CN117767966A - Millimeter wave self-adaptive amplitude and time delay compensation method and channel device - Google Patents

Abstract

The invention discloses a millimeter wave self-adaptive amplitude and time delay compensation method and a channel device, wherein the device comprises the following steps: the device comprises a filtering unit A1, an amplifying unit A2, a coupling unit A3, switching units A4-A6, amplitude compensation units A7-A10, switching units A11-A13, a frequency conversion unit A14, a local oscillation unit A15, a filtering unit A16, a gain control unit A17, an amplifying unit A18, a time delay compensation unit A19, a coupling unit A20, detection units A21-A22, a power supply unit A23, a control unit A24 and a driving unit A25. The technical scheme of the invention solves the problems of amplitude and phase distortion caused by cascade connection and mismatch of devices in broadband millimeter wave communication, effectively improves the transmission quality of channels in communication, radar and measurement and control systems, thereby improving the overall performance indexes of the communication, radar and measurement and control systems, greatly improving the transmission code rate and the signal transmission reliability, and is suitable for all communication, radar and measurement and control systems.

Description

Millimeter wave self-adaptive amplitude and time delay compensation method and channel device

Technical Field

The invention relates to the technical field of millimeter wave wireless communication, in particular to a millimeter wave self-adaptive amplitude and time delay compensation method and a channel device.

Background

With the high-speed development of modern communication, radar and measurement and control technologies and the improvement of integrated circuit technologies, the requirements on indexes of related equipment are higher and higher. In the millimeter wave communication field, along with diversification of communication modulation modes and increasing of channel transmission capacity, the code rate of data transmission of a communication system is gradually accelerated, and requirements on various characteristics of channel transmission are higher and higher.

The frequency conversion channel is used as an important component of communication, radar and measurement and control systems, the characteristics of the channel directly influence the performance of the whole system, the frequency conversion channel amplifies, filters, converts and attenuates signals, the frequency conversion channel needs to process the signals through an amplifier, a filter, a mixer and an attenuator, the amplitude-frequency characteristic of the frequency conversion channel mainly comprises indexes such as frequency conversion gain, gain flatness, spurious suppression and the like, and the phase-frequency characteristic of the frequency conversion channel mainly comprises indexes such as amplitude-phase conversion and output P-1 and the like. The existing compensation methods based on amplitude and time delay are single, one is that amplitude frequency characteristics of a channel are compensated through an amplitude equalizer, and the compensation method of a broadband product has no obvious effect because an applicable frequency band is not provided; the other is to adjust the delay of the whole broadband by adding a cable or a microstrip line, the adjustment values of different frequencies are the same, and compensation cannot be performed for the different frequencies. The existing compensation method cannot meet the modern communication requirements of high-speed development, and with the high-speed development of communication, radar and measurement and control technologies, a channel amplitude and time delay compensation method is required to solve the problems of transmission amplitude and phase distortion in broadband communication.

Disclosure of Invention

The invention provides a millimeter wave self-adaptive amplitude and time delay compensation method and a channel device, which solve the problems of amplitude and phase distortion caused by multi-device cascading in communication, radar and measurement and control systems.

In the first aspect, a millimeter wave adaptive amplitude and time delay compensation channel device comprises a filtering unit A1, an amplifying unit A2, a coupling unit A3 and a switch module which are sequentially connected, wherein the switch module is sequentially connected with a frequency conversion unit A14, a filtering unit A16, a gain control unit A17, an amplifying unit A18, a time delay compensation unit A19 and a coupling unit A20; the coupling unit A3 is also connected with a detection unit A21, and the coupling unit A2 is also connected with a detection unit A22; the frequency conversion unit A14 is also connected with a local oscillation unit A15.

Further, the switch module is provided with a switch unit A4 close to the signal input end, the other end is provided with a switch unit A13, two branches are arranged between the two units, and one branch is connected with the switch unit A5 and the switch unit A11 to sort the amplitude compensation unit A7 and the amplitude compensation unit A8; the other branch is connected with the switch unit A6 and the switch unit A12 to sort the amplitude compensation unit three A9 and the amplitude compensation unit four A10.

