CN110350980B - Radar detection method and device based on bandwidth synthesis after microwave photon-assisted deskew - Google Patents
Radar detection method and device based on bandwidth synthesis after microwave photon-assisted deskew Download PDFInfo
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Abstract
The invention discloses a radar detection method based on bandwidth synthesis after microwave photon-assisted deskew. Converting 2n intermediate frequency linear frequency modulation electrical signals to n paths of orthogonal polarization states with different wavelengths in an optical domain for m frequency multiplication processing, and combining the n paths of optical signals into one path of optical signal to be transmitted to a transmitting end; at the transmitting end, the optical signal is divided into 2n paths, each path of signal is divided into two branches, one branch is radiated by a transmitting array element after being subjected to photoelectric conversion and amplification, and the other branch is used as an optical reference signal; and converting signals collected by the 2n receiving array elements into an optical domain for optical deskew processing, and performing time domain synthesis processing after photoelectric conversion to obtain a target detection result with equivalent large bandwidth. The invention also discloses a radar detection device based on the microwave photon-assisted deskew bandwidth synthesis. The invention effectively solves the problem of mismatching of optical broadband bearing and electric narrowband processing, and can realize real-time detection with equivalent large bandwidth and high distance resolution.
Description
Technical Field
The invention relates to a radar detection method, in particular to a microwave photon-assisted radar detection method and a microwave photon-assisted radar detection device.
Background
The radar is an important means for all-weather target detection and identification of human beings, and has extremely important application in the civil and military fields. In order to achieve detection with high range resolution, a chirp signal having a large bandwidth is widely used in a radar system. However, as the demand for resolution of radar systems increases, it is difficult for conventional radar technology to meet the demands of future applications. The application of microwave photon technology with the characteristics of large bandwidth, small transmission loss, electromagnetic interference resistance and the like to a radar system can improve the technical performance of the traditional radar (see [ G.Serafino, F.Scotti, L.Lembo, B.Hussain, C.Porzi, A.Malarane, S.Maresca, D.Oori, P.Ghelfi, and A.Bogoni, "heated a new generation of radio system based on microwave technologies," J.Lightw.Technolt.37 (2), 643-. However, sampling and pulse compression are directly performed on the chirp signal with an ultra-large bandwidth, which requires a high sampling rate and a strong signal processing capability, and is difficult to perform real-time processing.
Optical domain deskewing is a technical solution that can reduce the requirement of the radar system for high sampling rate in the currently reported microwave photonic radar (see [ f.zhang, q.guo, z.wang, p.zhou, g.zhang, j.sun, and s.pan, "Photonics-based broadband and radar for high-resolution and real-time inverting adaptation," opt.express 25(14), "16274 (2017) ]). However, in the case of remote detection, the deskew signal frequency of the large-bandwidth chirp signal is still high, so that a high requirement is imposed on the sampling rate, a high-frequency and large-bandwidth electronic device is required, and data is difficult to process in real time. Therefore, the research can improve the range resolution of the radar system under the condition of low sampling rate requirement, and is very significant for improving and improving the target detection capability.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a radar detection method based on microwave photon-assisted deskew bandwidth synthesis, has the advantages of the microwave photon technology and the bandwidth synthesis radar technology, can realize the rapid processing of equivalent large-bandwidth signals by using low-cost low-speed electronic devices, and realizes the purpose of real-time high-resolution detection.
The invention provides a radar detection method based on bandwidth synthesis after microwave photon-assisted deskew, which comprises the following steps:
2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slope and sequentially increased or decreased center frequency are used for respectively carrying out electro-optical modulation in m frequency multiplication mode on two orthogonal polarization states of n paths of optical signals with different wavelengths in a one-to-one correspondence mode, the obtained n paths of polarization multiplexing modulation optical signals are combined into one path and then sent to a transmitting end, and the bandwidth B of the ith intermediate frequency linear frequency modulation electric signal isiFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
at the transmitting end, wavelength demultiplexing and polarization demultiplexing are carried out on the combined optical signal, the 2n paths of separated modulated optical signals are divided into two paths, one path of modulated optical signals is subjected to photoelectric conversion to m frequency-doubled linear frequency modulation signals and then is radiated by a transmitting array element, and the other path of modulated optical signals is used as optical domain deskew received optical reference signals;
at a receiving end, the 2n optical reference signals are utilized to respectively perform optical domain deskew processing on echo signals collected by the 2n receiving array elements, and then 2n low-frequency deskew signals carrying target information are obtained through photoelectric conversion; performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f and delta f respectively according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal.
