CN116520262B - Radar interference signal generation method and system based on vector signal source - Google Patents
Radar interference signal generation method and system based on vector signal source 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
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Abstract
The application discloses a radar interference signal generation method and a system based on a vector signal source, which are used for downloading carrier wave files from an upper computer; the waveform file is in an ARB format generated by the upper computer according to the radar signal of the target; loading an interference signal from the waveform file in the ARB format through the ARB digital baseband mode; the method comprises the steps of regularly receiving frequency offset of a current time beat sent by an upper computer through a timer according to a preset frequency offset list; and setting the frequency offset of the interference signal according to the frequency offset of the current time beat to obtain the speed dragging interference signal. The frequency offset of the interference signal is set by the vector signal source according to the frequency offset of the current time beat, and the frequency offset is controlled by using the time beat, so that the frequency offset can be kept to be fixed in the time interval of the adjacent time beat. The speed dragging interference is realized, and the calculated amount is saved.
Description
Technical Field
The application relates to the technical field of radar interference, in particular to a method and a system for generating radar interference signals based on a vector signal source.
Background
The radar technology is widely used in the application of information detection equipment, in key technologies such as target detection, identification and tracking, along with the continuous development and innovation of the radar technology, the receiver of a radar signal is required to be subjected to deceptive interference, namely an interference signal is generated, so that the acquisition and decision of the receiver on a real signal are disturbed, the existing interference signal comprises speed dragging, distance dragging, multiple false speeds, multiple false distances and the like, the nature of the interference of the speed dragging is Doppler frequency shift caused by the relative radial speeds of the radar signal of a target and the receiver, and the receiver can calculate the relative speed of the target through Doppler translation, so that guidance is realized. Using the velocity-drag construct a series of false velocities, the receiver can be misled. In the conventional method for generating a velocity towing signal, the frequency offset of each pulse of the radar signal needs to be calculated, so that the calculation amount is huge, and for the radar signal with the total duration of 100 seconds and the pulse repetition period of 1 microsecond, 1 hundred million times of calculation is needed. The interference signal generation is complex in calculation, overlong in operation time, poor in interference of the interference signal and the like, and the interference signal generation is affected.
Disclosure of Invention
The application aims to provide a radar interference signal generating method and system based on a vector signal source, which downloads a pulse waveform file of an interference signal from an upper computer through the vector signal source, generates the interference signal, regularly receives the frequency offset of the current time beat forwarded by a timer from the upper computer, sets the frequency offset of the interference signal according to the frequency offset of the current time beat, and uses the time beat to control the frequency offset so that the frequency offset can be kept at a fixed frequency offset in the time interval of the adjacent time beat. The speed dragging interference is realized, and the calculated amount is saved.
In one aspect, the application provides a radar interference signal generating method based on a vector signal source, which comprises the following steps:
s1, downloading a carrier file from an upper computer; the waveform file is in an ARB format generated by the upper computer according to the radar signal of the target;
s2, loading an interference signal from an ARB format waveform file through an ARB digital baseband mode;
s3, regularly receiving the frequency offset of the current time beat sent by the upper computer through the timer according to a preset frequency offset list;
and S4, setting the frequency offset of the interference signal according to the frequency offset of the current time beat, and obtaining the speed dragging interference signal.
Further, the frequency offset list includes time beats and frequency offsets corresponding to each time beat, and the time beats are time points corresponding to time lengths after the radar signals are sent out from the target.
Further, the process of obtaining the frequency offset list is as follows:
s31, obtaining the radar signal frequency of the target and the relative radial speed of a receiver of the target;
s32, calculating a frequency offset df according to the radar signal frequency of the target and the relative radial speed of a receiver of the target; recording the time length of sending radar signals from the target at the moment, and taking the value of the time length as the time point of the current time beat;
s33, storing the relative frequency deviation corresponding to the current time beat into a frequency deviation list in a one-to-one correspondence manner;
s34, changing the radar signal frequency of the target and the relative radial speed of a receiver of the target, and repeating the steps S31-S34 to obtain a frequency offset list.
