Multi-channel radar receiving system

Abstract

The present disclosure provides a multi-channel radar receiving system, including an echo receiving channel and a data processing unit. The echo receiving channel includes a first receiving channel and a second receiving channel; the first receiving channel amplifies the received first echo signal and processes the amplified first echo signal into a first echo intermediate frequency signal; the second receiving channel amplifies the received second echo signal and processes the amplified second echo signal into a second echo intermediate frequency signal; wherein, the intensity of the first echo signal is less than a threshold value, and the intensity of the second echo signal is greater than the threshold value; the data processing unit is configured to perform in-phase and quadrature transformation on the received first echo intermediate frequency signal and second echo intermediate frequency signal to obtain amplitude and phase data, thereby greatly improving the dynamic range and sensitivity of the multi-channel radar receiving system of the present disclosure.

Description

Technical Field

[0001] The present disclosure relates to the field of radar technology, and in particular to a multi-channel radar receiving system. Background Art

[0002] A radar receiver is a device within a radar that amplifies, transforms, and processes echo signals. The dynamic range of a radar receiver refers to the range of input signals within which the receiver can detect the received signal without distortion, and is generally measured in terms of input signal power. If the received signal is too strong, it will cause amplifier distortion and introduce noise, leading to receiver overload and saturation. If the signal is too weak, it will be undetectable. Improving the dynamic range of a receiver is crucial to the advancement of radar technology. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present disclosure provides a multi-channel radar receiving system.

[0004] The present disclosure provides a multi-channel radar receiving system, comprising:

[0005] an echo receiving channel, the echo receiving channel comprising a first receiving channel and a second receiving channel; the first receiving channel amplifies a received first echo signal and processes the amplified first echo signal into a first echo intermediate frequency signal; the second receiving channel amplifies a received second echo signal and processes the amplified second echo signal into a second echo intermediate frequency signal; wherein the intensity of the first echo signal is less than a threshold value, and the intensity of the second echo signal is greater than a threshold value;

[0006] The data processing unit is configured to perform in-phase orthogonal transformation on the received first echo intermediate frequency signal and the second echo intermediate frequency signal to obtain amplitude and phase data.

[0007] In one embodiment of the present disclosure, the first receiving channel is a high-gain receiving channel, and the second receiving channel is a low-gain receiving channel.

[0008] In one embodiment of the present disclosure, the first receiving channel is used to filter and down-convert the received first echo signal into a first echo intermediate frequency signal; the second receiving channel is used to filter and down-convert the received second echo signal into a second echo intermediate frequency signal.

[0009] In one embodiment of the present disclosure, a horizontal channel and a first amplifier are further included. The horizontal channel is used to receive a horizontal echo signal, and the first amplifier outputs the received horizontal echo signal to the first receiving channel and the second receiving channel respectively.

[0010] In one embodiment of the present disclosure, the echo receiving channel further includes a third receiving channel and a fourth receiving channel; the third receiving channel amplifies the received third echo signal and processes the amplified third echo signal into a third echo intermediate frequency signal; the fourth receiving channel amplifies the received fourth echo signal and processes the amplified fourth echo signal into a fourth echo intermediate frequency signal; wherein, the intensity of the third echo signal is less than a threshold value, and the intensity of the fourth echo signal is greater than the threshold value; the data processing unit is configured to perform in-phase quadrature transformation on the received third echo intermediate frequency signal and fourth echo intermediate frequency signal to obtain amplitude and phase data.

[0011] In one embodiment of the present disclosure, it further includes a vertical channel and a second amplifier. The vertical channel is used to receive vertical echo signals and outputs the received vertical echo signals to the third receiving channel and the fourth receiving channel respectively through the second amplifier.

[0012] In one embodiment of the present disclosure, the first amplifier and the second amplifier are low-noise amplifiers.

[0013] In one embodiment of the present disclosure, the first receiving channel is a high-gain receiving channel, and the second receiving channel is a low-gain receiving channel;

[0014] The third receiving channel is used to filter and down-convert the received third echo signal into a third echo intermediate frequency signal; the fourth receiving channel is used to filter and down-convert the received strong echo signal into a fourth echo intermediate frequency signal.

