An integrated multi-standard radio frequency source

Abstract

This invention discloses an integrated multi-mode radio frequency (RF) source, which mainly comprises: an X-band semi-active RF source, a Ka-band active RF source, and an embedded digital control unit. The X-band semi-active RF source includes: an X-band semi-active straight-wave receiving channel module, a semi-active pilot module, and a semi-active local oscillator module; the Ka-band active RF source includes a Ka-band active local oscillator module and a Ka-band active main oscillator module; the embedded digital control unit is a control module. Simultaneously, the integrated multi-mode RF source also includes a reference clock source module and a power supply module. Its advantages are: this integrated multi-mode RF source, by utilizing multiple modules, responds to the RF source requirements of both X-band semi-active radar and Ka-band active radar, thus meeting the transceiver requirements of multi-mode composite radar RF sources in practical applications.

Description

Technical Field

[0001] This invention relates to the field of radar radio frequency source technology, and specifically to an integrated multi-mode radio frequency source. Background Technology

[0002] To meet the comprehensive requirements of high-end air defense missiles in terms of terminal guidance, anti-stealth capabilities, and anti-jamming capabilities, an X+Ka dual-band common-aperture composite radar guidance system is adopted to achieve complementary advantages between the two bands. Measures such as dual-difference beamforming, dual-frequency information fusion, and deception pulses are employed to counter the out-of-band deception signals radiated by the jamming source on the towed decoy flare.

[0003] As a crucial component of composite radar, the radio frequency (RF) source provides the radar's RF signal transmission and reception capabilities. With the rapid development of composite radar guidance systems, the optimal design of multi-system RF sources is a vital element supporting composite radar guidance. The integrated design of multi-system RF sources must not only meet the different operating requirements of different frequency bands but also consider interference design factors between different bands. Therefore, in practical applications, there is an urgent need for an integrated multi-system RF source that can meet the current transmission and reception requirements of multi-system composite radar RF sources.

[0004] It is understood that the above statements only provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated multi-mode radio frequency (RF) source. This integrated multi-mode RF source mainly includes an X-band semi-active RF source, a Ka-band active RF source, and a control module. The X-band semi-active RF source includes an X-band semi-active straight-wave receiving channel unit module, a semi-active pilot unit module, and a semi-active local oscillator unit module. The Ka-band active RF source includes a Ka-band active local oscillator module and a Ka-band active main oscillator module. This integrated multi-mode RF source responds to the RF source requirements of both X-band semi-active radar and Ka-band active radar through multiple modules, and can meet the transceiver requirements of multi-mode composite radar RF sources in practical applications.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] An integrated multi-mode radio frequency source, comprising:

[0008] X-band semi-active straight wave receiver channel unit module, used to generate X-band receive straight wave intermediate frequency signal;

[0009] Semi-active pilot unit module, used to generate X semi-active echo pilot signal;

[0010] Semi-active local oscillator unit module, used to generate X-band semi-active local oscillator output signal;

[0011] Ka-band active local oscillator module, used to generate Ka-band active local oscillator signal;

[0012] Ka-band active master oscillator module, used to generate Ka-band active master oscillator signal, Ka-band master oscillator monitoring signal and Ka-band active master oscillator calibration signal;

[0013] The reference clock source module is used to provide a system reference clock signal for the whole system and a module reference clock signal for at least some modules.

[0014] A control module, which is communicatively connected to an external control system, generates control commands based on communication interaction information with the external control system to control the various modules within the multi-mode radio frequency source.

[0015] The power supply module is used to supply power to each module.

[0016] Optionally, the X-band semi-active straight wave receiving channel unit module includes:

[0017] The three-way switch, the receiving channel power divider amplifier, the receiving channel mixer, and the receiving channel filter amplifier are connected in sequence. The three-way switch is used to receive and filter external input signals and send the filtered external input signals to the receiving channel power divider amplifier for power division amplification. The power-divided signal and the straight wave local oscillator signal generated by the semi-active local oscillator unit module are mixed by the receiving channel mixer and then filtered and amplified by the receiving channel filter amplifier to output the corresponding X-band receiving straight wave intermediate frequency signal.

[0018] The control module generates an antenna switching signal or a pilot control signal and sends it to the three-way selector switch to control it to filter external input signals. After receiving the antenna switching signal, the three-way selector switch receives and outputs the first antenna signal or the second antenna signal, amplifies and down-converts it, and then sends it to the external control system through the control module. After receiving the pilot control signal, the three-way selector switch receives and outputs the straight wave pilot signal generated by the semi-active pilot unit module, amplifies and down-converts it to output the X-band receiving straight wave intermediate frequency signal.

[0019] Optionally, the semi-active pilot unit module includes:

[0020] The pilot digital phase-locked source, pilot power divider amplifier, pilot filter amplifier, and pilot coupler are connected in sequence. The pilot digital phase-locked source receives the control command from the control module and performs fractional frequency division and phase locking to obtain the pilot source signal. The pilot source signal is amplified and filtered by the pilot power divider amplifier and the pilot filter amplifier, and then coupled into two paths at the pilot coupler. One path is sent as a straight wave pilot signal to the X-band semi-active straight wave receiving channel unit module, and the other path is output as an X-band semi-active echo pilot signal.

[0021] Optionally, the semi-active local oscillator unit module includes:

[0022] The first DDS signal generator, the first semi-active local oscillator mixer, the first semi-active local oscillator filter amplifier, the second semi-active local oscillator mixer, the second semi-active local oscillator filter amplifier, and the semi-active local oscillator coupler are connected in sequence.

