CN115685108A - Pulse pseudo code system fuze body target simulation system and method thereof - Google Patents
Pulse pseudo code system fuze body target simulation system and method thereof Download PDFInfo
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Abstract
The invention relates to a pulse pseudo code system fuze body target simulation system and a method thereof.A radio frequency subsystem comprises a down-conversion network, an up-conversion network and a frequency synthesizer; the baseband signal processing subsystem comprises an AD acquisition and DOC module, an echo information modulation module, a DUC and DA conversion module which are connected in sequence; the pseudo code correction module and the volume target data module are respectively connected with the echo information modulation module; the display control and interface subsystem is respectively in signal connection with the radio frequency subsystem and the baseband signal processing subsystem and comprises a control computer, a general control interface board and display control software. The invention increases the number of scattering points simulated by the fuze target to 128 points, and the distance and Doppler phase of each scattering point can be independently set. By high sampling of AD and DA, the simulation precision of the distance is improved to 0.125 meter. And (3) expanding the range and the azimuth of the target simulation to 0-20km through pseudo code correction cross-repetition frequency processing.
Description
Technical Field
The invention belongs to the technical field of communication target simulation, and relates to a fuse body target simulation system of a pulse pseudo code system and a method thereof.
Background
There are two main types of existing target simulation methods, one is a Fiber Optic Delay Line (FODL) and the other is a digital frequency memory (DRFM).
The term Fiber Optic Delay Line (FODL) is commonly used to measure the phase noise of radar systems and to test analog repeatable signals for radio systems and outdoor distances of radar systems. These relatively flexible, phase coherent, miniature systems convert the radar's radio frequency signal into an optical signal and delay it with the aid of a certain length of fiber optic line, then convert the delayed optical signal back into radio frequency and introduce doppler shift before transmitting to the radar.
Radio frequency digital storage (DRFM) devices may be used for radar target simulation. Such systems process radar signals digitally. The radio frequency digital storage device downconverts, filters and digitizes the received radio frequency signal. The digitized signal is then saved or modified. This digital signal is then reconverted to an analog signal and mixed to a radio frequency using the same Local Oscillator (LO) as the downconversion. The signal is amplified and retransmitted.
When the fuse body target of the existing pulse pseudo code system is simulated by using an optical fiber delay line (FODL), the FODL cannot generate a time-varying distance-Doppler target and cannot provide continuous distance setting or arbitrary signal attenuation and gain. This method can only simulate a single point target and cannot simulate fine distance changes and speed changes, which greatly compromises the reality of the target simulation.
When the fuse body target of the existing pulse pseudo code system is simulated by using a digital frequency storage (DRFM), the delay of the output of the device is large, and the minimum delay introduced is mainly limited by that a certain period is required for analog-to-digital conversion (ADC) and digital-to-analog conversion (DAC) or analog-to-digital conversion and depends on the bandwidth and the number of bits. Typical minimum distance delays today range from 100ns to 1 mus. Such a large delay results in the inability to simulate a fuze target signal at ultra-close distances.
Disclosure of Invention
The invention provides a system and a method for simulating a fuse body target of a pulse pseudo code system, which solve the problem that the distance change and the speed change of a multi-point body target cannot be flexibly simulated when a super-close target of the fuse of the pulse pseudo code system is simulated.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a fuze body target simulation system of a pulse pseudo code system, which comprises a radio frequency subsystem, a baseband signal processing subsystem and a display control and interface subsystem;
the radio frequency subsystem comprises a down-conversion network, an up-conversion network and a frequency synthesizer; the functions mainly comprise:
a) Receiving a fuse radio frequency signal, and performing power adjustment and down-conversion processing to obtain a low-intermediate frequency signal suitable for AD acquisition;
b) Carrying out up-conversion and power adjustment processing on the low-intermediate frequency signal output by the baseband unit to obtain a radio frequency echo signal;
c) And generating a local oscillator signal required by radio frequency conversion and a clock signal required by baseband work by using the internal clock or the external reference clock, and outputting the reference clock to the outside.
