Radar radiation source simulator based on bidirectional microwave link

Abstract

The invention discloses a radar radiation source simulator based on a bidirectional microwave link, belongs to the technical field of radar target simulation, and solves the problem of high structural complexity of an existing radar radiation source simulator. The simulator comprises an antenna, a radio frequency transceiving assembly, a radar simulation assembly and a power amplifier, the antenna transmits a received radio frequency input signal to the radio frequency transceiving assembly; the radio frequency transmit-receive assembly performs down-conversion regulation and control on a radio frequency input signal to obtain an intermediate frequency output signal and a radio frequency detection result; the radar simulation assembly generates a multi-target radar simulation intermediate frequency signal according to the intermediate frequency output signal and the radio frequency detection result; the radio frequency transceiving assembly performs up-conversion regulation and control on the multi-target radar simulation intermediate frequency signal to obtain a radar simulation radio frequency output signal; the power amplifier performs power amplification on the radar simulation radio frequency output signal and then transmits the signal through the antenna; and a bidirectional microwave link is arranged in the radio frequency transceiving component and is used for realizing time-sharing regulation and control between up-conversion regulation and control and down-conversion regulation and control.

Description

Technical Field

[0001] The present invention relates to the technical field of radar target simulation, and in particular, to a radar radiation source simulator based on a bidirectional microwave link. Background Art

[0002] In the military field, the future intelligent combat requirements of weaponry will rely more on highly integrated electronic information systems. The development of new-generation radar, communication, electronic warfare and other advanced weaponry urgently demands the integration of radio frequency microsystems. The integration of radio frequency microsystems can achieve highly integrated functional modules or subsystems based on new concepts and new processes at the micro-nano scale, and then macroscopically achieve significant reduction in the volume and power consumption of weaponry, significant improvement in performance and reliability, significant reduction in channel cost and full-life cycle cost, support for multiple functions and gradually possess intelligence and other characteristics. Electronic countermeasure has become an important factor determining the outcome of modern high-tech wars and an important means to weaken the superior forces of the enemy. Electronic countermeasure equipment has penetrated into all aspects of the military field and plays a decisive role in the combat effectiveness of weapon platforms. Therefore, the struggle between the two sides of the war for the control of the electromagnetic spectrum has become increasingly fierce. Electronic countermeasure has become the "soul" dominating the battlefield and the core content of modern wars, playing a decisive role in wars. The forms of electronic countermeasure include air-to-air, ground-to-air, air-to-ground, etc. In recent years, there have been more and more confrontations between unmanned aerial vehicles. The platforms participating in electronic countermeasure are diverse. The wide bandwidth, miniaturization, and high integration of microwave systems are an inevitable trend to adapt to various combat platforms.

[0003] In the process of simulating high-frequency radar signals, it is impossible to directly simulate the received radio frequency signals. It is necessary to down-convert them to intermediate frequency signals before performing signal simulation, and then up-convert them to radio frequency signals before transmitting. In common radio frequency transceiver modules, the receiving channel and the transmitting channel are independent of each other, resulting in high complexity and cost in the design of radio frequency transceiver hardware, thus making the structure of the radar radiation source simulator constituted thereby complex and poor in portability. Therefore, how to optimize the structure of the radar radiation source simulator has become a technical problem that urgently needs to be solved at present. Summary of the Invention

[0004] In view of the above analysis, the embodiments of the present invention aim to provide a radar radiation source simulator based on a bidirectional microwave link to solve the problem of high structural complexity of existing radar radiation source simulators.

[0005] The present invention discloses a radar radiation source simulator based on a bidirectional microwave link. The simulator includes: an antenna, a radio frequency transceiver module, a radar simulation module, and a power amplifier; wherein,

[0006] The antenna transmits the received RF input signal to the RF transceiver module; the RF transceiver module performs down-conversion regulation on the RF input signal to obtain an intermediate-frequency output signal and an RF detection result;

[0007] The radar simulation module receives and processes the intermediate-frequency output signal and the RF detection result, and generates a multi-target radar simulation intermediate-frequency signal;

[0008] The RF transceiver module performs up-conversion regulation on the multi-target radar simulation intermediate-frequency signal to obtain a radar simulation RF output signal; after the power amplifier amplifies the power of the radar simulation RF output signal, it is transmitted through the antenna.

[0009] Among them, the RF transceiver module has a built-in bidirectional microwave link for implementing time-sharing regulation between up-conversion regulation and down-conversion regulation.

[0010] On the basis of the above solution, the present invention has also made the following improvements:

[0011] Further, the radar simulation module includes a modulation parameter determination module, a false target modulation module, and a superposition module; among them,

[0012] The modulation parameter determination module is used to generate multiple groups of matching false target modulation parameters according to the RF detection result;

[0013] The false target modulation module modulates the intermediate-frequency output signal according to each group of false target modulation parameters respectively to obtain corresponding radar modulation signals;

[0014] The superposition module is used to superpose all the radar modulation signals to obtain a multi-target radar simulation intermediate-frequency signal; the superposition module directly sends the multi-target radar simulation intermediate-frequency signal to the RF transceiver module.

[0015] Further, the false target modulation parameters include delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters.