Preferably, the n polarization multiplexing modulated optical signals are obtained by n polarization division multiplexing modulators, and each polarization division multiplexing modulator modulates two intermediate frequency linear frequency modulation electrical signals onto two orthogonal polarization states of one path of optical signal respectively.
Further preferably, the partial division multiplexing modulator is a partial division multiplexing dual parallel mach-zehnder modulator.
Preferably, the optical domain deskewing is performed by a mach-zehnder modulator operating at a quadrature bias point.
The following technical scheme can be obtained according to the same invention concept:
radar detection device based on bandwidth synthesis after supplementary declivity of microwave photon includes:
an optical domain signal frequency doubling and multiplexing module, which is used for performing electro-optical modulation of m frequency doubling modes on two orthogonal polarization states of n paths of optical signals with different wavelengths respectively by using 2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slopes and sequentially increased or decreased central frequencies, combining the obtained n paths of polarization multiplexing modulation optical signals into one path and sending the path to a transmitting end, wherein the bandwidth B of the ith intermediate frequency linear frequency modulation electric signaliFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
the optical domain demultiplexing module is positioned at the transmitting end and used for carrying out wavelength demultiplexing and polarization demultiplexing on the combined optical signal, dividing the 2n paths of separated modulated optical signals into two paths, carrying out photoelectric conversion on one path of modulated optical signals into m frequency-doubled linear frequency signals, radiating the m frequency-doubled linear frequency signals by a transmitting array element, and taking the other path of modulated optical signals as optical domain deskew received optical reference signals;
the optical domain deskew receiving module is positioned at a receiving end and used for respectively carrying out optical domain deskew processing on echo signals collected by the 2n receiving array elements by utilizing the 2n optical reference signals and then obtaining 2n low-frequency deskew signals carrying target information through photoelectric conversion;
a digital bandwidth synthesis module for performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal.
Preferably, the optical domain signal frequency doubling and multiplexing module includes n polarization division multiplexing modulators, and each polarization division multiplexing modulator modulates two intermediate frequency linear frequency modulation electrical signals onto two orthogonal polarization states of one path of optical signal respectively.
Further preferably, the partial division multiplexing modulator is a partial division multiplexing dual parallel mach-zehnder modulator.
Preferably, the optical domain deskew receiving module comprises 2n mach-zehnder modulators operating at a quadrature bias point.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention utilizes the low-speed electronic device to rapidly synthesize and process the deskew signals, realizes the processing of equivalent large-bandwidth signals, reduces the requirement of the system on the sampling rate, and can effectively solve the problem that the optical broadband bearing is not matched with the electric narrowband processing, thereby obtaining the real-time high-resolution detection result; 2. the invention adopts the optical wavelength division multiplexing and polarization division multiplexing technologies to transmit and process the multi-channel signals, can realize a more compact structure and reduce the system cost.
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FIG. 1 is a schematic structural diagram of a radar detection device based on bandwidth synthesis after microwave photon-assisted deskew according to the present invention;
fig. 2 is a schematic structural diagram of a preferred embodiment of the radar detection device of the present invention.
FIG. 3 is a schematic diagram of bandwidth synthesis;
fig. 4 is a diagram showing comparison between the effects before and after bandwidth synthesis.
