A C-band multi-channel broadband multi-mode transceiver

Abstract

The present application provides a C-band multi-channel broadband multi-mode transceiver, which includes a receiving channel unit, a transmitting channel unit, a configurable frequency source unit, a mode switching unit, a power conversion unit, and a digital control unit; the receiving channel unit includes a numerically controlled amplitude stabilization component, a switch self-check component, a receiving frequency conversion component, a mode switching component, and an ADC; the transmitting channel unit includes a DAC, an up-conversion component, and a self-check and standing wave detection component; the configurable frequency source unit includes 4 fast-hopping local oscillators and 2 fixed local oscillators, and one of the fast-hopping local oscillators is power-divided into two paths to provide a hopping local oscillator for one path of the receiving channel unit and the transmitting channel unit. Through the digital control unit, the frequency and hopping mode of the frequency source unit are configured; the mode switching unit includes an amplification component, an AGC component, and a bandwidth-adjustable filtering component, and the output is sent to the ADC.

Description

Technical Field

[0001] The present invention belongs to the radio frequency field of communication systems, and particularly relates to a C-band multi-channel broadband multi-mode transceiver. Background Art

[0002] The uniqueness of each waveform system has determined the need for an independent transceiver for a long time. With the trend of integration development, in the future, it will tend to use unified hardware resources to implement all the above functions. Therefore, the demand for multi-channel broadband multi-mode transceivers is becoming stronger and stronger.

[0003] The multi-channel broadband multi-mode transceiver can perform unified intermediate-frequency digital signal processing on the received and transmitted signals of each frequency band through mode configuration. However, there are inevitably a series of technical difficulties in the integrated multi-channel broadband transceiver, such as signal interference problems within a wide frequency band, broadband noise blocking problems, strong signal suppression of weak signals, signal interference between multiple channels, crosstalk between received and transmitted signals, etc. There are also requirements for anti-degradation environments and high reliability in complex electromagnetic environments. Summary of the Invention

[0004] The present invention provides a C-band multi-channel broadband multi-mode transceiver, which can solve the problems of signal interference within a wide frequency band, broadband noise blocking problems, and strong signal suppression of weak signals of the C-band multi-channel broadband wide-mode transceiver.

[0005] Technical Solution: A C-band multi-channel broadband multi-mode transceiver, the transceiver includes a receiving channel unit, a transmitting channel unit, a configurable frequency source unit, a mode switching unit, a power conversion unit, and a digital control unit; the receiving channel unit includes a numerically controlled amplitude stabilization component, a switch self-checking component, a receiving frequency conversion component, a mode switching component, and an ADC; the transmitting channel unit includes a DAC, an up-conversion component, and a self-checking and standing wave detection component; the configurable frequency source unit includes 4 fast-hopping local oscillators and 2 fixed local oscillators, and one of the fast-hopping local oscillators is power-divided into two paths to provide a hopping local oscillator for one path of the receiving channel unit and the transmitting channel unit. Through the digital control unit, the frequency and hopping mode of the frequency source unit are configured; the mode switching unit includes an amplification component, an AGC component, and a bandwidth-adjustable filtering component, and then outputs and sends it into the ADC; the power conversion unit includes a power conversion module, which converts the input voltage into the power types required by each circuit in the module; the digital control unit includes a digital control module based on FPGA, where:

[0006] Four receiving RFin1-4 signals enter the numerically controlled amplitude stabilization component of the receiving channel unit; the processed four radio frequency signals enter the switch self-checking component, and then the four radio frequency signals enter the receiving frequency conversion component, are converted into four 140M intermediate frequency signals and enter the mode switching component, and finally enter the ADC to complete analog-to-digital conversion into baseband signals and enter the digital control unit and output from the interface circuit;

[0007] The transmitted signal enters the digital control unit through the interface circuit, and is converted from the digital baseband signal to a 140M RF signal by the DAC. Subsequently, it enters the up-conversion module, where transmission self-check and standing wave detection are performed, and the RF signal RFout1 is output.

[0008] In the configurable frequency source unit, the external reference is divided into multiple paths for the fast-hopping local oscillator and the fixed local oscillator; three paths of the fast-hopping local oscillator directly enter the receive frequency conversion module, and one path is divided into two paths and enters the receive frequency conversion and up-conversion modules respectively; there are two paths for the fixed local oscillator, one enters the receive frequency conversion module and the other enters the up-conversion module; the control signal of the configurable frequency source unit is input from the digital control unit.

