CN113433517B - Protection system and method for complex waveform radar radio frequency echo simulation - Google Patents

Protection system and method for complex waveform radar radio frequency echo simulation Download PDF

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Publication number
CN113433517B
CN113433517B CN202110702525.XA CN202110702525A CN113433517B CN 113433517 B CN113433517 B CN 113433517B CN 202110702525 A CN202110702525 A CN 202110702525A CN 113433517 B CN113433517 B CN 113433517B
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radar
digital
stored
signals
protection
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CN113433517A (en
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兰慧
刘冬利
邵晓方
谭安胜
李家森
程占昕
刘江
张新宇
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PLA Dalian Naval Academy
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PLA Dalian Naval Academy
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40Means for monitoring or calibrating
    • G01S7/4052Means for monitoring or calibrating by simulation of echoes

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a protection system and a method for simulating complex waveform radar radio frequency echo, wherein the system comprises the following components: the device comprises a digital frequency storage protection time calculation module, a pulse width measurement module and a digital frequency storage protection module; the digital frequency storage protection time calculation module is used for obtaining the protection time of radar signals with different waveforms according to the corresponding relation between the width of the complex-waveform radar and the detection distance range; the pulse width measuring module obtains a radar signal to be stored by measuring the pulse width of the radar signal to be measured, and obtains the protection time of the radar signal to be stored; the digital frequency storage protection module is used for carrying out digital signal storage on the radar signals to be stored and obtaining radar radio frequency echo analog signals; and performing storage protection on the digital stored frequency based on the protection time of the radar signal to be stored. According to the invention, the probability of false triggering is effectively reduced by avoiding that other pulse signals trigger the storage of digital stored frequency again in the minimum repetition period.

Description

Protection system and method for complex waveform radar radio frequency echo simulation
Technical Field
The invention relates to the technical field of complex waveform radar radio frequency echo simulation, in particular to a system and a method for protecting complex waveform radar radio frequency echo simulation.
Background
When the DRFM technology is used for carrying out echo simulation on the radar, the storage of the DRFM is mainly triggered by the received radar pulse detection signal. In practical use, the digital frequency storage unit usually works in a complex electromagnetic environment, for example, when the analog device is used at a wharf, a plurality of other radars are arranged on a ship, the radars with the same or intersected working frequency bands as the radars to be simulated are also arranged on other ships, at the moment, the synchronous pulse generating circuit of the echo analog device can output synchronous signals according to pulse signals of the other radars, and if the radar signals are still stored in an original triggering and storing mode, the correct radar signals originally stored by the digital frequency storage unit can be covered by signals of the other radars when the digital frequency storage unit does not come to transmit. Therefore, in order to avoid the storage of the triggering of the non-current tested radar radiation signal, the invention provides a protection method for the radio frequency echo simulation of the complex waveform radar.
Disclosure of Invention
Aiming at the problems, the invention provides a protection system and a method for simulating the radio frequency echo of the complex waveform radar, which are used for solving the technical problems in the prior art, and can effectively reduce the probability of false triggering by avoiding that other pulse signals trigger the storage of digital stored frequency again in the minimum repetition period.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a protection system for simulating complex waveform radar radio frequency echo, which comprises: the device comprises a digital frequency storage protection time calculation module, a pulse width measurement module and a digital frequency storage protection module;
the digital frequency storage protection time calculation module is used for obtaining the protection time of radar signals with different waveforms according to the corresponding relation between the width of the complex-waveform radar and the detection distance range;
the pulse width measuring module obtains the radar signals to be stored by measuring the pulse width of the radar signals to be measured, and obtains the protection time of the radar signals to be stored based on the protection time of the radar signals with different waveforms;
the digital frequency storage protection module is used for storing the radar signals to be stored into digital signals; the digital frequency storage protection module is used for carrying out storage protection on the digital frequency storage based on the protection time of the radar signal to be stored, and the stored digital signal is used for obtaining a radar radio frequency echo analog signal.