[0023] The control module controls the first DDS signal generator to generate a first DDS signal for fine-tuning the frequency in point-frequency mode and sends it to the first semi-active local oscillator mixer. The comb spectrum generator generates a first point-frequency source signal. The first semi-active local oscillator mixer mixes the first DDS signal with the first point-frequency source signal. The mixed signal is filtered and amplified by the first semi-active local oscillator filter amplifier. The filtered and amplified signal is mixed with the first frequency-hopping source signal generated by the semi-active local oscillator digital phase-locked source controlled by the control module at the second semi-active local oscillator mixer. Then it is filtered and amplified by the second semi-active local oscillator filter amplifier. The filtered and amplified signal is coupled into two paths by the semi-active local oscillator coupler. One path is sent directly to the X-band semi-active direct-wave receiving channel unit module as a straight-wave local oscillator signal, and the other path is output as the X-band semi-active local oscillator output signal.

[0024] Optionally, the Ka-band active local oscillator module includes:

[0025] The following components are connected in sequence: a second DDS signal generator, a first active local oscillator mixer, a first active local oscillator filter amplifier, a second active local oscillator mixer, a second active local oscillator filter amplifier, a third active local oscillator mixer, a third active local oscillator filter amplifier, an active local oscillator power divider, an active local oscillator frequency multiplier, and a fourth active local oscillator filter amplifier.

[0026] The control module controls the second DDS signal generator to generate a step frequency signal. The first active local oscillator mixer mixes the step frequency signal with the third point frequency source signal generated by the first active local oscillator digital phase-locked source controlled by the control module. The signal is then filtered and amplified by the first active local oscillator filter amplifier. The second active local oscillator mixer mixes the filtered and amplified signal with the second point frequency source signal generated by the comb spectrum generator. The mixed signal is then filtered and amplified by the second active local oscillator filter amplifier. The filtered and amplified signal and the second frequency hopping source signal generated by the second active local oscillator digital phase-locked source controlled by the control module are then mixed and filtered and amplified sequentially by the third active local oscillator mixer and the third active local oscillator filter amplifier. The signal is then divided into two paths by the active local oscillator power divider. One path is used as a Ku-band frequency hopping signal and enters the Ka-band active main oscillator module. The other path is multiplied by 2 by the active local oscillator frequency multiplier and then filtered and amplified by the fourth active local oscillator filter amplifier to be output as the Ka-band active local oscillator signal.

[0027] Optionally, the comb spectrum generator includes:

[0028] The system consists of a matching circuit, a step transistor, a filter amplifier circuit, a first power divider, and a frequency multiplier filter amplifier link connected in sequence. The matching circuit and the step transistor serve as a comb spectrum generation module to generate various 100MHz reference signal harmonic signals. The filter amplifier circuit selects the S-band point frequency signal for filtering and amplification, and then the signal is divided into two paths by the first power divider. One path generates the first point frequency source signal after being frequency multiplied by 4 and filtered and amplified, while the other path generates the second point frequency source signal after being frequency multiplied by 6 and filtered and amplified.

[0029] Optionally, the Ka-band active master oscillator module includes:

[0030] The following components are connected in sequence: an active master oscillation digital phase-locked source, a first active master oscillation power divider, a first active master oscillation mixer, a first active master oscillation filter amplifier, a second active master oscillation mixer, a second active master oscillation filter amplifier, an active master oscillation frequency multiplier, a third active master oscillation filter amplifier, an active master oscillation coupler, and a first active master oscillation switch. The active master oscillation coupler is also connected to the second active master oscillation power divider. The second active master oscillation power divider is connected to both a detector amplifier and a second active master oscillation switch. The first active master oscillation power divider is also connected to the third active master oscillation mixer. The third active master oscillation mixer, a fourth active master oscillation filter amplifier, and the second active master oscillation mixer are connected in sequence.

[0031] The control module controls the active master oscillator digital phase-locked source to generate a fourth frequency signal. The power divider divides the fourth frequency signal into two signals. One signal is sent to the first active master oscillator mixer to mix with a Ku-band frequency-hopping signal transmitted from the Ka-band active local oscillator module. The mixed signal is then filtered and amplified by the first active master oscillator filter amplifier and sent as the first signal to the second active master oscillator mixer. The other signal is sent to the third active master oscillator mixer to mix with a linear frequency modulated signal generated by the third DDS signal generator controlled by the control module. The mixed signal is then filtered and amplified by the fourth active master oscillator filter amplifier and sent as the second signal to the second active master oscillator mixer. The second active master oscillator mixer mixes the first and second signals. The mixed signal is then filtered and amplified by the second active master oscillator filter amplifier, and then multiplied by 2 by the active master oscillator frequency multiplier. The multiplied signal is then filtered and amplified by the third active master oscillator filter amplifier and then sent to the active master oscillator coupler for coupling. One signal from the active master oscillator coupler passes through the first active master oscillator switch and is output as the Ka-band active master oscillator signal. The coupled signal from the active master oscillator coupler is divided by the second active master oscillator power divider. One signal is detected by the detector amplifier to form the Ka-band master oscillator monitoring signal output, and the other signal passes through the second active master oscillator switch and is output as the Ka-band active master oscillator calibration signal output.

[0032] Optionally, the reference clock source module includes:

[0033] The temperature-compensated crystal oscillator, clock power divider amplifier, clock filter amplifier, and clock power divider are connected in sequence.