[0009] Specifically, the control signal and the RF signal are respectively connected to the input end of the STC digital control attenuator. The output end of the STC digital control attenuator is successively connected to the LNA amplifier, the BPF filter, the switch self-check circuit, the mixer, the filter, the first intermediate frequency amplifier, the mixer, the filter, the mode switching module, the filter, and the ADC, and the baseband signal is output.

[0010] Specifically, the digital baseband signal is connected to the input end of the DAC. The output end of the DAC outputs a 140M intermediate frequency signal, which then successively enters the filter, the mixer, the filter, the amplifier, the filter, the mixer, the filter, the amplifier, and the filter, and then the RF signal is output.

[0011] Specifically, the intermediate frequency signal of the mode switching unit undergoes digital control attenuation and power amplification to obtain a stable output power. Channel detection is performed on the output power, and the attenuation value of the digital control attenuation is controlled by the feedback control signal through the control circuit to perform amplitude stability control on the output power.

[0012] Specifically, the fast-hopping local oscillator of the configurable frequency source unit is adjustable in the frequency range of 3150MHz to 7150MHz, and the fast frequency switching can be achieved by combining PLL and DDS.

[0013] Specifically, the fixed frequency source of 710MHz is simulated and synthesized by using the phase-locked loop method. Its output end is fed into one input end of the fractional-N frequency discriminator and phase detector, and is compared with the frequency obtained after dividing the reference frequency input from the other port;

[0014] The loop filter at the output end of the frequency discriminator and phase detector suppresses the phase discrimination frequency component. This filter also serves as an integrator, and the DC control voltage at the output end of the loop filter adjusts the frequency of the VCO until the divided frequency and phase are equal to those of the phase discrimination frequency.

[0015] Specifically, the four self-check signals of the switch self-check module are input from the self-check source of the switch self-check module.

[0016] Specifically, the numerically controlled amplitude stabilization component includes an STC numerically controlled attenuator, an LNA amplifier, and a BPF filter.

[0017] In summary, the present invention provides a C-band multi-channel broadband multi-mode transceiver. Through the control method of system software instructions, multi-mode configuration is achieved, corresponding mode channels are switched, thereby adjusting the performance indicators of the module, completing the reconstruction for adapting to different waveforms, and solving the problem of waveform reconstruction on the same module. The combination of PLL and DDS is used to achieve fast frequency hopping switching, enabling the module to support the dwell of waveforms with fast hopping capabilities. The reception and transmission of wideband RF signals in the 4 GHz - 8 GHz frequency band in the C-band are realized, which can meet various applications in the C-band. Description of the Drawings

[0018] Figure 1 It is a principle block diagram of a C-band multi-channel broadband multi-mode transceiver provided by this application;

[0019] Figure 2 It is a principle block diagram of a receiving channel unit provided by this application;

[0020] Figure 3 It is a principle block diagram of a transmitting channel unit provided by this application;

[0021] Figure 4 It is a block diagram of a mode switching unit provided by this application;

[0022] Figure 5 It is a principle block diagram of a configurable frequency source unit provided by this application. Specific Implementation Method

[0023] To meet the requirements of the sustainable development of current communication systems, through in-depth research on communication equipment, soft radio architecture, and related software and hardware platform standards, the integration, generalization, standardization, modularization, and multi-mode configuration of RF channels are achieved, meeting the requirements of capabilities and expansion. At the same time, the volume, weight, power consumption, and cost of the RF integrated system are reduced, and the mission reliability is improved, etc.

[0024] For this RF module, through multi-mode configuration, it can flexibly adapt to various communication waveforms and can be applied to C-band integrated communication devices, integrated communication navigation and identification systems, software radio systems, and integrated RF systems of various wireless communication platforms.

[0025] It relates to the design architecture of a C-band multi-channel broadband multi-mode transceiver, specifically to a C-band multi-channel broadband multi-mode transceiver technology based on superheterodyne and RFDAC architectures, which is mode-configurable and broadband, and is applied to the field of general RF transceivers that can be adaptive according to functional software.

