Solar blind ultraviolet ranging system and method
By using a solar-blind ultraviolet ranging system, which modulates ultraviolet light pulse signals with pseudo-random digital sequences for ranging, the problem of low accuracy in infrared ranging under strong light conditions is solved, and a fast and accurate ranging effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
- Filing Date
- 2022-09-30
- Publication Date
- 2026-06-02
AI Technical Summary
In environments with strong sunlight, infrared laser rangefinders are susceptible to infrared noise interference, leading to decreased measurement accuracy or even rendering them unusable.
A solar-blind ultraviolet ranging system is adopted. A pseudo-random digital sequence is generated by the modulation transmitter and modulated onto ultraviolet pulse light. The ultraviolet pulse signal is used for ranging, and the distance is calculated by decoding, demodulation and synchronization processing at the receiver.
It achieves rapid and accurate ranging in strong sunlight, overcomes the problem of low accuracy of infrared laser ranging under strong light, and improves ranging response rate, real-time performance and accuracy.
Smart Images
Figure CN115575970B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of optoelectronic information technology, and in particular to a solar-blind ultraviolet ranging system and method. Background Technology
[0002] Ranging technology has a long history of development and is widely used in aerospace, aviation, geological exploration, autonomous driving, drones, and other fields. With the continuous development of science and technology and manufacturing processes, the demand for ranging technology in practical applications is becoming increasingly greater, with different requirements being placed on measurement accuracy, measurement time, and environmental conditions.
[0003] Currently, the most common rangefinders use infrared laser ranging, a mature technology with advantages such as long measurement distance, high accuracy, and fast response speed. However, in environments with strong sunlight, the surrounding environment produces infrared noise, resulting in excessive noise in the detected signal. This significantly reduces the measurement accuracy of infrared laser ranging, and in severe cases, renders it unusable. Summary of the Invention
[0004] To address the problems of existing technologies, this disclosure proposes a solar-blind ultraviolet ranging system and method, which at least partially solves the technical problem that infrared laser ranging has low measurement accuracy or is even unusable in environments with strong sunlight.
[0005] One embodiment of this disclosure provides a solar-blind ultraviolet ranging system, comprising: a modulation transmitting end, used to generate a pseudo-random digital sequence, modulate the pseudo-random digital sequence onto ultraviolet pulse light to generate an ultraviolet light pulse signal, and send the ultraviolet light pulse signal to the target to be measured; and a receiving ranging end, used to receive the ultraviolet light pulse signal reflected by the target to be measured, convert the reflected ultraviolet light pulse signal into a digital signal, perform decoding, demodulation, synchronization processing and channel estimation on the digital signal to obtain time information, and calculate the distance between the ranging system and the target to be measured based on the time information.
[0006] According to an embodiment of this disclosure, the modulation and transmitting end includes a digital pulse signal generation module, a circuit system, an ultraviolet light source, and a first optical system connected in sequence, wherein: the digital pulse signal generation module is used to generate a 0-1 digital signal sequence in an m-sequence manner as a pseudo-random digital sequence; the circuit system is used to modulate the pseudo-random digital sequence onto the ultraviolet light generated by the ultraviolet light source to generate an ultraviolet light pulse signal; and the first optical system is used to collimate and expand the ultraviolet light pulse signal before transmitting it to the target to be measured.
[0007] According to an embodiment of this disclosure, the receiving ranging end includes a second optical system, a photomultiplier tube, a circuit amplification module, a sampling module, a digital signal processing module, and a data display module connected in sequence. The second optical system filters the reflected ultraviolet light pulse signal to remove environmental noise. The photomultiplier tube amplifies the filtered ultraviolet light pulse signal, converting it into a current signal. The circuit amplification module amplifies the current signal a second time, converting it into a voltage signal. The sampling module samples the voltage signal, converting it into a digital signal. The digital signal processing module demodulates, decodes, and synchronizes the digital signal to form a time-related signal. After channel estimation, it obtains time information and calculates the distance between the ranging system and the target based on the time information. The data display module displays the distance between the ranging system and the target.