[0034] The temperature-compensated crystal oscillator generates a 100MHz point frequency reference signal. The 100MHz point frequency reference signal is sequentially amplified and filtered by a clock power divider and a clock filter amplifier to obtain a clock source signal. The clock source signal is divided by a clock power divider, with one path output as the system reference clock signal and the other path sent as the module reference clock signal to the X-band semi-active direct wave receiving channel unit module and / or the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module and / or the control module.

[0035] Optionally, the control module includes:

[0036] An embedded control module that communicates with an external control system;

[0037] The control module is connected to an external control system via an RS422 circuit. The control module is connected to the RS422 circuit via the RS422 interface driver module. The control module and the external control system exchange information based on the RS422 communication protocol. The RS422 protocol parsing and packaging module is used to parse and package the exchanged information data.

[0038] The SPI port driver module, the control module, is connected to the X-band semi-active direct wave receiving channel unit module and / or semi-active pilot unit module and / or semi-active local oscillator unit module and / or Ka-band active local oscillator source module and / or Ka-band active main oscillator source module via an SPI bus. The X-band semi-active direct wave receiving channel unit module and / or semi-active pilot unit module and / or semi-active local oscillator unit module and / or Ka-band active local oscillator source module and / or Ka-band active main oscillator source module are respectively provided with SPI bus interfaces.

[0039] A digital phase-locked source interface control module, wherein the control module is communicatively connected to the corresponding digital phase-locked source in the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator module and / or the Ka-band active main oscillator module through the digital phase-locked source interface control module;

[0040] The DDS interface control module is connected to the corresponding DDS signal generator in the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module through the DDS interface control module.

[0041] Optionally, the power module includes a first power module and a second power module. The integrated multi-mode RF source includes an upper cavity and a lower cavity. The upper cavity includes multiple upper cavity electromagnetic shielding boxes, and the lower cavity includes multiple lower cavity electromagnetic shielding boxes. Both the upper cavity electromagnetic shielding boxes and the lower cavity electromagnetic shielding boxes are double-layered box structures with laser sealing. The upper cavity electromagnetic shielding box is equipped with an X-band semi-active direct wave receiving channel unit module, a semi-active pilot unit module, a semi-active local oscillator unit module, a reference clock source module, a control module, or a first power module. The lower cavity electromagnetic shielding box is equipped with a Ka-band active local oscillator source module, a Ka-band active main oscillator source module, or a second power module. The first power module is used to power the various modules in the upper cavity, and the second power module is used to power the various modules in the lower cavity.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] This invention provides an integrated multi-mode radio frequency source, designed for both X and Ka bands, satisfying the X-band echo local oscillator requirements, X-band pilot requirements, and semi-active straight wave requirements; satisfying the Ka-band transmit radio frequency requirements, receive local oscillator requirements, and line-fed calibration signal requirements; and capable of meeting frequency and waveform configuration requirements through software and stable RS422 communication.

[0044] Furthermore, the RF source adopts a layered technology, with the integrated RF source arranged in upper and lower cavities to achieve a design that prevents interference between the X and Ka bands; all modules are laser-sealed to ensure the sealing of the bare chips and improve the reliability of the modules in harsh working environments.

[0045] Furthermore, this invention designs different radio frequency parameters for the two bands, so that the higher harmonics of the X band will not fall into the signal band of the Ka band, ensuring that they do not overlap or interfere with each other.

[0046] Furthermore, the RF source employs a reasonable layout to minimize signal crossover and interference between different signals; sufficient power supply filtering is used to reduce the impact of the power supply on performance indicators and the impact of the module on other modules and the entire device, ensuring reliable circuit operation. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of an integrated multi-system radio frequency source according to the present invention;

[0048] Figure 2 This is a schematic diagram of a comb spectrum generator according to the present invention. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and by providing a detailed description of a preferred embodiment.

[0050] like Figure 1 As shown, this invention provides an integrated multi-mode radio frequency (RF) source, which mainly comprises: an X-band semi-active RF source, a Ka-band active RF source, and an embedded digital control unit. The X-band semi-active RF source includes: an X-band semi-active straight-wave receiving channel unit module, a semi-active pilot unit module, and a semi-active local oscillator unit module; the Ka-band active RF source includes a Ka-band active local oscillator source module and a Ka-band active main oscillator source module; the embedded digital control unit is a control module, i.e., an embedded control module. Additionally, this integrated multi-mode RF source also includes a reference clock source module and a power supply module.

[0051] The X-band semi-active straight-wave receiving channel module generates an X-band received straight-wave intermediate frequency signal; the semi-active pilot module generates an X-band semi-active echo pilot signal; the semi-active local oscillator module generates an X-band semi-active local oscillator output signal; the Ka-band active local oscillator source module generates a Ka-band active local oscillator signal; the Ka-band active master oscillator source module generates a Ka-band active master oscillator signal, a Ka-band master oscillator monitoring signal, and a Ka-band active master oscillator calibration signal; the reference clock source module provides a system reference clock signal for the whole system and a module reference clock signal for at least some modules; the control module is communicatively connected to an external control system, and generates control commands based on communication interaction information with the external control system to control each module within the multi-mode RF source; the power supply module supplies power to each module.

[0052] In this embodiment, anti-interference design is adopted for both X and Ka bands, employing a layered technology (divided into upper and lower layers). Specifically, the integrated multi-mode RF source includes an upper cavity (upper layer) and a lower cavity (lower layer). The upper cavity contains multiple upper cavity electromagnetic shielding boxes (closed boxes with covers, leaving only some wiring ports), and the lower cavity contains multiple lower cavity electromagnetic shielding boxes. Both the upper and lower cavity electromagnetic shielding boxes are double-layered cover structures with laser sealing. Compared to a single-layer cover structure, the double-layered cover structure provides an additional attenuation, significantly improving the shielding effect. The boxes fit tightly with the inner cover, ensuring good surface contact and enhancing the shielding effect. Optionally, the power module includes a first power module and a second power module. The first power module is located in the upper cavity, supplying power to the various modules within the upper cavity, and the second power module is located in the lower cavity, supplying power to the various modules within the lower cavity.

[0053] The upper cavity electromagnetic shielding box houses an X-band semi-active direct wave receiving channel unit module, a semi-active pilot unit module, a semi-active local oscillator unit module, a reference clock source module, a control module, or a first power supply module; that is, the upper layer contains these modules. The lower cavity electromagnetic shielding box houses a Ka-band active local oscillator source module, a Ka-band active main oscillator source module, or a second power supply module; that is, the lower layer contains these modules. Each module is individually encapsulated in an electromagnetic shielding box, which can optionally be separated by partitions. The box body is made of rust-resistant aluminum with an anodized surface treatment. The box body is laser-sealed to ensure the airtightness of the bare chip and improve the reliability of the corresponding module in harsh working environments. Optionally, the power supply module and control module are coated with a three-proof coating. Each module communicates with other modules to achieve information exchange.

[0054] like Figure 1As shown, the control module includes an embedded control module, namely an FPGA circuit and a functional software module, which is communicatively connected to an external control system. Optionally, the external control system is a digital signal processor. The signal frequency, output signal form, and signal waveform of the RF source in this application are all controlled by the digital signal processor.

[0055] Furthermore, the control module also includes an RS422 interface driver module and an RS422 protocol parsing and packaging module. The control module connects to an external control system via an RS422 circuit. The interface is an RS422 bus. The control module and the external control system exchange information based on the standard RS422 communication protocol (including the transmission of configuration information, frequency information, DDS frequency control words, signal format, and a three-way channel switching switch). The RS422 protocol parsing and packaging module is used to parse and package the exchanged information data. In other words, the entire RF source uses RS422 for external communication, enabling frequency control, signal format control, signal on / off control, and modulation control of X-band and Ka-band RF signals.

[0056] Furthermore, the control module also includes an SPI port driver module, a digital phase-locked loop (PLL) interface control module (HMC3834 PLL interface control module), and a DDS interface control module (DDS chip interface control module). The control module is connected to the X-band semi-active direct-wave receiving channel unit module and / or the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module via an SPI bus. Each of the X-band semi-active direct-wave receiving channel unit module and / or the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module is equipped with an SPI bus interface. The control module configures the registers of the phase-locked loop chip HMC834 of each unit via the SPI bus according to the received and parsed RS422 protocol, thereby generating the phase-locked output point frequency or frequency hopping signal; according to the received and parsed RS422 protocol, it configures the DDS-chip AD9910 (frequency point, starting phase, starting frequency and other parameters) to complete the generation of linear frequency modulation signal.

[0057] The control module communicates with the corresponding digital phase-locked sources in the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator module and / or the Ka-band active main oscillator module via a digital phase-locked source interface control module. The control module also communicates with the corresponding DDS signal generators in the semi-active local oscillator unit module and / or the Ka-band active local oscillator module and / or the Ka-band active main oscillator module via a DDS interface control module.

[0058] Furthermore, the X-band semi-active straight-wave receiving channel unit module has the function of amplifying and down-converting the received external input signal to an intermediate frequency (IF), and then outputting it as an X-band straight-wave IF signal. The external input signal received by the X-band semi-active straight-wave receiving channel unit module includes a first antenna signal (Antenna 1 signal), a second antenna signal (Antenna 2 signal), and a straight-wave pilot signal. The first and second antenna signals are external electromagnetic wave signals, typically ground radar illumination signals carrying illumination information.

[0059] like Figure 1 As shown, the X-band semi-active straight-wave receiving channel unit module specifically includes: a three-way selector switch, a receiving channel power divider amplifier, a receiving channel mixer, and a receiving channel filter amplifier connected in sequence. The three-way selector switch is used to receive and filter external input signals, and send the filtered external input signals to the receiving channel power divider amplifier for power amplification. The power-amplified signal and the straight-wave local oscillator signal generated by the semi-active local oscillator unit module are mixed by the receiving channel mixer, and then filtered and amplified by the receiving channel filter amplifier to output the corresponding X-band receiving straight-wave intermediate frequency signal.

[0060] In this embodiment, the control module generates an antenna switching signal or a pilot control signal and sends it to the three-way switch to control the filtering and switching of the received external input signals. That is, the three sets of input signals are switched by the antenna switching signal and the pilot control signal. The embedded control module sends the two control signals to the corresponding chip through the SPI bus.

[0061] After receiving the antenna switching signal, the three-way switch receives and outputs either the first antenna signal or the second antenna signal, amplifies and down-converts it, and then sends it to the external control system via the control module for signal processing and detection. After receiving the pilot control signal, the three-way switch receives and outputs the straight-wave pilot signal generated by the semi-active pilot unit module, amplifies and down-converts it to output the X-band receiving straight-wave intermediate frequency signal, which is used for phase and amplitude calibration of the X-band semi-active straight-wave receiving channel unit module.

[0062] like Figure 1As shown, the semi-active pilot unit module includes: a pilot digital phase-locked source (PLL chip 1, HMC783), a pilot power divider amplifier, a pilot filter amplifier, and a pilot coupler connected in sequence. The pilot digital PLL receives control commands from the control module and performs fractional-number frequency division and phase-locking to obtain the pilot source signal. This pilot source signal is then amplified and filtered by the pilot power divider amplifier and the pilot filter amplifier before being coupled into two paths at the pilot coupler. One path is sent as a straight-wave pilot signal to the X-band semi-active straight-wave receiving channel unit module, where it is received via a three-way selector and then mixed to obtain a straight-wave intermediate frequency signal. The other path is coupled as an X-band semi-active echo pilot signal for output. The pilot frequency of the semi-active pilot unit module is controlled by an external control system via the RS422 communication protocol. The external control system controls the embedded control module FPGA chip via the RS422 communication protocol to generate the control timing for the PLL chip 1 (HMC783), controlling the output signal frequency of the PLL chip 1. Its frequency switching is synchronized with the semi-active local oscillator unit module.

[0063] like Figure 1 As shown, the semi-active local oscillator unit module is an X-band semi-active local oscillator source 1. The module includes: a small-step first DDS signal generator (DDS1 chip, AD9910), a first semi-active local oscillator mixer, a first semi-active local oscillator filter amplifier, a second semi-active local oscillator mixer, a second semi-active local oscillator filter amplifier, and a semi-active local oscillator coupler connected in sequence.

[0064] The control module controls the first DDS signal generator to generate a first DDS signal for fine-tuning the frequency in point-frequency mode and sends it to the first semi-active local oscillator mixer. The comb spectrum generator selects and generates a first point-frequency source signal (point-frequency source 1 signal). The first semi-active local oscillator mixer mixes the first DDS signal with the first point-frequency source signal. The mixed signal is filtered and amplified by the first semi-active local oscillator filter amplifier. The filtered and amplified signal is mixed with the first frequency-hopping source signal (frequency-hopping source 1 signal) generated by the semi-active local oscillator digital phase-locked source (phase-locked loop chip 2, HMC834) controlled by the control module at the second semi-active local oscillator mixer. Then, it is filtered and amplified by the second semi-active local oscillator filter amplifier. The filtered and amplified signal is coupled into two paths by the semi-active local oscillator coupler. One path is sent directly as a straight-wave local oscillator signal to the X-band semi-active straight-wave receiving channel unit module, and the other path is output as the X-band semi-active local oscillator output signal. The frequency control of the semi-active local oscillator unit module is controlled by an external control system through the RS422 communication protocol. The RS422 communication protocol controls the embedded control module FPGA chip to generate the control timing of the phase-locked loop chip 2 (HMC834) and control the output signal frequency of the phase-locked loop chip.

[0065] like Figure 2As shown, the comb spectrum generator consists of a matching circuit, a step transistor, a filter amplifier circuit, a first power divider, and a frequency multiplication filter amplifier link. The matching circuit and the step transistor serve as the comb spectrum generation module, generating various 100MHz reference signal harmonic signals. The filter amplifier circuit selects the S-band point frequency signal for filtering and amplification, and then divides it into two paths by the first power divider. One path is frequency multiplication by 4 to generate the first point frequency source signal, i.e., point frequency source 1 signal, after filtering and amplification. The other path is frequency multiplication by 6 to generate the second point frequency source signal, i.e., point frequency source 2 signal. Point frequency source 1 signal serves as the first-stage mixing local oscillator signal of the semi-active local oscillator unit module, while point frequency source 2 signal is input to the Ka-band active local oscillator module.

[0066] like Figure 1 As shown, the Ka-band active local oscillator module includes: a second DDS signal generator (DDS2 chip, AD9910), a first active local oscillator mixer, a first active local oscillator filter amplifier, a second active local oscillator mixer, a second active local oscillator filter amplifier, a third active local oscillator mixer, a third active local oscillator filter amplifier, an active local oscillator power divider, an active local oscillator frequency multiplier, and a fourth active local oscillator filter amplifier connected in sequence.

[0067] In this embodiment, the active local oscillator signal is achieved through three-stage mixing. The control module controls the second DDS signal generator to generate a step frequency signal. The first active local oscillator mixer mixes the step frequency signal with the third point frequency source signal (point frequency 3 signal) generated by the first active local oscillator digital phase-locked source (PLL chip 3, HMC834) controlled by the control module. The signal is then filtered and amplified by the first active local oscillator filter amplifier. The second active local oscillator mixer mixes the filtered and amplified signal with the second point frequency source signal (point frequency source 2 signal) generated by the comb spectrum generator. The mixed signal is then further processed by the second active local oscillator filter amplifier. The signal undergoes filtering and amplification. The filtered and amplified signal, along with the second frequency-hopping source signal (frequency-hopping source 2 signal) generated by the second active local oscillator digital phase-locked source (PLL chip 4, HMC834) controlled by the control module, is sequentially mixed and filtered by the third active local oscillator mixer and the third active local oscillator filter amplifier. Then, it is divided into two paths by the active local oscillator power divider. One path serves as the Ku-band frequency-hopping signal and enters the Ka-band active main oscillator module. The other path is multiplied by two by the active local oscillator frequency multiplier and then filtered and amplified by the fourth active local oscillator filter amplifier to serve as the Ka-band active local oscillator signal output. The frequency control of the Ka-band active local oscillator module is controlled by an external control system via the RS422 communication protocol.

[0068] like Figure 1As shown, the Ka-band active oscillator module includes: an active oscillator digital phase-locked source (phase-locked loop chip 5, HMC834), a first active oscillator power divider, a first active oscillator mixer, a first active oscillator filter amplifier, a second active oscillator mixer, a second active oscillator filter amplifier, an active oscillator frequency multiplier, a third active oscillator filter amplifier, an active oscillator coupler, and a first active oscillator switch, all connected in sequence. The active oscillator coupler is also connected to the second active oscillator power divider. The second active oscillator power divider is connected to a detector amplifier and a second active oscillator switch, respectively. The first active oscillator power divider is also connected to the third active oscillator mixer. The third active oscillator mixer, the fourth active oscillator filter amplifier, and the second active oscillator mixer are connected in sequence.

[0069] In this embodiment, the main oscillator signal is achieved through three-stage mixing. The control module controls the active main oscillator digital phase-locked source to generate a fourth point-frequency signal (point-frequency 4 signal). The power divider divides the fourth point-frequency signal into two signals. One signal is sent to the first active main oscillator mixer to mix with the Ku-band frequency-hopping signal transmitted from the Ka-band active local oscillator module. The mixed signal is then filtered and amplified by the first active main oscillator filter amplifier and sent to the second active main oscillator mixer as the first signal (the mixed local oscillator signal). The other signal is sent to the third active main oscillator mixer to mix with the linear frequency modulated signal generated by the third DDS signal generator (DDS3 chip, AD9910) controlled by the control module. The mixed signal is then filtered and amplified by the fourth active main oscillator filter amplifier and sent to the second signal (…). The intermediate frequency signal (IF signal from harmonic mixing) is sent to the second active master oscillator mixer. The second active master oscillator mixer mixes the first and second signals. The mixed signal is then filtered and amplified by the second active master oscillator filter amplifier, and then multiplied by 2 by the active master oscillator frequency multiplier. The multiplied signal is then filtered and amplified by the third active master oscillator filter amplifier and sent to the active master oscillator coupler for coupling. One signal from the active master oscillator coupler passes through the first active master oscillator switch and is output as the Ka-band active master oscillator signal. The coupled signal from the active master oscillator coupler is divided by the second active master oscillator power divider. One signal is detected by a detector amplifier to form a Ka-band master oscillator monitoring signal output, and the other signal passes through the second active master oscillator switch and is output as a Ka-band active master oscillator calibration signal output. The frequency control of the Ka-band active master oscillator module is controlled by the RS422 communication protocol, and its switching is synchronized with the active local oscillator. The active master oscillator waveform includes three modes: point frequency, step frequency (following the local oscillator) + linear frequency modulation. The waveform control mode is controlled by an external control system via the RS422 communication protocol to generate waveforms with different frequencies, bandwidths, and pulse widths. As described above, the Ka-band active master oscillator module also includes a Ka-band active calibration source. After coupling, the master oscillator signal is directly coupled through a switch to output the Ka-band active master oscillator signal. The other coupled path is power-splittered and then connected to a single-pole single-throw switch (the second active master oscillator switch) to output the Ka-band active master oscillator calibration signal. The output of this calibration signal is controlled via the RS422 communication protocol.

[0070] like Figure 1 As shown, the reference clock source module includes: a temperature-compensated crystal oscillator, a clock power divider amplifier, a clock filter amplifier, and a clock power divider connected in sequence.

[0071] The temperature-compensated crystal oscillator generates a 100MHz point frequency reference signal. The 100MHz point frequency reference signal is sequentially amplified and filtered by a clock power divider and a clock filter amplifier to obtain a clock source signal. The clock source signal is divided by a clock power divider, one path of which is output as a system reference clock signal (providing the system clock and synchronization clock), and the other path is sent as a module reference clock signal (100MHz reference clock signal) to the X-band semi-active direct wave receiving channel unit module and / or the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module and / or the control module.

[0072] Furthermore, the integrated multi-mode RF source of this invention also includes a power supply filtering design: the RF source requires various voltage values ​​for operation, and the power module regulates the RF source input power to these various voltage values ​​using a linear regulator. Filtering capacitors are used at the input and output ports of the linear regulator for filtering. In circuit design, electromagnetic compatibility considerations mainly focus on power supply filtering and circuit layout. Power supply filtering must consider the response at different frequencies, and the selection of filter capacitors takes into account high, medium, and low frequencies. Power supply bias decoupling for each stage of amplification devices is achieved through measures such as parallel filtering with multiple capacitors.

[0073] The integrated multi-mode radio frequency source provided by this invention mainly includes an X-band semi-active radio frequency source, a Ka-band active radio frequency source, and a control module. The X-band semi-active radio frequency source includes an X-band semi-active direct wave receiving channel unit module, a semi-active pilot unit module, and a semi-active local oscillator unit module. The Ka-band active radio frequency source includes a Ka-band active local oscillator module and a Ka-band active main oscillator module. This integrated multi-mode radio frequency source integrates a radio frequency transceiver circuit module, a down-conversion circuit module, and an embedded digital circuit module. By utilizing multiple modules, it can respond to the radio frequency source requirements of both X-band semi-active radar and Ka-band active radar, thus meeting the transceiver requirements of multi-mode composite radar radio frequency sources in practical applications.

