Photoelectric fusion rapid frequency conversion receiving device

Abstract

The invention discloses a photoelectric fusion rapid frequency conversion receiving device, which comprises a laser, a first optical power divider, a first radio frequency power divider, a second radio frequency power divider and a frequency mixer, and is characterized in that the first radio frequency power divider receives a radio frequency signal, one path is input to the frequency mixer, and the other paths are input to a low noise amplifier array; each channel of the low noise amplifier array is correspondingly connected with one electro-optical modulator, the laser is connected with the first optical power divider, the first optical power divider is connected with each electro-optical modulator, each electro-optical modulator is correspondingly connected with one optical delay difference module, each optical delay difference module is correspondingly connected with the detector array, and the detector array is connected with the laser. The detector array is connected with the direct-current amplification array, the direct-current amplification array is connected with the radio frequency switch, the radio frequency switch receives local oscillator signals, the output end of the radio frequency switch is connected with the second radio frequency power divider, and the second radio frequency power divider is connected with the frequency mixer; the system has the advantages that the system is quick in response and low in power consumption, and the number and processing pressure of rear-end digital modules are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of microwave technology, and particularly to an optoelectronic integrated fast frequency conversion receiving device. Background Art

[0002] With the development of electronic technology, electronic information equipment has gradually developed towards high frequency bands and large bandwidths, which poses a huge challenge to the processing capabilities of traditional electronic receivers.

[0003] The superheterodyne receiver is the most widely used and technically mature electronic receiver. It generates an intermediate frequency signal by mixing the received high-frequency microwave signal with the local oscillator signal and processes the intermediate frequency signal. However, in the superheterodyne receiver, during the process of changing the frequency of the local oscillator signal and scanning the received signal, due to the limited frequency scanning rate of the local oscillator signal, pulse signals may be missed, reducing the intercept probability of the receiver for pulse signals. And the solution of integrating multiple narrowband receiver fronts into one unit to form a channelized receiver to achieve broadband reception often requires a large number of fixed local oscillators, band-pass filters and other devices to realize digital acquisition and processing of multiple channels. Generally, it has disadvantages such as poor flexibility, complex circuit, long response time, large volume, and high cost. Especially in the field of electronic countermeasures, it is difficult to meet the development needs of fast broadband reception.

[0004] Microwave photon technology uses optical methods to generate, transmit, receive, and process high-frequency broadband microwave signals, which can break through the limitations of electronics and has advantages such as large bandwidth, low loss, small volume, light weight, and anti-electromagnetic interference. For example, a broadband tunable microwave photon frequency conversion system with self-generated local oscillator signals disclosed in Chinese Patent Publication No. CN116527151A uses microwave photon technology to achieve mixing output. However, the mixing reception of this patent application uses a single channel, resulting in slow system response, high power consumption, and greatly increasing the number and processing pressure of the backend digital modules. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing frequency conversion receiving method has slow system response, high power consumption, and large number and processing pressure of the backend digital modules.

[0006] The present invention solves the above technical problems through the following technical means: An optoelectronic integrated fast frequency conversion receiving device includes a laser, a first optical power splitter, a first radio frequency power splitter, a second radio frequency power splitter, and a mixer. The first radio frequency power splitter receives a radio frequency signal and outputs N + 1 paths of signals. One path is input to the mixer, and the other N paths are input to each channel of a low-noise amplifier array. Each channel of the low-noise amplifier array is respectively connected to an electro-optic modulator. The laser is connected to the first optical power splitter, the first optical power splitter is connected to each electro-optic modulator, each electro-optic modulator is respectively connected to an optical delay difference module, each optical delay difference module is respectively connected to each channel of a detector array, each channel of the detector array is correspondingly connected to each channel of a DC amplification array, each channel of the DC amplification array is respectively connected to a radio frequency switch, each radio frequency switch receives a local oscillator signal and its output end is connected to the second radio frequency power splitter, the second radio frequency power splitter is connected to the mixer, and the mixer outputs a signal to a subsequent digital signal processing module for subsequent digital signal processing.