[0015] In one embodiment of the present disclosure, the data processing unit includes: a first data processing device for performing analog-to-digital conversion on the first echo intermediate frequency signal, a second data processing device for performing analog-to-digital conversion on the second echo intermediate frequency signal, a third data processing device for performing analog-to-digital conversion on the third echo intermediate frequency signal, and a fourth data processing device for performing analog-to-digital conversion on the fourth echo intermediate frequency signal.

[0016] In one embodiment of the present disclosure, the first data processing device and the second data processing device perform calibration synthesis on the respective obtained intermediate frequency signals to obtain a data signal of the horizontal channel; the third data processing device and the fourth data processing device perform calibration synthesis on the respective obtained intermediate frequency signals to obtain a data signal of the vertical channel.

[0017] In one embodiment of the present disclosure, the third data processing device and the fourth data processing device perform calibration synthesis on the respective obtained intermediate frequency signals to obtain a data signal of the vertical channel.

[0018] One beneficial effect of the present disclosure is that in a multi-channel radar receiving system, the first receiving channel of the echo receiving channels can receive and process relatively strong echo signals, the second receiving channel can process and receive relatively weak echo signals, and the data processing unit can orthogonally synthesize the strong echo signals and the weak echo signals, thereby greatly improving the dynamic range and sensitivity of the radar receiving system.

[0019] Other features and advantages of the present disclosure will become clear through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the description thereof, are used to explain the principles of the present disclosure.

[0021] Figure 1 is a schematic structural diagram of a multi-channel radar receiving system provided by an embodiment of the present disclosure;

[0022] Figure 2 is a schematic structural diagram of the multi-channel radar receiving system applied to a dual-polarization radar;

[0023] Figure 3 is a schematic principle diagram of the multi-channel radar receiving system applied to a dual-polarization radar.

[0024] Figures 1 to 3 The one-to-one correspondence between the names of the components and the reference numerals in is as follows:

[0025] 11. First receiving channel; 12. Second receiving channel; 13. Third receiving channel; 14. Fourth receiving channel; 101. Horizontal channel; 102. Vertical channel; 103. First amplifier; 104. Second amplifier; 21. First data processing device; 22. Second data processing device; 23. Third data processing device; 24. Fourth data processing device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Now, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present disclosure.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure or its application or use.

[0028] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0029] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0030] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0031] In this document, "upper", "lower", "front", "rear", "left", "right", etc. are only used to represent the relative positional relationship between relevant parts, rather than defining the absolute positions of these relevant parts.

[0032] In this document, "first", "second", etc. are only used to distinguish each other, rather than indicating importance, order, and the prerequisite for mutual existence, etc.

[0033] In this document, "equal", "same", etc. are not strict mathematical and / or geometric limitations, but also include the allowable errors that can be understood by those skilled in the art and are permitted in manufacturing or use, etc.

[0034] Unless otherwise specified, the numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges included therein.

[0035] The present disclosure provides a multi-channel radar receiving system, including an echo receiving channel and a data processing unit. The echo receiving channel is used to receive and process echo signals, and the data processing unit is used to further perform analog-to-digital conversion and correction synthesis on the echo signals.

[0036] The echo receiving channel includes a first receiving channel and a second receiving channel; the first receiving channel receives a first echo signal and performs gain, and processes the first echo signal after gain into a first echo intermediate-frequency signal; the second receiving channel receives a second echo signal and performs gain, and processes the second echo signal after gain into a second echo intermediate-frequency signal. Wherein, the intensity of the first echo signal is less than the threshold, and the intensity of the second echo signal is greater than the threshold. The threshold of the echo signal can be set as needed. The echo signal with an intensity higher than the threshold is the first echo signal, and the echo signal with an intensity lower than the threshold is the second echo signal. The data processing unit is configured to perform in-phase quadrature transformation on the received first echo intermediate-frequency signal and second echo intermediate-frequency signal to obtain amplitude and phase data.

