corresponding frequency bands to be processed, and generate C-band deception noise signals and X-band deception noise signals which are output to the signal transmitting module through DA;
and S6, the signal transmitting module performs up-conversion and amplification processing on the deception and noise signals and then transmits the deception and noise signals.
2. The interference method for C + X composite bands according to claim 1, wherein the step S2 of generating PDW data specifically comprises:
s2.1, receiving 1 intermediate frequency combined signal (with the frequency range of 1.3 to 2.3 GHz), and converting the signal into a 1-path digital signal with the bit width of 10 bits through the conversion of an ADC (analog to digital converter) module with the sampling rate of 2.4 GHz;
s2.2, performing digital channelization processing of 128 channels on the input high-speed digital signal, and analyzing the signal into 128 paths of low-speed complex digital signals with the transmission rate of 18.75 MHz;
s2.3, carrying out CORDIC amplitude measurement and phase measurement on 128 paths of complex signals to obtain instantaneous amplitude and instantaneous phase of each path of signal, caching instantaneous amplitude and phase of all channels by an amplitude/phase caching module, and carrying out phase difference instantaneous frequency measurement processing according to the instantaneous phase to obtain an instantaneous frequency measurement value of the signal;
s2.4, selecting a signal amplitude value to perform self-adaptive threshold-crossing detection to obtain digital envelope information of the signal, then performing narrow pulse elimination and split pulse combination, and selecting data of 8 channels from 128 channels to output;
s2.5, after the data of 8 channels are subjected to false signal elimination and cross-channel combination processing, time domain parameter measurement is carried out, and the measurement of pulse arrival time and pulse width is completed;
and S2.6, coding the measured amplitude value, frequency, pulse arrival time and pulse broadband according to the requirement of an output format to form PDW, and outputting the PDW to a signal processor after buffering.
3. The C + X composite band interference method of claim 1, wherein the digital receiver of the signal processing module determines whether the X band signal and the C band signal are in the same channel,
if the two frequency bands are not in the same channel and the front edges of TTL detection signals of the two frequency bands do not arrive at the same time, matching is carried out by adopting digital detection and TTL detection, source judgment of signals of a C wave band and an X wave band is carried out, and PDW data and a zone bit are generated;
if the two band signals are overlapped and the front edges of TTL detection signals of the two frequency bands arrive at the same time, the digital receiver sends the two frequency points to the main control module at the same time, the main control module calculates the two frequency points and sends the two frequency points back to the digital receiver, and a frequency measurement comb spectrum pattern is adopted for interference;
if the signals are in the same channel, the digital receiver sends the central frequency corresponding to the channel to the main control module, and the main control module changes the central frequency to radio frequency by using frequency conversion to generate broadband noise for frequency measurement to interfere.
4. The C + X complex band jammer method of claim 3, wherein the matching method using digital detection and TTL detection comprises: the TTL detection is delayed and synchronized with the digital detection, and meanwhile, the delay between the TTL detection and the digital detection is ensured to be less than or equal to 100ns; and then, judging which band of the radio frequency corresponds to the intermediate frequency through the TOA relative time delay between the digital detection and the TTL detection.
5. The interference method of claim 3, wherein the method for determining whether the leading edges of the TTL detection signals of two frequency bands arrive at the same time comprises:
(1) Firstly, determining the time measurement precision of the system to be less than or equal to 100ns;
(2) When two signalsDigital detection delay is less than or equal to
When the temperature of the water is higher than the set temperature,
if the time is determined to be 20ns, the signals of the two wave bands arrive at the same time.
6. The interference method of the C + X composite band according to claim 1, wherein the generation method of the spoofed noise signal in step S5 is:
s5.1, reading intermediate frequency message signals of corresponding frequency bands, and carrying out modulation operations of mixing and delay superposition on the read signals according to modulation requirements issued by the messages to generate deception signals;
s5.2, resolving noise frequency modulation information and pulse modulation information required to be generated through the intermediate frequency message signal, resolving the frequency modulation information into frequency code words, sending the frequency code words to the DDS module, enabling the DDS module to generate corresponding frequency point signals, meanwhile, according to different pulse modulation information, using a counter to generate corresponding pulse modulation signals, and using the pulse modulation signals to control the on-off of the DDS signals, so that the pulse modulation is completed to generate noise signals;
and S5.3, combining the deception and noise signals in a digital domain, and outputting the deception noise signals to a signal transmitting module through a DA.