Detailed Description
Aiming at the defects of the prior art, the invention uses the characteristics of large bandwidth, low loss, multiple parallel processing freedom degrees and the like of the microwave photon technology to combine the characteristics of linear frequency modulation waves and uses low-cost low-speed electronic devices to synthesize and process deskew signals so as to solve the bottleneck of the working bandwidth of the traditional radar and realize real-time high-resolution detection.
The invention provides a radar detection method based on bandwidth synthesis after microwave photon-assisted deskew, which comprises the following steps:
2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slope and sequentially increased or decreased center frequency are used for respectively carrying out electro-optical modulation in m frequency multiplication mode on two orthogonal polarization states of n paths of optical signals with different wavelengths in a one-to-one correspondence mode, the obtained n paths of polarization multiplexing modulation optical signals are combined into one path and then sent to a transmitting end, and the bandwidth B of the ith intermediate frequency linear frequency modulation electric signal isiFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
at the transmitting end, wavelength demultiplexing and polarization demultiplexing are carried out on the combined optical signal, the 2n paths of separated modulated optical signals are divided into two paths, one path of modulated optical signals is subjected to photoelectric conversion to m frequency-doubled linear frequency modulation signals and then is radiated by a transmitting array element, and the other path of modulated optical signals is used as optical domain deskew received optical reference signals;
at a receiving end, the 2n optical reference signals are utilized to respectively perform optical domain deskew processing on echo signals collected by the 2n receiving array elements, and then 2n low-frequency deskew signals carrying target information are obtained through photoelectric conversion; performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f and delta f respectively according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal.
Fig. 1 shows a basic structure of a radar detection device of the present invention, in which a dotted line indicates an electric signal and a solid line indicates an optical signal. As shown in fig. 1, the radar detection device of the present invention includes:
an optical domain signal frequency doubling and multiplexing module for one-to-one correspondence of two orthogonal polarization states of n paths of optical signals with different wavelengths by 2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slopes and sequentially increased or decreased center frequenciesThe electro-optical modulation of m frequency multiplication modes is respectively carried out, the obtained n paths of polarization multiplexing modulation optical signals are combined into one path and then are sent to a transmitting end, and the bandwidth B of the ith intermediate frequency linear frequency modulation electrical signaliFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
the optical domain demultiplexing module is positioned at the transmitting end and used for carrying out wavelength demultiplexing and polarization demultiplexing on the combined optical signal, dividing the 2n paths of separated modulated optical signals into two paths, carrying out photoelectric conversion on one path of modulated optical signals into m frequency-doubled linear frequency signals, radiating the m frequency-doubled linear frequency signals by a transmitting array element, and taking the other path of modulated optical signals as optical domain deskew received optical reference signals;
the optical domain deskew receiving module is positioned at a receiving end and used for respectively carrying out optical domain deskew processing on echo signals collected by the 2n receiving array elements by utilizing the 2n optical reference signals and then obtaining 2n low-frequency deskew signals carrying target information through photoelectric conversion;
a digital bandwidth synthesis module for performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal.
The optical domain signal frequency doubling and multiplexing module comprises n partial division multiplexing modulators, and each partial division multiplexing modulator modulates two intermediate frequency linear frequency modulation electric signals on two orthogonal polarization states of one path of optical signal respectively. The working mode of the modulator can be controlled by adjusting the bias point of the bias division multiplexing modulator, and the frequency multiplication times m can be further adjusted. The polarization multiplexing modulator can be a polarization division multiplexing double-parallel Mach-Zehnder modulator or a polarization division multiplexing Mach-Zehnder modulator, and the like, and the polarization division multiplexing double-parallel Mach-Zehnder modulator is preferably adopted in the invention.
For the understanding of the public, the technical solution of the present invention is further described in detail by a specific embodiment as follows:
the specific structure of this embodiment is shown in fig. 2, and the optical domain signal frequency doubling and multiplexing module (including a laser, a polarization division multiplexing dual-parallel mach-zehnder modulator and a light wavelength division multiplexer), an optical domain demultiplexing module (including a light wavelength division multiplexer, a polarization beam splitter, a coupler, and a photodetector), an optical domain deskew receiving module (including a mach-zehnder modulator and a photodetector), a digital bandwidth synthesizing module, an optical amplifier, a power amplifier, a low noise amplifier, and a transceiver array element constitute the optical domain deskew receiving module. The chirp signal in fig. 2 is generated by an electrical signal generator.