Preferably, the digital frequency storage protection time calculation module comprises a digital frequency storage time calculation unit and a conversion unit; the digital frequency storage time calculation unit is connected with the conversion unit and the pulse width measurement module in sequence;
the digital signal processing unit is used for obtaining the minimum repetition period of the radar with different waveforms, namely the protection time of the radar signals with different waveforms according to the corresponding relation between the width of the radar with the complex waveform and the detection distance range;
the conversion unit is used for converting the protection time of the radar signals with different waveforms into digital signals.
Preferably, the digital frequency storage protection module is also connected with an echo simulation module; the echo simulation module obtains a radar radio frequency echo simulation signal based on the stored digital signal.
Preferably, the digital frequency storage protection time calculation module adopts a DSP digital signal processor.
Preferably, the pulse width measurement module comprises a radar signal storage judgment unit and a screening unit; the radar signal storage judging unit is respectively connected with the converting unit and the screening unit; the screening unit is connected with the digital frequency storage and storage protection module;
the radar signal storage judging unit is used for carrying out pulse width measurement on the video pulse output by the synchronous pulse generating circuit to obtain a signal pulse width, and judging whether the pulse is a radar signal to be stored or not according to the pulse width;
the screening unit is used for screening out the protection time of the radar signals with corresponding waveforms in the digital frequency storage protection time calculation module according to the radar signals to be stored.
Preferably, the pulse width measurement module adopts an FPGA.
Preferably, the digital frequency storage protection time calculation module is also connected with an upper computer; the upper computer is used for collecting the corresponding relation between the width of the complex waveform radar and the detection distance range.
The invention also provides a protection method for the complex waveform radar radio frequency echo simulation, which comprises the following steps:
s1, obtaining the protection time of radar signals with different waveforms by obtaining the minimum repetition period of the radar with different waveforms;
s2, measuring pulse width of a radar signal to be measured, obtaining the radar signal to be stored, and obtaining the protection time of the radar signal to be stored based on the protection time of the radar signals with different waveforms;
s3, storing the radar signals to be stored in digital signals to finish storage protection; and the stored digital signals are used for simulating radar radio frequency echo signals.
Preferably, the specific acquisition process of the minimum repetition period of the complex waveform radar is as follows: and measuring the detection distance corresponding to the pulse width of the complex waveform radar, and obtaining the minimum repetition period of different radar waveform pulses according to the range of the detection distance.
The invention discloses the following technical effects:
according to the invention, the minimum repetition period of radar signals can be obtained according to the pulse width and the detection distance range of the radar, so that after DRFM storage is finished, other pulse signals can not trigger storage of digital stored frequency again in the minimum repetition period under the waveform, and the probability of false triggering is effectively reduced; the problem that the original stored correct radar signal is lost due to the fact that the digital frequency storage unit is triggered and stored by other interference signals under the complex electromagnetic environment is solved, and the accuracy of echo simulation can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a system according to the present invention;
FIG. 2 is a schematic diagram of a pulse width measurement module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a digital frequency storage protection module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an echo module in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-4, the present embodiment provides a protection system for complex waveform radar radio frequency echo simulation, including: the device comprises a digital frequency storage protection time calculation module, a pulse width measurement module and a digital frequency storage protection module.
The digital frequency storage protection time calculation module is used for obtaining the protection time of radar signals with different waveforms according to the corresponding relation between the width of the complex-waveform radar and the detection distance range.
The digital frequency storage protection time calculation module comprises a digital frequency storage time calculation unit and a conversion unit. The digital signal processing unit is used for obtaining the minimum repetition period of the radar with different waveforms, namely the protection time of the radar signals with different waveforms according to the corresponding relation between the width of the radar with the complex waveform and the detection distance range; the conversion unit is used for converting the protection time of the radar signals with different waveforms into digital signals. The digital frequency storage protection time calculation module adopts a DSP digital signal processor.
The specific connection relation of the digital frequency storage protection time calculation module is as follows: the digital frequency storage time calculation unit is connected with the conversion unit and the pulse width measurement module in sequence; the digital frequency storage protection module is also connected with an echo simulation module; and the echo simulation module obtains a radar radio frequency echo simulation signal based on the stored digital signal.