[0008] According to an embodiment of this disclosure, the digital signal processing module includes: a clock generation unit for generating clock signals in different time domains; a time counting unit for starting counting upon triggering an enable signal sent by the circuit system; a photon counting unit for performing binarization determination and rising edge detection on the digital signal, and counting the number of rising edges of optical pulses in the digital signal; a data synchronization unit for performing correlation calculation between the number of rising edges of optical pulses in the digital signal and a locally pre-stored synchronization frame sequence to obtain the moment with the strongest correlation, and generating an enable signal at that moment to control the time counting unit to stop counting; a distance decision unit for calculating the distance between the ranging system and the target to be measured based on the time information obtained by the time counting unit; and a data buffer module for buffering data transmitted between different units.
[0009] According to an embodiment of this disclosure, the digital signal is a differential signal; the photon counting unit performs binarization determination and rising edge detection on the digital signal, including: converting the differential signal into a single-ended photon signal for binarization processing; changing the pseudo-random numbers of the single-ended photon signal that meets the threshold condition to 1; and changing the pseudo-random numbers of the single-ended photon signal that does not meet the threshold condition to 0; performing multiple symbol slicing processes on each symbol of the binarized single-ended photon signal; detecting the rising edges contained in each symbol slice; and obtaining the number of rising edges in each symbol slice.
[0010] According to embodiments of this disclosure,
[0011]
[0012] Calculate the number of rising edges G(m) for each symbol slice, where H(k) is the rising edge data of each detected symbol slice, m is the symbol slice number, r is the sampling frequency of the sampling module, v represents the communication rate, and M represents the number of slices for each symbol.
[0013] According to embodiments of this disclosure, the data synchronization unit calculates the correlation between the number of rising edges of optical pulses in the digital signal and a locally pre-stored synchronization frame sequence to obtain the moments with the strongest correlation, including: based on...
[0014]
[0015] The correlation between the number of rising edges of the optical pulse and the locally stored synchronization frame sequence in the time domain is calculated as corr(t), where F(n) represents the nth symbol in the local synchronization sequence frame header, N represents the total number of symbols in the local sequence, M represents the number of symbol slices for each symbol, and G(m) is the number of rising edges of the mth symbol slice.
[0016] According to an embodiment of this disclosure, the optical lens of the first optical system is composed of a total internal reflection lens and a beam expander; the second optical system is composed of a photonic filter and an optical lens, wherein the photonic filter is designed to be externally mounted.
[0017] According to embodiments of this disclosure, the ultraviolet light source includes a light-emitting diode, a laser, or a low-pressure mercury lamp; the adjustment method corresponding to the ultraviolet light source includes binary on / off keying modulation, or quadrature amplitude modulation, or digital pulse interval modulation, or frequency shift keying modulation.
[0018] Another aspect of this disclosure provides a solar-blind ultraviolet ranging method based on the aforementioned solar-blind ultraviolet ranging system, comprising: generating a pseudo-random digital sequence through a modulation transmitter, modulating the pseudo-random digital sequence onto ultraviolet light to generate an ultraviolet light pulse signal, and transmitting the ultraviolet light pulse signal to the target; receiving the ultraviolet light pulse signal reflected by the target through a receiving ranging end, converting the reflected ultraviolet light pulse signal into a digital signal, performing decoding, demodulation, synchronization processing, and channel estimation on the digital signal to obtain time information, and calculating the distance between the ranging system and the target based on the time information.
[0019] The solar-blind ultraviolet ranging system and method provided according to the embodiments of this disclosure have at least the following beneficial effects:
[0020] Distance measurement is achieved by transmitting ultraviolet pulse signals based on pseudo-random digital sequences at the modulation transmitter. This allows the receiving end to calculate time information through photonic decoding, demodulation, and synchronous processing, and then acquire distance data based on this time information. This realizes photonic-level ranging, resulting in a system with fast response, good real-time performance, and high accuracy. Furthermore, due to the strong absorption of ultraviolet light by the ozone layer, ground-level ambient light noise contains almost no ultraviolet component, creating an ultraviolet solar blind zone. This overcomes the technical problem that infrared laser ranging methods cannot operate under sunlight.
