CN111142089A - OBFN and PADC function integrated broadband radar signal receiving device and method - Google Patents
OBFN and PADC function integrated broadband radar signal receiving device and method Download PDFInfo
- Publication number
- CN111142089A CN111142089A CN202010025559.5A CN202010025559A CN111142089A CN 111142089 A CN111142089 A CN 111142089A CN 202010025559 A CN202010025559 A CN 202010025559A CN 111142089 A CN111142089 A CN 111142089A
- Authority
- CN
- China
- Prior art keywords
- unit
- optical
- obfn
- padc
- array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4861—Circuits for detection, sampling, integration or read-out
- G01S7/4863—Detector arrays, e.g. charge-transfer gates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4865—Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak
- G01S7/4866—Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak by fitting a model or function to the received signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses an OBFN and PADC function integrated broadband radar signal receiving device and a method, wherein the device comprises: the output end of the antenna array unit is connected with the microwave input end of the OBFN and PADC all-optical function integrated unit and is used for receiving a target echo signal; the optical pulse unit is used for generating a high-frequency repetitive optical pulse string; the optical input end of the all-optical function integration unit of the OBFN and PADC is connected with the output end of the optical pulse unit and is used for realizing the function integration of the OBFN and the photon ADC; the output end of the photoelectric conversion unit is connected with the input end of the electric ADC unit; the output end of the electric ADC unit is connected with the input end of the digital signal processing unit; the digital signal processing unit is used for synthesizing the broadband signal. The device improves the problem that two functional modules of the light-operated beam forming network and the photon ADC are incompatible in the optical domain spectrum, and reduces the loss while realizing function integration.
Description
Technical Field
The invention relates to the technical field of radar, in particular to a broadband radar signal receiving device and method integrating OBFN and PADC functions.
Background
Compared with a unit radar, the phased array radar has the capability of constructing a beam forming network by controlling phases among different unit radars, but for the broadband phased array radar, a beam tilting phenomenon caused by an electric phase shifting network exists, and the broadband microwave photon phased array radar can effectively solve the problem by utilizing true optical delay, so that the beam pointing angle of a system is not changed along with the frequency when the system transmits or receives broadband signals.
The receiving of the broadband microwave photon phased array radar comprises two functional modules of an Optical control beam forming network (OBFN) and a photon ADC (Photonic Analog-to-digital Converter, PADC), wherein a receiver firstly utilizes a plurality of receiving antennas to receive echoes, then the echoes are converted into an Optical domain through an electric domain, the construction of the beam forming network is completed through a delay unit in the Optical domain, then the echoes are converted into the electric domain through an Optical domain through a photoelectric detector, then the electric signals are subjected to electro-Optical conversion again, the operations such as sampling, quantification and the like are completed by the photon ADC, the advantages of high frequency, low time jitter, large bandwidth and the like of light are fully exerted, the problems that the traditional electric ADC cannot meet the requirements of the system for high sampling rate and high signal-to-noise ratio and the like and is easily influenced by aperture jitter factors are solved, down-conversion is realized while the high sampling rate is realized, and the electric ADC (Electronic Analog-to-digital Converter is reduced, EADC), and the like, and then enters the data processing unit after being converted into an electrical domain.
Therefore, when the receiver is used for realizing all-optical processing of signals by cascading two functional modules, namely the optical control beam forming network and the photonic ADC, multiple times of electrical/optical and optical/electrical conversion are required, and due to the photoelectric conversion efficiency, about 30dB of loss inevitably exists, so that the overall performance of the system is deteriorated.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a broadband radar signal receiving apparatus with integrated OBFN and PADC functions, which can reduce the loss introduced by multiple photoelectric conversion, and integrate the functions of the two modules of the optical beam forming network and the photonic ADC.
Another objective of the present invention is to provide a method for receiving broadband radar signals with integrated OBFN and PADC functions.