[0016] Further, in the modulation parameter determination module, the delay, Doppler, and amplitude are determined according to the RF detection result; and based on the delay, Doppler, and amplitude, several delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters are designed, and multiple groups of false target modulation parameters are combined.

[0017] Further, the RF transceiver module further includes: an RF input channel, an intermediate-frequency output channel, an intermediate-frequency input channel, an RF output channel, and a bidirectional microwave link; among them,

[0018] The input end of the RF input channel is used to receive RF input signals. The output end of the RF input channel is connected to the up-conversion control input end of the bidirectional microwave link. The up-conversion control output end of the bidirectional microwave link is connected to the input end of the intermediate-frequency output channel. The output end of the intermediate-frequency output channel is used to output intermediate-frequency output signals;

[0019] The input end of the intermediate-frequency input channel is used to receive multi-target radar analog intermediate-frequency signals. The output end of the intermediate-frequency input channel is connected to the down-conversion control input end of the bidirectional microwave link. The down-conversion control output end of the bidirectional microwave link is connected to the input end of the RF output channel. The output end of the RF output channel is used to transmit radar analog RF output signals;

[0020] For the said bidirectional microwave link, when the RF transmitting component is used to receive RF input signals, the up-conversion control link is enabled; when the RF transmitting component is used to transmit radar analog RF output signals, the down-conversion control link is enabled.

[0021] Furthermore, the bidirectional microwave link includes a first single-pole double-throw switch, a 2 - 18G multiplex filter, a double-balanced mixer, a K-band band-pass filter, a bidirectional amplifier, and a second single-pole double-throw switch; wherein,

[0022] The first moving terminal and the second moving terminal of the first single-pole double-throw switch are respectively used as the up-conversion control input end and the down-conversion control output end; the fixed terminal of the first single-pole double-throw switch is connected to one end of the 2 - 18G multiplex filter. The other end of the 2 - 18G multiplex filter is connected to the intermediate-frequency terminal IF of the double-balanced mixer. The radio-frequency terminal RF of the double-balanced mixer is connected to one end of the K-band band-pass filter. The local oscillator terminal LO of the double-balanced mixer receives the first broadband local oscillator signal;

[0023] The other end of the K-band band-pass filter is connected to one end of the bidirectional amplifier. The other end of the bidirectional amplifier is connected to the fixed terminal of the second single-pole double-throw switch. The first moving terminal and the second moving terminal of the second single-pole double-throw switch are respectively used as the up-conversion control output end and the down-conversion control input end.

[0024] Furthermore, the RF transmitting component further includes a microwave link control module;

[0025] For the said microwave link control module, when the RF transmitting component is used to receive RF input signals, an up-conversion control instruction is sent to the bidirectional microwave link; based on the received up-conversion control instruction, the bidirectional microwave link controls the connection between the first moving terminal and the fixed terminal of the first single-pole double-throw switch, and the connection between the first moving terminal and the fixed terminal of the second single-pole double-throw switch, so as to enable the up-conversion control link;

[0026] When the RF transmitting component is used to transmit the multi-target radar analog intermediate frequency signal, the microwave link control module also sends a down-conversion control instruction to the bidirectional microwave link; based on the received down-conversion control instruction, the bidirectional microwave link controls the second moving end and the fixed end of the first single-pole double-throw switch to be connected, and the second moving end and the fixed end of the second single-pole double-throw switch to be connected to enable the down-conversion control link.

[0027] Further, the intermediate frequency output channel includes a second mixer, a first S / C band band-pass filter, a coupler, a third mixer, a pulse detector, and an L-band filter amplifier; wherein,

[0028] The RF terminal RF of the second mixer serves as the input terminal of the intermediate frequency output channel. The intermediate frequency terminal IF of the second mixer is connected to the input terminal of the first S / C band band-pass filter. The output terminal of the first S / C band band-pass filter is connected to the input terminal of the coupler. The through terminal of the coupler is connected to the RF terminal RF of the third mixer. The intermediate frequency terminal IF of the third mixer is connected to the input terminal of the L-band filter amplifier. The output terminal of the L-band filter amplifier serves as the output terminal of the intermediate frequency output channel;

[0029] The local oscillator terminal LO of the second mixer is used to receive the second fixed local oscillator signal; the local oscillator terminal LO of the third mixer is used to receive the third fixed local oscillator signal;

[0030] The coupled terminal of the coupler is connected to the input terminal of the pulse detector, and the output terminal of the pulse detector is used to output the detection result.

[0031] Further, the intermediate frequency input channel includes a fourth mixer, a second S / C band band-pass filter, an S / C band amplifier, and a fifth mixer; wherein,

[0032] The intermediate frequency terminal IF of the fourth mixer serves as the input terminal of the intermediate frequency input channel. The RF terminal RF of the fourth mixer is connected to the input terminal of the second S / C band band-pass filter. The output terminal of the second S / C band band-pass filter is connected to the input terminal of the S / C band amplifier. The output terminal of the S / C band amplifier is connected to the intermediate frequency terminal IF of the fifth mixer. The RF terminal RF of the fifth mixer serves as the output terminal of the intermediate frequency input channel;

[0033] The local oscillator terminal LO of the fifth mixer is used to receive the second fixed local oscillator signal; the local oscillator terminal LO of the fourth mixer is used to receive the third fixed local oscillator signal.

