CN116699529A - Low-storage-resource-consumption full-pulse storage DRFM method and system - Google Patents
Low-storage-resource-consumption full-pulse storage DRFM method and system Download PDFInfo
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/2806—Employing storage or delay devices which preserve the pulse form of the echo signal, e.g. for comparing and combining echoes received during different periods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/38—Jamming means, e.g. producing false echoes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/76—Architectures of general purpose stored program computers
- G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
- G06F15/7807—System on chip, i.e. computer system on a single chip; System in package, i.e. computer system on one or more chips in a single package
- G06F15/781—On-chip cache; Off-chip memory
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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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
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention relates to the technical field of radio frequency digital signal processing, in particular to a full pulse storage DRFM method and system with low storage resource consumption, which are characterized in that frequency points of input digital signals are obtained through real-time calculation, corresponding down-conversion/extraction module local oscillation frequencies are matched according to actually measured frequency points, and the same interpolation/up-conversion module local oscillation frequencies can be selected during playback, so that on one hand, the space size requirement for IQ two-path zero intermediate frequency low-sampling signal storage is reduced, the storage requirement of an FPGA is reduced, and the cost is reduced; on the other hand, the processing of the large-bandwidth signal can be met, and the actual use requirement is met.
Description
Technical Field
The invention relates to the technical field of radio frequency digital signal processing, in particular to a low-memory-resource-consumption full-pulse memory DRFM method and system.
Background
With the continuous development of modern radar technology, radar anti-interference capability is stronger and stronger. Therefore, in recent years, the radar interference technology based on digital frequency storage technology (DRFM) has been rapidly developed, and the radar interference technology can record and store radar signal waveforms accurately and completely for a long time under certain conditions, and when interference is needed, the radar interference technology can convert the radar signal into various smart deception interference according to overall requirements by copying the required radar signals, and can implement optimal interference patterns on different radars in terms of distance, azimuth and speed. The radar interference equipment based on digital frequency storage adopts high-speed digital circuit technology such as digital frequency storage technology and direct digital frequency synthesis technology, and is combined with comprehensive processing technology, so that the radar interference equipment becomes a main interference technology for dealing with modern radars.
The document 'channelized design of an instantaneous large-bandwidth DRFM system' introduces a channelized DRFM implementation technology, which can convert a high-speed signal into a low-speed signal of a plurality of channels, and is convenient for FPGA implementation. However, the existing DRFM system does not solve the problem of insufficient storage space caused by large bandwidth of signals, and because the down-conversion is performed in an analog mode, a series of interference problems such as signal spurious interference, image interference, intermodulation interference and the like are necessarily caused in the analog processing mode of signals, if the center frequency of the signals is too high, the use requirement of storage resources is increased, the cost is increased, and the traditional DRFM system adopts a fixed NCO structure, the instantaneous bandwidth of the traditional DRFM system is mainly determined by the sampling rate of an a/D converter, the provided local oscillation frequency is fixed, and the application scene of fixed frequency point is applicable, so that the actual use requirement cannot be met.
Disclosure of Invention
The invention aims to provide a full pulse storage DRFM method and system with low storage resource consumption, which solve the problem that the current signal large-bandwidth long-time storage occupies a large amount of storage resources.
The invention solves the technical problems as follows:
the full pulse storage DRFM method with low storage resource consumption is characterized by comprising the following steps:
s1, converting an input analog signal into a digital signal through an AD converter, wherein the digital signal is used as a frequency measurement digital signal and an input digital signal respectively;
s2, calculating the position of a central frequency point of the frequency-measuring digital signal, analyzing according to the position of the central frequency point of the frequency-measuring digital signal to obtain a frequency band of the central frequency point of the frequency-measuring digital signal, matching a corresponding input frequency band number according to the current frequency band, and storing the input frequency band number to be used as a playback frequency band number during playback;
s3, selecting the local oscillation frequency of the down-conversion/extraction module according to the input frequency band number obtained in the step S2;
s4, setting signal delay time according to the calculation time of the frequency band where the center frequency point of the frequency measurement digital signal is located in the step S2, performing down-conversion/extraction operation on the input digital signal according to the signal delay time and the local oscillation frequency of the down-conversion/extraction module to obtain and store two paths of zero intermediate frequency low sampling signals of the input IQ, and using the two paths of zero intermediate frequency low sampling signals as playback IQ during playback;
s5, reading the stored playback IQ two-path zero intermediate frequency low sampling signals and performing interference pattern signal processing to obtain the IQ two-path zero intermediate frequency low sampling signals added with the interference patterns; reading a playback frequency band number corresponding to the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns, and selecting the local oscillation frequency of the interpolation/up-conversion module according to the playback frequency band number;
s6, carrying out interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain an output digital signal with the same frequency band as the input analog signal;
s7, converting the output digital signal into an output analog signal through DA.