In order to achieve the above object, an embodiment of the present invention provides a broadband radar signal receiving apparatus with integrated OBFN and PADC functions, including: the system comprises an antenna array unit, an OBFN and PADC all-optical function integrated unit, an optical pulse unit, a photoelectric conversion unit, an electric ADC unit and a digital signal processing unit;
the output end of the antenna array unit is connected with the microwave input end of the all-optical function integrated unit of the OBFN and PADC, and the antenna array unit is used for receiving multiple paths of target echo signals and sending the multiple paths of target echo signals to the all-optical function integrated unit of the OBFN and PADC;
the output end of the optical pulse unit is connected with the optical input end of the all-optical function integrated unit of the OBFN and PADC, and the optical pulse unit is used for generating a high-frequency repeated optical pulse string and sending the high-frequency repeated optical pulse string to the all-optical function integrated unit of the OBFN and PADC;
the output end of the all-optical function integrated unit of the OBFN and PADC is connected with the input end of the photoelectric conversion unit;
the all-optical function integration unit of the OBFN and PADC is used for performing all-optical sampling on the multiple paths of target echo signals by using the high-frequency repetitive optical pulse string to realize electro-optical conversion, performing space-time antisymmetric conversion on all-optical pulses before and after sampling to construct an optically controlled beam forming network, performing down-sampling on the sampled multiple paths of target echo signals to realize the integration of optically controlled beam forming and a photon ADC function, performing multi-wavelength demultiplexing on the down-sampled multiple paths of target echo signals to divide the signals into single-wavelength branches, and sending the single-wavelength branches to the photoelectric conversion unit;
the output end of the photoelectric conversion unit is connected with the input end of the electric ADC unit and is used for performing photoelectric conversion on each single-wavelength branch and sending each single-wavelength branch signal after photoelectric conversion to the electric ADC unit;
the output end of the electric ADC unit is connected with the input end of the digital signal processing unit and is used for quantizing each single-wavelength branch signal after photoelectric conversion and sending each quantized single-wavelength branch signal to the digital signal processing unit;
and the digital signal processing unit is used for synthesizing broadband signals of the quantized single-wavelength branch signals and generating a broadband radar beam directional diagram with a preset beam pointing angle.
The broadband radar signal receiving device integrating OBFN and PADC functions is based on the all-optical processing theory of time-space two-dimensional microwave signals, echo signals are subjected to all-optical sampling through multi-wavelength high-frequency repeated optical pulses, the OBFN and PADC functions of the broadband radar signals can be simultaneously completed through space-time antisymmetric transformation, and all-optical function integrated receiving is achieved. The device can realize spectrum compatible cascade sharing in an optical domain, and can construct a beam forming network while reducing the requirement on the bandwidth of an electric ADC (analog to digital converter) only by once electric/optical and optical/electric conversion, so that a target is detected in a specified direction, the system power loss of about 30dB is reduced, and the all-optical function integration is realized.
In addition, the broadband radar signal receiving device with integrated OBFN and PADC functions according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the bandwidth of the target echo signal is B, and the repetition frequency fs of the high-frequency repetitive optical pulse train satisfies a corresponding band-pass sampling theorem.
Further, in one embodiment of the present invention, the optical pulse unit includes: the device comprises a multi-wavelength high-frequency optical pulse array and a first delay array;
the output end of the multi-wavelength high-frequency optical pulse array is connected with the input end of the first delay array, and the output end of the first delay array is connected with the input end of the all-optical function integrated unit of the OBFN and the PADC;
the multi-wavelength high-frequency optical pulse array is used for generating N paths of high-frequency repetitive optical pulse trains, each path of optical pulse train contains M wavelengths, wherein M, N is a positive integer, and N is the array element number of the broadband radar signal receiving device;
the first delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles.
Further, in an embodiment of the present invention, the all-optical functional integrated unit of the OBFN and the PADC includes: the modulator array, the second delay array and the NxM demultiplexer;
the output end of the antenna array unit is connected with the microwave input end of the modulator array, the output end of the modulator array is connected with the input end of the second delay array, and the output end of the second delay array is connected with the NxM demultiplexer;
the modulator array comprises N modulators, and the modulation rate of each modulator is greater than the highest frequency of the target echo signal;
the second delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles;
the NxM demultiplexer performs multi-wavelength demultiplexing on the down-sampled multi-path target echo signals and divides the multi-path target echo signals into the single-wavelength branches, and the optical wavelength corresponding to each branch corresponds to each optical wavelength of the optical pulse unit.