Further, the generation process of the waveform file in the ARB format is as follows:
s11, acquiring a radar signal of a target, and converting a pulse sequence of the radar signal into a pulse sequence of an interference signal through a speed dragging interference algorithm;
s12, demodulating and converting the pulse sequence of the interference signal to obtain an I signal sequence and a Q signal sequence;
and S13, writing the I signal sequence and the Q signal sequence into the baseband signal file according to the ARB signal coding format to obtain the ARB format waveform file.
Further, the specific process of step S12 is:
the pulse sequences of the interference signals are respectively demodulated according to the following formula:
demodulating according to formula (1) to obtain an I signal sequence, demodulating according to formula (2) to obtain a Q signal sequence, wherein T is a sampling interval, s (T) is the pulse amplitude of an interference signal at time T, omega 0 Is the angular velocity of the sampled signal.
Further, the baseband signal file includes a header and a tag inserted into the header, the tag including TYPE, CLOCK, LEVEL OFFS, and WAVEFORM, wherein CLOCK represents a sampling frequency.
Further, the process of obtaining the waveform file in the ARB format is as follows:
converting the I signal sequence and the Q signal sequence into I and Q result values expressed in hexadecimal decimal format respectively; inserting the I and Q result values in binary format into a WAVEFORM tag; obtaining a WAVEFORM label to be inserted;
and firstly inserting a TYPE tag into the header of the baseband signal file, and inserting a CLOCK, a LEVEL OFFS and a WAVEFORM tag to be inserted in any order to obtain the WAVEFORM file in the ARB format.
In a second aspect, the present application provides a radar interference signal generating system based on a vector signal source, including:
the upper computer is used for generating a waveform file in an ARB format according to a radar signal of a target, generating a frequency offset list and transmitting frequency offsets corresponding to each time beat according to the frequency offset list;
the timer is used for obtaining the frequency offset corresponding to the current time beat from the upper computer at fixed time and simultaneously sending the frequency offset of the current time beat to the vector signal source;
the vector signal source is used for downloading the carrier wave file and loading an interference signal from the ARB-format waveform file through the ARB digital baseband mode; and receiving the frequency offset of the current time beat from the timer at fixed time, and setting the frequency offset of the interference signal according to the frequency offset of the current time beat to obtain the speed dragging interference signal.
Further, the frequency offset list includes time beats and frequency offsets corresponding to each time beat, and the time beats are time points corresponding to time lengths after the radar signals are sent out from the target.
The application has the beneficial effects that:
the application downloads the pulse waveform file of the interference signal from the upper computer through the vector signal source, generates the interference signal, and regularly receives the frequency offset of the current time beat forwarded by the timer from the upper computer, the vector signal source sets the frequency offset of the interference signal according to the frequency offset of the current time beat, and the time beat is used for controlling the frequency offset, so that the frequency offset can be kept at a fixed frequency offset in the time interval of the adjacent time beat. The speed dragging interference is realized, the frequency offset of the signal source is set by using a timer through the upper computer according to the pre-calculated frequency offset list, and no matter how long the radar signal is, a large amount of calculation is not needed, so that the calculation amount can be greatly saved.
Drawings
FIG. 1 is a schematic flow chart of a radar interference signal generating method based on a vector signal source;
FIG. 2 is a method for generating a list of frequency offsets in an embodiment of the present application;
fig. 3 is a block diagram of a radar interference signal generating system based on a vector signal source according to the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
In addition, descriptions of well-known structures, functions and configurations may be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the present disclosure.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
Before introducing the technical scheme of the application, concepts to be involved are described:
1. baseband signal generation
Baseband signal definition: the baseband signal is the original signal that has not been modulated.
ARB (arbitrary waveform) definition: ARB is a software defined signal encoding format stored in RAM of the signal source. The process of the ARB mode before DAC is implemented on PC by corresponding software (Agilent signal studio, matlab, visual) which encodes the data and stores it in the form of waveform file in RAM in the signal source. The waveform file is played back by the vector signal source in a loop.
The pulses are written to the baseband signal file by means of user-defined pulse parameters. And then the signal file is sent to the signal source through the network port and loaded.
2. Speed towing
The velocity trailing aims to realize false Doppler shift by controlling the frequency shift of the pulse, so that a receiver acquires a wrong velocity value, and interference is caused.