Further defined, said step S2 comprises the steps of:
s21, continuously acquiring n points of the frequency measurement digital signal, calculating the positions of the center frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the center frequency points of the n points to obtain the frequency band of the center frequency point of the frequency measurement digital signal;
s22, matching the corresponding input frequency band number according to the current frequency band;
s23, storing the input band number obtained in step S22, and using the stored input band number as a playback band number.
Further defined, said step S3 comprises the steps of:
s31, an NCO local oscillation array is established, wherein the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
s32, selecting a local oscillation frequency point corresponding to the input frequency band number as the down-conversion/extraction local oscillation frequency according to the input frequency band number obtained in the step S2.
Further defined, said step S4 comprises the steps of:
s41, calculating the time setting signal delay time of the frequency band according to the step S21;
s42, after the input digital signal is delayed according to the signal delay time, performing down-conversion/extraction operation with the local oscillation frequency of the corresponding down-conversion/extraction module to obtain two paths of zero intermediate frequency low sampling signals of the input IQ;
s43, storing the two paths of zero intermediate frequency low sampling signals of the input IQ as the two paths of zero intermediate frequency low sampling signals of the playback IQ during playback, and enabling the playback frequency band numbers to correspond to the two paths of zero intermediate frequency low sampling signals of the playback IQ one by one.
Further defined, said step S5 comprises the steps of:
s51, reading playback IQ two paths of zero intermediate frequency low sampling signals from a memory, and reading playback band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the memory according to the playback IQ two paths of zero intermediate frequency low sampling signals;
s52, according to interference requirements, performing interference pattern signal processing operation on the playback IQ two-path zero intermediate frequency low sampling signals read in the step S51 to obtain IQ two-path zero intermediate frequency low sampling signals added with interference patterns;
s53, selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number read in the step S51.
A low storage resource consumption full pulse storage DRFM system, comprising:
a high-speed AD conversion unit for converting an input analog signal into digital signals, which are used as a frequency-measurement digital signal and an input digital signal, respectively;
the frequency measurement unit is used for receiving and calculating the position of the central frequency point of the frequency measurement digital signal, analyzing the frequency band of the central frequency point of the frequency measurement digital signal according to the position of the central frequency point of the frequency measurement digital signal, and transmitting the obtained frequency band to the control unit;
the delay unit is used for setting signal delay time according to the frequency band calculation time of the frequency measurement unit, receiving an input digital signal, and transmitting the input digital signal to the down-conversion/extraction unit after the signal delay time delay;
the control unit is used for receiving the frequency band sent by the frequency measurement unit, matching the input frequency band number corresponding to the current frequency band and respectively sending the obtained input frequency band number to the NCO local oscillator array unit and the storage unit;
the NCO local oscillator array unit is used for receiving the input frequency band number, selecting the local oscillator frequency of the down-conversion/extraction unit according to the input frequency band number, and providing the selected local oscillator frequency of the down-conversion/extraction unit for the down-conversion/extraction unit;
the down-conversion/extraction unit is used for receiving the local oscillation frequency of the down-conversion/extraction unit and the input digital signal, performing down-conversion/extraction operation on the input digital signal and the local oscillation frequency of the down-conversion/extraction unit to obtain IQ two paths of zero intermediate frequency low sampling signals, and sending the IQ two paths of zero intermediate frequency low sampling signals to the storage unit;
a storage unit for receiving and storing an input band number, the input band number being used as a playback band number at the time of playback; receiving and storing IQ two paths of zero intermediate frequency low sampling signals as playback IQ two paths of zero intermediate frequency low sampling signals for use in playback, wherein playback frequency band numbers are in one-to-one correspondence with the playback IQ two paths of zero intermediate frequency low sampling signals;
the control unit is also used for sending the playback IQ two paths of zero intermediate frequency low sampling signals in the storage unit to the signal processing unit, reading the playback frequency band number corresponding to the playback frequency band number in the storage unit, and sending the playback frequency band number to the NCO local oscillator array unit;
the NCO local oscillator array unit is also used for receiving the playback frequency band number, selecting interpolation/up-conversion local oscillator frequency according to the playback frequency point, and sending the interpolation/up-conversion local oscillator frequency to the interpolation/up-conversion unit;
the signal processing unit is used for receiving and replaying the IQ two-way zero intermediate frequency low sampling signals, performing interference pattern signal processing on the IQ two-way zero intermediate frequency low sampling signals to obtain the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns, and sending the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns to the interpolation/up-conversion unit;
the interpolation/up-conversion unit is used for receiving interpolation/up-conversion local oscillation frequency and IQ two paths of zero intermediate frequency low sampling signals added with interference patterns, and performing interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain output digital signals with the same frequency band as the input analog signals;
and the high-speed DA conversion unit is used for converting the output digital signal into an output analog signal.