Further, in one embodiment of the present invention, the photoelectric conversion unit includes: an array of photodetectors;
the response rate of the photodetector array is greater than the highest frequency of the bandwidth of the target echo signal after down-sampling.
Further, in one embodiment of the present invention, the electrical ADC unit includes: a low speed ADC array;
the low-speed ADC array comprises a plurality of EADCs, and the bandwidth of the low-speed ADC array is greater than or equal to the highest frequency of the bandwidth of the target echo signal after down-sampling.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a method for receiving a wideband radar signal with integrated OBFN and PADC functions, including:
receiving multi-path target echo signals through a receiving antenna array;
the high-frequency repetitive optical pulse string is used for carrying out all-optical sampling on the multi-channel target echo signals to realize electro-optical conversion, and space-time antisymmetric transformation of all-optical pulses is carried out before and after sampling to construct a light-controlled beam forming network, and the sampled multi-channel target echo signals are subjected to down-sampling to realize light-controlled beam forming and photonic ADC function integration;
carrying out multi-wavelength demultiplexing on the multi-path target echo signals subjected to down sampling to divide the multi-path target echo signals into single-wavelength branches;
performing photoelectric conversion on each single-wavelength branch, and quantizing each single-wavelength branch signal after the photoelectric conversion;
and synthesizing the broadband signals of the quantized single-wavelength branch signals, and generating a broadband radar beam directional diagram with a preset beam pointing angle.
According to the broadband radar signal receiving method integrating OBFN and PADC functions, based on the all-optical processing theory of time-space two-dimensional microwave signals, echo signals are subjected to all-optical sampling through multi-wavelength high-frequency repeated optical pulses, the OBFN and PADC functions of the broadband radar signals can be simultaneously completed through space-time anti-symmetric transformation, and all-optical function integrated receiving is achieved. The method can realize spectrum compatible cascade sharing in the optical domain, and can construct a beam forming network while reducing the requirement on the bandwidth of the electric ADC only by once electric/optical and optical/electric conversion, so as to detect a target in a specified direction, reduce the system power loss of about 30dB and realize all-optical function integration.
In addition, the broadband radar signal receiving method with integrated OBFN and PADC functions according to the above embodiments of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the bandwidth of the target echo signal is B, and the repetition frequency fs of the high-frequency repetitive optical pulse train satisfies a corresponding band-pass sampling theorem.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a broadband radar signal receiving apparatus with integrated OBFN and PADC functions according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an OBFN and PADC integrated broadband radar signal receiving apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a plenoptic sampling spectrum according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating simulation results according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for receiving a wideband radar signal with integrated OBFN and PADC functions according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An OBFN and PADC integrated broadband radar signal receiving apparatus and method according to an embodiment of the present invention are described below with reference to the accompanying drawings.
First, a broadband radar signal receiving apparatus with integrated OBFN and PADC functions according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a broadband radar signal receiving apparatus with integrated OBFN and PADC functions according to an embodiment of the present invention.
As shown in fig. 1, the broadband radar signal receiving apparatus with integrated OBFN and PADC functions includes: the device comprises an antenna array unit, an OBFN and PADC all-optical function integrated unit, an optical pulse unit, a photoelectric conversion unit, an electric ADC unit and a digital signal processing unit.
Furthermore, the output end of the antenna array unit is connected with the microwave input end of the all-optical function integrated unit of the OBFN and PADC, and the antenna array unit is used for receiving multiple paths of target echo signals and sending the multiple paths of target echo signals to the all-optical function integrated unit of the OBFN and the PADC.
Specifically, the antenna array unit of the broadband radar signal receiving device comprises a plurality of antenna array receiving units, and the plurality of antenna array receiving units are used for receiving multipath target echo signals.
Further, the output end of the optical pulse unit is connected with the optical input end of the all-optical function integrated unit of the OBFN and the PADC, and the optical pulse unit is used for generating a high-frequency repetitive optical pulse string and sending the high-frequency repetitive optical pulse string to the all-optical function integrated unit of the OBFN and the PADC.