[0021] Furthermore, by rationally designing the functional units of the digital signal processing module, the digital signal processing module can process signals based on a combination of photon counting and time counting to calculate distance, thereby further improving the response rate, real-time performance, accuracy, and stability of the ranging system. Attached Figure Description
[0022] Figure 1 The schematic diagram illustrates the structure of the solar-blind ultraviolet ranging system provided in the embodiments of this disclosure.
[0023] Figure 2 The schematic diagram illustrates the structure of the modulation transmitter and the receiving ranging end provided in the embodiments of this disclosure.
[0024] Figure 3 The flowchart illustrating the process of a photon counting unit according to an embodiment of the present disclosure performing binarization determination and rising edge detection of a digital signal is shown.
[0025] Figure 4 The schematic diagram illustrates the principle of correlation calculation based on a sliding window provided in an embodiment of this disclosure. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.
[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.
[0028] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0029] In the description of this disclosure, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the subsystem or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.
[0030] Throughout the accompanying drawings, identical elements are represented by the same or similar reference numerals. Conventional structures or constructions have been omitted where they may cause confusion in understanding this disclosure. Furthermore, the shapes, dimensions, and positional relationships of the components in the drawings do not reflect actual size, scale, or actual positional relationships. Additionally, any reference numerals placed between parentheses in the claims should not be construed as limiting the claims.
[0031] Similarly, to simplify this disclosure and aid in understanding one or more of the various aspects of the disclosure, in the above description of exemplary embodiments of the present disclosure, various features of the present disclosure are sometimes grouped together in a single embodiment, figure, or description thereof. The use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present disclosure. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0033] Figure 1 The schematic diagram illustrates the structure of the solar-blind ultraviolet ranging system provided in the embodiments of this disclosure.
[0034] like Figure 1 As shown, the solar-blind ultraviolet ranging system includes a modulation transmitter and a receiving ranging end.
[0035] The modulation transmitter is used to generate a pseudo-random digital sequence, modulate the pseudo-random digital sequence onto ultraviolet pulse light to generate an ultraviolet pulse signal, and send the ultraviolet pulse signal to the target under test.
[0036] The receiving and ranging end is used to receive ultraviolet light pulse signals reflected by the target, convert the reflected ultraviolet light pulse signals into digital signals, perform decoding, demodulation, synchronization processing and channel estimation on the digital signals to obtain time information, and calculate the distance between the ranging system and the target based on the time information.
[0037] Figure 2 The schematic diagram illustrates the structure of the modulation transmitter and the receiving ranging end provided in the embodiments of this disclosure.
[0038] like Figure 2 As shown, the modulation transmitter may include a digital pulse signal generation module, a circuit system, an ultraviolet light source, and a first optical system connected in sequence.
[0039] The digital pulse signal generation module is used to generate a 0-1 digital signal sequence through an m-sequence method, which serves as a pseudo-random digital sequence and has excellent pseudo-randomness.
[0040] The circuit system is used to modulate a pseudo-random digital sequence onto ultraviolet light generated by an ultraviolet light source to produce an ultraviolet light pulse signal.
[0041] The first optical system is used to collimate and expand the ultraviolet light pulse signal before sending it to the target to be measured.
[0042] In one embodiment of this disclosure, the optical lens module of the first optical system is composed of a total internal reflection (TIR) lens and a beam expander. The TIR lens optically collimates the ultraviolet light pulse signal, and the beam expander expands the ultraviolet light pulse signal to ensure the intensity and directionality of the light source emission, thereby transmitting a photon signal with the required intensity and range.
[0043] In this embodiment, the ultraviolet light source may include, for example, a light-emitting diode, a laser, or a low-pressure mercury lamp. Different modulation methods will be employed to match the ultraviolet light source, including binary on-off keying (OOK) modulation, quadrature amplitude modulation (QAM), digital pulse interval modulation (DPIM), or frequency shift keying (FSK), etc. The wavelength of the ultraviolet light generated by the ultraviolet light source can be between 265-280 nm.
[0044] The receiving ranging end includes a second optical system, a photomultiplier tube, a circuit amplification module, a sampling module, a digital signal processing module, and a data display module connected in sequence.
[0045] The second optical system is used to filter the reflected ultraviolet light pulse signal to remove environmental noise.