[0074] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. An integrated multi-standard radio frequency source, characterized by, Include: X-band semi-active straight wave receiver channel unit module, used to generate X-band receive straight wave intermediate frequency signal; Semi-active pilot unit module, used to generate X semi-active echo pilot signal; Semi-active local oscillator unit module, used to generate X-band semi-active local oscillator output signal; Ka-band active local oscillator module, used to generate Ka-band active local oscillator signal; Ka-band active master oscillator module, used to generate Ka-band active master oscillator signal, Ka-band master oscillator monitoring signal and Ka-band active master oscillator calibration signal; The reference clock source module is used to provide a system reference clock signal for the whole system and a module reference clock signal for at least some modules. A control module, which is communicatively connected to an external control system, generates control commands based on communication interaction information with the external control system to control the various modules within the multi-mode radio frequency source. The power supply module is used to supply power to each module; The X-band semi-active straight wave receiving channel unit module includes: The three-way switch, the receiving channel power divider amplifier, the receiving channel mixer, and the receiving channel filter amplifier are connected in sequence. The three-way switch is used to receive and filter external input signals and send the filtered external input signals to the receiving channel power divider amplifier for power division amplification. The power-divided signal and the straight wave local oscillator signal generated by the semi-active local oscillator unit module are mixed by the receiving channel mixer and then filtered and amplified by the receiving channel filter amplifier to output the corresponding X-band receiving straight wave intermediate frequency signal. The control module generates an antenna switching signal or a pilot control signal and sends it to the three-way selector switch to control it to filter external input signals. After receiving the antenna switching signal, the three-way selector switch receives and outputs the first antenna signal or the second antenna signal, amplifies and down-converts it, and then sends it to the external control system through the control module. After receiving the pilot control signal, the three-way selector switch receives and outputs the straight wave pilot signal generated by the semi-active pilot unit module, amplifies and down-converts it to output the X-band receiving straight wave intermediate frequency signal.

2. The integrated multi -body radio frequency source of claim 1, wherein, The semi-active pilot unit module includes: The pilot digital phase-locked source, pilot power divider amplifier, pilot filter amplifier, and pilot coupler are connected in sequence. The pilot digital phase-locked source receives the control command from the control module and performs fractional frequency division and phase locking to obtain the pilot source signal. The pilot source signal is amplified and filtered by the pilot power divider amplifier and the pilot filter amplifier, and then coupled into two paths at the pilot coupler. One path is sent as a straight wave pilot signal to the X-band semi-active straight wave receiving channel unit module, and the other path is output as an X-band semi-active echo pilot signal.

3. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The semi-active local oscillator module includes: The first DDS signal generator, the first semi-active local oscillator mixer, the first semi-active local oscillator filter amplifier, the second semi-active local oscillator mixer, the second semi-active local oscillator filter amplifier, and the semi-active local oscillator coupler are connected in sequence. The control module controls the first DDS signal generator to generate a first DDS signal for fine-tuning the frequency in point-frequency mode and sends it to the first semi-active local oscillator mixer. The comb spectrum generator generates a first point-frequency source signal. The first semi-active local oscillator mixer mixes the first DDS signal with the first point-frequency source signal. The mixed signal is filtered and amplified by the first semi-active local oscillator filter amplifier. The filtered and amplified signal is mixed with the first frequency-hopping source signal generated by the semi-active local oscillator digital phase-locked source controlled by the control module at the second semi-active local oscillator mixer. Then it is filtered and amplified by the second semi-active local oscillator filter amplifier. The filtered and amplified signal is coupled into two paths by the semi-active local oscillator coupler. One path is sent directly to the X-band semi-active direct-wave receiving channel unit module as a straight-wave local oscillator signal, and the other path is output as the X-band semi-active local oscillator output signal.

4. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The Ka-band active local oscillator module includes: The following components are connected in sequence: a second DDS signal generator, a first active local oscillator mixer, a first active local oscillator filter amplifier, a second active local oscillator mixer, a second active local oscillator filter amplifier, a third active local oscillator mixer, a third active local oscillator filter amplifier, an active local oscillator power divider, an active local oscillator frequency multiplier, and a fourth active local oscillator filter amplifier. The control module controls the second DDS signal generator to generate a step frequency signal. The first active local oscillator mixer mixes the step frequency signal with the third point frequency source signal generated by the first active local oscillator digital phase-locked source controlled by the control module. The signal is then filtered and amplified by the first active local oscillator filter amplifier. The second active local oscillator mixer mixes the filtered and amplified signal with the second point frequency source signal generated by the comb spectrum generator. The mixed signal is then filtered and amplified by the second active local oscillator filter amplifier. The filtered and amplified signal and the second frequency hopping source signal generated by the second active local oscillator digital phase-locked source controlled by the control module are then mixed and filtered and amplified sequentially by the third active local oscillator mixer and the third active local oscillator filter amplifier. The signal is then divided into two paths by the active local oscillator power divider. One path is used as a Ku-band frequency hopping signal and enters the Ka-band active main oscillator module. The other path is multiplied by 2 by the active local oscillator frequency multiplier and then filtered and amplified by the fourth active local oscillator filter amplifier to be output as the Ka-band active local oscillator signal.