Further defined, the frequency measurement unit includes:
the sampling module is used for continuously acquiring n points of the frequency measurement digital signal;
the frequency band calculation module is used for calculating the positions of the central frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the central frequency points of the n points to obtain the frequency band of the central frequency point of the frequency measurement digital signal;
and the frequency band sending module is used for sending the frequency band obtained by the frequency band calculating module to the control unit.
Further defined, the control unit includes:
the input frequency point analysis module is used for receiving the frequency band sent by the frequency band sending module and determining an input frequency band number corresponding to the current frequency band;
the input frequency band sending module is used for respectively sending the obtained input frequency band numbers to the NCO local oscillator array unit and the storage unit;
the playback signal transmitting module is used for controlling the storage unit to transmit playback IQ two paths of zero intermediate frequency low sampling signals to the signal processing unit;
the playback frequency point acquisition module is used for acquiring playback frequency band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the storage unit;
and the playback frequency band sending module is used for sending the acquired playback frequency band number to the NCO local oscillator array unit.
Further defined, the NCO local oscillator array unit includes:
the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
the input frequency point matching module is used for receiving an input frequency band number and selecting a local oscillation frequency point corresponding to the input frequency band number as a down-conversion/extraction local oscillation frequency according to the input frequency band number;
and the playback frequency point matching module is used for receiving the playback frequency band number and selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number.
Further defined, the memory cell includes:
the signal storage module is used for receiving the IQ two-path zero intermediate frequency low sampling signals, storing the IQ two-path zero intermediate frequency low sampling signals as playback IQ two-path zero intermediate frequency low sampling signals during playback, and sending the playback IQ two-path zero intermediate frequency low sampling signals to the signal processing unit;
and the frequency point storage module is used for receiving the input frequency band number and storing the input frequency band number to obtain the playback frequency band number.
The invention has the beneficial effects that:
1. according to the invention, the frequency points of the input digital signals are obtained through real-time calculation, the corresponding down-conversion/extraction module local oscillation frequency is matched according to the actually measured frequency points, and the same interpolation/up-conversion module local oscillation frequency can be selected during playback, so that on one hand, the space size requirement for IQ two-way zero intermediate frequency low sampling signal storage is reduced, the storage requirement of an FPGA is reduced, and the cost is reduced; on the other hand, the processing of the large-bandwidth signal can be met, and the actual use requirement is met.
2. The invention reduces the data rate by utilizing the local oscillation frequency of the down-conversion/extraction module so as to realize long delay; meanwhile, corresponding delay is carried out on the input digital signal according to the frequency measurement calculation time, so that the influence caused by the frequency measurement delay is counteracted, and more accurate frequency tracking is ensured; the sampling frequency band numbers and the IQ two paths of zero intermediate frequency low sampling signals are stored in a one-to-one correspondence manner, so that each small section of signal can have corresponding frequency point information, and signal playback is realized accurately; the full-digital signal processing mode can be applied to a software radio platform, has high flexibility and wider application range.
Drawings
FIG. 1 is a step diagram of a low memory resource consumption full pulse memory DRFM method of the present invention;
FIG. 2 is a block diagram of a low storage resource consumption full pulse storage DRFM system of the present invention;
FIG. 3 is a block diagram of a low storage resource consumption full pulse storage DRFM system according to the present invention.
Detailed Description
Example 1
Referring to fig. 1, the present embodiment provides a low storage resource consumption full pulse storage DRFM method, including the steps of:
s1, converting an input analog signal into a digital signal through an AD converter, wherein the digital signal is used as a frequency measurement digital signal and an input digital signal respectively;
specifically, for example, the intermediate frequency of the input signal is selected to be 600MHz, the sampling rate of the DRFM is selected to be 800MHz according to the bandpass sampling theorem, and at this time, the instantaneous bandwidth of the DRFM is 320MHz, that is, the actual input signal frequency is 440 MHz-760 MHz, the sampling precision is 16 bits, and the maximum delay is 10ms.
The input analog signals are required to be converted into digital signals through an AD converter, an AD9680 chip of an AD company is selected by a high-speed AD sampling chip, and a Xilinx Kintex UltraScale KU060 FPGA is selected by an FPGA chip.
The input analog signal is converted into a digital signal by an AD converter, and the digital signal is required to be subjected to instantaneous frequency measurement in a subsequent step and is required to be delayed and transmitted in the subsequent step, so that the digital signal subjected to instantaneous frequency measurement in the subsequent step is used as a frequency measurement digital signal, and the digital signal required to be transmitted after delay is used as the input digital signal.