The baseband signal processing subsystem comprises an AD acquisition and DOC module, an echo information modulation module, a DUC and DA conversion module which are connected in sequence; the AD acquisition and DOC module is connected with the down-conversion network, and the DUC and DA conversion module is connected with the up-conversion network; the system also comprises a pseudo code correction module and a volume target data module which are respectively connected with the echo information modulation module;
and the baseband signal processing subsystem is used for acquiring the low and intermediate frequency fuse signals, performing down-conversion processing to obtain the fuse baseband signals, then modulating baseband echo information, and finally obtaining the low and intermediate frequency multi-scattering point body target signals after digital up-conversion and DA conversion.
The display control and interface subsystem is respectively connected with the radio frequency subsystem and the baseband signal processing subsystem through signals and comprises a control computer, a general control interface board and display control software. The realized functions mainly comprise:
a) Setting simulation parameters, controlling the working process of the whole simulator and displaying the current simulation state;
b) Receiving working mode parameters from a fuse and synchronous pulse signals such as PRF (pulse repetition frequency) and the like, and sending the working mode parameters and the synchronous pulse signals to a baseband signal processing subsystem;
c) Calculating the motion track of the point target, further calculating the distance, speed and amplitude information of the point target relative to the fuze, generating corresponding control parameters and sending the control parameters to the baseband signal processing subsystem;
in a second aspect, the invention provides a method for simulating a fuse body target of a pulse pseudo code system, which comprises the following steps:
s1, performing down-conversion and power adjustment on a radio frequency signal from radio detection equipment to obtain a low-intermediate frequency signal suitable for acquisition;
s2, acquiring a baseband signal of the radio detection equipment after signal acquisition and preprocessing (including AD acquisition/DDC/extraction and the like);
s3, carrying out frequency discrimination and phase discrimination on the data, carrying out frequency measurement on the acquired data of the radio detection equipment to realize frequency locking processing, then analyzing the phase of connected pulses to obtain inter-pulse phase information, and finally carrying out correlation processing on the inter-pulse phase information and a pre-stored local pseudo-random code to obtain initial position information of the random code;
s4, delaying the signal (according to the frequency and phase discrimination result, overlapping), and modulating the Doppler frequency and the amplitude to obtain a baseband target echo of the radio detection equipment;
s5, performing digital up-conversion and DA conversion on the baseband target echo to obtain low and intermediate frequency target echo signals of different channels;
and S6, obtaining a required radio frequency target echo signal after up-conversion and power adjustment.
The invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method.
An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to perform the steps of the method.
Compared with the prior art, the invention has the following beneficial effects:
the invention increases the number of scattering points simulated by the fuze target to 128 points, and the distance and Doppler phase of each scattering point can be independently set. By high sampling of AD and DA, the simulation precision of the distance is improved to 0.125 meter. The pseudo code correction cross-repetition frequency processing is adopted, so that the simulated range and azimuth of the target are expanded to 0-20 km.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a schematic diagram of a fuse transmitting signal (without phase modulation error) in the embodiment;
fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
The impulse pseudo-code system fuze body target simulation system comprises a radio frequency subsystem, a baseband signal processing subsystem and a display control and interface subsystem; the functional components of which are shown in figure 1.
1) Radio frequency subsystem
The radio frequency subsystem comprises a down-conversion network, an up-conversion network and a frequency synthesizer, and mainly has the functions of:
a) Receiving a fuse radio frequency signal, and performing power adjustment and down-conversion processing to obtain a low-intermediate frequency signal suitable for AD acquisition;
b) Carrying out up-conversion and power adjustment processing on a low-intermediate frequency signal output by a baseband unit to obtain a radio frequency echo signal;
c) And generating a local oscillator signal required by radio frequency conversion and a clock signal required by baseband work by using an internal clock or an external reference clock, and outputting the reference clock to the outside.
2) Baseband signal processing subsystem
The baseband signal processing subsystem comprises an AD acquisition and DOC module, an echo information modulation module, a DUC and DA conversion module which are connected in sequence; the AD acquisition and DOC module is connected with the down-conversion network, and the DUC and DA conversion module is connected with the up-conversion network; the system also comprises a pseudo code correction module and a volume target data module which are respectively connected with the echo information modulation module;
and the baseband signal processing subsystem is used for acquiring the low and intermediate frequency fuze signals, performing down-conversion processing to obtain fuze baseband signals, then modulating baseband echo information, and finally obtaining low and intermediate frequency multi-scattering point body target signals after digital up-conversion and DA conversion.