[0034] Further, the RF output channel includes a 2-18G saturated amplifier and an electrically tunable attenuator; wherein, the input terminal of the 2-18G saturated amplifier serves as the input terminal of the RF output channel. The output terminal of the 2-18G saturated amplifier is connected to the input terminal of the electrically tunable attenuator. The output terminal of the electrically tunable attenuator serves as the output terminal of the RF output channel.

[0035] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0036] The radar radiation source simulator based on a bidirectional microwave link provided by the present invention simplifies the structure of the radar radiation source simulator constructed thereby by designing a bidirectional microwave link in the radio frequency transmitting component, and can meet the design requirements of miniaturization and portability. The radio frequency transmitting component includes a receiving channel and a transmitting channel. The receiving and transmitting channels share the bidirectional microwave link. The bidirectional microwave link can realize the bidirectional regulation of the microwave link through the bidirectional control of a set of links, reducing the volume, thereby meeting the miniaturization requirements of the radio frequency transmitting component. At the same time, the design complexity and design cost of the hardware are reduced, and the problem of multi-band integrated broadband transceiver design is effectively solved.

[0037] At the same time, through the specific settings of the radio frequency input channel, intermediate frequency output channel, intermediate frequency input channel, radio frequency output channel and bidirectional microwave link, the radio frequency transmitting component can meet multiple technical indicators such as receiving sensitivity, receiving power dynamic range, output power range and instantaneous bandwidth. The device reduces the number of components and distributes the components reasonably, so that the assembled structure has a small volume and can meet the miniaturization requirements.

[0038] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages will be obvious from the specification or can be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals represent the same components;

[0040] Figure 1 is the radar radiation source simulator based on a bidirectional microwave link provided by an embodiment of the present invention;

[0041] Figure 2 is a schematic structural diagram of a radio frequency transceiver component provided by an embodiment of the present invention;

[0042] Figure 3 is the specific circuit diagram of the radio frequency transceiver component provided by an embodiment of the present invention;

[0043] Figure 4 is the intermediate frequency mixing principle diagram provided by an embodiment of the present invention;

[0044] Figure 5 is the radio frequency mixing principle diagram provided by an embodiment of the present invention. Detailed implementation manners

[0045] The following will specifically describe the preferred embodiments of the present invention with reference to the accompanying drawings. The accompanying 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.

[0046] A specific embodiment of the present invention discloses a radar radiation source simulator based on a bidirectional microwave link. The structural schematic diagram is as Figure 1 shown. The simulator includes: an antenna, a radio frequency transceiver component, a radar simulation component, and a power amplifier. Among them, the antenna transmits the received radio frequency input signal to the radio frequency transceiver component; the radio frequency transceiver component performs down-conversion regulation on the radio frequency input signal to obtain an intermediate frequency output signal and a radio frequency detection result; the radar simulation component receives and processes the intermediate frequency output signal and the radio frequency detection result to generate a multi-target radar simulation intermediate frequency signal; the radio frequency transceiver component performs up-conversion regulation on the multi-target radar simulation intermediate frequency signal to obtain a radar simulation radio frequency output signal; the power amplifier amplifies the power of the radar simulation radio frequency output signal and then transmits it through the antenna. Among them, the radio frequency transceiver component is internally provided with a bidirectional microwave link for realizing time-sharing regulation between up-conversion regulation and down-conversion regulation.

[0047] Preferably, in this embodiment, the radar simulation component includes a modulation parameter determination module, a false target modulation module, and a superposition module. Among them, the modulation parameter determination module is used to generate a matching set of false target modulation parameters according to the radio frequency detection result; the false target modulation module modulates the intermediate frequency output signal according to each set of false target modulation parameters to obtain corresponding radar modulation signals; the superposition module is used to superpose all the radar modulation signals to obtain a multi-target radar simulation intermediate frequency signal; the superposition module directly sends the multi-target radar simulation intermediate frequency signal to the radio frequency transceiver component.

[0048] Preferably, the false target modulation parameters include delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters. In the modulation parameter determination module, the delay, Doppler, and amplitude are determined according to the radio frequency detection result; and based on the delay, Doppler, and amplitude, a number of delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters are designed, and a set of false target modulation parameters is obtained by combination.

[0049] It should be noted that in this embodiment, the miniaturization of the radar radiation source simulator based on the bidirectional microwave link is mainly achieved by the bidirectional microwave link in the radio frequency transceiver component. Next, the specific circuit of the radio frequency transceiver component with a bidirectional microwave link used in this embodiment is introduced as follows.

[0050] The structural schematic diagram of the radio frequency transceiver component provided in this embodiment is as Figure 2 shown, and the specific circuit diagram is asFigure 3 As shown. The device includes: a radio frequency input channel, an intermediate frequency output channel, an intermediate frequency input channel, a radio frequency output channel, and a bidirectional microwave link; wherein, the input end of the radio frequency input channel is used to receive a radio frequency input signal, the output end of the radio frequency input channel is connected to the up-conversion control input end of the bidirectional microwave link, the up-conversion control output end of the bidirectional microwave link is connected to the input end of the intermediate frequency output channel, and the output end of the intermediate frequency output channel is used to output an intermediate frequency output signal; the input end of the intermediate frequency input channel is used to receive a multi-target radar analog intermediate frequency signal, the output end of the intermediate frequency input channel is connected to the down-conversion control input end of the bidirectional microwave link, the down-conversion control output end of the bidirectional microwave link is connected to the input end of the radio frequency output channel, and the output end of the radio frequency output channel is used to transmit a radar analog radio frequency output signal; for the said bidirectional microwave link, when the device is used to receive a radio frequency input signal, the up-conversion control link is enabled; when the device is used to transmit a radar analog radio frequency output signal, the down-conversion control link is enabled.

[0051] Preferably, the bidirectional microwave link is implemented in the following manner: the bidirectional microwave link includes a first single-pole double-throw switch (SPDT1), a 2-18G multi-channel filter, a double-balanced mixer, a K-band band-pass filter, a bidirectional amplifier, and a second single-pole double-throw switch (SPDT2); wherein, the first moving terminal and the second moving terminal of the first single-pole double-throw switch are respectively used as the up-conversion control input end and the down-conversion control output end; the stationary terminal of the first single-pole double-throw switch is connected to one end of the 2-18G multi-channel filter, the other end of the 2-18G multi-channel filter is connected to the intermediate frequency terminal IF of the double-balanced mixer, the radio frequency terminal RF of the double-balanced mixer is connected to one end of the K-band band-pass filter, and the local oscillator terminal LO of the double-balanced mixer receives the first wide-band local oscillator signal LO1_in; the other end of the K-band band-pass filter is connected to one end of the bidirectional amplifier, the other end of the bidirectional amplifier is connected to the stationary terminal of the second single-pole double-throw switch, and the first moving terminal and the second moving terminal of the second single-pole double-throw switch are respectively used as the up-conversion control output end and the down-conversion control input end. In the bidirectional microwave link provided in this embodiment, by selecting a double-balanced mixer and a bidirectional amplifier, when the up-conversion control link is enabled, the double-balanced mixer can be used to perform up-conversion on the signal output by the radio frequency input channel, and the bidirectional amplifier can be used to amplify the signal after the up-conversion and filtering processes are completed. At the same time, when the down-conversion control link is enabled, the double-balanced mixer can be used to perform down-conversion on the signal output by the intermediate frequency input channel, and the bidirectional amplifier can be used to amplify the signal after the down-conversion and filtering processes are completed. Thus, the up-conversion and down-conversion adaptation of the same bidirectional microwave link in different states (receiving / transmitting) can be realized, and the amplification effect can be achieved in both directions. Exemplarily, the 2-18G multi-channel filter can be divided into 7 segments of filtering according to the signal frequency, and the overlapping bandwidth between the filtering ranges of each segment is 1GHz.

[0052] Preferably, to achieve control over the regulation direction of the bidirectional microwave link, the radio frequency (RF) transmitting assembly provided in this embodiment further includes a microwave link control module. When the RF transmitting assembly is used to receive an RF input signal, the microwave link control module sends an up-conversion regulation instruction to the bidirectional microwave link. Based on the received up-conversion regulation instruction, the bidirectional microwave link controls the connection between the first moving terminal and the fixed terminal of the first single-pole double-throw switch and the connection between the first moving terminal and the fixed terminal of the second single-pole double-throw switch to enable the up-conversion regulation link. When the RF transmitting assembly is used to transmit a radar analog RF output signal, the microwave link control module also sends a down-conversion regulation instruction to the bidirectional microwave link. Based on the received down-conversion regulation instruction, the bidirectional microwave link controls the connection between the second moving terminal and the fixed terminal of the first single-pole double-throw switch and the connection between the second moving terminal and the fixed terminal of the second single-pole double-throw switch to enable the down-conversion regulation link.

[0053] Preferably, the RF input channel includes a limiter, a numerically controlled attenuator, and a 2 - 18G linear amplifier. The input end of the limiter serves as the input end of the RF input channel. The output end of the limiter is connected to the input end of the numerically controlled attenuator. The output end of the numerically controlled attenuator is connected to the input end of the 2 - 18G linear amplifier. The output end of the 2 - 18G linear amplifier serves as the output end of the RF input channel. The RF frequency range of the RF input signal is 2 - 18 GHz.

[0054] Preferably, the intermediate frequency (IF) output channel includes a second mixer, a first S / C band bandpass filter, a coupler, a third mixer, and an L band filter amplifier. The RF terminal RF of the second mixer serves as the input end of the IF output channel. The IF terminal IF of the second mixer is connected to the input end of the first S / C band bandpass filter. The output end of the first S / C band bandpass filter is connected to the input end of the coupler. The through end of the coupler is connected to the RF terminal RF of the third mixer. The IF terminal IF of the third mixer is connected to the input end of the L band filter amplifier. The output end of the L band filter amplifier serves as the output end of the IF output channel. The local oscillator (LO) terminal of the second mixer is used to receive the second fixed local oscillator signal LO2_in. The LO terminal of the third mixer is used to receive the third fixed local oscillator signal LO3_in.

[0055] Preferably, the IF output channel further includes a pulse detector. The coupled end of the coupler is connected to the input end of the pulse detector. The output end of the pulse detector is used to output a detection result. The pulse detector is used to detect whether a signal exists at the coupled end of the coupler. If it exists, the output detection result is that the RF transmitting assembly receives an RF input signal. Otherwise, the output detection result is that the RF transmitting assembly does not receive an RF input signal.

[0056] Preferably, the intermediate-frequency input channel includes a fourth mixer, a second S / C band pass filter, an S / C band amplifier, and a fifth mixer; wherein, the RF terminal and the IF terminal of the fourth mixer serve as the input end of the intermediate-frequency input channel, the IF terminal of the fourth mixer serves as the input end of the intermediate-frequency input channel, the RF terminal of the fourth mixer is connected to the input end of the second S / C band pass filter, the output end of the second S / C band pass filter is connected to the input end of the S / C band amplifier, the output end of the S / C band amplifier is connected to the IF terminal of the fifth mixer, and the RF terminal of the fifth mixer serves as the output end of the intermediate-frequency input channel; the LO terminal of the fifth mixer is used to receive the second fixed local oscillator signal; the LO terminal of the fourth mixer is used to receive the third fixed local oscillator signal.

[0057] The RF output channel includes a 2-18G saturation amplifier and an electrically tunable attenuator; wherein, the input end of the 2-18G saturation amplifier serves as the input end of the RF output channel, the output end of the 2-18G saturation amplifier is connected to the input end of the electrically tunable attenuator, and the output end of the electrically tunable attenuator serves as the output end of the RF output channel.

[0058] In addition, considering that both the intermediate-frequency input channel and the intermediate-frequency output channel use the second fixed local oscillator signal and the third fixed local oscillator signal, therefore, in this embodiment, the channels enabling the second fixed local oscillator signal and the third fixed local oscillator signal can also be determined in the following manner. Specifically, the RF transmitting component further includes a third single-pole double-throw switch (SPDT3) and a fourth single-pole double-throw switch (SPDT4); wherein, the stationary terminal of the third single-pole double-throw switch receives the second fixed local oscillator signal, the first moving terminal of the third single-pole double-throw switch is connected to the LO terminal of the second mixer, and the second moving terminal of the third single-pole double-throw switch is connected to the LO terminal of the fifth mixer; the stationary terminal of the fourth single-pole double-throw switch receives the third fixed local oscillator signal, the first moving terminal of the fourth single-pole double-throw switch is connected to the LO terminal of the third mixer, and the second moving terminal of the fourth single-pole double-throw switch is connected to the LO terminal of the fourth mixer; when the RF transmitting component is used to receive an RF input signal, the stationary terminal and the first moving terminal of the third single-pole double-throw switch are connected, and the stationary terminal and the first moving terminal of the fourth single-pole double-throw switch are connected; when the RF transmitting component is used to transmit a radar analog RF output signal, the stationary terminal and the second moving terminal of the third single-pole double-throw switch are connected, and the stationary terminal and the second moving terminal of the fourth single-pole double-throw switch are connected.

[0059] Further, the third single-pole double-throw switch and the fourth single-pole double-throw switch are controlled by the microwave link control module; when the radio frequency transmitting component is used to receive a radio frequency input signal, the microwave link issues a first switch action control instruction to control the fixed terminal and the first moving terminal of the third single-pole double-throw switch to be connected, and also controls the fixed terminal and the first moving terminal of the fourth single-pole double-throw switch to be connected; when the radio frequency transmitting component is used to transmit a radar analog radio frequency output signal, the microwave link issues a second switch action control instruction to control the fixed terminal and the second moving terminal of the third single-pole double-throw switch to be connected, and also controls the fixed terminal and the second moving terminal of the fourth single-pole double-throw switch to be connected.

[0060] In the specific implementation process, the microwave link control module controls the radio frequency transmitting component to receive a radio frequency input signal or to transmit a radar analog radio frequency output signal in different time periods.

[0061] Based on the above description, it can be seen that the radar radiation source simulator based on a bidirectional microwave link provided in this embodiment can achieve the transceiver function with a frequency coverage of 2 GHz to 18 GHz, and realize the integrated broadband transceiver of the S / C / X / Ku bands. Next, taking Figure 3 as an example, the flow principle of the transceiver signals of the radio frequency transceiver component in the radar radiation source simulator based on a bidirectional microwave link is described as follows:

[0062] The implementation principle of the receiving function is described as follows: When the RF transmitting component is used to receive an RF input signal, the two-way microwave link enables the up-conversion control link, and the second mixer and the third mixer receive the second fixed local oscillator signal and the third fixed local oscillator signal respectively. At this time, after the RF input signal in the 2 GHz - 18 GHz broadband enters the RF input channel, it successively passes through a limiter, a digital controlled attenuator, and a 2 - 18G linear amplifier. Small signals are amplified step by step, and large signals are saturated and limited step by step. Thus, the limiting, attenuation, and amplification of the RF input signal are achieved by using the RF input channel. The output signal of the RF input channel is input to the two-way microwave link that enables the up-conversion control link. Harmonics are filtered out by a 2 - 18G multiplex filter, and it is mixed and up-converted with the first broadband local oscillator signal LO1_in (variable frequency) through a double-balanced mixer to generate a K-band signal; stray signals are filtered out by a K-band band-pass filter, and then the signal is amplified by a two-way amplifier, thereby obtaining the up-conversion output signal of the two-way microwave link. The up-conversion output signal of the two-way microwave link is input to the intermediate-frequency output channel, and it is mixed with the second fixed local oscillator signal LO2_in (fixed point frequency) through the second mixer to generate an S / C-band intermediate-frequency signal; after filtering and input to a coupler, one path is output for synchronous detection, and the other S / C-band intermediate-frequency signal is down-converted with the third fixed local oscillator signal LO3_in (fixed point frequency) to generate an intermediate-frequency signal in the range of 0.3 GHz - 2.3 GHz. After filtering and amplification by an L-band filter amplifier, the output end of the intermediate-frequency output channel is used to output the intermediate-frequency output signal.

[0063] The implementation principle of the transmitting function is described as follows: When the RF transmitting component is used to transmit a radar analog RF output signal, the two-way microwave link enables the down-conversion control link, and the fourth mixer and the fifth mixer receive the third fixed local oscillator signal and the second fixed local oscillator signal respectively. At this time, after the multi-target radar analog intermediate-frequency signal (interference intermediate-frequency signal) in the range of 0.3 GHz - 2.3 GHz enters the intermediate-frequency input channel, the fourth mixer is used to up-convert it with the third fixed local oscillator signal to generate an S / C-band intermediate-frequency signal. After filtering, saturation, and amplification by an S / C-band band-pass filter and an S / C-band amplifier, the fifth mixer is used to up-convert it with the second fixed local oscillator signal to generate a K-band signal. The K-band signal is input to the two-way microwave link that enables the down-conversion control link. The signal is amplified by a two-way amplifier and filtered by a K-band band-pass filter, and then it is down-converted with the first broadband local oscillator signal through a double-balanced mixer to generate an RF signal in the 2 GHz - 18 GHz broadband; this RF signal is filtered by a 2 - 18G multiplex filter to obtain the down-conversion output signal of the two-way microwave link. This down-conversion output signal is amplified and electronically tuned for attenuation by a 2 - 18G saturation amplifier and an electronically tuned attenuator in the RF output channel to obtain the radar analog RF output signal.

[0064] It should be emphasized that in the RF input channel of this embodiment, a digital controlled attenuator is adopted to improve the flexibility of signal gain control in the receiving channel, avoiding excessive saturation compression after high-power signals enter the RF input channel, which may affect the receiving performance of the RF transmitting component, and adjusting the receiving gain to ensure the receiving dynamic range of the component. Exemplarily, a three-state NC1325C-118PD digital controlled attenuator controlled by 2 bits can be used, which can achieve an attenuation step of 0 dB to 30 dB with a 10 dB step function, realizing the predetermined design indicators and effects. In the RF output channel, an electronically tunable attenuator (such as a combination of PIN attenuator + digital controlled attenuator) is selected to adjust the power of the output signal, ensuring that the radar analog RF output signal output from the RF output channel of the RF transmitting component can be amplitude-conditioned, so that the radar analog RF output signal reaches the required RF amplitude. Exemplarily, the implementation scheme for power control in the transmitting channel is as follows: Two devices from the 13th Research Institute of CETC, namely PIN attenuator BW870 and digital controlled attenuator BW150D, are used, which can achieve a power adjustable range of ≥40 dB within the full frequency band of 2 GHz to 18 GHz, ensuring that the transmitting power index requirements of the RF transmitting component are met.

[0065] Meanwhile, considering that the large instantaneous bandwidth technology in this embodiment mainly involves frequency conversion of 2 GHz to 18 GHz RF signals and 0.3 GHz to 2.3 GHz intermediate frequency signals, the working bandwidth and overlapping bandwidth of each stage of the filter are both greater than 2 GHz. At the same time, by reasonably allocating the relevant indicators of circuit gain, attenuation, and filtering, it is possible to ensure that other predetermined technical indicators are achieved within the 2 GHz instantaneous bandwidth of the component.

[0066] To control the spectrum quality, the RF transmitting component uses a three-stage frequency conversion method for mixing. The component spectrum quality control scheme is combined with the saturation limiting design. In addition to using a mixer (MM1-18,50H) with excellent self-indicators, through reasonable channel gain and attenuation design, it is ensured that the mixing input signal is not greater than -5 dBm, so as to give full play to the excellent performance of the mixer. At the same time, miniaturized filters such as on-chip filter banks (BWSBF-R8 / 18-7A) and MEMS filters are used to reduce the component structure size on the premise of meeting the filtering performance, thereby realizing the signal spectrum quality within the 2 GHz instantaneous bandwidth. The intermediate frequency mixing schematic diagram and the RF mixing schematic diagram are respectively as Figure 4 、 Figure 5 shown.