Specifically, as shown in fig. 2, a schematic diagram of a high-frequency repetitive optical pulse train is shown. And if the bandwidth of the received echo signal is B, performing time division multiplexing on the high-frequency repetitive optical pulse string consisting of M paths of wavelengths to generate an optical pulse string with the repetition frequency fs, wherein the repetition frequency fs of the high-frequency repetitive optical pulse string meets the band-pass sampling theorem. The optical pulse unit sends an optical pulse string with the repetition frequency fs to the optical input end of the all-optical function integrated unit of the OBFN and PADC to perform optical domain signal processing.
Further, the output ends of the all-optical function integrated units of the OBFN and the PADC are connected with the input end of the photoelectric conversion unit; the all-optical function integration unit of the OBFN and the PADC is used for carrying out all-optical sampling on the multi-path target echo signals by utilizing a high-frequency repetitive optical pulse string so as to realize electro-optical conversion, carrying out space-time antisymmetric conversion on all-optical pulses before and after sampling, constructing a light-controlled beam forming network, carrying out down-sampling on the sampled multi-path target echo signals, realizing light-controlled beam forming and photon ADC function integration, carrying out multi-wavelength demultiplexing on the down-sampled multi-path target echo signals to divide the multi-wavelength demultiplexing into single-wavelength branches, and sending the single-wavelength branches into the photoelectric conversion unit.
The output end of the photoelectric conversion unit is connected with the input end of the electric ADC unit and used for performing photoelectric conversion on each single-wavelength branch and sending each single-wavelength branch signal after photoelectric conversion into the electric ADC unit.
Specifically, an all-optical functional integration unit of the OBFN and the PADC performs all-optical sampling on echo signals received by the antenna array unit, so as to realize conversion from an electrical domain to an optical domain, perform space-time antisymmetric conversion of all-optical pulses before and after sampling, construct a light-controlled beam forming network, perform down-sampling on broadband signals, and realize functional integration of the OBFN and the PADC.
Optical signals at the rear end of the all-optical function integrated unit of the OBFN and PADC enter the photoelectric conversion unit after being divided into single-wavelength branches through multi-wavelength demultiplexing, so that the conversion from an optical domain to an electrical domain is realized, and the bandwidth of signals to be processed by each branch is reduced to B/M.
Furthermore, the output end of the electric ADC unit is connected with the input end of the digital signal processing unit and is used for quantizing each single-wavelength branch signal after photoelectric conversion and sending each quantized single-wavelength branch signal to the digital signal processing unit; and the digital signal processing unit is used for synthesizing broadband signals of the quantized single-wavelength branch signals and generating a broadband radar beam directional diagram with a preset beam pointing angle.
Specifically, the electric ADC unit quantizes each path of signal output by the photoelectric conversion unit, the processing bandwidth is B/M, the output signal of the M-path electric ADC unit enters the data processing unit to complete the synthesis of the broadband signal, and finally the integration of the OBFN and the PADC is realized, and the beam pointing angle theta is obtained0The broadband radar beam pattern avoids high loss caused by multiple optical/electrical and electrical/optical conversion.
In summary, the embodiment of the invention overcomes the problem of high loss caused by multiple times of electrical/optical and optical/electrical conversion in the full-optical reception of the broadband microwave photonic phased array radar, integrates the light-controlled beam forming and the photonic ADC function, firstly, samples a plurality of received echo signals of the broadband microwave photonic phased array radar by using multi-wavelength high-frequency repetitive optical pulses, completes space-time antisymmetric transformation of full-optical pulse signals in an optical domain, constructs a light-controlled beam forming network, and realizes the light-controlled beam forming of broadband radar signals and the full-optical function integrated reception of the photonic ADC by using low-speed electrical ADC processing after multi-wavelength demultiplexing, and is applied to the radar field, and can effectively and quickly find targets in various directions.
The following describes a wideband radar signal receiving apparatus for implementing OBFN and PADC function integration, as shown in fig. 3, including: the device comprises a multi-wavelength high-frequency optical pulse array, a time delay array, a receiving antenna array, a modulator array, an NxM demultiplexer, a photoelectric detector array, a low-speed ADC array and a DSP unit.