7. The jamming device of the C + X composite band jamming method according to any of claims 1~6, comprising a signal receiving module, a main control module, a signal processing module and a signal transmitting module for sequentially transmitting signals,
wherein, the main control module sends C wave band sampling matching data and X wave band sampling matching data to the signal processing module, the signal processing module sends PDW data and a flag bit back to the main control module through parameter measurement and signal source judgment, the main control module carries out parameter calculation and other processing on PDW codes to generate C wave band messages and X wave band messages which are sent to the signal processing module,
the master control module comprises a level conversion circuit, a PDW resolving module, an interface circuit, a parameter resolving circuit, an AXI register set, a PDW sorting and identifying circuit, an FIFO buffer circuit, a DMA transmission circuit and an ARM controller, wherein the level conversion circuit realizes the level conversion from an external signal level to the PDW resolving module; the PDW resolving module measures radar pulse parameters through video signals and TTL signals to form PDW flow; the interface circuit performs data caching, realizes the conversion function of a clock domain and provides a reset signal at the same time; the parameter resolving circuit realizes message analysis and parameter calculation of a target signal; the AXI register group part realizes the parameter configuration of the ARM controller to the parameter resolving part through an AXI bus; the PDW sorting and identifying circuit realizes parameter filtering and database comparison processing of radar pulse description words and realizes signal sorting; the FIFO buffer part realizes the buffer of data and provides a buffer area for DMA transmission; the DMA transmission circuit realizes high-speed transmission of the data; the ARM controller part realizes the functions of data storage, message data analysis, interface communication and the like;
the signal processing module comprises a PDW data and flag bit processing unit, a C waveband deception noise signal generating unit and an X waveband deception noise generating unit, wherein,
the PDW data and mark bit processing unit comprises a digital receiver, the digital receiver consists of a signal preprocessing module, a PDW measuring module, a synchronous clock driving module and a synchronous control signal generating module, and the signal preprocessing module comprises: the device comprises an ADC module, a digital channelizing module, an instantaneous amplitude and phase measurement module and an amplitude/phase cache module, wherein the ADC module, the digital channelizing module, the instantaneous amplitude and phase measurement module and the amplitude/phase cache module are used for completing data acquisition, channelized reception, instantaneous amplitude and phase measurement and cache functions; the PDW measurement module includes: the device comprises an instantaneous frequency measurement module, a signal detection module, a false rejection and cross-channel merging module, a time domain parameter measurement module, a phase difference measurement module, a PDW coding module, a PDW output module and a PDW cache sending module, and PDW parameter measurement including pulse frequency, amplitude, pulse width, arrival time and the like is completed; and the PDW receiving and outputting module receives the PDW data sent by the PDW cache sending module, and outputs the PDW data after data recombination.
8. The C + X composite band jammer device of claim 7, wherein the signal receiving module receives the signals of C band and X band separately and then combines the signals of C band and X band, and comprises a C band receiving antenna, a C band down-conversion circuit, an X band receiving antenna, an X band down-conversion circuit and an intermediate frequency combining circuit,
after the C-band down-conversion circuit processes the signals received by the C-band receiving antenna, the IFC signals are transmitted to the intermediate-frequency combining circuit, meanwhile, C-band TTL detection signals are sent to the main control module, the X-band receiving antenna is an antenna with low-frequency gain, and the received X-band signals are transmitted to the X-band down-conversion circuit; after the processing of the X-band down-conversion circuit, the IFX signal is transmitted to the intermediate frequency combiner circuit, and meanwhile, an X-band TTL detection signal is sent to the main control module; and the intermediate frequency combining circuit combines the IFC signal and the IFX signal and transmits the combined signal to the signal processing module.
9. The C + X composite waveband jamming device according to claim 7, wherein the signal processing module has two FPGA chips, and each FPGA chip mounts one QDR chip for generating a spoof signal; the FPGA # A is used for mounting a high-speed ADC for collecting intermediate-frequency signals, and the intermediate-frequency signals can be transmitted to the B chip through a GTX between the A chip and the B chip and are used for generating deception signals; and meanwhile, the A chip and the B chip are respectively mounted with two DACs for signal playback.
10. The jamming device according to claim 7, wherein the signal transmitting module comprises a C-band up-converter circuit, a C-band power amplifier, a C-band filter, a C-band transmitting antenna, an X-band up-converter circuit, an X-band power amplifier, and an X-band transmitting antenna, and the C-band transmitting antenna is an antenna with reduced high-frequency gain.
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