A method of cooperative jamming of radio fuze based on high-precision time synchronization system

Abstract

The present invention provides a radio fuze cooperative jamming method based on a high-precision timing system, including a Beidou / GPS module, an MCU+FPGA module, a phase-locked module, a frequency division circuit, a driving module, an NTP output module, and an IRIG‑B output module. The cooperative jamming method is to first deploy each jamming vehicle at a designated location, and perform reconnaissance jamming timing calibration through the high-precision timing system on each jamming vehicle; after each jamming vehicle completes a reconnaissance jamming action, a time synchronization calibration is performed to ensure real-time timing synchronization between each vehicle; after each target signal is detected, the detected target signal information is stored in real time, and the information is recorded at the time. The present invention proposes a large-bandwidth radio fuze jamming method, completes the timing synchronization operation of reconnaissance jamming of multiple jamming vehicles, and uses a high-precision timing synchronization method to control the error time of the timing synchronization of each jamming vehicle within 20ns, thereby realizing multi-vehicle cooperative jamming of new-system radio fuze signals.

Description

Technical Field

[0001] The invention belongs to the technical field of radio fuzes, and in particular relates to a radio fuze cooperative interference method based on a high-precision time synchronization system. Background Art

[0002] Traditional radio fuze signals have a single frequency and pulse pattern. A self-defense jammer can effectively interfere with radio fuzes. With the development of semiconductor chips and the advancement of radio detection technology, the detection distance, accuracy, and anti-interference ability of radio fuzes have been significantly improved. The instantaneous bandwidth of the signal is getting wider and wider, and the pulse waveform pattern is becoming more and more complex. Traditional analog jammers can no longer adapt to the monitoring of broadband radar signals. The frequency-hopping radio fuze based on the pseudo-code phase modulation system has been widely used in the design of radio fuzes due to its wide instantaneous bandwidth, high interception probability, high sensitivity, large dynamic range, and strong processing capability.

[0003] In the process of implementing electronic jamming on radio fuses, since the reconnaissance receiving antenna and the jamming transmitting antenna are arranged on the same vehicle, the isolation between the receiving antenna and the transmitting antenna is greatly enhanced by measures such as adding a shielding cover to the antenna side lobe. However, considering factors such as the high sensitivity of the reconnaissance receiving antenna and the high gain of the jamming transmitting antenna, there is still the possibility that the reconnaissance and jamming equipment may interfere with each other.

[0004] The frequency-hopping radio fuze based on the pseudo-code phase modulation system has a wide instantaneous bandwidth, high interception probability, high sensitivity, large dynamic range, and strong processing capability. It is often necessary to use multiple jammers to work together to synchronize the fuze from different angles and dimensions. Due to factors such as the relative position of the jammers and the sensitivity of the reconnaissance equipment receiver, there may be mutual interference between the vehicles.

[0005] Based on this, a radio fuze cooperative jamming method based on a high-precision time synchronization system is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a radio fuse cooperative interference method based on a high-precision time system in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a radio fuse coordinated interference method based on a high-precision time system, wherein the high-precision time system includes a Beidou / GPS module, an MCU+FPGA module, a phase-locked module, a frequency division circuit, a drive module, an NTP output module and an IRIG-B output module;

[0008] Among them, the positioning accuracy of the time synchronization satellite receiver equipped with the Beidou / GPS module is 1.8m, and the positioning information of the time synchronization satellite receiver equipped with the Beidou / GPS module is output to the MCU+FPGA module through the RS232 port at a frequency of 10Hz, and the MCU+FPGA module 2 signal is connected to the clock face / status display module;

[0009] The 1pps synchronous trigger pulse signal processed in the MCU+FPGA module is outputted through the phase-locked module, the frequency division circuit and the drive module in sequence;

[0010] The time information with an accuracy of 10us processed in the MCU+FPGA module is output through the NTP output module;

[0011] The time information of the year, month, and day processed in the MCU+FPGA module is outputted with an accuracy of 20ns through the IRIG-B output module;

[0012] The time information with an accuracy of 50ms processed in the MCU+FPGA module is directly output via RS232 / RS422;

[0013] The collaborative interference method includes: first deploying each jamming vehicle at a designated location, and performing reconnaissance jamming timing calibration through a high-precision timing system on each jamming vehicle; performing a time synchronization calibration after each jamming vehicle completes a reconnaissance jamming action to ensure real-time timing synchronization between each vehicle; after each target signal is detected, the detected target signal information is stored in real time, and the information time is recorded to facilitate post-test review.

