Photoelectric detection data secure transmission method

Abstract

The invention provides a photoelectric detection data secure transmission method, and relates to the technical field of data communication, and the method comprises the following steps: obtaining a photoelectric data signal and a readable wavelength range; acquiring parameters between the photoelectric detection equipment and the relay point; modulating the data signal to obtain a modulated signal; the photoelectric detection equipment sends the modulation signal to a preset signal relay point, so that the wavelength of the modulation signal reaching the preset signal relay point after frequency offset is within a readable wavelength range; and the preset signal relay point encrypts the acquired signal and sends the encrypted signal to the acquisition center. Signal processing is simple, high-precision photoelectric signals can be processed, the photoelectric signals are effectively modulated through the characteristics of the photoelectric signals and the frequency deviation characteristics caused by relay satellite displacement, only the relay satellite can obtain the effective photoelectric signals, the high-performance relay satellite encrypts the effective photoelectric signals and transmits the effective photoelectric signals back to the ground, and the signal processing efficiency is improved. And the risk of signal interception leakage caused by insufficient encryption capability of the detection small satellite is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of data communication, and in particular, to a method for securely transmitting photoelectric detection data. Background Art

[0002] A photodetector is a device that detects light energy. The working principle of a general photodetector is based on the photoelectric effect, which is based on the fact that the material changes its electrical properties after absorbing light radiation energy, so that the existence of light and the amount of light energy can be detected. Semiconductor devices are increasingly being used in photodetectors.

[0003] Nowadays, photoelectric detection is widely used in various detection fields, especially in the field of visible light detection. This type of photoelectric detection instrument is very important. Common fields of photoelectric detection include deep (oil and gas) well detection, high-altitude detection, satellite reconnaissance, etc. Most of them are used in relatively open places, and the return of photoelectric detection data is also a long-distance transmission. Because the dynamic range and volume of the photoelectric detector directly determine the dynamic range and applicable scenarios of the instrument, it is almost impossible to rely solely on the photoelectric detector itself to return the photoelectric detection data. Therefore, a communication device is now electrically connected to the back of the photoelectric detector. After the communication device obtains the photoelectric detection data, it is packaged and then transmitted back to the receiving center, and then the receiving center unpacks it.

[0004] However, since most of the photoelectric detection data are highly sensitive, satellite detection data is a special case. First, the transmission signal has a long transmission distance, and the environment in the middle of the transmission is complex. It is extremely easy to be intercepted and obtained, resulting in data security leakage. There is an urgent need for safe transmission of high-precision and highly sensitive data; for example, Chinese patent invention patent CN114944864A discloses a method for safe and efficient transmission of remote sensing satellite raw code stream data across network areas, which belongs to the field of cross-network data transmission and exchange. The above invention aims at the problem of reduced timeliness and reliability caused by cross-network transmission of remote sensing satellite raw code stream data, and provides a method for safe and efficient transmission of remote sensing satellite raw code stream data across network areas based on a one-way transmission device and a CD ferry device resource pool. The method uses two cross-network devices in combination, and designs and implements cross-network transmission strategies such as data packetization, file naming rules, task priority, and data packet failure retransmission in the case of multi-task concurrent cross-network transmission of remote sensing satellite raw code stream data, thereby solving the problem of safe and efficient transmission of remote sensing satellite raw code stream data across network areas.

[0005] However, the above data transmission method still has the following defects: the signal processing before signal transmission is complicated, which may cause packet loss or damage of the transmission signal and cannot ensure high signal accuracy. Moreover, the whole scheme still only performs signal processing for efficient signal transmission. The high-precision small optoelectronic detection satellite is small in size and has insufficient encryption capability. The signals sent directly from the detection satellite are at risk of being intercepted and leaked, and it is impossible to perform security and leakage prevention processing on the high-precision optoelectronic signals.