First, optical carriers with different wavelengths generated by n lasers are input into a polarization-division multiplexing dual-parallel Mach-Zehnder modulator. The 2n intermediate frequency chirp signals generated by the electrical signal generator are used as driving signals, which can be expressed as:
wherein i is more than or equal to 1 and less than or equal to 2n and-Ti/2≤t≤Ti/2，Vs、fci、ki、TiRespectively, the amplitude, the center frequency, the frequency modulation slope and the pulse width of the signal; bandwidth B of signali＝kiTiCenter frequency spacing Δ fi＝fci+1－fci(ii) a Every two electrical intermediate frequency linear frequency modulation signals modulate two polarization states of one wavelength, so that 2n electrical intermediate frequency signals are converted into n paths of optical signals, and the n paths of optical signals are input into the optical wavelength division multiplexer and combined into 1 path of optical modulation signals. The combined optical signal enters an optical amplifier to be amplified and then is input into an optical domain demultiplexing module. The modulator can generate different sidebands by controlling the bias voltage of the modulator, namely, the modulator works in different frequency multiplication modes:
1 frequency doubling mode (m ═ 1): the two sub-modulators and the synthesis arms thereof in each polarization state are biased at an orthogonal point, and the ports of the two modulators are respectively connected with two paths of signals with 90-degree phase difference generated after the electrical intermediate frequency linear frequency modulation signals pass through a 90-degree microwave bridge; only the carrier and the +1 or-1 order sideband are reserved at this time;
2 frequency doubling mode (m ═ 2): the two sub-modulators on each polarization state are biased at the minimum point, the synthesis arm is biased at the maximum point, and the ports of the two modulators are respectively connected with the electrical intermediate frequency linear frequency modulation signals; only +1 and-1 order sidebands remain at this time;
4 frequency doubling mode (m ═ 4): the two sub-modulators on each polarization state are biased at the maximum working point, the synthesis arm is biased at the minimum point, and the ports of the two modulators are respectively connected with two paths of signals with 90-degree phase difference generated after the electrical intermediate frequency linear frequency modulation signals pass through a 90-degree microwave bridge; only the +2 and-2 order sidebands remain at this time.
In this embodiment, a 4-octave mode is taken as an example.
In the optical domain demultiplexing module, n optical signals with different wavelengths in the optical modulation signals are separated into n optical signals through an optical wavelength division multiplexer, and each optical signal passes through a polarization beam splitter, so that two orthogonal polarization states are separated into two polarization state branches, and finally 2n optical signals are separated. Each optical signal is divided into two branches by an optical coupler, one branch is provided for the optical domain deskew receiving module to be used as an optical reference signal, the other branch is converted into a 4-frequency-doubled electrical signal by a photoelectric detector, and the 4-frequency-doubled signal can be expressed as:
Ii(t)∝cos[2π(4fcit+2kit2)](2)
the 4 frequency-doubled signals are fed into the transmitting array element through the power amplifier and radiated to the environment containing the detection target.
The echo signal reflected by the target is received by a receiving array element, enters a low-noise amplifier for amplification, and the amplified echo signal modulates a reference light signal through a Mach-Zehnder modulator in an optical domain deskew receiving module, wherein the Mach-Zehnder modulator works at an orthogonal bias point. The output optical signal of the Mach-Zehnder modulator enters a low-frequency photoelectric detector to complete photoelectric conversion, so that the deskew is completed. Assuming that the delay of the echo signal is τ, the deskewed signal can be expressed as:
ri(t)cos{2π[4fciτ-2kiτ2+4kiτt]} (3)
for ease of understanding, two signals (i ═ 1,2) are taken as an example and are respectively represented as:
r1(t)＝cos{2π[4fc1τ-2k1τ2+4k1τt]} (4)
the two signals having the same chirp rate, i.e. k1＝k2Will signal r2(T) delay time T ═ Δ f1K, obtaining:
r2(t-T)＝cos{2π[4fc1τ-2k1τ2+4k1τt]} (6)
it can be seen that the expression patterns of the two formulas (4) and (6) are completely the same, and then the two signals can be spliced together. Similarly, the 2n deskew signals can be spliced into one signal after being correspondingly delayed.
