Radar interference and secure communication integrated system based on photonics

Abstract

The invention discloses a radar interference and safety communication integrated system based on photonics, which comprises an optical signal generation unit, an arbitrary waveform generator module, a signal integrated processing unit and a signal transmission unit, and is characterized in that the optical signal generation unit is used for generating carrier suppression double-sideband optical signals; the arbitrary waveform generator module is used for generating a driving signal for driving the in-phase quadrature modulator module, and the driving signal comprises an encrypted OFDM signal and an LFM signal for radar interference; the signal integrated processing unit is used for combining the driving signal and the carrier suppression double-sideband optical signal, and generating and outputting an integrated optical signal; and the signal transmission unit is used for converting the optical signal into an electric signal to realize signal transmission. According to the technical scheme, radar interference and safe communication can be achieved in the same transmission system at the same time, and due to photon transmission, the transmission system is wide in bandwidth, low in loss and high in anti-electromagnetic interference capacity.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a radar jamming and security communication integrated system based on photonics. Background Art

[0002] With the rapid development of electronic warfare technology, people have developed many radar jamming technologies to prevent targets from being detected, and have also proposed some secure communication technologies to prevent transmitted communication signals from being eavesdropped. These two technologies have been developed independently in the past few decades. Synaesthesia integration makes the combination of the two possible. Integrating radar jamming and secure communication has the advantages of improving hardware and frequency band utilization while minimizing power consumption. However, in the traditional electronics field, the integration of radar jamming and secure communication systems faces huge challenges due to limited operating bandwidth, large transmission loss, and sensitivity to electromagnetic interference.

[0003] Among them, deception jamming is a popular research direction in radar jamming technology, and frequency shift jamming is an important technology of deception jamming. Frequency shift jamming is to install a frequency converter in the target to change the frequency of the received radar signal and return it to the enemy radar, causing the enemy radar to receive wrong information and achieve deception jamming of distance or speed. However, the frequency shift jamming system currently proposed has disadvantages such as low conversion efficiency and poor tunability, and cannot integrate secure communication functions. In the field of secure communication, the physical layer encryption scheme operating at the communication channel level provides basic security guarantees for the communication system. Among them, the physical layer security encryption scheme based on digital chaos encryption is currently considered to be one of the most promising methods. This is mainly due to the fact that it does not require complex hardware system support, thus providing advantages in cost-effectiveness and reduced complexity. Many digital chaos encryption schemes have also been applied to high-speed optical and wireless communications, showing a high level of secure communication performance. However, the current secure communication systems based on digital chaos encryption cannot integrate the ability of radar jamming.

[0004] Therefore, a technical solution is needed to achieve integrated synaesthesia, which has wide bandwidth, low loss, strong anti-electromagnetic interference capability, and can also achieve radar interference and secure communication at the same time. Summary of the invention

[0005] To achieve the above-mentioned purpose, the present application provides a radar jamming and security communication integrated system based on photonics, comprising: an optical signal generating unit, an arbitrary waveform generator module (130), a signal integration processing unit and a signal transmission unit, wherein:

[0006] The optical signal generating unit is used for generating a suppressed carrier double sideband optical signal;

[0007] The arbitrary waveform generator module (130) is used to generate a driving signal for driving the in-phase orthogonal modulator module, including an encrypted OFDM signal and an LFM signal for radar jamming;

[0008] The signal integration processing unit is used to combine the driving signal and the suppressed carrier double-sideband optical signal to generate and output an integrated optical signal;

[0009] The signal transmission unit is used to convert the optical signal into an electrical signal to achieve signal transmission.

[0010] The signal integrated processing unit comprises: an I / Q modulation module (140), a wavelength selection switch (120), a dual-parallel dual-drive Mach-Zehnder modulator module (150), a waveform generator (160) and an optical coupling module (170);

[0011] The wavelength selection switch (120) is used to divide the suppressed carrier double-sideband optical signal into a lower sideband optical signal and an upper sideband optical signal; the upper sideband optical signal is sent to the I / Q modulation module (140), and the lower sideband optical signal is sent to a dual-parallel dual-drive Mach-Zehnder modulator module (150);

[0012] The optical coupling module (170) is used to combine the output signals of the I / Q modulation module (140) and the dual-parallel dual-drive Mach-Zehnder modulator module (150) to output an integrated optical signal.

[0013] Among them, after the upper sideband optical signal is sent to the I / Q modulation module, the encrypted OFDM signal and the LFM signal drive the I / Q modulation module to generate a digital chaotic encrypted OFDM signal based on the constellation shift method.

[0014] The waveform generator (160) is used to perform frequency deviation processing on the lower sideband optical signal.