[0014] Furthermore, the time synchronization satellite receiver can generate a 1pps synchronization pulse with a synchronization error of less than 50ns with the UTC time.

[0015] Furthermore, the NTP time synchronization accuracy of the NTP output module is 10ms.

[0016] Furthermore, the IRIG timing accuracy of the IRIG-B output module is 100ns.

[0017] Furthermore, the phase-locked module includes a phase-locked loop, a 10MHz rubidium clock, a phase-locked circuit and a crystal oscillator. When the GPS receiver captures a satellite signal, the MCU+FPGA module tames the timing frequency standard and uses the timing pulse 1pps of the receiver as a reference standard, and compares the phase with the 1pps obtained by frequency division of the 10MHz rubidium clock output. The phase difference is measured using a related processor, and the phase error data is converted into voltage-controlled voltage data of the crystal oscillator through digital filtering of the phase-locked circuit, and transmitted to the crystal oscillator to complete the frequency fine-tuning of the crystal oscillator, thereby ensuring that the 10MHz rubidium clock output signal has excellent long and short stability characteristics and accuracy.

[0018] Furthermore, the frequency maintenance accuracy of the rubidium clock for 24 hours is 15us, the synchronization error after the rubidium clock is synchronously locked is 20ns, and the short-term frequency stability of the rubidium clock is 510-12 (1s).

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention proposes a jamming method for a new-system large-bandwidth radio fuze, which completes the timing synchronization operation of reconnaissance jamming of multiple jamming vehicles. By using a high-precision time synchronization method, the error time of the timing synchronization of each jamming vehicle is controlled within 20ns, thereby realizing multi-vehicle coordinated jamming of the new-system radio fuze signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall principle framework diagram of the present invention.

[0022] Description of reference numerals:

[0023] 1-Beidou / GPS module; 2-MCU+FPGA module; 3-Phase-locked module; 4-Frequency division circuit; 5-Drive module; 6-IRIG-B output module; 7-NTP output module. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the present invention provides a technical solution: a radio fuse coordinated interference method based on a high-precision time system, wherein the high-precision time system includes a Beidou / GPS module 1, an MCU+FPGA module 2, a phase-locked module 3, a frequency division circuit 4, a drive module 5, an NTP output module 7, and an IRIG-B output module 8;

[0026] Among them, the positioning accuracy of the time synchronization satellite receiver equipped with the Beidou / GPS module 1 is 1.8m, and the positioning information of the time synchronization satellite receiver equipped with the Beidou / GPS module 1 is output to the MCU+FPGA module 2 through the RS232 port at a frequency of 10Hz, and the MCU+FPGA module 2 signal is connected to the clock face / status display module;

[0027] The 1pps synchronous trigger pulse signal processed in the MCU+FPGA module 2 is outputted through the phase-locked module 3, the frequency division circuit 4 and the driving module 5 in sequence;

[0028] The time information with an accuracy of 10us processed in the MCU+FPGA module 2 is output through the NTP output module 7;

[0029] The time information of the year, month, and day processed in the MCU+FPGA module 2 is outputted with an accuracy of 20ns via the IRIG-B output module 8;

[0030] The time information with an accuracy of 50ms processed in the MCU+FPGA module 2 is directly output via RS232 / RS422;

[0031] The collaborative interference method includes: first deploying each jamming vehicle at a designated location, and performing reconnaissance jamming timing calibration through a high-precision timing system on each jamming vehicle; performing a time synchronization calibration after each jamming vehicle completes a reconnaissance jamming action to ensure real-time timing synchronization between each vehicle; after each target signal is detected, the detected target signal information is stored in real time, and the information time is recorded to facilitate post-test review.

[0032] The time synchronization satellite receiver can generate a 1pps synchronization pulse with a synchronization error of less than 50ns with the UTC time.

[0033] The NTP time synchronization accuracy of the NTP output module 7 is 10ms.

[0034] The IRIG timing accuracy of the IRIG-B output module 8 is 100ns.