[0046] A photomultiplier tube is used to amplify filtered ultraviolet light pulse signals and convert them into current signals.
[0047] The circuit amplification module is used to amplify the current signal a second time and convert the current signal into a voltage signal.
[0048] The sampling module is used to sample voltage signals and convert them into digital signals.
[0049] The digital signal processing module is used to demodulate, decode, and synchronize digital signals to form time-related signals. After channel estimation, time information is obtained, and the distance between the ranging system and the target under test is calculated based on the time information.
[0050] The data display module is used to display the distance between the ranging system and the target being measured.
[0051] In this embodiment, the second optical system may consist of a photonic level filter and an optical lens, wherein the photonic level filter is designed to be externally mounted. The reflected ultraviolet light pulse signal first passes through the photonic level filter to filter out environmental noise photons other than the target ultraviolet photons, and then undergoes optical shaping through the optical lens.
[0052] In this embodiment of the present disclosure, the photomultiplier tube is disposed at the focal point of the second optical system.
[0053] In this embodiment, the circuit amplification module is compatible with both the function of further amplifying the current signal and converting the current change into a voltage change.
[0054] In this embodiment of the disclosure, the sampling module adopts an ADC sampling module.
[0055] In this embodiment of the disclosure, the liquid crystal display panel can be controlled via a serial port to display the distance measurement information.
[0056] Furthermore, the digital signal processing module mainly uses the FPGA development platform for data signal processing, and may include a clock generation unit, a time counting unit, a photon counting unit, a data synchronization unit, a distance decision unit, and a data buffer module.
[0057] The clock generation unit is used to generate clock signals in different clock domains based on the crystal oscillator.
[0058] The time counting unit is used to start counting when triggered by an enable signal sent by the circuit system. Specifically, when the circuit system drives the ultraviolet light source to generate an ultraviolet light pulse signal, an enable signal is generated for the time counting unit to drive the time calculation unit to start counting at the beginning of light emission.
[0059] The photon counting unit is used to perform binarization and rising edge detection on digital signals, and to count the number of rising edges of light pulses in the digital signal.
[0060] The data synchronization unit is used to calculate the correlation between the number of rising edges of optical pulses in the digital signal and the locally pre-stored synchronization frame sequence to obtain the moment with the strongest correlation, and at that moment, generate an enable signal to control the time counting unit to stop counting.
[0061] The distance decision unit is used to calculate the distance between the ranging system and the target to be measured based on the time information obtained from the time counting unit.
[0062] The data buffer module is used to buffer data transmitted between different units. Using a data buffer module for buffering ensures the stability of the clock signal and guarantees ranging accuracy.
[0063] In this embodiment of the disclosure, the digital signal obtained by the sampling module is generally a differential signal. In order to perform subsequent related calculations, the differential digital signal needs to be converted into a single-ended digital signal for processing in the FPGA.
[0064] Figure 3 The flowchart illustrating the process of a photon counting unit according to an embodiment of the present disclosure performing binarization determination and rising edge detection of a digital signal is shown.
[0065] like Figure 3 As shown, the photon counting process is as follows:
[0066] First, the differential signal is converted into a single-ended photon signal and binarized. Threshold conditions are set according to different environments. The pseudo-random numbers of the single-ended photon signals that meet the threshold conditions are changed to 1, and the pseudo-random numbers of the single-ended photon signals that do not meet the threshold conditions are changed to 0, thus obtaining a 0-1 photon signal sequence.
[0067] Then, each symbol of the binarized single-ended photon signal is processed into multiple symbol slices, and the rising edges contained in each symbol slice are detected to obtain the number of rising edges in each symbol slice.
[0068] Specifically, it can be based on
[0069]
[0070] The number of rising edges G(m) for each symbol slice is calculated to obtain the photon counting result. Here, H(k) represents the rising edge data of each detected symbol slice, m is the symbol slice number, r is the sampling frequency of the sampling module, v represents the communication rate, and M represents the number of slices for each symbol.
[0071] Furthermore, a counter can be set to control the duration of a symbol slice.