[0026] The principle of the C-band multi-channel broadband multi-mode transceiver is to achieve multi-mode configuration through the control of system software instructions, switch the corresponding mode channels, thereby adjusting the performance indicators of the module, and completing the reconstruction to adapt to different waveforms. In the receiver part, the form of double local oscillator frequency conversion is adopted, the intermediate frequency is 140M, the intermediate frequency bandwidth is configurable, and after the signal is processed by the amplification filter and AGC circuit, it is converted into a digital baseband signal by the ADC and output; in the transmitter part, it includes a DAC and an up-conversion circuit, and also adopts double local oscillator frequency conversion to finally output the radio frequency signal. In addition, a configurable frequency source unit is built into the transceiver, including 4 fast-hopping local oscillators and 2 fixed local oscillators, which provide hopping local oscillators and fixed local oscillators for the receiving and transmitting circuits.

[0027] This application provides a C-band multi-channel broadband multi-mode transceiver, which realizes configurable broadband frequency range and different mode signal bandwidth modules, and solves the problems of the same source of multi-channel broadband received signals, fast frequency switching of the transmitting channel, and the contradiction of fast multi-mode adaptation.

[0028] It should be noted that a C-band multi-channel broadband multi-mode transceiver adopts a receiving and transmitting link architecture based on double frequency conversion and a method of configurable transceiver channel modes. The radio frequency receiving end of the receiving channel unit is connected to a numerically controlled amplitude-stabilized component for power adjustment and signal self-check, and then is down-converted into an intermediate frequency signal by the receiving frequency conversion component. The local oscillator source is provided by the configurable frequency source unit, and the intermediate frequency signal passes through the mode switching component and the ADC to become the baseband digital signal to be processed by the waveform. After the digital baseband signal is converted into an intermediate frequency signal by the DAC in the transmitting channel unit, it becomes an outputtable radio frequency signal through the up-conversion component, and passes through the transmitting self-check component before output.

[0029] It should be noted that compared with the traditional transceiver in the C-band, the present invention has the following three main technical innovation points: the received signal bandwidth of the transceiver can be quickly switched and configured according to the waveform requirements. By selecting a suitable combination of amplifiers and intermediate frequency filters in the mode switching component, dynamic reconstruction within the broadband range of the transceiver can be achieved; the technology of realizing fast frequency hopping switching by combining PLL and DDS. By combining the two methods of realizing frequency synthesis, the problems existing in each are effectively solved, so as to achieve fast frequency conversion and high spurious suppression; multi-channel high isolation technology. The transceiver includes four receiving channels, one transmitting channel and multiple local oscillator signals. Through structural planning and isolation design in the circuit, the signal crosstalk between multiple channels is properly solved.

[0030] Such as Figure 1As shown in the figure, the present application provides a C-band multi-channel broadband multi-mode transceiver, which includes a receiving channel unit, a transmitting channel unit, a configurable frequency source unit, a mode switching unit, a power conversion unit, and a digital control unit; the receiving channel unit includes a numerically controlled amplitude stabilization component, a switch self-check component, a receiving frequency conversion component, a mode switching component, and an ADC; the transmitting channel unit includes a DAC, an up-conversion component, and a self-check and standing wave detection component; the configurable frequency source unit includes 4 fast-hopping local oscillators and 2 fixed local oscillators, and one of the fast-hopping local oscillators is divided into two paths to provide a hopping local oscillator for one path of the receiving channel unit and the transmitting channel unit. Through the digital control unit, the frequency and hopping mode of the frequency source unit are configured; the mode switching unit includes an amplification component, an AGC component, and a bandwidth adjustable filtering component, and the output is sent to the ADC; the power conversion unit includes a power conversion module that converts the input voltage into the power types required by each circuit in the module; the digital control unit includes a digital control module based on FPGA, where:

[0031] The four-channel received RFin1-4 signals enter the numerically controlled amplitude stabilization component of the receiving channel unit. The processed four-channel radio frequency signals enter the switch self-check component, and then the four-channel radio frequency signals enter the receiving frequency conversion component, are converted into four-channel 140M intermediate frequency signals and enter the mode switching component, and finally enter the ADC to complete the analog-to-digital conversion into baseband signals and enter the digital control unit and output from the interface circuit;

[0032] The transmitted signal enters the digital control unit from the interface circuit, and the DAC converts the digital baseband signal into a 140M radio frequency signal, then enters the up-conversion component, and performs transmission self-check and standing wave detection (one self-check signal is input by power division from the switch self-check component of the receiving channel), and completes the output of the radio frequency signal RFout1;

[0033] In the configurable frequency source unit, the external reference is divided into multiple paths to the fast-hopping local oscillator and the fixed local oscillator; three paths of the fast-hopping local oscillator directly enter the receiving frequency conversion component, and one path is divided into two paths and enters the receiving frequency conversion and up-conversion components respectively; two paths of the fixed local oscillator, one path enters the receiving frequency conversion component, and one path enters the up-conversion component; the control signal of the configurable frequency source unit is input from the digital control unit.