Further, the switch unit comprises a millimeter wave switch circuit, a blocking capacitor and a logic conversion circuit, adopts a symmetrical design, ensures equal length of each microstrip, adopts the logic conversion circuit to perform two-stage switch association control, and selects different amplitude compensation units to meet the requirements of different systems on amplitude compensation; the amplitude compensation unit reads the data of the vector network analyzer according to the control unit, and the self-adaptive compensation of the amplitude is realized by adopting an algorithm through closed loop optimization.

Further, the DC/DC voltage regulator further comprises a power supply unit A23, wherein the power supply unit A23 comprises a DC/DC circuit, an LDO linear voltage stabilizing circuit and a filtering circuit, the input DC voltage is filtered, then the input DC voltage is detected and enters the DC/DC circuit to reduce the voltage, and the voltage is continuously reduced by adopting a linear stabilizer, so that the required DC voltage is provided for each unit.

Further, a control unit a24 and a driving unit a25 are also included; the control unit A24 comprises an FPGA, an ARM, a memory, a network communication circuit and a peripheral circuit, reads signal quality data output by the vector network analyzer through network communication, analyzes amplitude and time delay data, firstly gives a preferred compensation scheme to compensate, then collects the compensated amplitude and time delay data, automatically superior to each other through repeated cyclic compensation collection and closed loop, finally cures superior parameters, and enables the amplitude and time delay data to be almost close to a constant; the driving unit A25 converts LVTTL level of the FPGA into control signals required by controlling the switch and amplitude control.

Further, the amplifying unit includes a millimeter broadband amplifier and a power supply circuit thereof, the amplifying unit A2 amplifies the millimeter wave signal, and the amplifying unit a18 amplifies the L frequency signal.

Further, the coupling unit includes a coupler and a fixed attenuator, couples a portion of the input radio frequency signal for power detection, and provides data for gain control.

Further, the gain control unit comprises a numerical control attenuator, a blocking chip capacitor and a microstrip matching branch node, and the gain is adjusted.

On the other hand, the millimeter wave self-adaptive amplitude and time delay compensation method is realized based on the millimeter wave self-adaptive amplitude and time delay compensation channel device, and comprises the following steps:

the external input signal is filtered and selected by the filtering unit and then amplified with low noise, and the amplified signal is selected by the switching unit to carry out different amplitude compensation;

and mixing the signal with a local oscillator to generate an L-band signal, filtering the useless signal by a filtering unit, only preserving the useful signal, amplifying the useful signal, and outputting the amplified signal after time delay.

The invention has the beneficial effects that: the invention provides a millimeter wave self-adaptive amplitude and time delay compensation method and a channel device, which adopt a miniaturized design, and a plurality of unit circuits are integrated on a silicon-based chip, so that the consistency of the channel circuits is ensured in design, and the cost of the channel device is reduced. Because the channel reduces the use of the separating element, the discreteness of the channel device is better, which is helpful to improve the matching of each stage of the channel device and reduce the distortion or distortion of the amplitude; the broadband design is adopted, so that the method can be suitable for most frequency bands in millimeter waves, or by replacing a small number of elements, the method can be used for other frequency bands, the amplitude distortion and the phase distortion of a communication system caused by the acceleration of the code rate of data transmission, the mismatch between device stages or the superposition of S parameters are solved, and the communication quality of communication, a radar and a measurement and control system is improved.

Drawings

FIG. 1 is a schematic diagram of a millimeter wave adaptive amplitude and time delay compensation channel device of the present invention;

FIG. 2 is a schematic diagram of millimeter wave amplification gain curves in an embodiment of the present invention;

FIG. 3 is a schematic diagram of an L-band amplification gain curve according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a coupling unit principle framework in an embodiment of the invention;

FIG. 5 is a simulation diagram of the input standing wave ratio of the coupling unit in an embodiment of the present invention;

FIG. 6 is a simulation diagram of the output standing wave ratio of the coupling unit in an embodiment of the present invention;

FIG. 7 is a simulation of the insertion loss of a coupling unit in an embodiment of the present invention;

FIG. 8 is a simulation diagram of the coupling degree of a coupling unit in an embodiment of the present invention;

FIG. 9 is a schematic block diagram of a switching unit circuit in an embodiment of the invention;

FIG. 10 is a schematic diagram of an amplitude compensation unit in accordance with an embodiment of the present invention;

FIG. 11 is a schematic diagram illustrating the operation of the amplitude compensation unit according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a schematic frame of a delay compensation unit in an embodiment of the invention;

FIG. 13 is a schematic block diagram of a power supply unit circuit in an embodiment of the invention;

fig. 14 is a schematic block diagram of a control unit circuit in an embodiment of the invention.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

In order to solve the problems in the prior art, the invention provides a millimeter wave self-adaptive amplitude and time delay compensation method and a channel device, in a first aspect, the millimeter wave self-adaptive amplitude and time delay compensation channel device, as shown in fig. 1, a signal input end to an output end comprise a filtering unit A1, an amplifying unit A2, a coupling unit A3 and a switch module which are sequentially connected, wherein the switch module is sequentially connected with a frequency conversion unit A14, a filtering unit A16, a gain control unit A17, an amplifying unit A18, a time delay compensation unit A19 and a coupling unit A20; the coupling unit A3 is also connected with a detection unit A21, and the coupling unit A2 is also connected with a detection unit A22; the frequency conversion unit A14 is also connected with a local oscillation unit A15.

The switch module is provided with a switch unit A4 close to the signal input end, the other end is provided with a switch unit A13, two branches are arranged between the two units, and one branch is connected with the switch unit A5 and the switch unit A11 to sort an amplitude compensation unit A7 and an amplitude compensation unit A8; the other branch is connected with the switch unit A6 and the switch unit A12 to sort the amplitude compensation unit three A9 and the amplitude compensation unit four A10. The switching unit comprises a millimeter wave switching circuit, a blocking capacitor and a logic conversion circuit, adopts symmetrical design, ensures equal length of each path of microstrip, adopts the logic conversion circuit to control the two-stage switch in a opposite way, and selects different amplitude compensation units to meet the requirements of different systems on amplitude compensation; the amplitude compensation unit reads the data of the vector network analyzer according to the control unit, and the self-adaptive compensation of the amplitude is realized by adopting an algorithm through closed loop optimization.

In this embodiment, the power supply unit a23 is further included, where the power supply unit a23 includes a DC/DC circuit, an LDO linear voltage stabilizing circuit, and a filtering circuit, where the input DC voltage is filtered first, then the input DC voltage is detected by current and then enters the DC/DC circuit to reduce the voltage, and then the voltage is reduced continuously by using a linear stabilizer, so as to provide the required DC voltage for each unit. Also comprises a control unit A24 and a driving unit A25; the control unit A24 comprises an FPGA, an ARM, a memory, a network communication circuit and a peripheral circuit, reads signal quality data output by the vector network analyzer through network communication, analyzes amplitude and time delay data, firstly gives a preferred compensation scheme to compensate, then collects the compensated amplitude and time delay data, automatically superior to each other through repeated cyclic compensation collection and closed loop, finally cures superior parameters, and enables the amplitude and time delay data to be almost close to a constant; the driving unit A25 converts LVTTL level of the FPGA into control signals required by controlling the switch and amplitude control.

In this embodiment, the amplifying unit includes a millimeter broadband amplifier and a power supply circuit thereof, the amplifying unit A2 amplifies the millimeter wave signal, and the amplifying unit a18 amplifies the L frequency signal. The coupling unit comprises a coupler and a fixed attenuator, an input radio frequency signal is coupled with a part of the input radio frequency signal for power detection, data is provided for gain control, and the gain control unit comprises a numerical control attenuator, a blocking chip capacitor and a microstrip matching branch joint, so that gain is adjusted.

On the other hand, the invention also correspondingly provides a millimeter wave self-adaptive amplitude and time delay compensation method, which is realized based on the millimeter wave self-adaptive amplitude and time delay compensation channel device and comprises the following steps:

the external input signal is filtered and selected by the filtering unit and then amplified with low noise, and the amplified signal is selected by the switching unit to carry out different amplitude compensation; and mixing the signal with a local oscillator to generate an L-band signal, filtering the useless signal by a filtering unit, only preserving the useful signal, amplifying the useful signal, and outputting the amplified signal after time delay.