[0037] Multi-channel radar receiving systems can be applied to weather radars or other types of radars. The strength of the echo signal refers to the power of the echo signal. The echo signal strength of the weather radar depends on certain radar parameters, the scattering properties of the precipitation body, the distance from the scatterer to the radar, and the attenuation of the beam by the atmospheric medium in the propagation path. The nature of the weather system can be inferred from the echo intensity and distribution of the weather target. In addition, the echo signal strength is the basic data for radar to measure rainfall. Therefore, in radar observation, the analysis of the echo signal strength is crucial. The first receiving channel can receive and process relatively strong echo signals, and the second receiving channel can receive and process relatively weak echo signals. The data processing unit can perform orthogonal synthesis of the stronger echo signal and the weaker echo signal, thereby greatly improving the dynamic range and sensitivity of the radar receiving system, which is conducive to improving the stability and reliability of the back-end data processing.

[0038] In one embodiment of the present disclosure, Figure 1 As shown, the first receiving channel 11 is a high-gain receiving channel, and the second receiving channel 12 is a low-gain receiving channel. The first receiving channel 11 is used to filter and down-convert received weak echo signals into intermediate frequency signals. The second receiving channel 12 is used to filter and down-convert received strong echo signals into intermediate frequency signals.

[0039] Specifically, the first receiving channel 11 and the second receiving channel 12 may each include an amplifier for signal gain, a filter for filtering, and a frequency converter for down-conversion. The first receiving channel 11 utilizes a high-gain amplifier, while the second receiving channel 12 utilizes a low-gain amplifier. Of course, the first receiving channel 11 and the second receiving channel 12 may also utilize other components capable of gaining, filtering, and down-converting the echo signal. Amplifiers, filters, and frequency converters are all well known to those skilled in the art and will not be described in detail in this disclosure.

[0040] Gain compression occurs when the input power of an amplifier increases to the point where it reduces the amplifier's gain and causes a nonlinear increase in output power. When the input power reaches the gain compression point, the amplifier saturates and the output power remains constant. At this point, further increasing the input power does not change the output power.

[0041] The gain multiplier of first receive channel 11 is relatively high. When a strong echo signal enters first receive channel 11, it causes amplifier saturation, resulting in distortion of the strong echo signal. However, when a weak echo signal enters first receive channel 11, the gain is increased enough to bring it within the linear dynamic range of the radar receiving system. Therefore, the weak echo's IF signal is selected from the first echo IF signal processed by first receive channel 11.

[0042] The gain multiple of the second receiving channel 12 is relatively low. When a relatively strong echo signal enters the second receiving channel 12, it can reach the linear dynamic range of the radar receiving system after gain. When some relatively weak echo signals enter the second receiving channel 12, they can also reach the linear dynamic range of the radar receiving system. Among the second echo intermediate-frequency signals processed by the second receiving channel 12, the intermediate-frequency signals of the strong echoes are selected.

[0043] The multi-channel radar receiving system of the present disclosure can be applied to a dual-polarization radar. The dual-polarization radar can both transmit and receive horizontal polarization waves and transmit and receive vertical polarization waves. The dual-polarization radar includes a horizontal channel and a vertical channel for receiving echo signals.

[0044] In an implementation manner of the present disclosure, as Figure 2 、 Figure 3 shown, the multi-channel radar receiving system includes a horizontal channel 101 for receiving horizontal echo signals. The horizontal channel 101 is connected to the first receiving channel 11 and the second receiving channel 12, and is used to output the received horizontal echo signals to the first receiving channel 11 and the second receiving channel 12.

[0045] In a specific implementation manner of the present disclosure, the multi-channel radar receiving system further includes a first amplifier 103. The horizontal channel 101 is connected to the first receiving channel 11 and the second receiving channel 12 through the first amplifier 103. The horizontal channel 101 outputs the horizontal echo signals to the first amplifier 103. The first amplifier 103 divides the horizontal echo signals into a first echo signal and a second echo signal, and outputs the first echo signal to the first receiving channel 11 and the second echo signal to the second receiving channel 12. The first echo intermediate-frequency signals output by the first receiving channel 11 and the second echo intermediate-frequency signals output by the second receiving channel 12 are both intermediate-frequency signals of the horizontal echo.

[0046] In some implementation manners of the present disclosure, the echo receiving channel may further include more receiving channels for receiving echo signals. Different receiving channels may adopt different gain multiples to further improve the dynamic range of the radar receiving system.