[0007] The present invention completes the screening of the corresponding local oscillator signal for an unknown signal in the optical domain, realizes heterodyne mixing reception of the radio frequency signal received within the ultra-wideband working range and then performs digital processing. Compared with channelized reception, the number and processing pressure of the subsequent digital modules are greatly reduced. In addition, the mixer reception part of the system is multi-channel parallel analog processing, the system has a fast response and low power consumption, and can effectively improve the ultra-wideband, fast, and low-power radio frequency reception and processing capabilities of an electronic information system in a complex electromagnetic environment.

[0008] Further, the radio frequency signal is divided into N + 1 paths of signals with equal power by the first radio frequency power splitter. One path of the signal is used for subsequent mixing reception and is input to the mixer, and the remaining N paths of signals are respectively saturated amplified through the low-noise amplifier array and output, and it is ensured that the power of these N paths of output signals is the same and does not change with the change of the input radio frequency signal.

[0009] Further, the optical carrier signal output by the laser passes through the first optical power splitter, is divided into N paths of optical signals with equal power and is respectively input into the corresponding electro-optic modulators as optical carrier signals, and after being modulated by the radio frequency signals of the corresponding channels, it is output to the corresponding optical delay difference modules.

[0010] Further, the optical delay difference module includes a second optical power splitter, two photodetectors, and a third radio frequency power splitter. The output end of the second optical power splitter is respectively connected to the two photodetectors through two different optical fibers, and both photodetectors are connected to the third radio frequency power splitter.

[0011] Further, the principle of the optical delay difference module is as follows: The optical signal input by the electro-optic modulator is divided into upper and lower two-way optical signals with equal power by the second optical power splitter. After the upper and lower two-way optical signals pass through two different optical fiber delays respectively, they are respectively input into two photodetectors for photoelectric conversion and direct current isolation to output two radio frequency signals. These two radio frequency signals are then superimposed and synthesized into one radio frequency signal output through the third radio frequency power splitter.

[0012] Further, each optical delay difference module respectively performs different delay differences τ on the optical signals input by each electro-optic modulator, and each optical delay difference module realizes different frequency-amplitude response curves.

[0013] Furthermore, the optical signals passing through each optical delay difference module respectively pass through the detector array to output the envelopes of the radio frequency signals of each channel, and then pass through the direct current amplification array to perform equal signal amplification on the direct current envelopes output by each channel.

[0014] Furthermore, the direct current envelope signals amplified by the direct current amplification array are respectively input into the corresponding radio frequency switches. Since the frequency-amplitude response curves of each channel optical delay difference module are different, the direct current envelope signals output by the direct current amplification array are also different. Therefore, the on and off of the radio frequency switch signals are driven.

[0015] Furthermore, the way to drive the on and off of different radio frequency switch signals is as follows:

[0016] By adjusting the amplification factor of the direct current amplification array, only the radio frequency switch of this channel is closed when the radio frequency signals of the corresponding frequency bandwidth of each channel are input.

[0017] Further, after the radio frequency switch is closed, the local oscillator signal of the corresponding channel passes through the radio frequency switch and the second radio frequency power splitter and then is input into the mixer, and is down-converted to the intermediate frequency and output with the 1-way signal output through the radio frequency power splitter. The output intermediate frequency signal is then input into the digital signal processing module for subsequent digital signal processing.

[0018] The advantages of the present invention are as follows:

[0019] (1) In the present invention, the frequency of the unknown signal is modulated to the optical domain through microwave photon technology, and the mapping from the frequency parameter of the measured signal to the amplitude parameter is realized through differential interference. Furthermore, the screening of the corresponding local oscillator signal is completed, and the heterodyne mixing reception of the radio frequency signals received within the ultra-wideband working range is realized and then digital processing is performed. Compared with channelized reception, the number and processing pressure of the backend digital modules are greatly reduced. In addition, the mixing reception part of the system is multi-channel parallel analog processing, and the system has fast response and low power consumption, and can effectively improve the ultra-wideband, fast, and low-power radio frequency reception and processing capabilities of the electronic information system in a complex electromagnetic environment.