In one embodiment, a method and apparatus for millimeter wave adaptive channel amplitude and delay compensation, as shown in fig. 1, includes: the device comprises an A1 filtering unit, an A2 amplifying unit, an A3 coupling unit, A4-A6 switching units, A7-A10 amplitude compensation units, A11-A13 switching units, an A14 frequency conversion unit, an A15 local oscillation unit, an A16 filtering unit, an A17 gain control unit, an A18 amplifying unit, an A19 time delay compensation unit, an A20 coupling unit, an A21-A22 detection unit, an A23 power supply unit, an A24 control unit and an A25 driving unit.

The A1 and A16 filtering units select the needed signals, so that the needed signals can pass through almost without loss, and the unnecessary signals can be attenuated greatly.

The A2 and A18 amplifying units are mainly used for signal amplification, but the working frequencies of the two amplifying units are inconsistent, the A2 amplifies millimeter wave signals, and the A18 amplifies L frequency signals.

A3 and A20 coupling units couple signals passing through the device all the way to detection.

The A4-A6 and A11-A13 switch units switch different amplitude compensation units according to the system requirement to realize different amplitude compensation.

And A7-A10 amplitude compensation units are used for reading the data of the vector network analyzer according to the control unit, and the self-adaptive compensation of the amplitude is realized by adopting an algorithm through closed-loop optimization.

The A14 frequency conversion unit mainly realizes the frequency change and changes the millimeter wave signal into the L frequency band.

A15 local oscillation unit provides the required local oscillation signal for frequency conversion, and the packet lock loop circuit, the amplifying circuit and the filter circuit.

A17 gain control unit calculates the gain of the channel device according to the input and output detection, or adjusts the link gain of the device according to the system requirement;

and A19, the delay compensation unit reads the data of the vector network analyzer according to the control unit, and the self-adaptive compensation of the delay is realized by adopting an algorithm through closed-loop optimization.

The A21 and A22 detection units convert the coupled radio frequency signals into voltage signals.

The A23 power supply unit provides power supply for the whole device.

The A24 control unit provides a compensation algorithm, a control signal and state monitoring for the whole channel device, and the control signal controls the switch to switch after passing through the driving unit, the amplitude compensation unit and the time delay compensation unit, so that self-correction of amplitude and time delay is realized.

The A25 driving unit converts LVTTL level of the FPGA into control signals required by control switch and amplitude control.

In this embodiment, the working principle of the channel device is: the external input signal is filtered and selected, then amplified with low noise, the amplified signal is selected by a switch unit to carry out different amplitude compensation, then mixed with a local oscillator to generate L-band signals, a plurality of unwanted signals can be generated due to mixing, a filtering unit is required to filter useless signals, only useful signals are reserved, the useful signals are amplified, and the amplified signals are output after time delay.

The principle of the channel device is that an amplitude compensation unit and a time delay compensation unit are added on common frequency conversion equipment, so that the problems of amplitude distortion and phase distortion caused by the acceleration of the code rate of data transmission, the mismatch between device stages or the superposition of S parameters of a communication system are solved, the communication quality of communication, a radar and a measurement and control system is improved, and each unit is described in detail below.

And a filtering unit: a filter is one of the most critical elements in a communication system, and in a channel, it plays an important role in selecting a signal. Its main performance indexes include working frequency, in-band fluctuation, insertion loss, group delay and port standing wave, etc. Its performance index has a great influence on the performance index of the whole channel device, and its rejection capability to harmonic noise and the selection of useful signals directly influence the quality of the whole wireless communication system. The group delay index of the filter is worse than other elements of the channel, and the main reason is that the other elements are all broadband devices, so that the influence on the group delay is very small, and only a few leather notes to a few lower leather notes are needed. The millimeter wave filtering unit adopts a chip design, so that the volume of the channel device can be reduced, and inter-stage matching can be optimized. Different filter chips can be selected according to different frequency bands, and only the image frequency suppression and the out-of-band spurious suppression are required to be ensured.

The amplifying unit mainly comprises a millimeter broadband amplifier and a power supply circuit, the using environment of the amplifier is small signal processing, the low-noise high-P-1 GaAs material amplifier is adopted, and the gain is shown in figure 2. The working principle and circuit of the L-band amplifier are consistent with those of the millimeter wave amplifier, and the gain curve is shown in fig. 3.