S2, calculating the position of a central frequency point of the frequency-measuring digital signal, analyzing according to the position of the central frequency point of the frequency-measuring digital signal to obtain a frequency band of the central frequency point of the frequency-measuring digital signal, matching a corresponding input frequency band number according to the current frequency band, and storing the input frequency band number to be used as a playback frequency band number during playback;
s3, selecting the local oscillation frequency of the down-conversion/extraction module according to the input frequency band number obtained in the step S2;
s4, setting signal delay time according to the calculation time of the frequency band where the center frequency point of the frequency measurement digital signal is located in the step S2, performing down-conversion/extraction operation on the input digital signal according to the signal delay time and the local oscillation frequency of the down-conversion/extraction module to obtain and store two paths of zero intermediate frequency low sampling signals of the input IQ, and using the two paths of zero intermediate frequency low sampling signals as playback IQ during playback;
s5, reading the stored playback IQ two-path zero intermediate frequency low sampling signals and performing interference pattern signal processing to obtain the IQ two-path zero intermediate frequency low sampling signals added with the interference patterns; reading a playback frequency band number corresponding to the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns, and selecting the local oscillation frequency of the interpolation/up-conversion module according to the playback frequency band number;
s6, carrying out interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain an output digital signal with the same frequency band as the input analog signal;
specifically, the IQ two paths of zero intermediate frequency low sampling signals added with the interference pattern and the local oscillation frequency of the interpolation/up-conversion module are subjected to interpolation/up-conversion operation to obtain an output digital signal with the same frequency band as the input analog signal, namely, the reverse operation is performed for 8 times playback to obtain the output digital signal.
S7, converting the output digital signal into an output analog signal through DA.
Further illustratively, step S2 includes the steps of:
s21, continuously acquiring n points of the frequency measurement digital signal, calculating the positions of the center frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the center frequency points of the n points to obtain the frequency band of the center frequency point of the frequency measurement digital signal;
s22, matching the corresponding input frequency band number according to the current frequency band;
s23, storing the input band number obtained in step S22, and using the stored input band number as a playback band number.
Specifically, assuming that at the present moment, the frequency point of the input signal is 722MHz, that is, the center frequency point is 722MHz, the signal is sampled by using the sampling frequency of 800MHz, and the frequency in the first nyquist interval is 122MHz according to the bandpass sampling theorem.
At the moment, after 64 points are continuously acquired on the frequency measurement digital signal, the center frequency point of the 64 points is calculated to be 122MHz through a rapid frequency measurement algorithm, wherein the rapid frequency measurement algorithm can be selected from a waveform fitting method, a waveform pushing algorithm, a Fourier transform method or a digital phase discrimination method, and different digital instantaneous frequency measurement modes can be flexibly selected according to the requirements of system frequency measurement precision, calculation complexity and system complexity.
According to the current frequency point, a frequency band corresponding to the frequency point can be determined, for example, for an input analog signal with the frequency range of 440-760 MHz, band-pass sampling is carried out by an AD (analog-digital) device with the frequency range of-160 MHz, the frequency range is divided into A (A=15) continuously overlapped frequency bands, namely-160-120 MHz, -140-100 MHz, -120-80 MHz, -100-60 MHz, -80-40 MHz, -60-20 MHz, -40-0 MHz, -20MHz, 00-40 MHz, 20-60 MHz, 40-80 MHz, 60-100 MHz, 80-120 MHz, 100-140 MHz and 120-160 MHz, and each frequency band corresponds to one input frequency band number, namely-7 frequency bands; determining an input frequency band number corresponding to the frequency point of the current frequency measurement digital signal according to the frequency band range, at the moment, calculating to obtain the frequency point of the current frequency measurement digital signal as 122MHz, storing the corresponding input frequency band number as frequency band 6, and taking the stored input frequency band number as a playback frequency band number for use in signal playback, wherein the playback frequency band number is identical with the input frequency point number; if the calculated frequency point is 12MHz, the 12MHz is close to the right end point of the-20 MHz frequency band, so that the corresponding frequency band number is frequency band 0, and if the calculated frequency point is 10MHz, the corresponding frequency band number is downwards selected to be frequency band 0.
The instantaneous frequency measurement is only carried out by coarse frequency measurement, and the frequency measurement resolution is matched with the frequency bandwidth, so that the faster frequency measurement and the larger system bandwidth are realized.
Further illustratively, step S3 includes the steps of:
s31, an NCO local oscillation array is established, wherein the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
s32, selecting a local oscillation frequency point corresponding to the input frequency band number as the down-conversion/extraction local oscillation frequency according to the input frequency band number obtained in the step S2.
Specifically, an NCO local oscillator array is established by using a CORDIC algorithm according to the frequency range of the digital signal, the NCO local oscillator array comprises a (a=15) NCO with equal frequency intervals, the number of the NCO is the same as the number of the frequency bands, each NCO generates a local oscillator frequency point, the frequency points generated by 15 NCO correspond to the 15 input frequency band numbers one by one, and the local oscillator frequency point generated by each NCO is the center frequency point of the frequency band corresponding to the input frequency point number. In this embodiment, the obtained local oscillation frequency of 120MHz is used as the down-conversion/extraction local oscillation frequency.