5. The integrated multi-mode radio frequency source as described in claim 3 or 4, characterized in that, The comb spectrum generator includes: The system consists of a matching circuit, a step transistor, a filter amplifier circuit, a first power divider, and a frequency multiplier filter amplifier link connected in sequence. The matching circuit and the step transistor serve as a comb spectrum generation module to generate various 100MHz reference signal harmonic signals. The filter amplifier circuit selects the S-band point frequency signal for filtering and amplification, and then the signal is divided into two paths by the first power divider. One path generates the first point frequency source signal after being frequency multiplied by 4 and filtered and amplified, while the other path generates the second point frequency source signal after being frequency multiplied by 6 and filtered and amplified.

6. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The Ka-band active master oscillator module includes: The following components are connected in sequence: an active master oscillation digital phase-locked source, a first active master oscillation power divider, a first active master oscillation mixer, a first active master oscillation filter amplifier, a second active master oscillation mixer, a second active master oscillation filter amplifier, an active master oscillation frequency multiplier, a third active master oscillation filter amplifier, an active master oscillation coupler, and a first active master oscillation switch. The active master oscillation coupler is also connected to the second active master oscillation power divider. The second active master oscillation power divider is connected to both a detector amplifier and a second active master oscillation switch. The first active master oscillation power divider is also connected to the third active master oscillation mixer. The third active master oscillation mixer, a fourth active master oscillation filter amplifier, and the second active master oscillation mixer are connected in sequence. The control module controls the active main oscillator digital phase-locked source to generate a fourth frequency signal. The first active main oscillator power divider divides the fourth frequency signal into two signals. One signal is sent to the first active main oscillator mixer and mixed with a Ku-band frequency-hopping signal transmitted from the Ka-band active local oscillator module. The mixed signal is then filtered and amplified by the first active main oscillator filter amplifier and sent as the first signal to the second active main oscillator mixer. The other signal is sent to the third active main oscillator mixer and mixed with a linear frequency modulation signal generated by the third DDS signal generator controlled by the control module. The mixed signal is then filtered and amplified by the fourth active main oscillator filter amplifier and sent as the second signal to the second active main oscillator. The mixer, specifically the second active oscillator mixer, mixes the first and second signals. The mixed signals are then filtered and amplified by the second active oscillator filter amplifier, and then multiplied by 2 by the active oscillator frequency multiplier. The multiplied signals are then filtered and amplified by the third active oscillator filter amplifier and sent to the active oscillator coupler for coupling. One signal from the active oscillator coupler passes through the first active oscillator switch and is output as the Ka-band active oscillator signal. The coupled signal from the active oscillator coupler is divided by the second active oscillator power divider. One signal is detected by the detector amplifier to form the Ka-band active oscillator monitoring signal output, and the other signal passes through the second active oscillator switch and is output as the Ka-band active oscillator calibration signal output.

7. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The reference clock source module includes: The temperature-compensated crystal oscillator, clock power divider amplifier, clock filter amplifier, and clock power divider are connected in sequence. The temperature-compensated crystal oscillator generates a 100MHz point frequency reference signal. The 100MHz point frequency reference signal is sequentially amplified and filtered by a clock power divider and a clock filter amplifier to obtain a clock source signal. The clock source signal is divided by a clock power divider, with one path output as the system reference clock signal and the other path sent as the module reference clock signal to the X-band semi-active direct wave receiving channel unit module and / or the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module and / or the control module.

8. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The control module includes: An embedded control module that communicates with an external control system; The control module is connected to an external control system via an RS422 circuit. The control module is connected to the RS422 circuit via the RS422 interface driver module. The control module and the external control system exchange information based on the RS422 communication protocol. The RS422 protocol parsing and packaging module is used to parse and package the exchanged information data. The SPI port driver module, the control module, is connected to the X-band semi-active direct wave receiving channel unit module and / or semi-active pilot unit module and / or semi-active local oscillator unit module and / or Ka-band active local oscillator source module and / or Ka-band active main oscillator source module via an SPI bus. The X-band semi-active direct wave receiving channel unit module and / or semi-active pilot unit module and / or semi-active local oscillator unit module and / or Ka-band active local oscillator source module and / or Ka-band active main oscillator source module are respectively provided with SPI bus interfaces. A digital phase-locked source interface control module, wherein the control module is communicatively connected to the corresponding digital phase-locked source in the semi-active pilot unit module and / or the semi-active local oscillator unit module and / or the Ka-band active local oscillator module and / or the Ka-band active main oscillator module through the digital phase-locked source interface control module; The DDS interface control module is connected to the corresponding DDS signal generator in the semi-active local oscillator unit module and / or the Ka-band active local oscillator source module and / or the Ka-band active main oscillator source module through the DDS interface control module.

9. The integrated multi-system radio frequency source as described in claim 1, characterized in that, The power module includes a first power module and a second power module. The integrated multi-mode RF source includes an upper cavity and a lower cavity. The upper cavity includes multiple upper cavity electromagnetic shielding boxes, and the lower cavity includes multiple lower cavity electromagnetic shielding boxes. Both the upper cavity electromagnetic shielding boxes and the lower cavity electromagnetic shielding boxes are double-layered box structures with laser sealing. The upper cavity electromagnetic shielding box is equipped with an X-band semi-active direct wave receiving channel unit module, a semi-active pilot unit module, a semi-active local oscillator unit module, a reference clock source module, a control module, or a first power module. The lower cavity electromagnetic shielding box is equipped with a Ka-band active local oscillator source module, a Ka-band active main oscillator source module, or a second power module. The first power module is used to power the various modules in the upper cavity, and the second power module is used to power the various modules in the lower cavity.

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