3) Display control and interface subsystem
The display control and interface subsystem is respectively in signal connection with the radio frequency subsystem and the baseband signal processing subsystem and comprises a control computer, a general control interface board and display control software. The realized functions mainly comprise:
a) Setting simulation parameters, controlling the working process of the whole simulator and displaying the current simulation state;
b) Receiving working mode parameters from a fuse and synchronous pulse signals such as PRF (pulse repetition frequency) and the like, and sending the working mode parameters and the synchronous pulse signals to a baseband signal processing subsystem;
c) Calculating the motion track of the point target, further calculating the distance, speed and amplitude information of the point target relative to the fuze, generating corresponding control parameters and sending the control parameters to the baseband signal processing subsystem;
in this embodiment, the radar operating principle:
the transmission signal of the pulse pseudo code system fuze can be expressed as:
wherein,
f c is the carrier frequency;
xi is a 0-pi phase modulation error of the fuse transmitter;
and a is the carrier amplitude.
As shown in fig. 2, when the fuse transmitter 0-pi phase modulation error ξ =0, the fuse transmission signal can be expressed as:
wherein,
obviously, C (t) and C' (t) satisfy
C(t)＝-2·[C′(t)-0.5] (4)
The echo simulation principle is as follows:
the fuze emission signal is shown as a formula (1). The true echo signal of the target can be expressed as:
because the target delay tau is less than the inherent delay tau' of the simulator, the simulator echo simulation has one-time distance ambiguity, so tau i (t) satisfies
T r ≤τ i (t)≤2T r －T p (6)
τ i (t)≤2T r －T p To avoid obscuring the echo signals across multiple range bins.
In order to simulate the echo signal of a target, a complex envelope is first calculated, the echo signal of which does not contain pseudo-code phase modulation information
Then using C (t-tau) i (t)). C (t) (the initial phase of C (t) is a certain fixed value) to make pre-phase-shifting operation on the above-mentioned formula signal so as to obtain the invented product
Extracting pseudo-random phase modulation information e of fuse transmitting signal by simulator j·C′(t)·(π+ξ) The pre-generated data shown in the formula (7) is subjected to real-time digital phase shift (complex multiplication) by using the pre-generated data to obtain a complex envelope of an analog echo signal
Then the S is converted into frequency ri (t) conversion to fuze-transmitted coherent carrier frequency
To obtain the radio frequency analog echo signal
From the formula (4), C (t) and C' (t) satisfy
C(t)·cos(x)＝cos(x+C′(t)·π) (11)
Can be changed into
As shown in fig. 3, a method for fuze target of pulse pseudo code system includes the following steps:
s1, performing down-conversion and power adjustment on a radio frequency signal from radio detection equipment to obtain a low-intermediate frequency signal suitable for acquisition;
s2, acquiring a baseband signal of the radio detection equipment after signal acquisition and preprocessing (including AD acquisition/DDC/extraction and the like);
s3, carrying out frequency discrimination and phase discrimination on the data, carrying out frequency measurement on the acquired data of the radio detection equipment to realize frequency locking processing, then analyzing the phase of connected pulses to obtain inter-pulse phase information, and finally carrying out correlation processing on the inter-pulse phase information and a pre-stored local pseudo-random code to obtain initial position information of the random code;
s4, delaying the signal (according to the frequency and phase discrimination result, overlapping), and modulating the Doppler frequency and the amplitude to obtain a baseband target echo of the radio detection equipment;
s5, performing digital up-conversion and DA conversion on the baseband target echo to obtain low and intermediate frequency target echo signals of different channels;
and S6, obtaining a required radio frequency target echo signal after up-conversion and power adjustment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.
Claims (7)
1. The fuse body target simulation system with the pulse pseudo code system is characterized by comprising a radio frequency subsystem, a baseband signal processing subsystem and a display control and interface subsystem;
the radio frequency subsystem comprises a down-conversion network, an up-conversion network and a frequency synthesizer;
the baseband signal processing subsystem comprises an AD acquisition and DOC module, an echo information modulation module, a DUC and DA conversion module which are connected in sequence; the AD acquisition and DOC module is connected with the down-conversion network, and the DUC and DA conversion module is connected with the up-conversion network; the system also comprises a pseudo code correction module and a volume target data module which are respectively connected with the echo information modulation module;
the display control and interface subsystem is respectively in signal connection with the radio frequency subsystem and the baseband signal processing subsystem and comprises a control computer, a general control interface board and display control software.