[0020] (2) The present invention combines the advantages of microwave and photon technologies, adopts an optoelectronic integrated broadband frequency conversion receiving technology, realizes heterodyne mixing reception of radio frequency signals received within the ultra-wideband operating range and then performs digital processing. Since the frequency of the optical carrier signal is much greater than that of the radio frequency signal, the signal after optical modulation can achieve high-consistency signal processing within a wide bandwidth, effectively improving the ultra-wideband, fast, and low-power radio frequency receiving and processing capabilities of electronic information systems in complex electromagnetic environments. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of an optoelectronic integrated fast frequency conversion receiving device disclosed in an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the optical delay difference module in an optoelectronic integrated fast frequency conversion receiving device disclosed in an embodiment of the present invention

[0023] Figure 3 It is the output simulation result of different delay differences τ of the optical delay difference module in an optoelectronic integrated fast frequency conversion receiving device disclosed in an embodiment of the present invention. Detailed Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1 shown, an embodiment of the present invention provides an optoelectronic integrated fast frequency conversion receiving device, including a first radio frequency power splitter, a low-noise amplifier array, a laser, a first optical power splitter, N electro-optic modulators, N optical delay difference modules, N photodetectors, a detector array, a DC amplification array, N local oscillators, N radio frequency switches, a second radio frequency power splitter, a mixer, digital signal processing, etc.

[0026] Continuing to refer to Figure 1 , the received radio frequency signal is divided into multiple signals with equal power by the first radio frequency power splitter. One of the signals is used for subsequent heterodyne reception, and the remaining N signals are saturated amplified and output respectively through the low-noise amplifier array to ensure that the power of these N output signals is the same and does not change with the change of the received radio frequency signal input.

[0027] The radio frequency signals amplified and output in multiple paths are respectively connected to the radio frequency input ports of multiple electro-optic modulators. The optical carrier signal output by the laser passes through the first optical power splitter, is divided into N optical signals with equal power, and is respectively input into the corresponding electro-optic modulators as optical carrier signals, and then is output after being modulated by the radio frequency signals in the corresponding channels.

[0028] The N modulated optical signals described above are respectively output to the corresponding optical delay difference modules. The schematic diagram of the optical delay difference module is as Figure 2 shown. The input optical signal is divided into upper and lower optical signals with equal power by the second optical power splitter. After the upper and lower optical signals pass through two different optical fiber delays respectively, they are respectively input into two photodetectors to be converted and direct-current blocked to output two radio frequency signals. These two radio frequency signals are then superimposed and synthesized into one radio frequency signal output through the third radio frequency power splitter. The optical delay difference modules 1 to N respectively perform different delay differences τ on the corresponding optical signals to achieve different frequency-amplitude response curves. The simulation results are as Figure 3 shown.

[0029] The optical signals of each path passing through the optical delay difference module respectively pass through the detector array to output the envelopes of the radio frequency signals of each channel, and then pass through the direct-current amplification array to perform equal signal amplification on the direct-current envelopes output by each path.

[0030] The amplified direct-current envelope signals are respectively input into the corresponding radio frequency switches. Since the frequency-amplitude response curves of the optical delay difference modules of each channel described above are different, the output direct-current envelope signals corresponding to the signals of different input frequencies are also different. Therefore, the on / off of different radio frequency switch signals is also driven. By ensuring the amplification factor of the direct-current amplification array, only the radio frequency switch of this channel can be closed when the radio frequency signals with the corresponding frequency bandwidth are input in each channel. As Figure 3 shown, the gain within each channel band is all lower than the gain outside the band. Therefore, when the radio frequency signals within the corresponding band pass through the system and output signals at the optical delay difference module and the detector array, the signals are amplified by the direct-current amplification array. The direct-current amplification factor of the corresponding channel is designed so that the direct-current signals output after amplification when the radio frequency signals within the band are input cannot change the state of the switch, and the switch is in the closed and conducting state. On the contrary, when the radio frequency signals outside the channel band are input and pass through the system, the signals amplified by the corresponding optical delay difference module can exactly switch the radio frequency switch to the off state.

[0031] When the radio frequency switch of the corresponding channel is closed, the local oscillator signal of the corresponding channel passes through the radio frequency switch and the second radio frequency power splitter and then is input into the mixer, and is down-converted to the intermediate frequency and output with the 1-way signal output through the radio frequency power splitter described above. The output intermediate frequency signal is then input into the digital signal processing module for subsequent digital signal processing.