[0067] To ensure the receiving dynamic effect of the RF transmitting component, the receiving dynamic design scheme of the RF transmitting component needs to be combined with the spectrum quality control scheme. First, the broadband amplifier + fixed attenuator are used to optimize the 25dB receiving dynamic in a step-by-step saturation manner on the 2GHz - 18GHz input signal channel. Then, the harmonic signals generated by the amplifier saturation are filtered through the upper filter bank (BWSBF-R8 / 18-7A) to ensure the spectrum quality and power amplitude of the signal input before mixing. On this basis, the same amplifier + fixed attenuator are used to optimize the 25dB receiving dynamic in a step-by-step saturation manner on the C-band intermediate frequency signal channel, so that the received intermediate frequency signal can be ensured to be within a small power range when input in the entire dynamic range, and it is within the normal working window of DRFM, thereby achieving the receiving dynamic range within the 2GHz instantaneous bandwidth.

[0068] In the specific implementation process, according to the actual application requirements, the radar radiation source simulator based on the bidirectional microwave link provided in this implementation can reach the following technical indicators:

[0069] (1) RF frequency: (2 - 18)GHz;

[0070] (2) Intermediate frequency: 0.3 - 2.3GHz

[0071] (2) Receiving sensitivity: ≯ -60dBm;

[0072] (3) Receiving power dynamic: ≮ 50dB;

[0073] (4) Output power range: +10dBm - -10dBm;

[0074] (5) Instantaneous bandwidth: 2GHz;

[0075] In the actual application process, the volume of the RF transceiver component can be controlled within 148mm × 100mm × 15mm. That is, within the volume of 148mm × 100mm × 15mm, the reception and transmission of S / C / X / Ku-band signals are realized, the intermediate frequency bandwidth reaches 2GHz, which well solves the problems of wide frequency band, high-sensitivity reception, large dynamic range reception, large instantaneous bandwidth, and miniaturization integration, realizes the up-conversion and down-conversion of wide-band signals, and at the same time has functions such as gain control. The principle of the RF transmitting component adopts a design scheme of triple frequency conversion for both reception and transmission, shares the microwave link for transceiver, and has the ability of multi-channel filtering.

[0076] In the actual assembly process of the RF transceiver component provided in this embodiment, the front of the RF transmitting component structure is micro-assembled, the back is the power supply board, and the two sides are bonded through glass insulators or gold wires. The control and power supply ports of the MDM1-37 micro-rectangular socket can be utilized. The front of the RF transmitting component structure contains single-function microwave bare chips and multi-function chips.

[0077] Those skilled in the art can understand that all or part of the processes of 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.

[0078] As mentioned above, only the preferred specific embodiments of the present invention are described, 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 by the protection scope of the present invention.

Claims

1. A radar radiation source simulator based on a bidirectional microwave link, characterized in that The simulator includes: an antenna, a radio frequency transceiver component, a radar simulation component, and a power amplifier; where the antenna transmits the received radio frequency input signal to the radio frequency transceiver component; the radio frequency transceiver component performs down-conversion regulation on the radio frequency input signal to obtain an intermediate frequency output signal and a radio frequency detection result; the radar simulation component receives and processes the intermediate frequency output signal and the radio frequency detection result to generate a multi-target radar simulation intermediate frequency signal; the radio frequency transceiver component performs up-conversion regulation on the multi-target radar simulation intermediate frequency signal to obtain a radar simulation radio frequency output signal; the power amplifier amplifies the power of the radar simulation radio frequency output signal and then transmits it via the antenna; wherein, the radio frequency transceiver component has a built-in bidirectional microwave link for implementing time-sharing regulation between up-conversion regulation and down-conversion regulation.

2. The radar radiation source simulator based on a bidirectional microwave link according to claim 1, characterized in that, The radar simulation component includes a modulation parameter determination module, a false target modulation module, and a superposition module; where the modulation parameter determination module is used to generate multiple sets of matching false target modulation parameters according to the radio frequency detection result; the false target modulation module modulates the intermediate frequency output signal according to each set of false target modulation parameters respectively to obtain corresponding radar modulation signals; the superposition module is used to superpose all the radar modulation signals to obtain a multi-target radar simulation intermediate frequency signal; the superposition module directly sends the multi-target radar simulation intermediate frequency signal to the radio frequency transceiver component.

3. The radar radiation source simulator based on a bidirectional microwave link according to claim 2, wherein The false target modulation parameters include delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters.

4. The radar radiation source simulator based on a bidirectional microwave link according to claim 3, characterized in that, In the modulation parameter determination module, the delay, Doppler, and amplitude are determined according to the radio frequency detection result; and several delay modulation parameters, Doppler modulation parameters, and amplitude modulation parameters are designed based on the delay, Doppler, and amplitude, and multiple sets of false target modulation parameters are obtained by combination.

5. The radar radiation source simulator based on a bi-directional microwave link according to any one of claims 1 to 4, characterized in that, The radio frequency transceiver component further includes: a radio frequency input channel, an intermediate frequency output channel, an intermediate frequency input channel, a radio frequency output channel, and a bidirectional microwave link; where the input end of the radio frequency input channel is used to receive the radio frequency input signal, the output end of the radio frequency input channel is connected to the up-conversion regulation input end of the bidirectional microwave link, the up-conversion regulation output end of the bidirectional microwave link is connected to the input end of the intermediate frequency output channel, and the output end of the intermediate frequency output channel is used to output the intermediate frequency output signal; the input end of the intermediate frequency input channel is used to receive the multi-target radar simulation intermediate frequency signal, the output end of the intermediate frequency input channel is connected to the down-conversion regulation input end of the bidirectional microwave link, the down-conversion regulation output end of the bidirectional microwave link is connected to the input end of the radio frequency output channel, and the output end of the radio frequency output channel is used to transmit the radar simulation radio frequency output signal; for the bidirectional microwave link, when the radio frequency transmitting component is used to receive the radio frequency input signal, the up-conversion regulation link is enabled; when the radio frequency transmitting component is used to transmit the radar simulation radio frequency output signal, the down-conversion regulation link is enabled.