After 2n signals are subjected to analog-to-digital conversion in a digital bandwidth synthesis module, the 1 st to 2n signals are respectively delayed by 0 and delta f through digital signal processing1/k，…，(Δf1+Δf2+…+Δf2n-1) K, and removing the overlapping portion, thereby synthesizing an equivalent bandwidth of m [ Δ f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]The deskew result of the chirp signal. Fig. 3 is a schematic diagram of the basic principle of bandwidth synthesis after microwave photon deskew, in which the waveform of the deskew signal is shown in the dashed box. Fig. 4 is a schematic diagram of power spectrum comparison before and after synthesis of the deskew signal, and it is obvious that the main lobe of the power spectrum of the signal after synthesis is much narrower than that before synthesis, which indicates that the resolution after synthesis is greatly improved. The distance, speed, image and the like of the detection target can be extracted from the combined deskew processing result by the conventional radar algorithmAnd (4) information.
Claims (8)
1. The radar detection method based on bandwidth synthesis after microwave photon-assisted deskew is characterized by comprising the following steps:
2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slope and sequentially increased or decreased center frequency are used for respectively carrying out electro-optical modulation in m frequency multiplication mode on two orthogonal polarization states of n paths of optical signals with different wavelengths in a one-to-one correspondence mode, the obtained n paths of polarization multiplexing modulation optical signals are combined into a path of combined optical signal and then sent to a transmitting end, and the bandwidth B of the ith intermediate frequency linear frequency modulation electric signal isiFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
at the transmitting end, wavelength demultiplexing and polarization demultiplexing are carried out on the combined optical signal, the 2n paths of separated modulated optical signals are divided into two paths, one path of modulated optical signals is subjected to photoelectric conversion to m frequency-doubled linear frequency modulation signals and then is radiated by a transmitting array element, and the other path of modulated optical signals is used as optical domain deskew received optical reference signals;
at a receiving end, the 2n optical reference signals are utilized to respectively perform optical domain deskew processing on echo signals collected by the 2n receiving array elements, and then 2n low-frequency deskew signals carrying target information are obtained through photoelectric conversion; performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f and delta f respectively according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal, B2nIs the bandwidth of the 2 nth intermediate frequency chirp signal.
2. The radar detection method of claim 1, wherein the n polarization-multiplexed modulated optical signals are obtained by n polarization-division-multiplexed modulators, each polarization-division-multiplexed modulator modulating two intermediate-frequency chirp signals onto two orthogonal polarization states of one optical signal, respectively.
3. The radar detection method of claim 2 wherein the partial division multiplexed modulator is a partial division multiplexed dual parallel mach-zehnder modulator.
4. The radar detection method of claim 1 wherein the optical domain deskew is performed by a mach-zehnder modulator operating at a quadrature bias point.