Array NCO is realized by using a CORDIC algorithm, and precious storage resources in the FPGA are saved under the condition of ensuring the same frequency difference and the same jitter of signals.
Step S4 comprises the steps of:
s41, calculating the time setting signal delay time of the frequency band according to the step S21;
s42, after the input digital signal is delayed according to the signal delay time, performing down-conversion/extraction operation with the local oscillation frequency of the corresponding down-conversion/extraction module to obtain two paths of zero intermediate frequency low sampling signals of the input IQ;
s43, storing the two paths of zero intermediate frequency low sampling signals of the input IQ as the two paths of zero intermediate frequency low sampling signals of the playback IQ during playback, and enabling the playback frequency band numbers to correspond to the two paths of zero intermediate frequency low sampling signals of the playback IQ one by one.
Specifically, the signal delay time is determined according to the frequency point calculation time T of the frequency measurement digital signal center frequency point, where the frequency point calculation time T of the frequency measurement digital signal center frequency point includes time t1=64/800=80 ns for collecting n=64 frequency points of the frequency measurement digital signal center frequency point, and time t2=400 ns for calculating n=64 frequency point center frequency points, so that the time taken is 480ns, and the time is rounded when the frequency measurement digital signal center frequency point calculation time T is usually used, i.e. t=500 ns.
The method comprises the steps that a down-conversion/extraction module local oscillation frequency is obtained after a frequency measurement digital signal which is input simultaneously with an input digital signal is subjected to about 500ns processing, the input digital signal is subjected to down-conversion/extraction operation with the down-conversion/extraction module local oscillation frequency which is also obtained after being subjected to 500ns processing after being delayed by 500ns, and two paths of zero intermediate frequency low sampling signals of an input IQ are obtained and stored;
at this moment, the 120MHz local oscillation frequency and the input digital signal are subjected to down-conversion/decimation operation to obtain two paths of zero intermediate frequency low sampling signals of the input IQ with the sampling rate of 50 MHz: the method comprises the steps of extracting an input digital signal by 8 times, obtaining an input IQ two-path zero intermediate frequency low sampling signal with an intermediate frequency of zero by the extracted sampling rate of 2 x 50MHz, storing the obtained input IQ two-path zero intermediate frequency low sampling signal by a memory, using the input IQ two-path zero intermediate frequency low sampling signal as a playback IQ two-path zero intermediate frequency low sampling signal during playback, wherein the playback IQ two-path zero intermediate frequency low sampling signal is identical to the input IQ two-path zero intermediate frequency low sampling signal, and playing back the IQ two-path zero intermediate frequency low sampling signal for signal playback.
The input frequency band number is obtained after about 500ns, the playback frequency band number is stored, then the input IQ two-way zero intermediate frequency low sampling signals are obtained after about 500ns, the obtained input IQ two-way zero intermediate frequency low sampling signals are stored and used as the playback IQ two-way zero intermediate frequency low sampling signals during playback, and the playback IQ two-way zero intermediate frequency low sampling signals and the playback frequency band number are in one-to-one correspondence and are synchronous.
Thus, when 10ms data is stored using the conventional method, the required storage space is 16×800mhz×0.01s=128 Mbit, whereas when 10ms data is stored using the method, the required storage space is 16bit×2×50mhz×0.01s=16 Mbit, and the required storage space is reduced, and the storage may be internal storage of the FPGA or external storage.
Step S5 comprises the steps of:
s51, reading playback IQ two paths of zero intermediate frequency low sampling signals from a memory, and reading playback band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the memory according to the playback IQ two paths of zero intermediate frequency low sampling signals;
s52, according to interference requirements, performing interference pattern signal processing operation on the playback IQ two-path zero intermediate frequency low sampling signals read in the step S51 to obtain IQ two-path zero intermediate frequency low sampling signals added with interference patterns;
s53, selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number read in the step S51.
Specifically, the playback IQ two-path zero intermediate frequency low sampling signals are read out from the memory to perform signal processing operations such as frequency shift, interference adding and the like, and the IQ two-path zero intermediate frequency low sampling signals added with the interference pattern are obtained.
And when the playback IQ two paths of zero intermediate frequency low sampling signals are read, simultaneously reading a playback frequency band number frequency band 6 corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals and sending the playback frequency band number frequency band 6 to the NCO local oscillator array, and obtaining the local oscillator frequency 120MHz corresponding to the playback frequency band number frequency band 6 as the local oscillator frequency of the interpolation/up-conversion module.
Specifically, the IQ two paths of zero intermediate frequency low sampling signals added with the interference pattern and the local oscillation frequency of the interpolation/up-conversion module are subjected to interpolation/up-conversion operation to obtain an output digital signal with the same frequency band as the input analog signal, namely, the reverse operation is performed for 8 times playback to obtain the output digital signal.