[0006] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable method for secure transmission of photoelectric detection data. Summary of the invention

[0007] The purpose of the present invention is to provide a method for secure transmission of photoelectric detection data. The signal processing is simple and can be used to process high-precision photoelectric signals. The characteristics of the photoelectric signals and the frequency offset characteristics caused by the displacement of the relay satellite are used to effectively modulate the photoelectric signals, thereby ensuring that only the relay satellite can obtain the effective photoelectric signals, and then use the high performance of the relay satellite to encrypt and transmit them back to the ground, thereby effectively avoiding the risk of signal interception and leakage due to insufficient encryption capabilities of the detection small satellite.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for secure transmission of photoelectric detection data comprises the following steps:

[0010] S1: Acquire the data signal collected by the photoelectric detection device to obtain the readable wavelength range of the data signal;

[0011] S2: Obtain the distance and relative speed between the photoelectric detection device and the preset signal relay point;

[0012] S3: modulate the data signal to obtain a modulated signal;

[0013] S4: The photoelectric detection device sends the modulated signal to a preset signal relay point, so that the wavelength of the modulated signal after the frequency shift after arriving at the preset signal relay point is within the readable wavelength range;

[0014] S5: The preset signal relay point encrypts the acquired signal and then sends it to the collection center.

[0015] As one of the preferred embodiments of the present invention, when executing step S1, the optical signal collected by the photoelectric detection device is directly obtained, converted into an electrical signal to obtain an original data signal, and then the readable wavelength range of the original data signal is obtained.

[0016] As one of the preferred embodiments of the present invention, when executing step S2, the distance and relative speed between the photoelectric detection device and the preset signal relay point are obtained, and the frequency offset value generated when the photoelectric signal is sent from the photoelectric detection device to the preset signal relay point is calculated.

[0017] As one of the preferred embodiments of the present invention, when executing step S3, it specifically includes:

[0018] S31: frequency-converting and adjusting the data signal to obtain a frequency-converted data signal, so that the wavelength of the frequency-converted data signal is a limit readable wavelength within a readable wavelength range;

[0019] S32: reversely modulate the frequency-converted data signal according to the frequency offset value to obtain a modulated signal, and ensure that the modulated signal is not within the readable wavelength range.

[0020] As one of the preferred embodiments of the present invention, when executing step S4, the photoelectric detection device sends the modulated signal to the preset signal relay point, so that the wavelength of the modulated signal after frequency shift when it reaches the preset signal relay point is equal to the wavelength of the frequency-converted data signal, that is, the preset signal relay point obtains the frequency-converted data signal at the extreme readable wavelength.

[0021] As one of the preferred embodiments of the present invention, when executing step S5, specifically:

[0022] S51: The preset signal relay point performs frequency conversion callback on the obtained data signal under the extreme readable wavelength to obtain the original data signal of step S1;

[0023] S52: The preset signal relay point encrypts the original data signal to obtain an encrypted signal;

[0024] S53: The preset signal relay point sends the encrypted signal to the collection center.

[0025] As one of the preferred embodiments of the present invention, when executing step S2, at least three preset signal relay points within the communication range of the photoelectric detection device are obtained, and the distance and relative speed between the photoelectric detection device and each preset signal relay point are respectively obtained.

[0026] As one of the preferred embodiments of the present invention, when executing step S31, the frequency conversion adjustment includes frequency amplification adjustment and / or frequency reduction adjustment.

[0027] As one of the preferred embodiments of the present invention, when executing step S31, the information leakage danger zone emitted by the photoelectric detection device signal is obtained, and the relative speed between the photoelectric detection device and the information leakage danger zone, that is, the danger speed value, is obtained; among multiple preset signal relay points, the preset signal relay point with the largest difference between the photoelectric detection device and its relative speed and the danger speed value is selected as the target preset signal relay point, and one of the frequency amplification adjustment and the frequency reduction adjustment is selected;

[0028] When step S2 is executed, the device in the information leakage risk area obtains the modulated signal, and after the frequency shift, the obtained signal is not within the readable wavelength range.

[0029] As one of the preferred embodiments of the present invention, when executing step S4, when waiting for the distance between the photoelectric detection device and the target preset signal relay point to be no greater than the preset distance value, the photoelectric detection device sends the modulated signal to the target preset signal relay point.

[0030] The beneficial effects of the photoelectric detection data secure transmission method of the present invention are: signal processing is simple, high-precision photoelectric signals can be processed, and the photoelectric signals are effectively modulated by utilizing the characteristics of the photoelectric signals and the frequency offset characteristics caused by the displacement of the relay satellite, ensuring that only the relay satellite can obtain the effective photoelectric signals, and then the high performance of the relay satellite is utilized to encrypt and transmit them back to the ground, effectively avoiding the risk of signal interception and leakage due to insufficient encryption capabilities of the detection small satellite. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a flow chart of a method for secure transmission of photoelectric detection data according to the present invention. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of modules and structures set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0035] Technologies, methods, and systems known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and systems should be considered part of the authorization specification.