Doppler shift: when the sound source and the sound wave receiver are in relative motion, the frequency of the sound source received by the receiver is different from the frequency emitted by the sound source, and the change of the frequency is related to the relative motion speed of the sound source and the sound wave receiver. This phenomenon is called doppler effect, and the amount of change in frequency is called doppler shift.
To calculate the interference signal, it is first necessary to know the pulse parameters of the original radar signal. For speed towing interference, the essence is Doppler frequency shift caused by the relative radial speed of a radar signal of a target and the receiver, and the receiver can calculate the relative speed of the target through the Doppler frequency shift, so that guidance is realized. If a series of false speeds are constructed using speed dragging, the receiver may be misled.
Input parameters for speed dragging:
duration of holding: refers to the time for which the target maintains the speed unchanged;
towing duration: refers to the time that interference is required;
drag-off duration: the duration of the stop signal after the interference is finished is indicated, and the process is to unlock the radar;
towing acceleration: refers to the acceleration of the build target during the disturbance.
3. Speed disturbance implementation
Interference algorithm: the final manifestation of velocity towing is doppler shift, so the formula needs to obtain the relative frequency offset df, where df=2×speed×freq/C, speed is the relative radial velocity of the targeted receiver, freq is the radar signal frequency, and C is the speed of light.
For the traditional speed towing algorithm, we need to calculate the frequency offset of each pulse of the radar signal, which is very computationally intensive, and for a radar signal with a total duration of 100 seconds and a pulse repetition period of 1 microsecond, we need to calculate 1 million times. Therefore, in order to save the calculation amount, the present application adopts the following solution.
Example 1
As shown in fig. 1, embodiment 1 provides a radar interference signal generating method based on a vector signal source, including the following steps:
s1, downloading a carrier file from an upper computer; the waveform file is in an ARB format generated by the upper computer according to the radar signal of the target;
specifically, the generation process of the waveform file in the ARB format is as follows:
s11, acquiring a radar signal of a target, and converting a pulse sequence of the radar signal into a pulse sequence of an interference signal through a speed dragging interference algorithm;
s12, demodulating and converting the pulse sequence of the interference signal to obtain an I signal sequence and a Q signal sequence;
the specific process of step S12 is as follows:
the pulse sequences of the interference signals are respectively demodulated according to the following formula:
demodulating according to formula (1) to obtain an I signal sequence, demodulating according to formula (2) to obtain a Q signal sequence, wherein T is a sampling interval, and the SMW200A vector signal source supports a maximum sampling rate of 512MHz, so that the minimum sampling interval is 1/512M, s (T) is the pulse amplitude of an interference signal at a moment T, and the pulse amplitude is integrated to omega 0 Is the angular velocity of the sampled signal. The signal is described using an IQ waveform, with each sample point represented by a pair of I/Q signals.
And S13, writing the I signal sequence and the Q signal sequence into the baseband signal file according to the ARB signal coding format to obtain the ARB format waveform file.
The baseband signal file includes a header and a tag inserted into the header, and the tag into which each WAVEFORM must be inserted includes TYPE, CLOCK, LEVEL OFFS, and WAVEFORM, where CLOCK represents the sampling frequency, and all other tags are inserted in any order after the TYPE tag is inserted. The I signal sequence and the Q signal sequence need to be converted into binary format to insert the WAVEFORM tag, in particular:
the value range of the I and Q data is-1.0 to +1.0, and the waveform modulation range of the 16-bit digital-to-analog converter is-32767 to +32767, which correspond to each other.
This 16-bit signed integer must be converted to I and Q result values represented in hexadecimal small-end format. The data must then be inserted in binary format into the "WAVEFORM" tag as follows:
1. calculating the length
2. length=i/Q value versus number 4+1=20×4+1=81 bytes
3. The string { WAVEFORM-81: # is inserted at the beginning of the data set
4. Insert symbols at end of dataset }
And firstly inserting a TYPE tag into the header of the baseband signal file, and inserting a CLOCK, a LEVEL OFFS and a WAVEFORM tag to be inserted in any order to obtain the WAVEFORM file in the ARB format. After the waveform file is obtained, the waveform file can be downloaded into a vector signal source through an upper computer, and then an interference signal is loaded out through an ARB digital baseband mode.