Example 2
Referring to fig. 2 and 3, the present embodiment provides a low storage resource consumption full pulse storage DRFM system, comprising:
a high-speed AD conversion unit for converting an input analog signal into a frequency-measuring digital signal and an input digital signal with the same sampling rate and transmitting the frequency-measuring digital signal and the input digital signal;
the frequency measurement unit is used for receiving and calculating the position of the central frequency point of the frequency measurement digital signal, analyzing the frequency band of the central frequency point of the frequency measurement digital signal according to the position of the central frequency point of the frequency measurement digital signal, and transmitting the obtained frequency band to the control unit;
the delay unit is used for setting signal delay time according to the frequency band calculation time of the frequency measurement unit, receiving an input digital signal, and transmitting the input digital signal to the down-conversion/extraction unit after the signal delay time delay;
the control unit is used for receiving the frequency band sent by the frequency measurement unit, matching the input frequency band number corresponding to the current frequency band and respectively sending the obtained input frequency band number to the NCO local oscillator array unit and the storage unit;
the NCO local oscillator array unit is used for receiving the input frequency band number, selecting the local oscillator frequency of the down-conversion/extraction unit according to the input frequency band number, and providing the selected local oscillator frequency of the down-conversion/extraction unit for the down-conversion/extraction unit;
the down-conversion/extraction unit is used for receiving the local oscillation frequency of the down-conversion/extraction unit and the input digital signal, performing down-conversion/extraction operation on the input digital signal and the local oscillation frequency of the down-conversion/extraction unit to obtain IQ two paths of zero intermediate frequency low sampling signals, and sending the IQ two paths of zero intermediate frequency low sampling signals to the storage unit;
a storage unit for receiving and storing an input band number, the input band number being used as a playback band number at the time of playback; receiving and storing the IQ two paths of zero intermediate frequency low sampling signals as playback IQ two paths of zero intermediate frequency low sampling signals for use during playback, wherein playback frequency band numbers correspond to the playback IQ two paths of zero intermediate frequency low sampling signals one by one;
the control unit is also used for sending the playback IQ two paths of zero intermediate frequency low sampling signals in the storage unit to the signal processing unit, reading the playback frequency band number corresponding to the playback frequency band number in the storage unit, and sending the playback frequency band number to the NCO local oscillator array unit;
the NCO local oscillator array unit is also used for receiving the playback frequency band number, selecting interpolation/up-conversion local oscillator frequency according to the playback frequency point, and sending the interpolation/up-conversion local oscillator frequency to the interpolation/up-conversion unit;
the signal processing unit is used for receiving and replaying the IQ two-way zero intermediate frequency low sampling signals, performing interference pattern signal processing on the IQ two-way zero intermediate frequency low sampling signals to obtain the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns, and sending the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns to the interpolation/up-conversion unit;
the interpolation/up-conversion unit is used for receiving interpolation/up-conversion local oscillation frequency and IQ two paths of zero intermediate frequency low sampling signals added with interference patterns, and performing interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain output digital signals with the same frequency band as the input analog signals;
and the high-speed DA conversion unit is used for converting the output digital signal into an output analog signal.
Wherein, the frequency measurement unit includes:
the sampling module is used for continuously acquiring n points of the frequency measurement digital signal;
the frequency band calculation module is used for calculating the positions of the central frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the central frequency points of the n points to obtain the frequency band of the central frequency point of the frequency measurement digital signal;
and the frequency band sending module is used for sending the frequency band obtained by the frequency band calculating module to the control unit.
Wherein the control unit includes:
the input frequency point analysis module is used for receiving the frequency band sent by the frequency band sending module and determining an input frequency band number corresponding to the current frequency band;
the input frequency band sending module is used for respectively sending the obtained input frequency band numbers to the NCO local oscillator array unit and the storage unit;
the playback signal transmitting module is used for controlling the storage unit to transmit playback IQ two paths of zero intermediate frequency low sampling signals to the signal processing unit;
the playback frequency point acquisition module is used for acquiring playback frequency band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the storage unit;
and the playback frequency band sending module is used for sending the acquired playback frequency band number to the NCO local oscillator array unit.
Wherein, NCO local oscillator array unit includes:
the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
the input frequency point matching module is used for receiving an input frequency band number and selecting a local oscillation frequency point corresponding to the input frequency band number as a down-conversion/extraction local oscillation frequency according to the input frequency band number;
and the playback frequency point matching module is used for receiving the playback frequency band number and selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number.
Wherein the storage unit includes:
the signal storage module is used for receiving the IQ two-path zero intermediate frequency low sampling signals, storing the IQ two-path zero intermediate frequency low sampling signals as playback IQ two-path zero intermediate frequency low sampling signals during playback, and sending the playback IQ two-path zero intermediate frequency low sampling signals to the signal processing unit;
and the frequency point storage module is used for receiving the input frequency band number and storing the input frequency band number to obtain the playback frequency band number.