Further, in one embodiment of the present invention, the light pulse unit includes: the device comprises a multi-wavelength high-frequency optical pulse array and a first delay array;
the output end of the multi-wavelength high-frequency optical pulse array is connected with the input end of a first delay array, and the output end of the first delay array is connected with the input ends of all-optical function integrated units of the OBFN and the PADC;
the multi-wavelength high-frequency optical pulse array is used for generating N paths of high-frequency repetitive optical pulse strings, each path of optical pulse string contains M wavelengths, the M wavelengths form the high-frequency repetitive optical pulse strings after time division multiplexing, the repetition frequency of the high-frequency repetitive optical pulse strings meets the band-pass sampling theorem, wherein M, N is a positive integer, and N is the array element number of the broadband radar signal receiving device;
the first delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles.
Further, in an embodiment of the present invention, an all-optical functional integrated unit of an OBFN and a PADC includes: the modulator array, the second delay array and the NxM demultiplexer;
the output end of the antenna array unit is connected with the microwave input end of the modulator array, the output end of the modulator array is connected with the input end of the second delay array, and the output end of the second delay array is connected with the NxM demultiplexer;
the modulator array comprises N modulators, and the modulation rate of each modulator is greater than the highest frequency of a target echo signal;
the second delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles;
the NxM demultiplexer performs multi-wavelength demultiplexing on the down-sampled multi-path target echo signals to divide the signals into single-wavelength branches, and the optical wavelength corresponding to each branch corresponds to each optical wavelength of the optical pulse unit.
Further, in one embodiment of the present invention, a photoelectric conversion unit includes: an array of photodetectors;
the response rate of the photodetector array is greater than the highest frequency of the bandwidth of the target echo signal after down-sampling.
Further, in one embodiment of the present invention, an electrical ADC unit, comprising: a low speed ADC array;
the low-speed ADC array comprises a plurality of EADCs, and the bandwidth of the low-speed ADC array is more than or equal to the highest frequency of the bandwidth of the target echo signal after down sampling, namely 1/M of the bandwidth of the original signal.
As shown in FIG. 4, for example, a 4-element radar is used to specify a beam pointing angle θ0The receiving echo signal is a chirp signal of 8-12 GHz, T is 10 mus, and the bandwidth B is 4GHz, thus realizing a broadband radar signal receiving device integrating light-controlled beam forming and photon ADC functions. The repetition frequency fs of the optical pulse train is 8GHz, the repetition frequency fs/2 of the optical pulse train with single wavelength is 4GHz, the processing bandwidth of the two-path electric ADC is reduced to 2GHz, and the beam pointing angle theta is finally obtained after data processing0A pattern of 30 °.
According to the broadband radar signal receiving device integrating the OBFN and the PADC functions, based on the all-optical processing theory of time-space two-dimensional microwave signals, echo signals are subjected to all-optical sampling through multi-wavelength high-frequency repeated optical pulses, the OBFN and the PADC functions of the broadband radar signals can be simultaneously completed through space-time antisymmetric transformation, and all-optical function integrated receiving is achieved. The device can realize spectrum compatible cascade sharing in an optical domain, and can construct a beam forming network while reducing the requirement on the bandwidth of an electric ADC (analog to digital converter) only by once electric/optical and optical/electric conversion, so that a target is detected in a specified direction, the system power loss of about 30dB is reduced, and the all-optical function integration is realized.
Next, a method for receiving a broadband radar signal with integrated OBFN and PADC functions according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 5 is a flowchart of a method for receiving a wideband radar signal with integrated OBFN and PADC functions according to an embodiment of the present invention.
As shown in fig. 5, the method for receiving a wideband radar signal with integrated OBFN and PADC functions includes the following steps:
and S1, receiving the multipath target echo signals through the receiving antenna array.
S2, full-optical sampling is carried out on the multi-channel target echo signals by using the high-frequency repetitive optical pulse string to realize electro-optical conversion, space-time anti-symmetric transformation of full-optical pulses is carried out before and after sampling, a light-controlled beam forming network is constructed, down-sampling is carried out on the sampled multi-channel target echo signals, and integration of light-controlled beam forming and a photon ADC function is realized.
And S3, performing multi-wavelength demultiplexing on the down-sampled multi-path target echo signals to divide the signals into single-wavelength branches.
S4, performing photoelectric conversion on each single-wavelength branch, and quantizing each single-wavelength branch signal after photoelectric conversion.