5. Radar detection device based on bandwidth synthesis after supplementary declivity of microwave photon, its characterized in that includes:
an optical domain signal frequency doubling and multiplexing module, which is used for performing electro-optical modulation of m frequency doubling modes on two orthogonal polarization states of n paths of optical signals with different wavelengths by using 2n intermediate frequency linear frequency modulation electric signals with equal frequency modulation slopes and sequentially increased or decreased center frequencies, combining the obtained n paths of polarization multiplexing modulation optical signals into a path of combined optical signal and then transmitting the combined optical signal to a transmitting end, wherein the bandwidth B of the ith intermediate frequency linear frequency modulation electric signal isiFrequency interval delta f between the central frequency of the (i + 1) th intermediate frequency linear frequency modulation electric signal and the central frequency of the (i) th intermediate frequency linear frequency modulation electric signaliM and n are positive integers, i is 1,2, …,2 n-1;
the optical domain demultiplexing module is positioned at the transmitting end and used for carrying out wavelength demultiplexing and polarization demultiplexing on the combined optical signal, dividing the 2n paths of separated modulated optical signals into two paths, carrying out photoelectric conversion on one path of modulated optical signals into m frequency-doubled linear frequency signals, radiating the m frequency-doubled linear frequency signals by a transmitting array element, and taking the other path of modulated optical signals as optical domain deskew received optical reference signals;
the optical domain deskew receiving module is positioned at a receiving end and used for respectively carrying out optical domain deskew processing on echo signals collected by the 2n receiving array elements by utilizing the 2n optical reference signals and then obtaining 2n low-frequency deskew signals carrying target information through photoelectric conversion;
a digital bandwidth synthesis module for performing analog-to-digital conversion on the 2n low-frequency deskew signals, performing phase and amplitude compensation in a digital domain, and delaying the 2n low-frequency deskew signals by 0, delta f according to the sequence of numbers from low to high1/k，…，(Δf1+Δf2+…+Δf2n-1) K, removing the overlapping part to synthesize an equivalent bandwidth of m [ Delta f ]1+Δf2+…+Δf2n-1+(B1+B2n)/2]Wherein k is the slope of the intermediate frequency chirp signal, B2nIs the bandwidth of the 2 nth intermediate frequency chirp signal.
6. The radar detection device of claim 5, wherein the optical domain signal frequency doubling and multiplexing module includes n polarization division multiplexing modulators, each polarization division multiplexing modulator modulating two intermediate frequency chirp signals onto two orthogonal polarization states of one optical signal, respectively.
7. The radar detection device of claim 6 wherein the partial division multiplexed modulator is a partial division multiplexed dual parallel mach-zehnder modulator.
8. The radar detection device of claim 5 wherein the optical domain deskew receiving module comprises 2n mach-zehnder modulators operating at quadrature bias points.
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| CN201910641364.0A CN110350980B (en) | 2019-07-16 | 2019-07-16 | Radar detection method and device based on bandwidth synthesis after microwave photon-assisted deskew |
| PCT/CN2020/087451 WO2021008189A1 (en) | 2019-07-16 | 2020-04-28 | Radar detection method and device based on bandwidth synthesis after microwave photon-assisted dechirping |
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| CN110350980B (en) * | 2019-07-16 | 2020-06-26 | 南京航空航天大学 | Radar detection method and device based on bandwidth synthesis after microwave photon-assisted deskew |
| CN113030929B (en) * | 2021-02-09 | 2023-06-06 | 清华大学 | Broadband radar signal receiving device and receiving method |
| CN113406662B (en) * | 2021-06-17 | 2022-03-11 | 南京航空航天大学 | Stepping frequency modulation system microwave photon broadband MIMO radar detection method and device |