[0047] In an implementation manner of the present disclosure, as Figure 2 、 Figure 3As shown, the echo receiving channel further includes a third receiving channel 13 and a fourth receiving channel 14. The third receiving channel 13 is used to receive the third echo signal, perform gain, and process the third echo signal after gain into a third echo intermediate frequency signal. The fourth receiving channel 14 is used to receive the fourth echo signal, perform gain, and process the fourth echo signal after gain into a fourth echo intermediate frequency signal. Among them, the intensity of the third echo signal is less than the threshold, and the intensity of the fourth echo signal is greater than the threshold. The data processing unit is configured to perform in-phase and quadrature transformation on the received third echo intermediate frequency signal and fourth echo intermediate frequency signal to obtain amplitude and phase data.

[0048] In an embodiment of the present disclosure, as Figure 2 , Figure 3 shown, the multi-channel radar receiving system further includes a vertical channel 102, and the vertical channel 102 is used to receive vertical echo signals. The vertical channel 102 is connected to the third receiving channel 13 and the fourth receiving channel 14, and is used to output the received vertical echo signals to the third receiving channel 13 and the fourth receiving channel 14.

[0049] In an embodiment of the present disclosure, the third receiving channel 13 is a high-gain receiving channel, and the fourth receiving channel 14 is a low-gain receiving channel. The third receiving channel 13 is used to filter and down-convert the received weak echo signal into an intermediate frequency signal. The fourth receiving channel 14 is used to filter and down-convert the received strong echo signal into an intermediate frequency signal.

[0050] Specifically, both the third receiving channel 13 and the fourth receiving channel 14 may include an amplifier for signal gain, a filter for filtering, and a frequency converter for down-conversion, etc. Among them, the third receiving channel 13 uses a high-gain amplifier, and the fourth receiving channel 14 uses a low-gain amplifier. Of course, the third receiving channel 13 and the fourth receiving channel 14 may also use other components capable of performing gain, filtering, and down-conversion processing on echo signals. Amplifiers, filters, frequency converters, etc. are all well-known components to those skilled in the art, and the present disclosure will not elaborate on them here.

[0051] Due to the gain compression principle of the amplifier, the gain multiple of the third receiving channel 13 is relatively high. When a relatively strong echo signal enters the third receiving channel 13, it causes the amplifier to saturate, resulting in distortion of the strong echo signal. When a relatively weak echo signal enters the fourth receiving channel 14, the gain can reach within the linear dynamic range of the radar receiving system after passing through the gain. Therefore, among the third echo intermediate frequency signals processed by the third receiving channel 13, the intermediate frequency signals of weak echoes are selected.

[0052] The gain multiple of the fourth receiving channel 14 is relatively low. When a relatively strong echo signal enters the fourth receiving channel 14, it can reach the linear dynamic range of the radar receiving system after gain. When some relatively weak echo signals enter the fourth receiving channel 14, they can also reach the linear dynamic range of the radar receiving system. Among the fourth echo intermediate-frequency signals processed by the fourth receiving channel 14, the intermediate-frequency signals of strong echoes are selected.

[0053] In a specific embodiment of the present disclosure, as Figure 2 , Figure 3 shown, the multi-channel radar receiving system further includes a second amplifier 104. The vertical channel 102 is connected to the third receiving channel 13 and the fourth receiving channel 14 through the second amplifier 104. The vertical channel 102 outputs the vertical echo signal to the second amplifier 104. The second amplifier 104 divides the vertical echo signal into a third echo signal and a fourth echo signal, and outputs the third echo signal to the third receiving channel 13 and the horizontal fourth echo signal to the fourth receiving channel 14. The third echo intermediate-frequency signal output by the third receiving channel 13 and the fourth echo intermediate-frequency signal output by the fourth receiving channel 14 are both intermediate-frequency signals of the vertical echo.

[0054] In a specific embodiment of the present disclosure, both the first amplifier 103 and the second amplifier 104 can adopt low-noise amplifiers to reduce the interference of the noise of the amplifier itself on the echo signal and improve the sensitivity of the multi-channel radar receiving system.