And S5, synthesizing the broadband signals of the quantized single-wavelength branch signals, and generating a broadband radar beam directional diagram with a preset beam pointing angle.
Further, in an embodiment of the present invention, the bandwidth of the target echo signal is B, and the repetition frequency fs of the high-frequency repetitive optical pulse train satisfies the band-pass sampling theorem.
It should be noted that the foregoing explanation of the embodiment of the wideband radar signal receiving apparatus with integrated OBFN and PADC functions also applies to the method of the embodiment, and is not repeated herein.
According to the broadband radar signal receiving method integrating the OBFN and the PADC functions, based on the all-optical processing theory of time-space two-dimensional microwave signals, echo signals are subjected to all-optical sampling through multi-wavelength high-frequency repeated optical pulses, the OBFN and the PADC functions of the broadband radar signals can be simultaneously completed through space-time antisymmetric transformation, and all-optical function integrated receiving is achieved. The method can realize spectrum compatible cascade sharing in the optical domain, and can construct a beam forming network while reducing the requirement on the bandwidth of the electric ADC only by once electric/optical and optical/electric conversion, so as to detect a target in a specified direction, reduce the system power loss of about 30dB and realize all-optical function integration.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. An OBFN and PADC functional integrated broadband radar signal receiving device, comprising: the system comprises an antenna array unit, an OBFN and PADC all-optical function integrated unit, an optical pulse unit, a photoelectric conversion unit, an electric ADC unit and a digital signal processing unit;
the output end of the antenna array unit is connected with the microwave input end of the all-optical function integrated unit of the OBFN and PADC, and the antenna array unit is used for receiving multiple paths of target echo signals and sending the multiple paths of target echo signals to the all-optical function integrated unit of the OBFN and PADC;
the output end of the optical pulse unit is connected with the optical input end of the all-optical function integrated unit of the OBFN and PADC, and the optical pulse unit is used for generating a high-frequency repeated optical pulse string and sending the high-frequency repeated optical pulse string to the all-optical function integrated unit of the OBFN and PADC;
the output end of the all-optical function integrated unit of the OBFN and PADC is connected with the input end of the photoelectric conversion unit;
the all-optical function integration unit of the OBFN and PADC is used for performing all-optical sampling on the multiple paths of target echo signals by using the high-frequency repetitive optical pulse string to realize electro-optical conversion, performing space-time antisymmetric conversion on all-optical pulses before and after sampling to construct an optically controlled beam forming network, performing down-sampling on the sampled multiple paths of target echo signals to realize the integration of optically controlled beam forming and a photon ADC function, performing multi-wavelength demultiplexing on the down-sampled multiple paths of target echo signals to divide the signals into single-wavelength branches, and sending the single-wavelength branches to the photoelectric conversion unit;
the output end of the photoelectric conversion unit is connected with the input end of the electric ADC unit and is used for performing photoelectric conversion on each single-wavelength branch and sending each single-wavelength branch signal after photoelectric conversion to the electric ADC unit;
the output end of the electric ADC unit is connected with the input end of the digital signal processing unit and is used for quantizing each single-wavelength branch signal after photoelectric conversion and sending each quantized single-wavelength branch signal to the digital signal processing unit;
and the digital signal processing unit is used for synthesizing broadband signals of the quantized single-wavelength branch signals and generating a broadband radar beam directional diagram with a preset beam pointing angle.
2. The OBFN and PADC functional integrated broadband radar signal receiving device of claim 1,
the bandwidth of the target echo signal is B, and the repetition frequency fs of the high-frequency repetitive optical pulse train meets the corresponding band-pass sampling theorem.
3. The apparatus of claim 1, wherein the optical pulse unit comprises: the device comprises a multi-wavelength high-frequency optical pulse array and a first delay array;
the output end of the multi-wavelength high-frequency optical pulse array is connected with the input end of the first delay array, and the output end of the first delay array is connected with the input end of the all-optical function integrated unit of the OBFN and the PADC;
the multi-wavelength high-frequency optical pulse array is used for generating N paths of high-frequency repetitive optical pulse trains, each path of optical pulse train contains M wavelengths, wherein M, N is a positive integer, and N is the array element number of the broadband radar signal receiving device;
the first delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles.