2. The fuze target simulation system of claim 1, wherein the radio frequency subsystem is configured to receive a fuze radio frequency signal, and perform power adjustment and down-conversion processing to obtain a low-intermediate frequency signal suitable for AD acquisition;
carrying out up-conversion and power adjustment processing on a low-intermediate frequency signal output by a baseband unit to obtain a radio frequency echo signal;
and generating a local oscillator signal required by radio frequency conversion and a clock signal required by baseband work by using the internal clock or the external reference clock, and outputting the reference clock to the outside.
3. The fuze target simulation system of claim 1, wherein the baseband signal processing subsystem is configured to collect low-if fuze signals, perform down-conversion to obtain fuze baseband signals, perform modulation on baseband echo information, and perform digital up-conversion and DA-conversion to obtain low-if multi-scattering point target signals.
4. The fuse body target simulation system of claim 1, wherein the display control and interface subsystem controls the whole simulator operation process without setting simulation parameters, and displays the current simulation state;
receiving working mode parameters from a fuse and synchronous pulse signals such as PRF (pulse repetition frequency) and the like, and sending the working mode parameters and the synchronous pulse signals to a baseband signal processing subsystem;
and calculating the motion track of the point target, further calculating the distance, speed and amplitude information of the point target relative to the fuse, generating corresponding control parameters and sending the control parameters to the baseband signal processing subsystem.
5. The method for simulating the fuse body target with the pulse pseudo code system is characterized in that the fuse body target simulation system with the pulse pseudo code system according to any one of claims 1 to 4 is adopted, and the method comprises the following steps:
s1, performing down-conversion and power adjustment on a radio frequency signal from radio detection equipment to obtain a low-intermediate frequency signal suitable for acquisition;
s2, acquiring a baseband signal of the radio detection equipment after signal acquisition and preprocessing (including AD acquisition/DDC/extraction and the like);
s3, carrying out frequency discrimination and phase discrimination on the data, carrying out frequency measurement on the acquired data of the radio detection equipment to realize frequency locking processing, then analyzing the phase of connected pulses to obtain inter-pulse phase information, and finally carrying out correlation processing on the inter-pulse phase information and a pre-stored local pseudo-random code to obtain initial position information of the random code;
s4, delaying the signal (according to the frequency and phase discrimination result, overlapping), and modulating the Doppler frequency and the amplitude to obtain a baseband target echo of the radio detection equipment;
s5, performing digital up-conversion and DA conversion on the baseband target echo to obtain low and intermediate frequency target echo signals of different channels;
and S6, obtaining a required radio frequency target echo signal after up-conversion and power adjustment.
6. A storage medium on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as claimed in claim 5.
7. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of claim 5.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388906A (en) * | 2023-04-23 | 2023-07-04 | 中国人民解放军火箭军工程大学 | 128 scattering point fuze echo generation method for semi-physical simulation |
| CN116430334A (en) * | 2023-06-13 | 2023-07-14 | 北京中科睿信科技有限公司 | Pseudo code phase modulation fuze target echo near simulation method, equipment and medium |
| CN118539945A (en) * | 2024-05-20 | 2024-08-23 | 广州斯达尔科技有限公司 | Very high frequency data chain simulator based on software radio |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388906A (en) * | 2023-04-23 | 2023-07-04 | 中国人民解放军火箭军工程大学 | 128 scattering point fuze echo generation method for semi-physical simulation |
| CN116430334A (en) * | 2023-06-13 | 2023-07-14 | 北京中科睿信科技有限公司 | Pseudo code phase modulation fuze target echo near simulation method, equipment and medium |
| CN116430334B (en) * | 2023-06-13 | 2023-08-15 | 北京中科睿信科技有限公司 | Pseudo code phase modulation fuze target echo near simulation method, equipment and medium |
| CN118539945A (en) * | 2024-05-20 | 2024-08-23 | 广州斯达尔科技有限公司 | Very high frequency data chain simulator based on software radio |
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