| CN113721202B (en) * | 2021-08-16 | 2023-12-05 | 南京航空航天大学 | Microwave photon radar detection method and device based on broadband spectrum sensing |
| CN113612541B (en) * | 2021-09-09 | 2022-09-30 | 北京电子工程总体研究所 | TDOA-based target analog signal photon link transmission delay measuring device |
| CN114122728B (en) * | 2021-11-24 | 2024-04-26 | 中国人民解放军国防科技大学 | Uniform circular phased array direction finding method based on microwave photon phase shifter |
| CN114189281B (en) * | 2021-12-02 | 2023-03-24 | 南京航空航天大学 | Optical time delay measuring method and device based on frequency domain and phase combination |
| CN114614903B (en) * | 2022-03-29 | 2023-12-15 | 中国科学院半导体研究所 | Photon signal generator and generation method |
| CN114759948A (en) * | 2022-04-27 | 2022-07-15 | 苏州大学 | Microwave photon radar detection and frequency measurement method and integrated device thereof |
| CN115173949A (en) * | 2022-06-09 | 2022-10-11 | 青岛农业大学 | Duty ratio adjustable rectification cosine microwave signal generator, method and equipment |
| CN115225160B (en) * | 2022-06-19 | 2023-12-08 | 中国人民解放军空军工程大学 | Device and method for generating and receiving frequency-doubling phase coding linear frequency modulation signal |
| CN115412172B (en) * | 2022-07-08 | 2024-06-21 | 北京工业大学 | Microwave photon radar receiving and transmitting terminal function integration method based on polarization multiplexing |
| CN115396023A (en) * | 2022-07-27 | 2022-11-25 | 中国人民解放军空军工程大学 | Microwave photon technology-based frequency spectrum real-time monitoring device and monitoring method |
| CN115276803B (en) * | 2022-08-01 | 2023-10-13 | 南京航空航天大学 | Full-duplex optical-load wireless communication method and system |
| CN116182916B (en) * | 2023-04-27 | 2023-07-07 | 四川省医学科学院·四川省人民医院 | Photon sensing system for broadband phase modulation processing |
| CN117406238B (en) * | 2023-10-09 | 2024-05-28 | 北京交通大学 | Microwave photon dual-mode imaging system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472449A (en) * | 2013-09-16 | 2013-12-25 | 电子科技大学 | BP wideband synthesis method based on MIMO image domain |
| US9843398B1 (en) * | 2016-05-20 | 2017-12-12 | Rockwell Collins, Inc. | Photonic direct sampling digital receiver |
| CN108287349A (en) * | 2018-01-10 | 2018-07-17 | 南京航空航天大学 | Microwave photon MIMO radar detection method and microwave photon MIMO radar system |
| CN108761437A (en) * | 2018-04-08 | 2018-11-06 | 南京航空航天大学 | microwave photon polarization radar detection method and microwave photon polarization radar |
| CN108761398A (en) * | 2018-05-31 | 2018-11-06 | 南京航空航天大学 | Microwave photon two waveband radar detection method and microwave photon two waveband radar |
| CN108988955A (en) * | 2018-07-11 | 2018-12-11 | 南京航空航天大学 | Microwave photon radar detection method, device based on multichannel light reference signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818680B (en) * | 2019-03-04 | 2020-03-10 | 南京航空航天大学 | Microwave photon broadband radio frequency transceiving method and device |
| CN110350980B (en) * | 2019-07-16 | 2020-06-26 | 南京航空航天大学 | Radar detection method and device based on bandwidth synthesis after microwave photon-assisted deskew |
-
2019
- 2019-07-16 CN CN201910641364.0A patent/CN110350980B/en active Active
-
2020
- 2020-04-28 WO PCT/CN2020/087451 patent/WO2021008189A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472449A (en) * | 2013-09-16 | 2013-12-25 | 电子科技大学 | BP wideband synthesis method based on MIMO image domain |
| US9843398B1 (en) * | 2016-05-20 | 2017-12-12 | Rockwell Collins, Inc. | Photonic direct sampling digital receiver |
| CN108287349A (en) * | 2018-01-10 | 2018-07-17 | 南京航空航天大学 | Microwave photon MIMO radar detection method and microwave photon MIMO radar system |
| CN108761437A (en) * | 2018-04-08 | 2018-11-06 | 南京航空航天大学 | microwave photon polarization radar detection method and microwave photon polarization radar |
| CN108761398A (en) * | 2018-05-31 | 2018-11-06 | 南京航空航天大学 | Microwave photon two waveband radar detection method and microwave photon two waveband radar |
| CN108988955A (en) * | 2018-07-11 | 2018-12-11 | 南京航空航天大学 | Microwave photon radar detection method, device based on multichannel light reference signal |
Non-Patent Citations (1)
| Title |
|---|
| 一种新的高重频宽带相干激光雷达系统研究;李光祚 等;《电子与信息学报》;20171228;第525-531页 * |
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