4. The OBFN and PADC functional integrated broadband radar signal receiving device according to claim 1, wherein the OBFN and PADC all-optical functional integrated unit comprises: the modulator array, the second delay array and the NxM demultiplexer;
the output end of the antenna array unit is connected with the microwave input end of the modulator array, the output end of the modulator array is connected with the input end of the second delay array, and the output end of the second delay array is connected with the NxM demultiplexer;
the modulator array comprises N modulators, and the modulation rate of each modulator is greater than the highest frequency of the target echo signal;
the second delay array comprises N branches and is used for adjusting delay of each branch according to different beam pointing angles;
the NxM demultiplexer performs multi-wavelength demultiplexing on the down-sampled multi-path target echo signals and divides the multi-path target echo signals into the single-wavelength branches, and the optical wavelength corresponding to each branch corresponds to each optical wavelength of the optical pulse unit.
5. The apparatus of claim 1, wherein the OBFN and PADC functional integrated broadband radar signal receiving unit comprises: an array of photodetectors;
the response rate of the photodetector array is greater than the highest frequency of the bandwidth of the target echo signal after down-sampling.
6. The OBFN broadband radar signal receiving device with integrated PADC functionality of claim 1, wherein the electrical ADC unit comprises: a low speed ADC array;
the low-speed ADC array comprises a plurality of EADCs, and the bandwidth of the low-speed ADC array is greater than or equal to the highest frequency of the bandwidth of the target echo signal after down-sampling.
7. An OBFN and PADC function integrated broadband radar signal receiving method is characterized by comprising the following steps:
receiving multi-path target echo signals through a receiving antenna array;
the high-frequency repetitive optical pulse string is used for carrying out all-optical sampling on the multi-channel target echo signals to realize electro-optical conversion, and space-time antisymmetric transformation of all-optical pulses is carried out before and after sampling to construct a light-controlled beam forming network, and the sampled multi-channel target echo signals are subjected to down-sampling to realize light-controlled beam forming and photonic ADC function integration;
carrying out multi-wavelength demultiplexing on the multi-path target echo signals subjected to down sampling to divide the multi-path target echo signals into single-wavelength branches;
performing photoelectric conversion on each single-wavelength branch, and quantizing each single-wavelength branch signal after the photoelectric conversion;
and synthesizing the broadband signals of the quantized single-wavelength branch signals, and generating a broadband radar beam directional diagram with a preset beam pointing angle.
8. The OBFN and PADC functional integrated broadband radar signal receiving method of claim 7,
the bandwidth of the target echo signal is B, and the repetition frequency fs of the high-frequency repetitive optical pulse train meets the corresponding band-pass sampling theorem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025559.5A CN111142089B (en) | 2020-01-10 | 2020-01-10 | OBFN and PADC function integrated broadband radar signal receiving device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025559.5A CN111142089B (en) | 2020-01-10 | 2020-01-10 | OBFN and PADC function integrated broadband radar signal receiving device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111142089A true CN111142089A (en) | 2020-05-12 |
| CN111142089B CN111142089B (en) | 2021-09-21 |
Family
ID=70524354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010025559.5A Active CN111142089B (en) | 2020-01-10 | 2020-01-10 | OBFN and PADC function integrated broadband radar signal receiving device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111142089B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030929A (en) * | 2021-02-09 | 2021-06-25 | 清华大学 | Broadband radar signal receiving device and receiving method |
| CN113612556A (en) * | 2021-07-28 | 2021-11-05 | 清华大学 | Integrated multi-node spectrum sensing method and device |
| CN114614904A (en) * | 2022-03-11 | 2022-06-10 | 清华大学 | Signal generating device and method integrating PAWG and OBFN functions |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359962A (en) * | 2008-09-19 | 2009-02-04 | 清华大学 | Filter feedback multiplexed millimeter wave subcarrier optical controlled microwave beam forming network |