[0035] The phase-locked module 3 includes a phase-locked loop, a 10MHz rubidium clock, a phase-locked circuit and a crystal oscillator. When the GPS receiver captures the satellite signal, the MCU+FPGA module 2 tames the timing frequency standard and uses the timing pulse 1pps of the receiver as the reference standard, and compares the phase with the 1pps obtained by frequency division of the 10MHz rubidium clock output. The phase difference is measured using a related processor, and the phase error data is converted into voltage-controlled voltage data of the crystal oscillator through digital filtering of the phase-locked circuit, and transmitted to the crystal oscillator to complete the frequency fine-tuning of the crystal oscillator, thereby ensuring that the 10MHz rubidium clock output signal has excellent long and short stability characteristics and accuracy.

[0036] The rubidium clock has a 24-hour frequency maintenance accuracy of 15us, a synchronization error of 20ns after the rubidium clock is synchronously locked, and a short-term frequency stability of 510-12 (1s).

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radio fuze cooperative jamming method based on a high-precision time synchronization system, characterized in that: The high-precision time system comprises a Beidou / GPS module (1), an MCU+FPGA module (2), a phase-locked module (3), a frequency division circuit (4), a drive module (5), an NTP output module (7), and an IRIG-B output module (8); The positioning accuracy of the time synchronization satellite receiver equipped with the Beidou / GPS module (1) is 1.8 m, and the positioning information of the time synchronization satellite receiver equipped with the Beidou / GPS module (1) is output to the MCU+FPGA module (2) through the RS232 port at a frequency of 10 Hz, and the MCU+FPGA module (2) is signal-connected to a clock face / status display module; The 1 pps synchronous trigger pulse signal processed in the MCU+FPGA module (2) is output in sequence through the phase-locked module (3), the frequency division circuit (4) and the drive module (5); The time information with an accuracy of 10us processed in the MCU+FPGA module (2) is output via the NTP output module (7); The time information of the year, month and day processed in the MCU+FPGA module (2) is outputted with an accuracy of 20 ns via an IRIG-B output module (8); The time information with an accuracy of 50 ms processed in the MCU+FPGA module (2) is directly output via RS232 / RS422; The collaborative interference method includes: first deploying each jamming vehicle at a designated location, and performing reconnaissance jamming timing calibration through a high-precision timing system on each jamming vehicle; performing a time synchronization calibration after each jamming vehicle completes a reconnaissance jamming action to ensure real-time timing synchronization between the vehicles; after each target signal is detected, the detected target signal information is stored in real time, and the time of the information is recorded to facilitate post-test review.

2. The radio fuse cooperative jamming method based on the high-precision time synchronization system according to claim 1 is characterized in that: The time synchronization satellite receiver can generate a 1pps synchronization pulse with a synchronization error of less than 50ns with the UTC time.

3. The radio fuse cooperative jamming method based on a high-precision time synchronization system according to claim 1 is characterized in that: The NTP time synchronization accuracy of the NTP output module (7) is 10 ms.

4. The radio fuse cooperative jamming method based on a high-precision time synchronization system according to claim 1 is characterized in that: The IRIG timing accuracy of the IRIG-B output module (8) is 100 ns.

5. The radio fuse cooperative jamming method based on a high-precision time synchronization system according to claim 1 is characterized in that: The phase-locked module (3) comprises a phase-locked loop, a 10 MHz rubidium clock, a phase-locked circuit and a crystal oscillator. When the GPS receiver captures a satellite signal, the MCU+FPGA module (2) tames the timing frequency standard and uses the timing pulse 1 pps of the receiver as a reference standard, and compares the phase with the 1 pps obtained by frequency division of the 10 MHz rubidium clock output. The phase difference is measured by a related processor, and the phase error data is converted into voltage-controlled voltage data of the crystal oscillator through digital filtering of the phase-locked circuit, and transmitted to the crystal oscillator to complete the frequency fine-tuning of the crystal oscillator, thereby ensuring that the 10 MHz rubidium clock output signal has excellent long and short stability characteristics and accuracy.

6. The radio fuse cooperative jamming method based on the high-precision time synchronization system according to claim 5 is characterized in that: The rubidium clock has a 24-hour frequency maintenance accuracy of 15us, a synchronization error of 20ns after the rubidium clock is synchronously locked, and a short-term frequency stability of 510-12 (1s).

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