[0036] Embodiment 1: Figure 1As shown, it is only one embodiment of the present invention, a method for secure transmission of photoelectric detection data, comprising the following steps:

[0037] S1: Acquire the data signal collected by the photoelectric detection device to obtain the readable wavelength range of the data signal;

[0038] Steps S1 to S4 are located in a small photoelectric detection satellite. Small satellites are small in size, have low computing power, and have slightly lower signal encryption strength. There is a risk that the signal sent may be hijacked. Therefore, we do not directly send out photoelectric detection signals, or even encrypt them directly before sending them. Special preparation is required.

[0039] In any case, it is necessary to first obtain the photoelectric data signal collected by the photoelectric detection equipment, and due to the characteristics of the photoelectric signal itself, the readable wavelength range is relatively small. Once the frequency changes and the wavelength exceeds the readable wavelength range, the photoelectric signal will be unreadable. Even if it is hijacked, it will only be a bunch of garbled characters.

[0040] S2: Obtain the distance and relative speed between the photoelectric detection device and the preset signal relay point;

[0041] The photoelectric detection equipment is installed on the small detection satellite. In fact, it obtains the distance and relative speed between the small detection satellite and the relay satellite. The preset signal relay point is generally a synchronous satellite. The synchronous satellite is used as a relay satellite because of its large size and strong computing power. The risk of hijacking of encrypted data is greatly reduced.

[0042] S3: modulate the data signal to obtain a modulated signal;

[0043] Due to the speed difference between the small detection satellite and the preset signal relay point, when two high-speed moving objects communicate in space, the microwave signal will have a significant frequency offset due to the Doppler effect. For example, when the small detection satellite is close to the preset signal relay point, the signal frequency received by the relay satellite is higher than the signal frequency sent by the small detection satellite. This Doppler effect sometimes makes the transmission signal data unreadable. We effectively utilize the characteristics of frequency offset, reversely add the frequency offset value to the photoelectric detection data signal, modulate the data signal, and obtain a modulated signal.

[0044] For example, when the small detection satellite approaches the preset signal relay point, the frequency of the data signal obtained in step S1 is a, and the Doppler effect causes the frequency to become higher by b. Then, when the data signal is modulated, the frequency of the data signal is directly reduced in reverse to obtain a modulated signal with a frequency of ab.

[0045] It should be noted that the modulated signal is not within the readable wavelength range

[0046] S4: The photoelectric detection device sends the modulated signal to a preset signal relay point, so that the wavelength of the modulated signal after the frequency shift after arriving at the preset signal relay point is within the readable wavelength range;

[0047] The photoelectric detection device sends a modulated signal with a frequency of ab to a preset signal relay point, so that after the modulated signal reaches the preset signal relay point and undergoes frequency shift, the preset signal relay point just obtains a data signal with a frequency of a, and the wavelength of this signal is within the readable wavelength range.

[0048] However, when other satellite equipment intercepts the modulated signal, it will not be able to intercept the effective photoelectric detection signal because the modulated signal is not within the readable wavelength range.

[0049] S5: The preset signal relay point encrypts the acquired signal and then sends it to the collection center.

[0050] Step S5, located in the preset signal relay point, due to the large size and strong computing power of the synchronous satellite, the risk of hijacking of encrypted data is greatly reduced.

[0051] The present invention provides a method for secure transmission of photoelectric detection data. The signal processing is simple and can be performed on high-precision photoelectric signals. The photoelectric signals are effectively modulated by utilizing the characteristics of the photoelectric signals and the frequency offset characteristics caused by the displacement of relay satellites, thereby ensuring that only the relay satellites can obtain effective photoelectric signals. The signals are then encrypted and transmitted back to the ground using the high performance of the relay satellites, thereby effectively avoiding the risk of signal interception and leakage due to insufficient encryption capabilities of the detection satellites.

[0052] Embodiment 2: Still as Figure 1 The figure shown is only one of the embodiments of the present invention. On the basis of the first embodiment, in a method for secure transmission of photoelectric detection data of the present invention, when executing step S1, the optical signal collected by the photoelectric detection device is directly obtained, converted into an electrical signal to obtain the original data signal, and then the readable wavelength range of the original data signal is obtained.

[0053] In addition, when executing step S2, the distance and relative speed between the photoelectric detection device and the preset signal relay point are obtained, and the frequency offset value generated when the photoelectric signal is sent from the photoelectric detection device to the preset signal relay point is calculated.

[0054] Then, when executing step S3, it specifically includes:

[0055] S31: frequency-converting and adjusting the data signal to obtain a frequency-converted data signal, so that the wavelength of the frequency-converted data signal is a limit readable wavelength within a readable wavelength range;

[0056] S32: reversely modulate the frequency-converted data signal according to the frequency offset value to obtain a modulated signal, and ensure that the modulated signal is not within the readable wavelength range.

[0057] In the present invention, when executing step S4, the photoelectric detection device sends the modulated signal to the preset signal relay point, so that the wavelength of the modulated signal after frequency shift when it reaches the preset signal relay point is equal to the wavelength of the frequency-converted data signal, that is, the preset signal relay point obtains the frequency-converted data signal at the extreme readable wavelength.

[0058] Finally, when executing step S5, specifically:

[0059] S51: The preset signal relay point performs frequency conversion callback on the obtained data signal under the extreme readable wavelength to obtain the original data signal of step S1;

[0060] S52: The preset signal relay point encrypts the original data signal to obtain an encrypted signal;

[0061] S53: The preset signal relay point sends the encrypted signal to the collection center.

[0062] Embodiment 3: Still as Figure 1 The figure shown is only one of the embodiments of the present invention. On the basis of any of the above embodiments, in a method for secure transmission of photoelectric detection data of the present invention, when executing step S2, at least three preset signal relay points within the communication range of the photoelectric detection device are obtained, and the distance and relative speed between the photoelectric detection device and each preset signal relay point are obtained respectively.

[0063] Of course, when executing step S31, the frequency conversion adjustment includes frequency amplification adjustment and / or frequency reduction adjustment.

[0064] Moreover, when executing step S31, the information leakage danger zone emitted by the photoelectric detection device signal is obtained, and the relative speed between the photoelectric detection device and the information leakage danger zone, that is, the danger speed value, is obtained; among multiple preset signal relay points, the preset signal relay point with the largest difference between the photoelectric detection device and its relative speed and the danger speed value is selected as the target preset signal relay point, and one of the frequency amplification adjustment and the frequency reduction adjustment is selected;

[0065] In other words, areas in space where there is a high possibility of satellite hijacking should be identified in advance and regarded as risk areas for information leakage. The relative speed between the photoelectric detection equipment and the risk areas for information leakage should be determined. The relative speed includes the absolute speed value and the relative moving direction.

[0066] For example: a small detection satellite is approaching the dangerous area, then it is best to select the maximum frequency in the readable wavelength range (i.e. the minimum readable wavelength), so that the signal of the maximum frequency is further amplified after the Doppler effect and exceeds the readable wavelength range; then the frequency amplification adjustment should be selected to modulate the data signal; at this time, it is best to select the preset signal relay point that the photoelectric detection equipment is moving away from, and away from the preset signal relay point with the fastest speed, and send a modulated signal to it.

[0067] When step S2 is executed, the device in the information leakage risk area obtains the modulated signal, and after the frequency shift, the obtained signal is not within the readable wavelength range.

[0068] Finally, when executing step S4, if the distance between the photoelectric detection device and the target preset signal relay point is too large and exceeds the communication accuracy range of the small detection satellite, the photoelectric detection device can wait until the distance between the photoelectric detection device and the target preset signal relay point is not greater than the preset distance value, and the photoelectric detection device sends the modulated signal to the target preset signal relay point;

[0069] Of course, if the distance between the photoelectric detection equipment and the target preset signal relay point is too large, exceeding the communication accuracy range of the small detection satellite, a new preset signal relay point can also be reselected.