[0055] In an embodiment of the present disclosure, as Figure 2 , Figure 3 shown, the data processing unit includes a first data processing device 21, a second data processing device 22, a third data processing device 23, and a fourth data processing device 24. Among them, the first data processing device 21 is connected to the first receiving channel 11, and is used to receive the first echo intermediate-frequency signal and perform analog-to-digital conversion on the first echo intermediate-frequency signal. The second data processing device 22 is connected to the second receiving channel 12, and is used to receive the second echo intermediate-frequency signal and perform analog-to-digital conversion on the second echo intermediate-frequency signal. The third data processing device 23 is connected to the third receiving channel 13, and is used to receive the third echo intermediate-frequency signal and perform analog-to-digital conversion on the third echo intermediate-frequency signal. The fourth data processing device 24 is connected to the fourth receiving channel 14, and is used to receive the fourth echo intermediate-frequency signal and perform analog-to-digital conversion on the fourth echo intermediate-frequency signal.

[0056] The first data processing device 21 and the second data processing device 22 perform calibration and synthesis on the intermediate-frequency signals obtained by each of them, and finally obtain the data signal of the horizontal channel 101. The third data processing device 23 and the fourth data processing device 24 perform calibration and synthesis on the intermediate-frequency signals obtained by each of them, and obtain the data signal of the vertical channel 102.

[0057] The first echo intermediate-frequency signal is transmitted to the analog-to-digital converter of the first data processing device 21 for analog-to-digital conversion, and the second echo intermediate-frequency signal is transmitted to the analog-to-digital converter of the second data processing device 22 for analog-to-digital conversion. The analog-to-digital converters of the first data processing device 21 and the second data processing device 22 collect data, perform in-phase quadrature transformation and sampling low-pass filtering processing, filter out signals with frequencies exceeding the set critical value, and then convert them into amplitude (Amplitude) and phase (Phase) data in the form of I (in-phase) and Q (quadrature) data. After calibration and synthesis, the overall data signal of the horizontal channel is obtained.

[0058] The third echo intermediate-frequency signal is transmitted to the analog-to-digital converter of the third data processing device 23 for analog-to-digital conversion, and the fourth echo intermediate-frequency signal is transmitted to the analog-to-digital converter of the fourth data processing device 24 for analog-to-digital conversion. The analog-to-digital converters of the third data processing device 23 and the fourth data processing device 24 collect data, perform in-phase quadrature transformation and sampling low-pass filtering processing, filter out signals with frequencies exceeding the set critical value, and then convert them into amplitude (Amplitude) and phase (Phase) data in the form of I (in-phase) and Q (quadrature) data. After calibration and synthesis, the overall data signal of the vertical channel is obtained.

[0059] In the multi-channel radar receiving system of the present disclosure, through the four-channel receiving system of the first receiving channel 11, the second receiving channel 12, the third receiving channel 13, and the fourth receiving channel 14, the reception of strong echo signals and weak echo signals is realized, and the linear dynamic range of the dual-polarization radar receiver is broadened.

[0060] During the operation of the radar, the horizontal echo signals received by the antenna are respectively sent to the first receiving channel 11 and the second receiving channel 12 of the multi-channel radar receiving system through the horizontal channel, and the received vertical echo signals are respectively sent to the third receiving channel 13 and the fourth receiving channel 14 through the vertical channel. The first receiving channel 11 is a receiving channel with a low noise figure and high gain, and performs gain, filtering, and down-conversion processing on the received weak horizontal echo signal to obtain the first echo intermediate-frequency signal. The second receiving channel 12 is a channel with low gain and high compression point, and performs gain, filtering, and down-conversion processing on the received strong horizontal echo signal to obtain the second echo intermediate-frequency signal. The third receiving channel 13 is a receiving channel with a low noise figure and high gain, and performs gain, filtering, and down-conversion processing on the received weak vertical echo signal to obtain the third echo intermediate-frequency signal. The fourth receiving channel 14 is a channel with low gain and high compression point, and performs gain, filtering, and down-conversion processing on the received strong vertical echo signal to obtain the fourth echo intermediate-frequency signal.

[0061] The first data processing device 21 receives the first echo intermediate frequency signal and performs analog-to-digital conversion. The second data processing device 22 receives the second echo intermediate frequency signal and performs analog-to-digital conversion. After the analog-to-digital conversion of the first echo intermediate frequency signal and the second echo intermediate frequency signal, calibration and synthesis are performed to obtain the overall data signal of the horizontal channel. The third data processing device 23 receives the third echo intermediate frequency signal and performs analog-to-digital conversion. The fourth data processing device 24 receives the fourth echo intermediate frequency signal and performs analog-to-digital conversion. After the analog-to-digital conversion of the third echo intermediate frequency signal and the fourth echo intermediate frequency signal, calibration and synthesis are performed to obtain the overall data signal of the vertical channel.