[0015] Furthermore, the frequency deviation processing means that the waveform generator (160) generates two sine waves, and when the dual-parallel dual-drive Mach-Zehnder modulator unit (150) reaches its maximum transmission efficiency, it is driven by the two sine waves to realize the function of the optical phase modulator.

[0016] The signal transmission unit comprises a photodiode module (180) and a horn antenna module (190);

[0017] The photodiode module (180) is used to assist the beat frequency and generate a frequency-shifted millimeter wave signal I(t);

[0018] The horn antenna module (190) propagates the frequency-shifted millimeter wave signal I(t) into free space for transmission.

[0019] Furthermore, the optical signal generating unit is composed of a microwave generator and a Mach-Zehnder modulator (110), wherein the Mach-Zehnder modulator (110) is driven by a single-tone radio frequency signal generated by the microwave generator and is biased at a minimum transmission point.

[0020] According to the present invention, radar jamming and secure communication can be realized simultaneously in the same transmission system, and because it is based on photon transmission, the transmission system of the present invention has a wide bandwidth, low loss, and strong anti-electromagnetic interference capability. Specifically, in terms of radar jamming, a dual-parallel dual-drive Mach-Zehnder modulator is used to realize Serrodyne modulation to achieve the purpose of speed deception jamming and distance deception jamming; in terms of secure communication, an I / Q modulator driven by a digital chaotic encrypted OFDM signal and an LFM signal based on frequency division multiplexing is used to realize the transmission of chaotic encrypted OFDM signals. After these two signals are coupled by an optical coupler, a Ka-band chaotic encrypted OFDM signal and a radar jamming signal are simultaneously generated at the output end of the photodiode. This topological structure can realize radar jamming and secure communication at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic diagram of the structure of a radar jamming and secure communication integrated system based on photonics provided according to an embodiment of the present invention; reference numerals: 110 - Mach-Zehnder module, 120 - wavelength selective switch module, 130 - arbitrary waveform generator module, 140 - I / Q module, 150 - dual-parallel dual-drive Mach-Zehnder modulator, 160 - waveform generator module, 170 - optical coupling module, 180 - photodiode module, 190 - horn antenna module. DETAILED DESCRIPTION

[0022] This invention proposes a new integrated system of radar jamming and secure communications based on photonics

[0023] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the photonics-based radar jamming and security communication integrated system proposed by the present invention comprises: an optical signal generating unit, an arbitrary waveform generator module (130), a signal integration processing unit and a signal transmission unit, wherein:

[0025] 1) The optical signal generating unit is used to generate a suppressed carrier double-sideband optical signal;

[0026] In the present invention, a microwave generator is used to generate a single-tone radio frequency signal LD ​​to drive a Mach-Zehnder module (110), so that the Mach-Zehnder module (110) operates at a minimum transmission point to generate a suppressed carrier double-sideband optical signal E MZM (t);

[0027] In the present invention, signal transmission is performed through optical signals, so compared with traditional electrical solutions, it has the advantages of wide bandwidth, low loss, and strong anti-electromagnetic interference capability.

[0028] 2) The arbitrary waveform generator module (130) is used to generate a driving signal L(t) for driving an in-phase orthogonal modulator module (I / Q modulation module), including an encrypted OFDM signal and an LFM signal for radar jamming;

[0029] 3) A signal integration processing unit is used to combine the driving signal with the suppressed carrier double-sideband optical signal to generate and output an integrated optical signal;

[0030] Specifically, the signal integration processing unit comprises: an I / Q modulation module (140), a wavelength selection switch (120), a dual-parallel dual-drive Mach-Zehnder modulator module (150), a waveform generator (160) and an optical coupling module (170);

[0031] When signal integrated processing is realized, firstly, a wavelength selection switch (120) is used to separate the suppressed carrier double-sideband optical signal into a lower sideband optical signal USB and an upper sideband optical signal LSB; the upper sideband optical signal is sent to the I / Q modulation module (140), and the lower sideband optical signal is sent to the dual-parallel dual-drive Mach-Zehnder modulator module (150);

[0032] Among them, the upper sideband optical signal is used to achieve secure communication: the arbitrary waveform generator module generates OFDM signals and LFM signals based on frequency division multiplexing digital chaos encryption. This signal drives the I / Q modulation module in the signal integration processing unit to generate digital chaos encryption OFDM signals E based on the constellation shift method. I / Q (t), realize the transmission of chaotic encrypted OFDM signals;

[0033] On the other hand, the lower sideband optical signal realizes radar interference. Specifically, a dual parallel dual-drive Mach-Zehnder modulator is used to realize Serrodyne modulation to generate E DDMZM (t), to achieve the purpose of speed deception interference and distance deception interference:

[0034] Specifically, the waveform generator (160) is used to perform frequency deviation processing on the lower sideband optical signal; the frequency deviation processing means that the waveform generator (160) generates two sine waves, and when the dual-parallel dual-drive Mach-Zehnder modulator unit (150) reaches its maximum transmission efficiency, it is driven by the two sine waves to realize the function of the optical phase modulator.