The coupling unit mainly comprises a coupler and a fixed attenuator. The specific working principle block diagram is shown in figure 4. The coupling unit mainly comprises a coupler and a fixed attenuator, and has the main functions of coupling an input radio frequency signal into a part for power detection, providing data for gain control, and designing the fixed attenuator for ensuring the matching with the front stage and the rear stage, wherein the standing wave ratio of the input and the output can be smaller than 1.2 through ADS simulation. The coupling port is designed with a fixed attenuator, so that the coupling degree of the coupling unit is 20dB, the loss fluctuation is less than or equal to 0.5dB in the 27 GHz-40 GHz band, and the coupling fluctuation is less than or equal to 0.5dB, as shown in figures 5-8.

The switch unit mainly comprises a millimeter wave switch circuit, a blocking capacitor and a logic conversion circuit, the working principle block diagram is shown in figure 9, the switch unit mainly comprises the millimeter wave switch circuit, the blocking capacitor and the logic conversion circuit, 3 switches are connected according to the principle block diagram, and the symmetrical design is adopted to ensure that each path of microstrip has equal length. The logic conversion circuit is used for oppositely switching on the two-stage switch association control, so that unstable control caused by IO control confusion of the FPGA is avoided. The main function of the switch unit is to select different amplitude compensation units to meet the requirements of different systems for amplitude compensation.

The amplitude compensation unit consists of a varactor diode, a capacitor, a microstrip circuit and a control circuit, and the working principle block diagram is shown in fig. 10 and 11: the main function is to read the test result of the vector network analyzer of the device through the control unit and the external different voltage change amplitude compensation center frequency and compensation quantity, and to combine the internal algorithm to optimize for several times, and to select the optimal strategy curing amplitude compensation parameter with the best effect.

The gain control unit mainly comprises a numerical control attenuator, a blocking chip capacitor and a microstrip matching branch joint, and has the main functions of adjusting the gain of the device and designing the matching branch joint for better matching input and output with the front and rear stages.

The time delay compensation unit mainly comprises a varactor diode, an inductor, a resistor, a capacitor and a control circuit, and the working principle block diagram is shown in figure 12. The main function is to change the central frequency and the compensation amount of the time delay compensation by the control unit and different voltages, read the test result of the vector network analyzer, and select the strategy curing time delay compensation parameter with the best effect by combining with the internal algorithm for multiple optimization.

The power supply unit mainly comprises a DC/DC circuit, an LDO linear voltage stabilizing circuit and a filtering circuit, and the working principle block diagram is shown in figure 13. The power supply unit mainly comprises a DC/DC circuit, an LDO linear voltage stabilizing circuit and a filtering circuit, and has the main functions of filtering input direct-current voltage, detecting current, then entering the DC/DC voltage reducing circuit, reducing the voltage to +5.4V, and reducing the voltage to +5V/+3.3V/+1.8V by adopting a linear stabilizer to provide required direct-current voltage for each unit.

The control unit mainly comprises an FPGA, an ARM, a memory, a network communication circuit and a peripheral circuit, the working principle block diagram is shown in figure 14, the control unit mainly comprises the FPGA, the ARM, the memory, the network communication circuit and the peripheral circuit, the main functions are that the vector network analyzer outputs signal quality data through network communication, amplitude and time delay data are analyzed, a preferable compensation scheme is given for compensation, amplitude and time delay data after compensation are collected, the closed loop is automatically better than the parameters after repeated cycle compensation collection, and finally curing is better than the parameters, so that the amplitude and time delay data are almost close to a constant.

The ARM circuit mainly completes ADC sampling of input and output radio frequency power, performs table look-up conversion, calculates the gain of the device and reports the gain to a system for use; simultaneously writing the optimized parameters into a memory, and reading the solidified parameters after each power-on, so as to directly use the parameters; through data exchange with the network communication chip, the system can realize network communication with the outside, and can read and operate test equipment such as a vector network analyzer, a frequency spectrograph, a signal source and the like, or communicate with the system through a serial port and report the state.

The millimeter wave self-adaptive amplitude and time delay compensation method and the channel device solve the problems of amplitude and phase distortion caused by device cascading and mismatch in broadband millimeter wave communication, effectively improve the transmission quality of channels in communication, radar and measurement and control systems, improve the overall performance indexes of the communication, radar and measurement and control systems, and greatly improve the transmission code rate and the signal transmission reliability, and are used for all communication, radar and measurement and control systems.