[0034] Specifically, the numerically controlled amplitude stabilization component includes an STC numerically controlled attenuator, an LNA amplifier, and a BPF filter.

[0035] Specifically, the four self-check signals of the switch self-check component are input from the self-check source of the switch self-check component.

[0036] Such as Figure 2As shown in the figure, the control signal and the radio frequency signal are respectively connected to the input end of the STC digital controlled attenuator. The output end of the STC digital controlled attenuator is successively connected to the LNA amplifier, the BPF filter, the switch self-checking circuit, the mixer, the filter, the first intermediate frequency amplifier, the mixer, the filter, the mode switching component, the filter, and the ADC to output the baseband signal.

[0037] Specifically, after the radio frequency signal received by the receiving channel unit is digitally controlled attenuated, amplified, and then filtered, channel self-checking is first performed, and then it is mixed with the fast-hopping local oscillator signal to the first intermediate frequency of 850 MHz. The first intermediate frequency is amplified and filtered and then mixed with the fixed local oscillator of 710 MHz to obtain an intermediate frequency of 140 MHz. Then, after being amplified, filtered, and processed by the AGC circuit, the output is sent to the mode switching component. According to the different functions of the dwell waveform, appropriate amplifiers and intermediate frequency filter banks are selected, and finally the output signal is sent to the ADC to be converted into a baseband digital signal.

[0038] As Figure 3 shown in the figure, the digital baseband signal is connected to the input end of the DAC. The output end of the DAC outputs a 140M intermediate frequency signal, which then successively enters the filter, the mixer, the filter, the amplifier, the filter, the mixer, the filter, the amplifier, and the filter, and then outputs the radio frequency signal.

[0039] The transmitted signal of the transmitting channel unit is converted from the baseband digital signal to a 140 MHz intermediate frequency signal by the DAC, and then input into the up-conversion component. In the conversion component, it is first filtered and then mixed with the local oscillator signal of 710 MHz to obtain an intermediate frequency signal of 850 MHz. This intermediate frequency signal is amplified and filtered and then mixed with the fast-hopping local oscillator signal. Finally, after being filtered and amplified, the final 4 GHz - 8 GHz wideband radio frequency transmitted signal is output, and the self-checking of the transmitted signal is performed.

[0040] As Figure 4 shown in the figure, the intermediate frequency signal of the mode switching unit is digitally controlled attenuated and power amplified to obtain a stable output power. The output power is channel detected, and the attenuation value of the digital controlled attenuator is controlled by the feedback control signal of the control circuit to perform amplitude stability control on the output power. For different dwell waveforms, appropriate amplifier types are selected, and then after passing through the bandwidth adjustable filter component, the bandwidth modulation of the output intermediate frequency signal is completed; finally, the output signal is sent to the ADC to be converted into a baseband digital signal.

[0041] As Figure 5As shown, the fast-hopping local oscillator of the configurable frequency source unit is adjustable in the frequency range of 3150 MHz to 7150 MHz, and the fast frequency switching can be achieved by combining PLL and DDS. The fixed frequency source of 710 MHz is simulated and synthesized by using the phase-locked loop method. Its output is fed into one input terminal of the fractional-N frequency discriminator and phase detector, and is compared with the frequency obtained after dividing the reference frequency input from the other port. The loop filter at the output terminal of the frequency discriminator and phase detector suppresses the phase discrimination frequency component. This filter also serves as an integrator. The DC control voltage at the output terminal of the loop filter adjusts the frequency of the VCO until the frequency and phase obtained after frequency division are equal to those of the phase discrimination frequency.

[0042] The above embodiments are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and equivalent replacements can be made. These technical solutions obtained by improving and equivalent replacing the claims of the present invention all fall within the protection scope of the present invention.