[0035] The optical coupling module (170) is used to combine the output signals of the I / Q modulation module (140) and the dual-parallel dual-drive Mach-Zehnder modulator module (150) to output an integrated optical signal.

[0036] 4) The signal transmission unit is used to convert the optical signal into an electrical signal to achieve signal transmission.

[0037] The signal transmission unit comprises a photodiode module (180) and a horn antenna module (190);

[0038] The photodiode module (180) assists in frequency beating and generates a frequency-shifted millimeter wave signal I(t), wherein the frequency-shifted millimeter wave signal I(t) includes a chaotic encrypted OFDM signal in the Ka band and a radar interference signal;

[0039] The horn antenna module (190) propagates the frequency-shifted millimeter wave signal I(t) into free space for transmission.

[0040] The present invention realizes radar jamming and secure communication in the same transmission system at the same time: in terms of radar jamming, a dual-parallel dual-drive Mach-Zehnder modulator is used to realize Serrodyne modulation to achieve the purpose of speed deception jamming and distance deception jamming; in terms of secure communication, an I / Q modulator driven by a digital chaotic encrypted OFDM signal and an LFM signal based on frequency division multiplexing is used to realize the transmission of chaotic encrypted OFDM signals. After the two signals are coupled by an optical coupler, a chaotic encrypted OFDM signal and a radar jamming signal of the Ka band are simultaneously generated at the output end of the photodiode. This topological structure can realize radar jamming and secure communication at the same time. On the other hand, since the present invention is based on photon transmission, its transmission system has a wide bandwidth, low loss, and strong anti-electromagnetic interference capability.

[0041] The above disclosures are only several specific embodiments of the present invention; however, the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A photonics-based radar jamming and security communication integrated system, characterized in that: include: An optical signal generating unit, an arbitrary waveform generator module (130), a signal integration processing unit and a signal transmission unit, wherein: The optical signal generating unit is used to generate a suppressed carrier double sideband optical signal; The arbitrary waveform generator module (130) is used to generate a driving signal for driving the in-phase orthogonal modulator module, including an encrypted OFDM signal and an LFM signal for radar interference; The signal integration processing unit is used to combine the driving signal with the suppressed carrier double-sideband optical signal to generate and output an integrated optical signal); The signal transmission unit is used to convert the optical signal into an electrical signal to achieve signal transmission.

2. The radar jamming and security communication integrated system according to claim 1, characterized in that: The signal integrated processing unit comprises: an I / Q modulation module (140), a wavelength selection switch (120), a dual-parallel dual-drive Mach-Zehnder modulator module (150), a waveform generator (160) and an optical coupling module (170); The wavelength selective switch (120) is used to divide the suppressed carrier double-sideband optical signal into a lower sideband optical signal and an upper sideband optical signal; the upper sideband optical signal is sent to the I / Q modulation module (140), and the lower sideband optical signal is sent to the dual-parallel dual-drive Mach-Zehnder modulator module (150); The optical coupling module (170) is used to combine the output signals of the I / Q modulation module (140) and the dual-parallel dual-drive Mach-Zehnder modulator module (150) to output an integrated optical signal.

3. The radar jamming and security communication integrated system according to claim 2, characterized in that: After the upper sideband optical signal is sent to the I / Q modulation module, the encrypted OFDM signal and the LFM signal drive the I / Q modulation module to generate a digital chaotic encrypted OFDM signal based on a constellation shift method.

4. The radar jamming and security communication integrated system according to claim 2, characterized in that: The waveform generator (160) is used to perform frequency deviation processing on the lower sideband optical signal.

5. The radar jamming and security communication integrated system according to claim 4, characterized in that: The frequency deviation processing means that the waveform generator (160) generates two sine waves, and when the dual-parallel dual-drive Mach-Zehnder modulator unit (150) reaches its maximum transmission efficiency, it is driven by the two sine waves to realize the function of an optical phase modulator.

6. The radar jamming and security communication integrated system according to claim 1, characterized in that: The signal transmission unit comprises a photodiode module (180) and a horn antenna module (190); The photodiode module (180) is used to assist the beat frequency and generate a frequency-shifted millimeter wave signal I(t); The horn antenna module (190) propagates the frequency-shifted millimeter wave signal I(t) into free space for transmission.

7. The radar jamming and security communication integrated system according to claim 1, characterized in that: The optical signal generating unit is composed of a microwave generator and a Mach-Zehnder modulator (110); the Mach-Zehnder modulator (110) is driven by a single-tone radio frequency signal generated by the microwave generator and is biased at a minimum transmission point.

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