[0032] Through the above technical solutions, the present invention completes the screening of the corresponding local oscillator signal for the frequency of the unknown signal in the optical domain, realizes the heterodyne mixing reception of the radio frequency signal received within the ultra-wideband working range and then performs digital processing. Compared with channelized reception, the number and processing pressure of the backend digital modules are greatly reduced. In addition, the mixing reception part of the system is an analog processing with multi-channel parallelism, and the system has a fast response and low power consumption, which can effectively improve the ultra-wideband, fast, and low-power radio frequency reception and processing capabilities of the electronic information system in a complex electromagnetic environment.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photoelectric fusion fast frequency conversion receiving device, characterized in that: It includes a laser, a first optical power divider, a first radio frequency power divider, a second radio frequency power divider and a mixer. The first radio frequency power divider receives radio frequency signals and outputs N+1 signals, one of which is input to the mixer, and the other N are input to each channel of a low noise amplifier array. Each channel of the low noise amplifier array is respectively connected to an electro-optical modulator. The laser is connected to the first optical power divider, the first optical power divider is connected to each electro-optical modulator, each electro-optical modulator is respectively connected to an optical delay differential module, each optical delay differential module is respectively connected to each channel of a detector array, each channel of the detector array is correspondingly connected to each channel of a direct current amplifier array, each channel of the direct current amplifier array is respectively connected to a radio frequency switch, each radio frequency switch receives a local oscillator signal and the output end is connected to the second radio frequency power divider, the second radio frequency power divider is connected to the mixer, and the mixer outputs a signal to a back-end digital signal processing module for subsequent digital signal processing.

2. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: The RF signal is divided into N+1 signals of equal power by a first RF power divider, one of which is used for subsequent mixing reception and input into a mixer, and the remaining N signals are saturatedly amplified and outputted by a low-noise amplifier array, and the power of the N output signals is ensured to be the same and does not change with changes in the input RF signal.

3. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: The laser output optical carrier signal is divided into N optical signals of equal power through the first optical power divider and respectively input into corresponding electro-optical modulators as optical carrier signals, and then output into corresponding optical delay differential modules after being modulated by the RF signal of the corresponding channel.

4. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: The optical delay differential module includes a second optical power divider, two photoelectric detectors and a third radio frequency power divider. The output end of the second optical power divider is connected to the two photoelectric detectors through two different optical fibers, and the two photoelectric detectors are connected to the third radio frequency power divider.

5. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: The principle of the optical delay differential module is as follows: the optical signal input by the electro-optical modulator is divided into two equal-power upper and lower optical signals through the second optical power divider. After the upper and lower optical signals are delayed by two different optical fibers, they are respectively input into two photoelectric detectors for photoelectric conversion and direct-current isolation to output two RF signals. The two RF signals are then superimposed and synthesized into one RF signal through the third RF power divider for output.

6. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: Each optical delay differential module performs a different delay difference τ on the optical signal input by each electro-optical modulator, and each optical delay differential module realizes a different frequency-amplitude response curve.

7. The optoelectronic fusion fast frequency conversion receiving device according to claim 6, characterized in that: Each optical signal passing through the optical delay differential module passes through the detector array to output the envelope of the RF signal of each channel, and then passes through the DC amplifier array to perform equal signal amplification on each DC envelope outputted from each channel.

8. The optoelectronic fusion fast frequency conversion receiving device according to claim 7, characterized in that: The DC envelope signals amplified by the DC amplifier array are input into the corresponding RF switches respectively. Since the frequency-amplitude corresponding curves of the optical delay differential modules of each channel are different, the DC envelope signals output by the DC amplifier array are also different, thus driving different RF switch signals on and off.

9. The optoelectronic fusion fast frequency conversion receiving device according to claim 8, characterized in that: The way to drive different RF switch signals on and off is: By adjusting the gain of the DC amplifier array, only the RF switch of each channel is closed when the RF signal of the corresponding frequency bandwidth of each channel is input.

10. The optoelectronic fusion fast frequency conversion receiving device according to claim 1, characterized in that: After the RF switch is closed, the local oscillator signal of the corresponding channel is input into the mixer after passing through the RF switch and the second RF power divider, and is down-converted to an intermediate frequency output with the 1-way signal output by the RF power divider. The output intermediate frequency signal is then input into the digital signal processing module for subsequent digital signal processing.

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