S2, loading an interference signal from an ARB format waveform file through an ARB digital baseband mode;
s3, regularly receiving the frequency offset of the current time beat sent by the upper computer through the timer according to a preset frequency offset list;
and S4, setting the frequency offset of the interference signal according to the frequency offset of the current time beat, and obtaining the speed dragging interference signal.
Specifically, the frequency offset list includes time beats and frequency offsets corresponding to each time beat, where the time beats are time points corresponding to time lengths after the radar signals are sent out from the target. As shown in fig. 2, the process of obtaining the frequency offset list is:
s31, obtaining the radar signal frequency of the target and the relative radial speed of a receiver of the target;
s32, calculating a frequency offset df according to the radar signal frequency of the target and the relative radial speed of a receiver of the target; recording the time length of sending radar signals from the target at the moment, and taking the value of the time length as the time point of the current time beat;
s33, storing the relative frequency deviation corresponding to the current time beat into a frequency deviation list in a one-to-one correspondence manner;
s34, changing the radar signal frequency of the target and the relative radial speed of a receiver of the target, and repeating the steps S31-S34 to obtain a frequency offset list.
As in table 1, an example of a list of frequency offsets is given:
table 1 frequency offset list format
| Time beat (distance start simulation time, ms) | Frequency offset (Hz) |
| 5 | 253 |
| 10 | 267 |
| … | … |
It will be appreciated that in order to reduce the amount of computation, the present application uses the time beats to control the frequency offset of the pulse signal so that it maintains a fixed frequency offset over a range of time beats. The frequency offset list is only needed to be calculated in advance, and then the upper computer is used for setting the frequency offset of the signal by using the timer, so that a large amount of calculation is not needed for the radar signal of which length is not needed. Specifically, several parameters including a holding time length, a towing stopping time length and a towing acceleration are needed for realizing the speed towing. The speed is not changed in the holding stage, namely, the signal is not subjected to frequency offset interference, and the original radar signal is sent out. The disturbance signal is turned off during the stall phase. In the towing phase, frequency offset is obtained according to the formula df=2 speed freq/C, speed is the relative radial velocity, freq is the radar frequency, and C is the speed of light. And calculating the frequency deviation of each time point according to the time beat, and controlling the frequency deviation of the radar signal at each time point by the upper computer to realize the speed dragging interference. It will be appreciated that the interference signal is derived from the radar signal being offset by a corresponding frequency over each time beat.
Example 2
As shown in fig. 3, this embodiment is to implement the interference signal generating method described in embodiment 1, and provides a radar interference signal generating system based on a vector signal source, including:
the upper computer is used for generating a waveform file in an ARB format according to a radar signal of a target, generating a frequency offset list and transmitting frequency offsets corresponding to each time beat according to the frequency offset list;
the timer is used for obtaining the frequency offset corresponding to the current time beat from the upper computer at fixed time and simultaneously sending the frequency offset of the current time beat to the vector signal source;
the vector signal source is used for downloading the carrier wave file and loading an interference signal from the ARB-format waveform file through the ARB digital baseband mode; and receiving the frequency offset of the current time beat from the timer at fixed time, and setting the frequency offset of the interference signal according to the frequency offset of the current time beat to obtain the speed dragging interference signal. The frequency offset list comprises time beats and frequency offsets corresponding to the time beats, wherein the time beats are time points corresponding to the time length after the radar signal is sent out from the target.
The foregoing description of the preferred embodiment of the application is not intended to limit the application in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the application.