Claims

1. A C-band multi-channel broadband multi-mode transceiver, characterized in that, The transceiver includes a receiving channel unit, a transmitting channel unit, a configurable frequency source unit, a mode switching unit, a power conversion unit, and a digital control unit; the receiving channel unit includes a numerically controlled amplitude stabilization component, a switch self-check component, a receiving frequency conversion component, a mode switching component, and an ADC; the transmitting channel unit includes a DAC, an up-conversion component, and a self-check and standing wave detection component; the configurable frequency source unit includes 4 fast-hopping local oscillators and 2 fixed local oscillators, where one fast-hopping local oscillator is split into two paths to provide a hopping local oscillator for one path of the receiving channel unit and the transmitting channel unit. Through the digital control unit, the frequency and hopping mode of the frequency source unit are configured; the mode switching unit includes an amplification component, an AGC component, and a bandwidth adjustable filtering component, and the output is sent to the ADC; the power conversion unit includes a power conversion module that converts the input voltage into the power types required by each circuit in the module. The digital control unit includes a digital control module based on FPGA, where: Four receiving RFin1-4 signals enter the numerically controlled amplitude stabilization component of the receiving channel unit; the processed four RF signals enter the switch self-check component, and then the four RF signals enter the receiving frequency conversion component, are converted into four 140M intermediate frequency signals and enter the mode switching component, and finally enter the ADC to complete the analog-to-digital conversion into a baseband signal and enter the digital control unit and output from the interface circuit. The transmitted signal enters the digital control unit from the interface circuit, and the DAC converts it from the digital baseband signal into a 140M RF signal, then enters the up-conversion component, and performs transmission self-check and standing wave detection to complete the output of the RF signal RFout1; after the digital baseband signal in the transmitting channel unit is converted into an intermediate frequency signal by the DAC, it becomes an outputtable RF signal after passing through the up-conversion component, and passes through the transmission self-check component before output. In the configurable frequency source unit, the external reference is split into multiple paths to the fast-hopping local oscillators and the fixed local oscillators; three paths of the fast-hopping local oscillators directly enter the receiving frequency conversion component, and one path is split into two paths to enter the receiving frequency conversion and the up-conversion component respectively; two paths of the fixed local oscillators, one enters the receiving frequency conversion component, and one enters the up-conversion component; the control signal of the configurable frequency source unit is input from the digital control unit.

2. The C-band multi-channel broadband multi-mode transceiver according to claim 1, wherein The control signal and the RF signal are respectively connected to the input end of the STC numerically controlled attenuator, and the output end of the STC numerically controlled attenuator is successively connected to the LNA amplifier, the BPF filter, the switch self-check circuit, the mixer, the filter, the first intermediate frequency amplifier, the mixer, the filter, the mode switching component, the filter, and the ADC to output the baseband signal.

3. The C-band multi-channel broadband multi-mode transceiver according to claim 1, characterized in that, The digital baseband signal is connected to the input end of the DAC, and the output end of the DAC outputs a 140M intermediate frequency signal, which then successively enters the filter, the mixer, the filter, the amplifier, the filter, the mixer, the filter, the amplifier, and the filter, and then outputs the RF signal.

4. The C-band multi-channel broadband multi-mode transceiver according to claim 1, characterized in that The intermediate frequency signal of the mode switching unit obtains a stable output power after numerical control attenuation and power amplification, performs channel detection on the output power, controls the attenuation value of the numerical control attenuation through the feedback control signal of the control circuit, and performs amplitude stabilization control on the output power.

5. The C-band multi-channel broadband multi-mode transceiver according to claim 1, characterized in that The fast-hopping local oscillator of the configurable frequency source unit is adjustable in the frequency range of 3150 MHz to 7150 MHz, and the fast frequency switching can be achieved by combining PLL and DDS.

6. The C-band multi-channel broadband multi-mode transceiver according to claim 5, wherein The 710 MHz fixed frequency source is simulated and synthesized by means of a phase-locked loop. Its output is fed into one input of the fractional-N frequency discriminator and phase detector, and compared with the frequency obtained after dividing the reference frequency input at the other port. The loop filter at the output of the frequency discriminator and phase detector suppresses the phase discrimination frequency component. This filter also serves as an integrator, and the DC control voltage at the output of the loop filter adjusts the frequency of the VCO until the frequency and phase obtained after frequency division are equal to those of the phase discrimination frequency.

7. The C-band multi-channel broadband multi-mode transceiver according to claim 1, wherein The four self-test signals of the switch self-test component are input from the self-test source of the switch self-test component.

8. The C-band multi-channel broadband multi-mode transceiver according to claim 1, characterized in that, The numerically controlled amplitude stabilization component includes an STC numerically controlled attenuator, an LNA amplifier, and a BPF filter.

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