[0062] The data processing unit can finally obtain the data of strong horizontal echo signals, weak horizontal echo signals, strong vertical echo signals and weak vertical echo signals, greatly improving the linear dynamic range of the weather radar receiver and realizing the improvement of the radar's ability to receive strong and weak echo signals.

[0063] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A multi-channel radar receiving system, characterized in that: include: An echo receiving channel, the echo receiving channel comprising a first receiving channel (11) and a second receiving channel (12); The first receiving channel (11) amplifies the received first echo signal and processes the amplified first echo signal into a first echo intermediate frequency signal; the second receiving channel (12) amplifies the received second echo signal and processes the amplified second echo signal into a second echo intermediate frequency signal; wherein the intensity of the first echo signal is less than a threshold value, and the intensity of the second echo signal is greater than the threshold value; The echo receiving channel further includes a third receiving channel (13) and a fourth receiving channel (14); the third receiving channel (13) performs a gain on the received third echo signal and processes the gained third echo signal into a third echo intermediate frequency signal; the fourth receiving channel (14) performs a gain on the received fourth echo signal and processes the gained fourth echo signal into a fourth echo intermediate frequency signal; wherein the intensity of the third echo signal is less than a threshold value, and the intensity of the fourth echo signal is greater than the threshold value; a horizontal channel (101) and a first amplifier (103), wherein the horizontal channel (101) is used to receive a horizontal echo signal, and output the received horizontal echo signal to a first receiving channel (11) and a second receiving channel (12) respectively through the first amplifier (103); a vertical channel (102) and a second amplifier (104), wherein the vertical channel (102) is used to receive a vertical echo signal, and output the received vertical echo signal to a third receiving channel (13) and a fourth receiving channel (14) respectively through the second amplifier (104); A data processing unit, wherein the data processing unit is configured to perform in-phase orthogonal transformation on the received first echo intermediate frequency signal and the second echo intermediate frequency signal to obtain amplitude and phase data; the data processing unit is also configured to perform in-phase orthogonal transformation on the received third echo intermediate frequency signal and the fourth echo intermediate frequency signal to obtain amplitude and phase data.

2. The multi-channel radar receiving system according to claim 1, characterized in that: The first receiving channel (11) is a high-gain receiving channel, and the second receiving channel (12) is a low-gain receiving channel.

3. The multi-channel radar receiving system according to claim 1, characterized in that: The first receiving channel (11) is used for filtering and down-converting a received first echo signal into a first echo intermediate frequency signal; the second receiving channel (12) is used for filtering and down-converting a received second echo signal into a second echo intermediate frequency signal.

4. The multi-channel radar receiving system according to claim 1, characterized in that: The first amplifier (103) and the second amplifier (104) are low noise amplifiers.

5. The multi-channel radar receiving system according to claim 1, characterized in that: The first receiving channel (11) is a high-gain receiving channel, and the second receiving channel (12) is a low-gain receiving channel; The third receiving channel (13) is used to filter and down-convert the received third echo signal into a third echo intermediate frequency signal; the fourth receiving channel (14) is used to filter and down-convert the received strong echo signal into a fourth echo intermediate frequency signal.

6. The multi-channel radar receiving system according to claim 1, characterized in that: The data processing unit comprises: a first data processing device (21) for performing analog-to-digital conversion on the first echo intermediate frequency signal, a second data processing device (22) for performing analog-to-digital conversion on the second echo intermediate frequency signal, a third data processing device (23) for performing analog-to-digital conversion on the third echo intermediate frequency signal, and a fourth data processing device (24) for performing analog-to-digital conversion on the fourth echo intermediate frequency signal.

7. The multi-channel radar receiving system according to claim 6, characterized in that: The first data processing device (21) and the second data processing device (22) perform correction and synthesis on the intermediate frequency signals obtained by each of them to obtain the data signal of the horizontal channel (101); the third data processing device (23) and the fourth data processing device (24) perform correction and synthesis on the intermediate frequency signals obtained by each of them to obtain the data signal of the vertical channel (102).

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