Claims (6)
1. The radar interference signal generation method based on the vector signal source is characterized by comprising the following steps of:
s1, downloading a carrier file from an upper computer; the waveform file is in an ARB format generated by the upper computer according to the radar signal of the target;
s2, loading an interference signal from an ARB format waveform file through an ARB digital baseband mode;
s3, regularly receiving the frequency offset of the current time beat sent by the upper computer through the timer according to a preset frequency offset list;
the frequency offset list comprises time beats, wherein the frequency offset corresponds to each time beat, and the time beats are time points corresponding to the time length after the radar signal is sent out from the target;
the process for obtaining the frequency offset list comprises the following steps:
s31, obtaining the radar signal frequency of the target and the relative radial speed of a receiver of the target;
s32, calculating a frequency offset df according to the radar signal frequency of the target and the relative radial speed of a receiver of the target; recording the time length of sending radar signals from the target at the moment, and taking the value of the time length as the time point of the current time beat;
s33, storing the relative frequency deviation corresponding to the current time beat into a frequency deviation list in a one-to-one correspondence manner;
s34, changing the radar signal frequency of the target and the relative radial speed of a receiver of the target, and repeating the steps S31-S34 to obtain a frequency offset list;
and S4, setting the frequency offset of the interference signal according to the frequency offset of the current time beat, and obtaining the speed dragging interference signal.
2. The method for generating radar interference signals based on vector signal source according to claim 1, wherein the generation process of the waveform file in ARB format is:
s11, acquiring a radar signal of a target, and converting a pulse sequence of the radar signal into a pulse sequence of an interference signal through a speed dragging interference algorithm;
s12, demodulating and converting the pulse sequence of the interference signal to obtain an I signal sequence and a Q signal sequence;
and S13, writing the I signal sequence and the Q signal sequence into the baseband signal file according to the ARB signal coding format to obtain the ARB format waveform file.
3. The method for generating radar interference signals based on vector signal source according to claim 2, wherein the specific process of step S12 is:
the pulse sequences of the interference signals are respectively demodulated according to the following formula:
demodulating according to formula (1) to obtain an I signal sequence, demodulating according to formula (2) to obtain a Q signal sequence, wherein T is a sampling interval, s (T) is the pulse amplitude of an interference signal at time T, omega 0 Is the angular velocity of the sampled signal.
4. The method of generating a radar interference signal based on a vector signal source according to claim 2, wherein the baseband signal file includes a header and a tag inserted into the header, the tag including TYPE, CLOCK, LEVEL OFFS and WAVEFORM, wherein CLOCK represents a sampling frequency.
5. The method for generating radar interference signals based on vector signal source according to claim 4, wherein the process of obtaining the waveform file in ARB format is:
converting the I signal sequence and the Q signal sequence into I and Q result values expressed in hexadecimal decimal format respectively; inserting the I and Q result values in binary format into a WAVEFORM tag; obtaining a WAVEFORM label to be inserted;
and firstly inserting a TYPE tag into the header of the baseband signal file, and inserting a CLOCK, a LEVEL OFFS and a WAVEFORM tag to be inserted in any order to obtain the WAVEFORM file in the ARB format.
6. Radar interference signal generation system based on vector signal source, characterized by comprising:
the upper computer is used for generating a waveform file in an ARB format according to a radar signal of a target, generating a frequency offset list and transmitting frequency offsets corresponding to each time beat according to the frequency offset list;
the frequency offset list comprises time beats, wherein the frequency offset corresponds to each time beat, and the time beats are time points corresponding to the time length after the radar signal is sent out from the target;
the process for obtaining the frequency offset list comprises the following steps:
obtaining a radar signal frequency of the target and a relative radial velocity of a receiver of the target; calculating a frequency offset based on the radar signal frequency of the target and the relative radial velocity of the receiver of the target; recording the time length of sending radar signals from the target at the moment, and taking the value of the time length as the time point of the current time beat; storing the current time beat and the relative frequency offset corresponding to the current time beat into a frequency offset list in a one-to-one correspondence manner; changing the radar signal frequency of the target and the relative radial speed of a receiver of the target, and repeating the steps to obtain a frequency offset list;
the timer is used for obtaining the frequency offset corresponding to the current time beat from the upper computer at fixed time and simultaneously sending the frequency offset of the current time beat to the vector signal source;
the vector signal source is used for downloading the carrier wave file and loading an interference signal from the ARB-format waveform file through the ARB digital baseband mode; and receiving the frequency offset of the current time beat from the timer at fixed time, and setting the frequency offset of the interference signal according to the frequency offset of the current time beat to obtain the speed dragging interference signal.
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