Claims (10)
1. The full pulse storage DRFM method with low storage resource consumption is characterized by comprising the following steps:
s1, converting an input analog signal into a digital signal through an AD converter, wherein the digital signal is used as a frequency measurement digital signal and an input digital signal respectively;
s2, calculating the position of a central frequency point of the frequency-measuring digital signal, analyzing according to the position of the central frequency point of the frequency-measuring digital signal to obtain a frequency band of the central frequency point of the frequency-measuring digital signal, matching a corresponding input frequency band number according to the current frequency band, and storing the input frequency band number to be used as a playback frequency band number during playback;
s3, selecting the local oscillation frequency of the down-conversion/extraction module according to the input frequency band number obtained in the step S2;
s4, setting signal delay time according to the calculation time of the frequency band where the center frequency point of the frequency measurement digital signal is located in the step S2, performing down-conversion/extraction operation on the input digital signal according to the signal delay time and the local oscillation frequency of the down-conversion/extraction module to obtain and store two paths of zero intermediate frequency low sampling signals of the input IQ, and using the two paths of zero intermediate frequency low sampling signals as playback IQ during playback;
s5, reading the stored playback IQ two-path zero intermediate frequency low sampling signals and performing interference pattern signal processing to obtain the IQ two-path zero intermediate frequency low sampling signals added with the interference patterns; reading a playback frequency band number corresponding to the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns, and selecting the local oscillation frequency of the interpolation/up-conversion module according to the playback frequency band number;
s6, carrying out interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain an output digital signal with the same frequency band as the input analog signal;
s7, converting the output digital signal into an output analog signal through DA.
2. The low storage resource consumption full pulse storage DRFM method of claim 1, wherein said step S2 comprises the steps of:
s21, continuously acquiring n points of the frequency measurement digital signal, calculating the positions of the center frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the center frequency points of the n points to obtain the frequency band of the center frequency point of the frequency measurement digital signal;
s22, matching the corresponding input frequency band number according to the current frequency band;
s23, storing the input band number obtained in step S22, and using the stored input band number as a playback band number.
3. The low storage resource consumption full pulse storage DRFM method of claim 2, wherein said step S3 comprises the steps of:
s31, an NCO local oscillation array is established, wherein the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
s32, selecting a local oscillation frequency point corresponding to the input frequency band number as the down-conversion/extraction local oscillation frequency according to the input frequency band number obtained in the step S2.
4. The low storage resource consumption full pulse storage DRFM method of claim 3, wherein said step S4 includes the steps of:
s41, calculating the time setting signal delay time of the frequency band according to the step S21;
s42, after the input digital signal is delayed according to the signal delay time, performing down-conversion/extraction operation with the local oscillation frequency of the corresponding down-conversion/extraction module to obtain two paths of zero intermediate frequency low sampling signals of the input IQ;
s43, storing the two paths of zero intermediate frequency low sampling signals of the input IQ as the two paths of zero intermediate frequency low sampling signals of the playback IQ during playback, and enabling the playback frequency band numbers to correspond to the two paths of zero intermediate frequency low sampling signals of the playback IQ one by one.
5. The low storage resource consumption full pulse storage DRFM method of claim 4, wherein said step S5 includes the steps of:
s51, reading playback IQ two paths of zero intermediate frequency low sampling signals from a memory, and reading playback band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the memory according to the playback IQ two paths of zero intermediate frequency low sampling signals;
s52, according to interference requirements, performing interference pattern signal processing operation on the playback IQ two-path zero intermediate frequency low sampling signals read in the step S51 to obtain IQ two-path zero intermediate frequency low sampling signals added with interference patterns;
s53, selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number read in the step S51.