[0072] In this embodiment, the data synchronization module can perform correlation calculation between the counting result of the photon counting module and the local synchronization frame sequence based on the sliding window method. By controlling the change of the smallest slice unit, the correlation result can be obtained in real time. When the correlation result meets the set threshold, it jumps to the precise positioning stage. At this time, the correlation data is stored. When the obtained correlation is less than this time in both the previous and next time moments, the time with the highest correlation is recovered by using the stored correlation information and time. At this time, an enable signal is generated and sent to the time counting module to control the shutdown of the time counting module.
[0073] Figure 4 The schematic diagram illustrates the principle of correlation calculation based on a sliding window provided in an embodiment of this disclosure.
[0074] like Figure 4 As shown, the process of correlation calculation based on a sliding window is as follows:
[0075] First, a symbol slice is determined based on a sliding window. For this symbol slice, according to...
[0076]
[0077] The correlation between the number of rising edges of the optical pulse and the locally pre-stored synchronization frame sequence in the time domain is calculated as corr(t), where F(n) represents the nth symbol in the local synchronization sequence frame header, N represents the total number of symbols in the local sequence, M represents the number of symbol slices divided for each symbol, G(m) is the number of rising edges of the mth symbol slice, and t represents time.
[0078] Then, the sliding window slides forward to the next symbol slice, and the above operation is repeated to calculate the correlation corr(t) between the number of rising edges of the optical pulses in the symbol slice and the locally pre-stored synchronization frame sequence in the time domain. Then, the time corresponding to the maximum value is found from the correlation corr(t) in the time domain. At this time, an enable signal is sent to the time counting module to control the time counting module to stop counting and obtain time information.
[0079] In this embodiment, the distance decision module receives time information, calculates the distance result, and stores the result in ROM, indicating the completion of one optical pulse ranging operation. Simultaneously, it sends an enable signal to the digital pulse signal generation module again to control the emission of photon signals, repeats the distance measurement multiple times, performs mathematical optimization to determine the final distance result, and then transmits it to the data display module.
[0080] According to
[0081]
[0082] The distance L between the ranging system and the target is calculated using time information, where c is the speed of ultraviolet light, t is the time obtained from the test, and Q represents the time delay caused by other times.
[0083] In this embodiment of the disclosure, the data display module can be a liquid crystal display module, which can display distance data L and related ranging information.
[0084] Based on the unified inventive concept, this disclosure also provides a solar-blind ultraviolet ranging method, which is based on the above-described solar-blind ultraviolet ranging system and includes:
[0085] First, a pseudo-random digital sequence is generated by the modulation transmitter, and then modulated onto ultraviolet light to generate an ultraviolet light pulse signal, which is then sent to the target to be tested.
[0086] Then, the ultraviolet light pulse signal reflected by the target is received by the receiving ranging end, the reflected ultraviolet light pulse signal is converted into a digital signal, the digital signal is decoded, demodulated, synchronized and channel estimated to obtain time information, and the distance between the ranging system and the target is calculated based on the time information.
[0087] It should be noted that the implementation part of the solar-blind ultraviolet ranging method provided in this disclosure corresponds to the implementation part of the solar-blind ultraviolet ranging system, and the implementation details and the resulting technical effects are similar or the same, so they will not be repeated here.
[0088] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.
Claims
1. A solar-blind ultraviolet ranging system, characterized in that, include: The modulation transmitter is used to generate a pseudo-random digital sequence, modulate the pseudo-random digital sequence onto ultraviolet light to generate an ultraviolet light pulse signal, and send the ultraviolet light pulse signal to the target to be tested; The ranging receiver includes, in sequence, a second optical system, a photomultiplier tube, a circuit amplification module, a sampling module, a digital signal processing module, and a data display module. Specifically: the second optical system filters reflected ultraviolet light pulse signals to remove environmental noise; the photomultiplier tube amplifies the filtered ultraviolet light pulse signal, converting it into a current signal; the circuit amplification module amplifies the current signal a second time, converting it into a voltage signal; the sampling module samples the voltage signal, converting it into a digital signal; the digital signal processing module demodulates, decodes, and synchronizes the digital signal to form a time-related signal, performs channel estimation to obtain time information, and calculates the distance between the ranging system and the target based on the time information; and the data display module displays the distance between the ranging system and the target. The digital signal processing module includes: A clock generation unit is used to generate clock signals in different time domains; A time counting unit is used to start counting when triggered by an enable signal sent by the circuit system; A photon counting unit is used to perform binarization determination and rising edge detection on the digital signal, and to count the number of rising edges of light pulses in the digital signal. The data synchronization unit is used to calculate the correlation between the number of rising edges of optical pulses in the digital signal and the locally pre-stored synchronization frame sequence, obtain the moment with the strongest correlation, and generate an enable signal at that moment to control the time counting unit to stop counting. The distance decision unit is used to calculate the distance between the ranging system and the target to be measured based on the time information obtained by the time counting unit. The data caching module is used to cache data transmitted between different units.