The digital frequency storage protection time calculation module comprises the following specific working processes: the module sends various pulse widths of the complex waveform radar and detection distances corresponding to the pulse widths to the DSP through the serial port by the upper computer, and the DSP obtains the minimum repetition period of the waveform pulse according to the detection distance range, converts the minimum repetition period into the clock number of the FPGA and sends the clock number to the FPGA.
The pulse width measuring module obtains the radar signals to be stored by measuring the pulse width of the radar signals to be measured, and obtains the protection time of the radar signals to be stored based on the protection time of the radar signals with different waveforms.
The pulse width measurement module comprises a radar signal storage judging unit and a screening unit; the radar signal storage judging unit is used for carrying out pulse width measurement on the video pulse output by the synchronous pulse generating circuit to obtain a signal pulse width, and judging whether the pulse is a radar signal to be stored or not according to the pulse width; the screening unit is used for screening out the protection time of the radar signals with corresponding waveforms in the digital frequency storage protection time calculation module according to the radar signals which are stored as required. The pulse width measuring module adopts an FPGA.
The specific connection relation of the pulse width measuring module is as follows: the radar signal storage judging unit is respectively connected with the converting unit and the screening unit; the screening unit is connected with the digital frequency storage and storage protection module.
The specific working process of the pulse width measuring module is as follows: starting a counter module after receiving a video pulse signal, counting when the signal is high, and latching a counting result when the signal is low from high to low to obtain the pulse width; firstly judging whether the signal needs to be forwarded in a delayed mode to form an echo according to the width combined with an echo analog pulse width range sent by an upper computer, and if not, waiting for the next signal; if yes, the time needed to be protected for the signal is obtained by combining the width with the digital frequency storage protection time calculation module and is sent to the digital frequency storage protection module.
The digital frequency storage protection module is used for storing the radar signals to be stored into digital signals; the digital frequency storage protection module is used for carrying out storage protection on the digital frequency storage based on the protection time of the radar signal to be stored, and the stored digital signal is used for obtaining the radar radio frequency echo analog signal.
The digital frequency storage protection time calculation module is also connected with an upper computer; the upper computer is used for acquiring the corresponding relation between the width of the complex waveform radar and the detection distance range; the digital frequency storage adopts a DRFM digital radio frequency storage.
The specific working process of the digital frequency storage and storage protection module is as follows: when the received signal belongs to the correct radar radiation signal to be tested, the counter starts counting at the rising edge of the detection signal to generate a control high level, so that the video pulse output by the synchronous pulse generating circuit is ensured not to trigger pulse width measurement and storage of the memory, and the maximum count value of the counter is determined by the protection time calculating module according to the pulse width parameter output by the pulse width measuring module. When the protection time is up, the protection is released, and the output of the synchronous pulse generating circuit can trigger the pulse width measurement and the storage of the memory again. After the DRFM finishes storing the tested radar radiation signals, the storage module is controlled to hide the arrived storage trigger signals in the protection time according to the corresponding protection time, and the DRFM does not store any more.
The embodiment provides a protection method for complex waveform radar radio frequency echo simulation, which comprises the following steps:
s1, obtaining the protection time of radar signals with different waveforms by obtaining the minimum repetition period of the radar with different waveforms.
The specific acquisition process of the minimum repetition period of the complex waveform radar comprises the following steps: and measuring the detection distance corresponding to the pulse width of the complex waveform radar, and obtaining the minimum repetition period of different radar waveform pulses according to the range of the detection distance.
S2, measuring pulse width of the radar signal to be measured, obtaining the radar signal to be stored, and obtaining the protection time of the radar signal to be stored based on the protection time of the radar signals with different waveforms.
S3, storing digital signals of the radar signals to be stored, and completing storage protection; the method comprises the steps of storing a radar signal to be stored only once in a protection time of the radar signal to be stored, wherein the stored digital signal is used for simulating a radar radio frequency echo signal. The specific simulation process of the radar radio frequency echo signal is as follows: according to the target setting of the upper computer, the stored digital signals are read out from the memory after the delay is set, and are converted into radar analog echo radio frequency signals after the distance modulation through up-conversion.