6. A low storage resource consumption full pulse storage DRFM system, comprising:
a high-speed AD conversion unit for converting an input analog signal into digital signals, which are used as a frequency-measurement digital signal and an input digital signal, respectively;
the frequency measurement unit is used for receiving and calculating the position of the central frequency point of the frequency measurement digital signal, analyzing the frequency band of the central frequency point of the frequency measurement digital signal according to the position of the central frequency point of the frequency measurement digital signal, and transmitting the obtained frequency band to the control unit;
the delay unit is used for setting signal delay time according to the frequency band calculation time of the frequency measurement unit, receiving an input digital signal, and transmitting the input digital signal to the down-conversion/extraction unit after the signal delay time delay;
the control unit is used for receiving the frequency band sent by the frequency measurement unit, matching the input frequency band number corresponding to the current frequency band and respectively sending the obtained input frequency band number to the NCO local oscillator array unit and the storage unit;
the NCO local oscillator array unit is used for receiving the input frequency band number, selecting the local oscillator frequency of the down-conversion/extraction unit according to the input frequency band number, and providing the selected local oscillator frequency of the down-conversion/extraction unit for the down-conversion/extraction unit;
the down-conversion/extraction unit is used for receiving the local oscillation frequency of the down-conversion/extraction unit and the input digital signal, performing down-conversion/extraction operation on the input digital signal and the local oscillation frequency of the down-conversion/extraction unit to obtain IQ two paths of zero intermediate frequency low sampling signals, and sending the IQ two paths of zero intermediate frequency low sampling signals to the storage unit;
a storage unit for receiving and storing an input band number, the input band number being used as a playback band number at the time of playback; receiving and storing the IQ two paths of zero intermediate frequency low sampling signals, and using the IQ two paths of zero intermediate frequency low sampling signals as playback IQ two paths of zero intermediate frequency low sampling signals during playback, wherein playback frequency band numbers are in one-to-one correspondence with the playback IQ two paths of zero intermediate frequency low sampling signals;
the control unit is also used for sending the playback IQ two paths of zero intermediate frequency low sampling signals in the storage unit to the signal processing unit, reading the playback frequency band number corresponding to the playback frequency band number in the storage unit, and sending the playback frequency band number to the NCO local oscillator array unit;
the NCO local oscillator array unit is also used for receiving the playback frequency band number, selecting interpolation/up-conversion local oscillator frequency according to the playback frequency point, and sending the interpolation/up-conversion local oscillator frequency to the interpolation/up-conversion unit;
the signal processing unit is used for receiving and replaying the IQ two-way zero intermediate frequency low sampling signals, performing interference pattern signal processing on the IQ two-way zero intermediate frequency low sampling signals to obtain the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns, and sending the IQ two-way zero intermediate frequency low sampling signals added with the interference patterns to the interpolation/up-conversion unit;
the interpolation/up-conversion unit is used for receiving interpolation/up-conversion local oscillation frequency and IQ two paths of zero intermediate frequency low sampling signals added with interference patterns, and performing interpolation/up-conversion operation on the IQ two paths of zero intermediate frequency low sampling signals added with the interference patterns and the local oscillation frequency of the interpolation/up-conversion module to obtain output digital signals with the same frequency band as the input analog signals;
and the high-speed DA conversion unit is used for converting the output digital signal into an output analog signal.
7. The low storage resource consumption full pulse storage DRFM system of claim 6, wherein the frequency measurement unit includes:
the sampling module is used for continuously acquiring n points of the frequency measurement digital signal;
the frequency band calculation module is used for calculating the positions of the central frequency points of the n points by using a rapid frequency measurement algorithm, and analyzing the positions of the central frequency points of the n points to obtain the frequency band of the central frequency point of the frequency measurement digital signal;
and the frequency band sending module is used for sending the frequency band obtained by the frequency band calculating module to the control unit.
8. The low storage resource consumption full pulse storage DRFM system of claim 7, wherein the control unit includes:
the input frequency point analysis module is used for receiving the frequency band sent by the frequency band sending module and determining an input frequency band number corresponding to the current frequency band;
the input frequency band sending module is used for respectively sending the obtained input frequency band numbers to the NCO local oscillator array unit and the storage unit;
the playback signal transmitting module is used for controlling the storage unit to transmit playback IQ two paths of zero intermediate frequency low sampling signals to the signal processing unit;
the playback frequency point acquisition module is used for acquiring playback frequency band numbers corresponding to the playback IQ two paths of zero intermediate frequency low sampling signals from the storage unit;
and the playback frequency band sending module is used for sending the acquired playback frequency band number to the NCO local oscillator array unit.
9. The low storage resource consumption full pulse memory DRFM system of claim 8, wherein said NCO local oscillator array unit comprises:
the NCO local oscillation array comprises a plurality of NCO with equal frequency intervals, each NCO generates a local oscillation frequency point, and each local oscillation frequency point corresponds to an input frequency band number and/or a playback frequency band number;
the input frequency point matching module is used for receiving an input frequency band number and selecting a local oscillation frequency point corresponding to the input frequency band number as a down-conversion/extraction local oscillation frequency according to the input frequency band number;
and the playback frequency point matching module is used for receiving the playback frequency band number and selecting a local oscillation frequency point corresponding to the playback frequency band number as the local oscillation frequency of the interpolation/up-conversion module through the NCO local oscillation array according to the playback frequency band number.
10. The low storage resource consumption full pulse storage DRFM system of claim 9, wherein the storage unit includes:
the signal storage module is used for receiving and storing the IQ two paths of zero intermediate frequency low sampling signals, and is used as the playback IQ two paths of zero intermediate frequency low sampling signals during playback, and the playback IQ two paths of zero intermediate frequency low sampling signals are sent to the signal processing unit;
and the frequency point storage module is used for receiving the input frequency band number and storing the input frequency band number to obtain the playback frequency band number.
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