[0070] The present invention provides a method for secure transmission of photoelectric detection data. The signal processing is simple and can be performed on high-precision photoelectric signals. The photoelectric signals are effectively modulated by utilizing the characteristics of the photoelectric signals and the frequency offset characteristics caused by the displacement of relay satellites, thereby ensuring that only the relay satellites can obtain effective photoelectric signals. The signals are then encrypted and transmitted back to the ground using the high performance of the relay satellites, thereby effectively avoiding the risk of signal interception and leakage due to insufficient encryption capabilities of the detection satellites.

[0071] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for secure transmission of photoelectric detection data, characterized in that: The following steps are involved: S1: Acquire the data signal collected by the photoelectric detection device to obtain the readable wavelength range of the data signal; S2: Obtain the distance and relative speed between the photoelectric detection device and the preset signal relay point; S3: modulate the data signal to obtain a modulated signal; S4: The photoelectric detection device sends the modulated signal to a preset signal relay point, so that the wavelength of the modulated signal after the frequency shift after arriving at the preset signal relay point is within the readable wavelength range; S5: The preset signal relay point encrypts the acquired signal and then sends it to the collection center.

2. A method for secure transmission of photoelectric detection data according to claim 1, characterized in that: When executing step S1, the optical signal collected by the photoelectric detection device is directly obtained, converted into an electrical signal, and the original data signal is obtained, and then the readable wavelength range of the original data signal is obtained.

3. A method for secure transmission of photoelectric detection data according to claim 2, characterized in that: When executing step S2, the distance and relative speed between the photoelectric detection device and the preset signal relay point are obtained, and the frequency offset value generated when the photoelectric signal is sent from the photoelectric detection device to the preset signal relay point is calculated.

4. A method for secure transmission of photoelectric detection data according to claim 3, characterized in that: When executing step S3, it specifically includes: S31: frequency-converting and adjusting the data signal to obtain a frequency-converted data signal, so that the wavelength of the frequency-converted data signal is a limit readable wavelength within a readable wavelength range; S32: reversely modulate the frequency-converted data signal according to the frequency offset value to obtain a modulated signal, and ensure that the modulated signal is not within the readable wavelength range.

5. A method for secure transmission of photoelectric detection data according to claim 4, characterized in that: When executing step S4, the photoelectric detection device sends the modulated signal to the preset signal relay point, so that the wavelength of the modulated signal after frequency shift when it reaches the preset signal relay point is equal to the wavelength of the frequency-converted data signal, that is, the preset signal relay point obtains the frequency-converted data signal at the extreme readable wavelength.

6. A method for secure transmission of photoelectric detection data according to claim 2, characterized in that: When executing step S5, specifically: S51: The preset signal relay point performs frequency conversion callback on the obtained data signal under the extreme readable wavelength to obtain the original data signal of step S1; S52: The preset signal relay point encrypts the original data signal to obtain an encrypted signal; S53: The preset signal relay point sends the encrypted signal to the collection center.

7. A method for secure transmission of photoelectric detection data according to claim 4, characterized in that: When executing step S2, at least three preset signal relay points within the communication range of the photoelectric detection device are obtained, and the distance and relative speed between the photoelectric detection device and each preset signal relay point are respectively obtained.

8. A method for secure transmission of photoelectric detection data according to claim 7, characterized in that: When executing step S31, the frequency conversion adjustment includes frequency amplification adjustment and / or frequency reduction adjustment.

9. A method for secure transmission of photoelectric detection data according to claim 8, characterized in that: When executing step S31, the information leakage danger zone emitted by the photoelectric detection device signal is obtained, and the relative speed between the photoelectric detection device and the information leakage danger zone, that is, the danger speed value, is obtained; among multiple preset signal relay points, the preset signal relay point with the largest difference between the photoelectric detection device and its relative speed and the danger speed value is selected as the target preset signal relay point, and one of the frequency amplification adjustment and the frequency reduction adjustment is selected; When step S2 is executed, the device in the information leakage risk area obtains the modulated signal, and after the frequency shift, the obtained signal is not within the readable wavelength range.

10. A method for secure transmission of photoelectric detection data according to claim 9, characterized in that: When executing step S4, when waiting for the distance between the photoelectric detection device and the target preset signal relay point to be no greater than the preset distance value, the photoelectric detection device sends the modulated signal to the target preset signal relay point.

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