The invention discloses the following technical effects:
according to the invention, the minimum repetition period of radar signals can be obtained according to the pulse width and the detection distance range of the radar, so that after DRFM storage is finished, other pulse signals can not trigger storage of digital stored frequency again in the minimum repetition period under the waveform, and the probability of false triggering is effectively reduced; the problem that the original stored correct radar signal is lost due to the fact that the digital frequency storage unit is triggered and stored by other interference signals under the complex electromagnetic environment is solved, and the accuracy of echo simulation can be effectively improved.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the corresponding technical solutions. Are intended to be encompassed within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A protection system for complex waveform radar radio frequency echo simulation, comprising: the device comprises a digital frequency storage protection time calculation module, a pulse width measurement module and a digital frequency storage protection module;
the digital frequency storage protection time calculation module is used for obtaining the protection time of radar signals with different waveforms according to the corresponding relation between the width of the complex-waveform radar and the detection distance range;
the digital frequency storage protection time calculation module comprises a digital frequency storage time calculation unit and a conversion unit; the digital frequency storage time calculation unit is connected with the conversion unit and the pulse width measurement module in sequence;
the digital frequency storage time calculation unit is used for obtaining the minimum repetition period of the radar with different waveforms, namely the protection time of the radar signals with different waveforms according to the corresponding relation between the width of the radar with the complex waveform and the detection distance range;
the conversion unit is used for converting the protection time of the radar signals with different waveforms into digital signals;
the pulse width measuring module obtains the radar signals to be stored by measuring the pulse width of the radar signals to be measured, and obtains the protection time of the radar signals to be stored based on the protection time of the radar signals with different waveforms;
the digital frequency storage protection module is used for storing the radar signals to be stored into digital signals; the digital frequency storage protection module is used for carrying out storage protection on the digital frequency storage based on the protection time of the radar signal to be stored, and the stored digital signal is used for obtaining a radar radio frequency echo analog signal.
2. The protection system for complex waveform radar radio frequency echo simulation according to claim 1, wherein the digital frequency storage protection module is further connected with an echo simulation module; the echo simulation module obtains a radar radio frequency echo simulation signal based on the stored digital signal.
3. The system for protecting complex waveform radar radio frequency echo simulation according to claim 1, wherein the digital stored frequency guard time calculation module employs a DSP digital signal processor.
4. The protection system for complex waveform radar radio frequency echo simulation according to claim 3, wherein the pulse width measurement module comprises a radar signal storage judgment unit and a screening unit; the radar signal storage judging unit is respectively connected with the converting unit and the screening unit; the screening unit is connected with the digital frequency storage and storage protection module;
the radar signal storage judging unit is used for carrying out pulse width measurement on the video pulse output by the synchronous pulse generating circuit to obtain a signal pulse width, and judging whether the pulse is a radar signal to be stored or not according to the pulse width;
the screening unit is used for screening out the protection time of the radar signals with corresponding waveforms in the digital frequency storage protection time calculation module according to the radar signals to be stored.
5. The system for protecting complex waveform radar radio frequency echo simulation of claim 4, wherein the pulse width measurement module employs an FPGA.
6. The protection system for simulating the radio frequency echo of the complex waveform radar according to claim 1, wherein the digital frequency storage protection time calculation module is further connected with an upper computer; the upper computer is used for collecting the corresponding relation between the width of the complex waveform radar and the detection distance range.
7. The method for protecting the complex waveform radar radio frequency echo simulation is characterized by comprising the following steps of:
s1, obtaining the protection time of radar signals with different waveforms by obtaining the minimum repetition period of the radar with different waveforms;
the specific acquisition process of the minimum repetition period of the complex waveform radar comprises the following steps: measuring a detection distance corresponding to the pulse width of the complex waveform radar, and obtaining the minimum repetition period of different radar waveform pulses according to the range of the detection distance;
s2, measuring pulse width of a radar signal to be measured, obtaining the radar signal to be stored, and obtaining the protection time of the radar signal to be stored based on the protection time of the radar signals with different waveforms;
s3, storing the radar signals to be stored in digital signals to finish storage protection; and the stored digital signals are used for simulating radar radio frequency echo signals.
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