| US20180106904A1 (en) * | 2015-08-17 | 2018-04-19 | Shanghai Jiao Tong University | Full-spectrum covering ultra wideband all photonics-based radar system |
| CN109085546A (en) * | 2018-08-21 | 2018-12-25 | 上海交通大学 | Phased-array radar reception device based on the sampling of photon parameter |
-
2020
- 2020-01-10 CN CN202010025559.5A patent/CN111142089B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359962A (en) * | 2008-09-19 | 2009-02-04 | 清华大学 | Filter feedback multiplexed millimeter wave subcarrier optical controlled microwave beam forming network |
| US20180106904A1 (en) * | 2015-08-17 | 2018-04-19 | Shanghai Jiao Tong University | Full-spectrum covering ultra wideband all photonics-based radar system |
| CN109085546A (en) * | 2018-08-21 | 2018-12-25 | 上海交通大学 | Phased-array radar reception device based on the sampling of photon parameter |
Non-Patent Citations (4)
| Title |
|---|
| FILIPPO SCOTTI 等: "Tracking of a naval target with a dual-band photonic-based coherent radar system", 《2016 IEEE RADAR CONFERENCE (RADARCONF)》 * |
| PAN SHILONG 等: "《 Transactions of Nanjing University of Aeronautics and Astronautics》", 《MICROWAVE PHOTONICS FOR MODERN RADAR SYSTEMS》 * |
| ZERIHUN GEDEB TEGEGNE 等: "Single Channel Microwave Photonics Digital Beamforming Radar Imaging System", 《JOURNAL OF LIGHTWAVE TECHNOLOGY 》 * |
| 李尚远 等: "基于微波光子学的分布式相参孔径雷达", 《雷达学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030929A (en) * | 2021-02-09 | 2021-06-25 | 清华大学 | Broadband radar signal receiving device and receiving method |
| CN113612556A (en) * | 2021-07-28 | 2021-11-05 | 清华大学 | Integrated multi-node spectrum sensing method and device |
| CN114614904A (en) * | 2022-03-11 | 2022-06-10 | 清华大学 | Signal generating device and method integrating PAWG and OBFN functions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111142089B (en) | 2021-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111142089B (en) | OBFN and PADC function integrated broadband radar signal receiving device and method | |
| CN108535699B (en) | Microwave photon digital beam forming method and device and broadband digital array radar | |
| CN108761439B (en) | Integrated multi-beam optical phased array delay network based on wavelength division multiplexing | |
| Rotman et al. | True time delay in phased arrays | |
| CN111181683B (en) | Device and design method of ultra-wideband receiver based on microwave photons | |
| Longbrake | True time-delay beamsteering for radar | |
| CN102646874B (en) | Four-dimensional antenna array based on single-pole multi-throw switch | |
| CN113067635B (en) | Transmit-receive integrated phased array beam synthesis device based on integrated optical delay chip | |
| WO2017028335A1 (en) | Ultra-wide-band all-optical radar system covering all wavebands | |
| CN113030929B (en) | Broadband radar signal receiving device and receiving method | |
| CN112099048B (en) | Microwave photon MIMO radar detection method and system based on time division-difference frequency multiplexing | |
| CN111370873B (en) | High-efficiency phase modulation system based on time modulation array | |
| US7053814B2 (en) | RF lightwave coding system for radar pulse compression | |
| CN110611169B (en) | Phased array antenna system based on periodic phase modulation and application method thereof | |
| CN110501779B (en) | Micro-ring delay matrix and microwave photon integrated multi-beam phased array chip and system | |
| CN114280588A (en) | Microwave photon multi-band array radar implementation method and system | |
| CN113608228B (en) | Quick scanning device and method for two-dimensional multi-beam laser radar based on blast matrix | |
| Raz et al. | Wavelength-controlled photonic true time delay for wide-band applications | |
| CN113571908B (en) | Two-dimensional reconfigurable light-operated beam forming network device shared by transceiver | |
| CN114296033A (en) | Light-operated receiving beam forming method and device | |
| Serafino et al. | A photonic beamforming network based on phase shifters for microwave wide-band applications | |
| Sreenivasulu et al. | Evolutionary trends in true time delay line technologies for timed array radars | |
| Yan et al. | Design and implementation of optical true time delay in optically controlled phased array antennas | |
| CN113376622B (en) | Millimeter wave phased array radar with low link loss and detection method thereof | |
| CN113949456A (en) | Numerical control light beam synthesis chip device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |