A multi-band multi-channel microwave signal generating device

Abstract

The present invention relates to a multi-band and multi-channel microwave signal generating device, belonging to the technical field of microwave frequency synthesis, and solves the problem that the single-band and single-channel microwave frequency synthesizer in the prior art cannot meet the requirements of a multi-channel coherent radar system. A multi-band and multi-channel microwave signal generating device includes a frequency hopping source circuit, a fixed-frequency source circuit, a first microwave switch matrix circuit, a second microwave switch matrix circuit, and m output channels; the structure of each output channel is the same, and each includes a first-stage mixing circuit and a microwave frequency conversion circuit; the first-stage mixing circuit is based on the input intermediate-frequency signal and the X-band mixing local oscillator signal, outputs an X-band radio frequency signal / X-band local oscillator signal, and distributes the power to the microwave frequency conversion circuit; the microwave frequency conversion circuit is based on the input X-band radio frequency signal / X-band local oscillator signal and the C-band mixing local oscillator signal, and outputs a C-band radio frequency signal / C-band local oscillator signal. The multi-channel and multi-band simultaneous operation of the coherent radar system is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave frequency synthesis, and in particular, to a multi-band and multi-channel microwave signal generating device. Background Art

[0002] With the development of technology, traditional active coherent radars operate in a single-band and single-channel manner, and cannot achieve multi-channel and dual-band simultaneous operation.

[0003] Today, with the rapid development of electronic warfare and information warfare, military coherent radars need to have the capabilities of survival, anti-interference, and combat in complex electromagnetic environments. Single-band and single-channel microwave frequency synthesizers can no longer meet the requirements of multi-channel coherent radar systems.

[0004] Therefore, there is an urgent need for a multi-band and multi-channel microwave signal generating device. Summary of the Invention

[0005] In view of the above analysis, embodiments of the present invention aim to provide a multi-band and multi-channel microwave signal generating device to solve the problem that existing single-band and single-channel microwave frequency synthesizers can no longer meet the requirements of multi-band and multi-channel coherent radar systems.

[0006] On the one hand, embodiments of the present invention provide a multi-band and multi-channel microwave signal generating device, including a frequency hopping source circuit, a fixed-frequency source circuit, a first microwave switch matrix circuit, a second microwave switch matrix circuit, and m output channels;

[0007] Each output channel has the same structure and includes a first-stage mixing circuit and a microwave frequency conversion circuit;

[0008] The frequency hopping source circuit includes n frequency hopping sources;

[0009] The fixed-frequency source circuit includes two fixed-frequency sources 1 and 2 with different frequencies;

[0010] The first microwave switch matrix circuit is connected between the frequency hopping source circuit and the first-stage mixing circuits of each output channel, and is used to select a frequency hopping source for each first-stage mixing circuit as the X-band mixing local oscillator signal of each first-stage mixing circuit;

[0011] The second microwave switch matrix circuit is connected between the fixed-frequency source circuit and the microwave frequency conversion circuits of each output channel, and is used to select a fixed-frequency source for each microwave frequency conversion circuit as the C-band mixing local oscillator signal of each microwave frequency conversion circuit;

[0012] The first-stage mixing circuit is based on the input intermediate-frequency signal and the X-band mixing local oscillator signal, outputs an X-band radio frequency signal / X-band local oscillator signal, and distributes the X-band radio frequency signal / X-band local oscillator signal to the microwave frequency conversion circuit;

[0013] The microwave frequency conversion circuit outputs a C-band radio frequency signal / C-band local oscillator signal based on the input X-band radio frequency signal / X-band local oscillator signal and C-band mixing local oscillator signal.

[0014] Further, the first-stage mixing circuit includes a first microwave switch, a first amplifier, a first mixer, a second microwave switch, a first switch filter bank, a second amplifier, a third amplifier, and a power divider. The X-band mixing local oscillator signal is output to the first amplifier or the second microwave switch after being selected by the first microwave switch. The X-band mixing local oscillator signal is input to the first mixer after passing through the first amplifier. In the first mixer, it is mixed with the input intermediate frequency signal to obtain radio frequency signal 1, and radio frequency signal 1 is output to the second microwave switch. Through the second microwave switch, radio frequency signal 1 or the X-band mixing local oscillator signal is sequentially output to the first switch filter bank for filtering, the second amplifier for amplification, and then power-divided by the power divider. One path of the signal is output to the third amplifier for amplification and then outputs the X-band radio frequency signal or the X-band local oscillator signal, and the other path of the signal is input to the microwave frequency conversion circuit.

[0015] Further, the microwave frequency conversion circuit includes a fourth amplifier, a second mixer, a second switch filter bank, and a fifth amplifier. The C-band mixing local oscillator signal is output to the second mixer after passing through the fourth amplifier. In the second mixer, it is mixed with the other path of the signal after power division by the power divider to obtain radio frequency signal 2 or local oscillator signal 1, and radio frequency signal 2 or local oscillator signal 1 is sequentially output to the second switch filter bank for filtering and the fifth amplifier for amplification, and then outputs the C-band radio frequency signal or the C-band local oscillator signal.

[0016] Further, when the microwave frequency conversion circuit outputs a C-band radio frequency signal, the second microwave switch matrix circuit selects the point frequency source 1 as the C-band mixing local oscillator signal. When the microwave frequency conversion circuit outputs a C-band local oscillator signal, the second microwave switch matrix circuit selects the point frequency source 2 as the C-band mixing local oscillator signal.

[0017] Further, the multi-band multi-channel microwave signal generating device further includes a reference clock distribution circuit, and the reference clock distribution circuit provides a clock reference signal for the frequency hopping source circuit, the point frequency source 1, and the point frequency source 2.

[0018] Further, the first microwave switch matrix circuit includes n one-to-m power dividers and m single-pole n-throw switches, and each power divider is connected to m switches; each power divider is connected to a frequency hopping source, and each switch is respectively connected to the first-stage mixing circuit in an output channel;

[0019] The second microwave switch matrix circuit includes 2 one-to-m power dividers and m single-pole double-throw switches. Each power divider is connected to a point frequency source, each power divider is connected to m switches, and each switch is respectively connected to the microwave frequency conversion circuit in an output channel.

[0020] Further, when the frequencies of the X-band RF signals output by the respective output channels are the same, the frequencies of the C-band RF signals output by the respective output channels are also the same.

[0021] Further, when channels 1 to m operate at the same frequency, the first microwave switch matrix circuit selects the frequency hopping source i to provide the X-band mixing local oscillator signals for the m channels; after power division of the frequency hopping source i, it provides the X-band mixing local oscillator signals for channels 1 to m.

[0022] Further, when channels 1 to m operate at different frequencies, the first microwave switch matrix circuit selects the frequency hopping source i to be power-divided to provide the X-band mixing local oscillator signals for the channels with the same frequency.

[0023] Further, the operating bandwidths of the X-band RF signals and the local oscillator signals are 2.4 GHz, and the spurious indexes are better than 60 dB.

[0024] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0025] 1. By providing a plurality of output channels, the present invention realizes multi-channel output; by providing a first-stage mixing circuit and a microwave frequency conversion circuit in each output channel, the output of two different frequency bands, namely the X-band and the C-band, is realized; by providing a first microwave switch matrix and a frequency hopping source circuit, different frequency X-band mixing local oscillator signals are provided for each output channel, enabling each output channel to operate at different frequencies in the X-band and the C-band. By providing a second microwave switch matrix and the fixed-frequency sources 1 and 2, different C-band mixing local oscillator signals can be provided for each output channel, so that the output RF signals and the local oscillator signals in the X and C bands have different frequency differences. That is, the multi-band multi-channel microwave signal generating device of the present invention improves the survival ability, anti-interference ability, and combat ability of coherent radars in complex electromagnetic environments;

[0026] 2. The C-band frequency conversion fully reuses the X-band frequency conversion channels, and through one-time down-conversion of the X-band RF signals and the X-band local oscillator signals, the C-band RF signals and the C-band local oscillator signals are output. Moreover, the RF signals and the local oscillator signals of each microwave channel in the X and C bands are transmitted through the same channel in a time-division multiplexing manner, reducing the number of frequency hopping source circuits used, and bringing very good benefits in terms of reducing volume, reducing power consumption, optimizing microwave circuits, and saving hardware costs.

[0027] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following specification, and some advantages can be made obvious from the specification, or can be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained from the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components.

[0029] Figure 1 It is a schematic diagram of a multi-band multi-channel microwave signal generating device DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will specifically describe the preferred embodiments of the present invention with reference to the drawings. The drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0031] A specific embodiment of the present invention discloses a multi-band multi-channel microwave signal generating device, which includes a frequency hopping source circuit, a fixed-frequency source circuit, a first microwave switch matrix circuit, a second microwave switch matrix circuit, and m output channels;

[0032] Each output channel has the same structure and includes a first-stage mixing circuit and a microwave frequency conversion circuit;

[0033] The frequency hopping source circuit includes n frequency hopping sources;

[0034] The fixed-frequency source circuit includes two fixed-frequency sources 1 and 2 with different frequencies;

[0035] The first microwave switch matrix circuit is connected between the frequency hopping source circuit and the first-stage mixing circuits of the output channels, and is used to select a frequency hopping source for each first-stage mixing circuit as the X-band mixing local oscillator signal of each first-stage mixing circuit;

[0036] The second microwave switch matrix circuit is connected between the fixed-frequency source circuit and the microwave frequency conversion circuits of the output channels, and is used to select a fixed-frequency source for each microwave frequency conversion circuit as the C-band mixing local oscillator signal of each microwave frequency conversion circuit;

[0037] The first-stage mixing circuit is based on the input intermediate frequency signal and the X-band mixing local oscillator signal, outputs an X-band radio frequency signal / X-band local oscillator signal, and distributes the X-band radio frequency signal / X-band local oscillator signal to the microwave frequency conversion circuit;

[0038] The microwave frequency conversion circuit outputs a C-band radio frequency signal / C-band local oscillator signal based on the input X-band radio frequency signal / X-band local oscillator signal and C-band mixing local oscillator signal.

[0039] Further, the first-stage mixing circuit includes a first microwave switch, a first amplifier, a first mixer, a second microwave switch, a first switch filter bank, a second amplifier, a third amplifier, and a power divider. The X-band mixing local oscillator signal is output to the first amplifier or the second microwave switch after being selected by the first microwave switch. The X-band mixing local oscillator signal is input to the first mixer after passing through the first amplifier. In the first mixer, it is mixed with the input intermediate frequency signal to obtain radio frequency signal 1, and radio frequency signal 1 is output to the second microwave switch. The radio frequency signal 1 or the X-band mixing local oscillator signal is sequentially output to the first switch filter bank for filtering, amplified by the second amplifier, and then divided by the power divider. One path of the signal is output to the third amplifier for amplification and then outputs the X-band radio frequency signal or the X-band local oscillator signal, and the other path of the signal is input to the microwave frequency conversion circuit.

[0040] Further, the microwave frequency conversion circuit includes a fourth amplifier, a second mixer, a second switch filter bank, and a fifth amplifier. The C-band mixing local oscillator signal is output to the second mixer after passing through the fourth amplifier. In the second mixer, it is mixed with the other path of the signal divided by the power divider to obtain radio frequency signal 2 or local oscillator signal 1, and radio frequency signal 2 or local oscillator signal 1 is sequentially output to the second switch filter bank for filtering and amplified by the fifth amplifier, and then outputs the C-band radio frequency signal or the C-band local oscillator signal.

[0041] It can be understood that when the second microwave switch outputs radio frequency signal 1, the power divider divides this radio frequency signal into two paths. One path is input to the third amplifier for amplification, and at this time, the third amplifier outputs the X-band radio frequency signal; the other path of the radio frequency signal enters the microwave frequency conversion circuit and is mixed with the C-band mixing local oscillator signal to output the C-band radio frequency signal.

[0042] When the second microwave switch outputs the X-band mixing local oscillator signal, the power divider divides this signal into two paths. One path is input to the third amplifier for amplification, and at this time, the third amplifier outputs the X-band local oscillator signal, that is, at this time, the X-band mixing local oscillator signal input to the first-stage mixing circuit is directly used as the X-band local oscillator signal after filtering and amplification. The other path of the signal is input to the microwave frequency conversion circuit and is mixed with the C-band mixing local oscillator signal to obtain the C-band local oscillator signal.

[0043] Each output channel realizes the spectral shift of the intermediate-frequency signal to the X-band through the first-stage mixing circuit, and realizes the spectral shift of the X-band to the C-band through the microwave frequency conversion circuit, fully reusing the X-band frequency conversion channel. The X-band radio frequency signal and the local oscillator signal are down-converted once to output the C-band radio frequency signal and the C-band local oscillator signal. Moreover, the radio frequency signal and the local oscillator signal of each microwave channel in the X and C bands are transmitted through the same channel in a time-division multiplexing manner.

[0044] During specific implementation, the generation processes of the radio frequency signals and local oscillator signals in the X-band and C-band are as follows:

[0045] Generation process of the X-band radio frequency signal: After the X-band mixing local oscillator signal passes through the first microwave switch and the first amplifier, it is mixed with the intermediate-frequency signal in the first mixer, and then passes through circuits such as the second microwave switch, the first switch filter bank, the first amplifier, the power divider, and the third amplifier to output the X-band radio frequency signal.

[0046] Generation process of the X-band local oscillator signal: After the X-band mixing local oscillator signal passes through circuits such as the first microwave switch, the second microwave switch, the first switch filter bank, the second amplifier, the power divider, and the third amplifier, it works in a time-division multiplexing manner with the X-band radio frequency signal through the same channel to output the X-band local oscillator signal.

[0047] Generation process of the C-band radio frequency signal: After the X-band radio frequency signal is divided by the power divider and mixed with the C-band mixing local oscillator signal in the second mixer, it passes through circuits such as the second switch filter bank and the fifth amplifier to output the C-band radio frequency signal, where the C-band mixing Local oscillator signal signal selects the point frequency source 1 through the second microwave switch matrix.

[0048] Generation process of the C-band local oscillator signal: After the X-band local oscillator signal is divided by the power divider and mixed with the C-band mixing local oscillator signal in the second mixer, it passes through circuits such as the second switch filter bank and the fifth amplifier to output the C-band local oscillator signal, where the C-band mixing local oscillator signal selects the point frequency source 2 through the second microwave switch matrix.

[0049] In order to realize the simultaneous operation of multi-band microwave signals, the radar receiver system must have different intermediate-frequency bands. The radar receives echo signals in different bands and down-converts them to different intermediate-frequency bands. The digital signal processing system samples and analyzes the echo signals with different intermediate frequencies simultaneously, so as to realize the simultaneous operation of multiple bands of the radar system.

[0050] Radar receiving X-band intermediate-frequency operating frequency:

[0051] X_IF = (X_LO - X_RF)

[0052] Where X_IF is the X-band intermediate-frequency operating frequency, X_LO is the X-band local oscillator signal, and X_RF is the X-band radio frequency signal.

[0053] The intermediate frequency operating frequency of the radar receiving C-band:

[0054] C_IF = C_LO - C_RF

[0055] Where C_IF is the intermediate frequency operating frequency of the C-band, C_LO is the local oscillator signal of the C-band, and C_RF is the radio frequency signal of the C-band.

[0056] Furthermore, when the microwave frequency conversion circuit outputs a C-band radio frequency signal, the second microwave switch matrix circuit selects the point frequency source 1 as the C-band mixing local oscillator signal, and when the microwave frequency conversion circuit outputs a C-band local oscillator signal, the second microwave switch matrix circuit selects the point frequency source 2 as the C-band mixing local oscillator signal.

[0057] Furthermore, the multi-band multi-channel microwave signal generating device further includes a reference clock distribution circuit, and the reference clock distribution circuit provides a clock reference signal for the frequency hopping source circuit, the point frequency source 1, and the point frequency source 2.

[0058] Furthermore, the first microwave switch matrix circuit includes n one-to-m power dividers and m single-pole n-throw switches, each power divider is connected to m switches; each power divider is connected to a frequency hopping source, and each switch is respectively connected to the first-stage mixing circuit in an output channel;

[0059] The second microwave switch matrix circuit includes 2 one-to-m power dividers and m single-pole double-throw switches, each power divider is connected to a point frequency source, each power divider is connected to m switches, and each switch is respectively connected to the microwave frequency conversion circuit in an output channel.

[0060] Specifically, the second microwave switch matrix circuit finally realizes that the output radio frequency signal and the local oscillator signal in the C-band have different frequency differences by selecting different point frequency source signals for output.

[0061] Furthermore, when the X-band radio frequency signals output by the respective output channels have the same frequency, the C-band radio frequency signals output by the respective output channels also have the same frequency.

[0062] Furthermore, when channels 1 to m operate at the same frequency, the first microwave switch matrix circuit selects the frequency hopping source i to provide an X-band mixing local oscillator signal for the m channels; after being divided by the power divider, the frequency hopping source i provides the same-frequency X-band mixing local oscillator signal for channels 1 to m.

[0063] Furthermore, when channels 1 to m operate at different frequencies, the first microwave switch matrix circuit selects the frequency hopping source i to be divided by the power divider to provide an X-band mixing local oscillator signal for the same-frequency channels.

[0064] In a specific embodiment, such as Figure 1, two output channels are provided. The frequency hopping source circuit includes frequency hopping source 1 and frequency hopping source 2. The first microwave switch matrix circuit selects frequency hopping source 1 or frequency hopping source 2 as the X-band mixing local oscillator signal for channel 1; selects frequency hopping source 1 or frequency hopping source 2 as the X-band mixing local oscillator signal for channel 2.

[0065] When channel 1 and channel 2 operate at different frequencies, frequency hopping source 1 provides the X-band mixing local oscillator signal for channel 1, and frequency hopping source 2 provides the X-band mixing local oscillator signal for channel 2; when channel 1 and channel 2 operate at the same frequency, frequency hopping source 1 or frequency hopping source 2 is power-divided to provide the X-band mixing local oscillator signal for channel 1 and channel 2.

[0066] Specifically in implementation, the process of generating four-channel signals is as follows:

[0067] Process of generating the X-band radio frequency signal (X_RF1) of channel 1: After the X-band mixing local oscillator signal (HLO1) passes through the first microwave switch, the first amplifier and is mixed with the intermediate frequency signal (IF1) in the first mixer, and then passes through the second microwave switch, the first switch filter bank, the second amplifier, the power divider, the third amplifier and other circuits, the X-band radio frequency signal (X_RF1) is output.

[0068] Process of generating the X-band local oscillator signal (X_LO1) of channel 1: After the X-band mixing local oscillator signal (HLO1) passes through the first microwave switch, the second microwave switch, the first switch filter bank, the second amplifier, the power divider, the third amplifier and other circuits, it works in a time-sharing manner in the same channel as the X-band radio frequency signal (X_RF1) to output the X-band local oscillator signal (X_LO1).

[0069] Process of generating the C-band radio frequency signal (C_RF1) of channel 1: After the X-band radio frequency signal (X_RF1) is power-divided, it is mixed with the C-band mixing local oscillator signal (CLO1) in the second mixer, and then passes through the second switch filter bank, the fifth amplifier and other circuits to output the C-band radio frequency signal (C_RF1), where the C-band mixing local oscillator signal (CLO1) selects the fixed-frequency source (LO3) through the second microwave switch matrix

[0070] Process of generating the C-band local oscillator signal (C_LO1) of channel 1: After the X-band local oscillator signal (X_LO1) is power-divided, it is mixed with the C-band mixing local oscillator signal (CLO1) in the second mixer, and then passes through the second switch filter bank, the fifth amplifier and other circuits to output the C-band local oscillator signal (C_LO1), where the C-band mixing local oscillator signal (CLO1) selects the fixed-frequency source 2 (LO4) through the second microwave switch matrix.

[0071] Generation process of the X-band RF signal (X_RF2) for Channel 2: After the X-band mixing local oscillator signal (HLO2) passes through the first microwave switch, the first amplifier and is mixed with the intermediate frequency signal (IF2) in the first mixer, it then passes through circuits such as the second microwave switch, the first switch filter bank, the second amplifier, the power divider, the third amplifier, etc., and outputs the X-band RF signal (X_RF2).

[0072] Generation process of the X-band local oscillator signal (X_LO2) for Channel 2: After the X-band mixing local oscillator signal (HLO2) passes through circuits such as the first microwave switch, the second microwave switch, the first switch filter bank, the second amplifier, the power divider, the third amplifier, etc., it works in a time-division multiplexing manner in the same channel as the X-band RF signal (X_RF2) and outputs the X-band local oscillator signal (X_LO2).

[0073] Generation process of the C-band RF signal (C_RF2) for Channel 2: After the X-band RF signal (X_RF2) is divided by the power divider and mixed with the C-band mixing local oscillator signal (CLO2) in the second mixer, it then passes through circuits such as the second switch filter bank, the fifth amplifier, etc., and outputs the C-band RF signal (C_RF2), where the C-band mixing local oscillator signal (CLO2) selects the point frequency source 1 (LO3) through the second microwave switch matrix.

[0074] Generation process of the C-band local oscillator signal (C_LO2) for Channel 2: After the X-band local oscillator signal (X_LO2) is divided by the power divider and mixed with the C-band mixing local oscillator signal (CLO2) in the second mixer, it then passes through circuits such as the second switch filter bank, the fifth amplifier, etc., and outputs the C-band local oscillator signal (C_LO2), where the C-band mixing local oscillator signal (CLO2) selects the point frequency source 2 (LO4) through the second microwave switch matrix.

[0075] Radar receiving X-band intermediate frequency operating frequency:

[0076] X_IF = (X_LO1 - X_RF1).

[0077] Radar receiving C-band intermediate frequency operating frequency:

[0078] C_IF = (C_LO1 - C_RF1) = (X_LO1 - LO4) - (X_RF1 - LO3) = (X_LO1 - X_RF1) + (LO3 - LO4) = X_IF + (LO3 - LO4).

[0079] Where X_IF is the X-band intermediate frequency operating frequency and C_IF is the C-band intermediate frequency operating frequency.

[0080] Furthermore, the operating bandwidth of the X-band RF signal and the local oscillator signal is 2.4 GHz, and the spurious index is better than 60 dB.

[0081] Specifically, the present invention realizes multi-channel microwave signals with high signal quality in the X-band and C-band. For the X-band radio frequency signal and the X-band local oscillator signal, within a 2.4 GHz operating bandwidth, the inter-channel phase consistency is less than 10°, the inter-channel amplitude consistency is less than 1 dB, and the spurious index is better than 60 dB; for the C-band radio frequency signal and the C-band local oscillator signal, within a 1 GHz operating bandwidth, the inter-channel phase consistency is less than 10°, the inter-channel amplitude consistency is less than 1 dB, and the spurious index is better than 60 dB.

[0082] Compared with the prior art, a multi-band multi-channel microwave signal generating device provided in this embodiment sets a fixed-frequency source phase-locked loop, a frequency-hopping source phase-locked loop, a first microwave switch matrix and a second microwave switch matrix, meeting the requirements of multi-band multi-channel. The radar receiver system receives different intermediate frequency bands and down-converts them to different intermediate frequency bands. The digital signal processing system simultaneously samples and analyzes the echo signals of different intermediate frequencies, thus enabling the radar system to operate in multiple frequency bands simultaneously. The C-band frequency conversion fully reuses the X-band frequency conversion channels. By performing one-time down-conversion on the X-band radio frequency signal and the X-band local oscillator signal, the C-band radio frequency signal and the C-band local oscillator signal are output. Moreover, for each microwave channel in the X and C bands, the radio frequency signal and the local oscillator signal achieve co-channel transmission through time-division multiplexing, reducing the number of frequency-hopping source circuits used, and bringing very good benefits in aspects such as reducing volume, lowering power consumption, optimizing microwave circuits, and saving hardware costs.

[0083] Those skilled in the art can understand that all or part of the processes for implementing the methods of the above embodiments can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. Among them, the computer-readable storage medium is a disk, an optical disc, a read-only memory, or a random access memory, etc.

[0084] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi-band multi-channel microwave signal generating device, comprising a frequency hopping source circuit, a fixed-frequency source circuit, a first microwave switch matrix circuit, a second microwave switch matrix circuit, and m output channels; Each output channel has the same structure and includes a first-stage mixing circuit and a microwave frequency conversion circuit; The frequency hopping source circuit includes n frequency hopping sources; The fixed-frequency source circuit includes two fixed-frequency sources with different frequencies, namely fixed-frequency source 1 and fixed-frequency source 2; The first microwave switch matrix circuit is connected between the frequency hopping source circuit and the first-stage mixing circuits of each output channel, and is used to select a frequency hopping source for each first-stage mixing circuit as the X-band mixing local oscillator signal of each first-stage mixing circuit; The second microwave switch matrix circuit is connected between the fixed-frequency source circuit and the microwave frequency conversion circuits of each output channel, and is used to select a fixed-frequency source for each microwave frequency conversion circuit as the C-band mixing local oscillator signal of each microwave frequency conversion circuit; The first-stage mixing circuit is based on the input intermediate-frequency signal and the X-band mixing local oscillator signal, outputs an X-band radio frequency signal / X-band local oscillator signal, and distributes the X-band radio frequency signal / X-band local oscillator signal to the microwave frequency conversion circuit; The microwave frequency conversion circuit is based on the input X-band radio frequency signal / X-band local oscillator signal and the C-band mixing local oscillator signal, and outputs a C-band radio frequency signal / C-band local oscillator signal.

2. The multi-band and multi-channel microwave signal generating device according to claim 1, wherein: The first-stage mixing circuit includes a first microwave switch, a first amplifier, a first mixer, a second microwave switch, a first switch filter bank, a second amplifier, a third amplifier, and a power divider. The X-band mixing local oscillator signal is output to the first amplifier or the second microwave switch after being selected by the first microwave switch. The X-band mixing local oscillator signal is input to the first mixer after passing through the first amplifier, and is mixed with the input intermediate-frequency signal in the first mixer to obtain a radio frequency signal 1, and the radio frequency signal 1 is output to the second microwave switch. The radio frequency signal 1 or the X-band mixing local oscillator signal is sequentially output to the first switch filter bank for filtering, amplified by the second amplifier, and then power-divided by the power divider. One path of the signal is output to the third amplifier for amplification and then outputs an X-band radio frequency signal or an X-band local oscillator signal, and the other path of the signal is input to the microwave frequency conversion circuit.

3. A multi-band multi-channel microwave signal generating device according to claim 2, characterized in that: The microwave frequency conversion circuit includes a fourth amplifier, a second mixer, a second switch filter bank, and a fifth amplifier. The C-band mixing local oscillator signal is output to the second mixer after passing through the fourth amplifier, and is mixed with the other path of the signal after power division by the power divider in the second mixer to obtain a radio frequency signal 2 or a local oscillator signal 1, and the radio frequency signal 2 or the local oscillator signal 1 is sequentially output to the second switch filter bank for filtering and amplified by the fifth amplifier, and then outputs a C-band radio frequency signal or a C-band local oscillator signal.

4. A multi-band multi-channel microwave signal generating device according to claim 3, characterized in that: When the microwave frequency conversion circuit outputs a C-band radio frequency signal, the second microwave switch matrix circuit selects fixed-frequency source 1 as the C-band mixing local oscillator signal. When the microwave frequency conversion circuit outputs a C-band local oscillator signal, the second microwave switch matrix circuit selects fixed-frequency source 2 as the C-band mixing local oscillator signal.

5. A multi-band multi-channel microwave signal generating device according to claim 4, characterized in that: The multi-band multi-channel microwave signal generating device further includes a reference clock distribution circuit, and the reference clock distribution circuit provides clock reference signals for the frequency hopping source circuit, the fixed-frequency source 1, and the fixed-frequency source 2.

6. A multi-band multi-channel microwave signal generating device according to claim 5, characterized in that: The first microwave switch matrix circuit includes n one-to-m power dividers and m single-pole n-throw switches, and each power divider is connected to m switches; each power divider is connected to a frequency hopping source, and each switch is respectively connected to a first-stage mixing circuit in an output channel; The second microwave switch matrix circuit includes 2 one-to-m power dividers and m single-pole double-throw switches, each power divider is connected to a fixed-frequency source, each power divider is connected to m switches, and each switch is respectively connected to a microwave frequency conversion circuit in an output channel.

7. A multi-band multi-channel microwave signal generating device according to claim 6, characterized in that: When the frequencies of the X-band RF signals output by the output channels are the same, the frequencies of the C-band RF signals output by the output channels are also the same.

8. A multi-band multi-channel microwave signal generating device according to claim 7, characterized in that: When channels 1 to m operate at the same frequency, the first microwave switch matrix circuit selects the frequency hopping source i to provide X-band mixing local oscillator signals for the m channels; The frequency hopping source i is power-divided to provide X-band mixing local oscillator signals for channels 1 to m, where i is any number from 1 to m.

9. The multi-band multi-channel microwave signal generating device according to claim 8, characterized in that: When channels 1 to m operate at different frequencies, the first microwave switch matrix circuit selects the frequency hopping source i after power division to provide X-band mixing local oscillator signals for the channels with the same frequency.

10. A multi-band multi-channel microwave signal generating device according to claim 9, characterized in that: The operating bandwidths of the X-band RF signals and the local oscillator signals are 2.4 GHz, and the spurious index is better than 60 dB.

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