The foregoing has shown and described the basic principles and features of the invention and the advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The millimeter wave self-adaptive amplitude and time delay compensation channel device is characterized in that a signal input end to an output end comprise a filtering unit A1, an amplifying unit A2, a coupling unit A3 and a switch module which are sequentially connected, wherein the switch module is sequentially connected with a frequency conversion unit A14, a filtering unit A16, a gain control unit A17, an amplifying unit A18, a time delay compensation unit A19 and a coupling unit A20; the coupling unit A3 is also connected with a detection unit A21, and the coupling unit A2 is also connected with a detection unit A22; the frequency conversion unit A14 is also connected with a local oscillation unit A15.

2. The millimeter wave self-adaptive amplitude and time delay compensation channel device according to claim 1, wherein the switch module is provided with a switch unit A4 close to a signal input end, the other end is provided with a switch unit A13, two branches are arranged between the two units, and one branch is connected with the switch unit A5 and the switch unit A11 to sort an amplitude compensation unit A7 and an amplitude compensation unit A8; the other branch is connected with the switch unit A6 and the switch unit A12 to sort the amplitude compensation unit three A9 and the amplitude compensation unit four A10.

3. The millimeter wave self-adaptive amplitude and time delay compensation channel device according to claim 2, wherein the switching unit comprises a millimeter wave switching circuit, a blocking capacitor and a logic conversion circuit, and the symmetrical design is adopted to ensure that each microstrip has equal length, and two stages of switches are controlled in a correlated manner through the logic conversion circuit, so that different amplitude compensation units are selected to meet the requirements of different systems on amplitude compensation; the amplitude compensation unit reads the data of the vector network analyzer according to the control unit, and the self-adaptive compensation of the amplitude is realized by adopting an algorithm through closed loop optimization.

4. The millimeter wave self-adaptive amplitude and time delay compensation channel device according to claim 1, further comprising a power supply unit A23, wherein the power supply unit A23 comprises a DC/DC circuit, an LDO linear voltage stabilizing circuit and a filtering circuit, the input direct current voltage is filtered, then enters the DC/DC circuit after current detection to reduce the voltage, and then the linear stabilizer is adopted to continuously reduce the voltage, so that the required direct current voltage is provided for each unit.

5. The millimeter wave adaptive amplitude and time delay compensation channel device according to claim 1, further comprising a control unit a24 and a driving unit a25; the control unit A24 comprises an FPGA, an ARM, a memory, a network communication circuit and a peripheral circuit, reads signal quality data output by the vector network analyzer through network communication, analyzes amplitude and time delay data, firstly gives a preferred compensation scheme to compensate, then collects the compensated amplitude and time delay data, automatically superior to each other through repeated cyclic compensation collection and closed loop, finally cures superior parameters, and enables the amplitude and time delay data to be almost close to a constant; the driving unit A25 converts LVTTL level of the FPGA into control signals required by controlling the switch and amplitude control.

6. The adaptive amplitude and time delay compensation channel device for millimeter waves according to claim 1, wherein the amplifying unit comprises a millimeter broadband amplifier and a power supply circuit thereof, the amplifying unit A2 amplifies millimeter wave signals, and the amplifying unit a18 amplifies L frequency signals.

7. The millimeter wave adaptive amplitude and time delay compensation channel device of claim 1, wherein said coupling unit comprises a coupler and a fixed attenuator, coupling an input radio frequency signal to a portion for power detection, providing data for gain control.

8. The millimeter wave adaptive amplitude and time delay compensation channel device according to claim 1, wherein the gain control unit comprises a digital control attenuator, a blocking chip capacitor and a microstrip matching branch node, and the gain is adjusted.

9. A millimeter wave adaptive amplitude and time delay compensation method, based on the implementation of the millimeter wave adaptive amplitude and time delay compensation channel device according to any one of claims 1-8, comprising:

the external input signal is filtered and selected by the filtering unit and then amplified with low noise, and the amplified signal is selected by the switching unit to carry out different amplitude compensation;

and mixing the signal with a local oscillator to generate an L-band signal, filtering the useless signal by a filtering unit, only preserving the useful signal, amplifying the useful signal, and outputting the amplified signal after time delay.