2. The solar-blind ultraviolet ranging system according to claim 1, characterized in that, The modulation transmitting end includes a digital pulse signal generation module, a circuit system, an ultraviolet light source, and a first optical system connected in sequence, wherein: The digital pulse signal generation module is used to generate a 0-1 digital signal sequence in an m-sequence manner, which serves as the pseudo-random digital sequence. The circuit system is used to modulate the pseudo-random digital sequence onto the ultraviolet light generated by the ultraviolet light source to generate the ultraviolet light pulse signal; The first optical system is used to collimate and expand the ultraviolet light pulse signal before sending it to the target to be measured.
3. The solar-blind ultraviolet ranging system according to claim 1, characterized in that, The digital signal is a differential signal; the photon counting unit performs binarization determination and rising edge detection on the digital signal, including: The differential signal is converted into a single-ended photon signal and binarized. The pseudo-random numbers of the single-ended photon signals that meet the threshold condition are changed to 1, and the pseudo-random numbers of the single-ended photon signals that do not meet the threshold condition are changed to 0. Each symbol bit of the binarized single-ended photon signal is processed into multiple symbol slices. The rising edges contained in each symbol slice are detected to obtain the number of rising edges in each symbol slice.
4. The solar-blind ultraviolet ranging system according to claim 3, characterized in that, according to Calculate the number of rising edges G(m) for each symbol slice, where H(k) is the rising edge data of each detected symbol slice, m is the symbol slice number, r is the sampling frequency of the sampling module, v represents the communication rate, and M represents the number of slices for each symbol.
5. The solar-blind ultraviolet ranging system according to claim 1, characterized in that, The data synchronization unit calculates the correlation between the number of rising edges of optical pulses in the digital signal and the locally pre-stored synchronization frame sequence to obtain the moments with the strongest correlation, including: according to The correlation between the number of rising edges of the optical pulse and the locally pre-stored synchronization frame sequence in the time domain is calculated as corr(t), where F(n) represents the nth symbol in the local synchronization sequence frame header, N represents the total number of symbols in the local sequence, M represents the number of symbol slices for each symbol, G(m) is the number of rising edges of the mth symbol slice, and t represents time.
6. The solar-blind ultraviolet ranging system according to claim 2, characterized in that, The optical lens of the first optical system is composed of a total internal reflection lens and a beam expander lens; The second optical system consists of a photonic level filter and an optical lens, wherein the photonic level filter is designed to be externally mounted.
7. The solar-blind ultraviolet ranging system according to claim 2, characterized in that, The ultraviolet light source includes a light-emitting diode, a laser, or a low-pressure mercury lamp; The adjustment methods corresponding to the ultraviolet light source include binary on / off keying modulation, quadrature amplitude modulation, digital pulse interval modulation, or frequency shift keying modulation.
8. A solar-blind ultraviolet ranging method, wherein the solar-blind ultraviolet ranging method is implemented based on the solar-blind ultraviolet ranging system according to any one of claims 1-7, characterized in that, include: A pseudo-random digital sequence is generated by a modulation transmitter, and the pseudo-random digital sequence is modulated onto ultraviolet light to generate an ultraviolet light pulse signal, which is then sent to the target to be tested. The ranging system receives ultraviolet light pulse signals reflected from the target by the receiving and ranging end, converts the reflected ultraviolet light pulse signals into digital signals, performs decoding, demodulation, synchronization processing and channel estimation on the digital signals to obtain time information, and calculates the distance between the ranging system and the target based on the time information.