6. The radar radiation source simulator based on a two-way microwave link according to claim 5, characterized in that, The bidirectional microwave link includes a first single-pole double-throw switch, a 2-18G multiplex filter, a double-balanced mixer, a K-band band-pass filter, a bidirectional amplifier, and a second single-pole double-throw switch; where The first moving terminal and the second moving terminal of the first single-pole double-throw switch are respectively used as the up-conversion regulation input terminal and the down-conversion regulation output terminal; the fixed terminal of the first single-pole double-throw switch is connected to one end of the 2-18G multi-channel filter, the other end of the 2-18G multi-channel filter is connected to the intermediate frequency terminal IF of the double-balanced mixer, the radio frequency terminal RF of the double-balanced mixer is connected to one end of the K-band band-pass filter, and the local oscillator terminal LO of the double-balanced mixer receives the first broadband local oscillator signal; The other end of the K-band band-pass filter is connected to one end of the bidirectional amplifier, the other end of the bidirectional amplifier is connected to the fixed terminal of the second single-pole double-throw switch, and the first moving terminal and the second moving terminal of the second single-pole double-throw switch are respectively used as the up-conversion regulation output terminal and the down-conversion regulation input terminal.

7. The radar radiation source simulator based on a bidirectional microwave link according to claim 6, characterized in that, The radio frequency transmitting component further includes a microwave link control module; When the radio frequency transmitting component is used to receive a radio frequency input signal, the microwave link control module sends an up-conversion regulation instruction to the bidirectional microwave link; based on the received up-conversion regulation instruction, the bidirectional microwave link controls the connection between the first moving terminal and the fixed terminal of the first single-pole double-throw switch and the connection between the first moving terminal and the fixed terminal of the second single-pole double-throw switch to enable the up-conversion regulation link; When the radio frequency transmitting component is used to transmit a multi-target radar analog intermediate frequency signal, the microwave link control module also sends a down-conversion regulation instruction to the bidirectional microwave link; based on the received down-conversion regulation instruction, the bidirectional microwave link controls the connection between the second moving terminal and the fixed terminal of the first single-pole double-throw switch and the connection between the second moving terminal and the fixed terminal of the second single-pole double-throw switch to enable the down-conversion regulation link.

8. The radar radiation source simulator based on a bidirectional microwave link according to claim 7, characterized in that The intermediate frequency output channel includes a second mixer, a first S / C-band band-pass filter, a coupler, a third mixer, a pulse detector, and an L-band filter amplifier; wherein, The radio frequency terminal RF of the second mixer is used as the input terminal of the intermediate frequency output channel, the intermediate frequency terminal IF of the second mixer is connected to the input terminal of the first S / C-band band-pass filter, the output terminal of the first S / C-band band-pass filter is connected to the input terminal of the coupler, the through terminal of the coupler is connected to the radio frequency terminal RF of the third mixer, the intermediate frequency terminal IF of the third mixer is connected to the input terminal of the L-band filter amplifier, and the output terminal of the L-band filter amplifier is used as the output terminal of the intermediate frequency output channel; The local oscillator terminal LO of the second mixer is used to receive the second fixed local oscillator signal; the local oscillator terminal LO of the third mixer is used to receive the third fixed local oscillator signal; The coupled terminal of the coupler is connected to the input terminal of the pulse detector, and the output terminal of the pulse detector is used to output the detection result.

9. The radar radiation source simulator based on a bi-directional microwave link according to claim 8, characterized in that The intermediate frequency input channel includes a fourth mixer, a second S / C-band band-pass filter, an S / C-band amplifier, and a fifth mixer; wherein, The intermediate frequency terminal IF of the fourth mixer is used as the input terminal of the intermediate frequency input channel, the radio frequency terminal RF of the fourth mixer is connected to the input terminal of the second S / C-band band-pass filter, the output terminal of the second S / C-band band-pass filter is connected to the input terminal of the S / C-band amplifier, the output terminal of the S / C-band amplifier is connected to the intermediate frequency terminal IF of the fifth mixer, and the radio frequency terminal RF of the fifth mixer is used as the output terminal of the intermediate frequency input channel; The local oscillator terminal LO of the fifth mixer is used to receive the second fixed local oscillator signal; the local oscillator terminal LO of the fourth mixer is used to receive the third fixed local oscillator signal.

10. The radar radiation source simulator based on a bidirectional microwave link according to claim 9, characterized in that, The RF output channel includes a 2-18G saturation amplifier and an electronically tunable attenuator; wherein, the input end of the 2-18G saturation amplifier serves as the input end of the RF output channel, the output end of the 2-18G saturation amplifier is connected to the input end of the electronically tunable attenuator, and the output end of the electronically tunable attenuator serves as the output end of the RF output channel.

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