CN109120291B - Three-channel variable frequency receiving assembly - Google Patents
Three-channel variable frequency receiving assembly Download PDFInfo
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- CN109120291B CN109120291B CN201710485331.2A CN201710485331A CN109120291B CN 109120291 B CN109120291 B CN 109120291B CN 201710485331 A CN201710485331 A CN 201710485331A CN 109120291 B CN109120291 B CN 109120291B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- Superheterodyne Receivers (AREA)
Abstract
The invention discloses a three-channel variable frequency receiving component, which comprises: limiter A (1), limiter B (2), limiter C (3), single-pole double-throw switch A (4), single-pole double-throw switch B (5), single-pole double-throw switch C (6), low noise are put A (7), B (8) are put to the low noise, C (9) are put to the low noise, microwave filter A (10), still include: vector modulator a (16), vector modulator B (17), and vector modulator C (18). The invention can accurately adjust the signal amplitude and phase of the receiving channel by using the digital vector modulator, and solves the problem of poor amplitude-phase consistency between channels of the traditional frequency conversion receiving component.
Description
Technical Field
The invention relates to a receiving assembly, in particular to a three-channel variable-frequency receiving assembly.
Background
The traditional three-channel frequency conversion receiving assembly consists of multistage functional devices such as an amplitude limiter, a microwave switch, a low-noise amplifier, a mixer, a filter, an attenuator and an amplifier, wherein the three receiving channels have certain amplitude-phase inconsistency due to the difference of the devices and the difference introduced in the assembly process, the circuit is lack of devices capable of accurately adjusting the amplitude and the phase of signals, and the amplitude-phase consistency among the channels is poor.
Disclosure of Invention
The invention aims to provide a three-channel frequency conversion receiving assembly with high gain, large dynamic range and high amplitude-phase consistency among channels, and solves the problem of poor amplitude-phase consistency among channels of the traditional three-channel frequency conversion receiving assembly.
A three-channel variable frequency receive assembly comprising: limiter A, limiter B, limiter C, single-pole double-throw switch A, single-pole double-throw switch B, single-pole double-throw switch C, low-noise amplifier A, low-noise amplifier B, low-noise amplifier C, microwave filter A, microwave filter B, microwave filter C, numerical control attenuator A, numerical control attenuator B, numerical control attenuator C, mixer A, mixer B, mixer C, intermediate frequency amplifier A, intermediate frequency amplifier B, intermediate frequency amplifier C, numerical control attenuator D, numerical control attenuator E, numerical control attenuator F, intermediate frequency filter A, intermediate frequency filter B, intermediate frequency filter C, intermediate frequency amplifier D, intermediate frequency amplifier E, intermediate frequency amplifier F, numerical control attenuator G, numerical control attenuator H, numerical control attenuator I, intermediate frequency amplifier G, intermediate frequency amplifier H, intermediate frequency amplifier I, intermediate frequency filter D, intermediate frequency filter E, intermediate frequency filter F, Calibration signal source and local oscillator signal source still include: vector modulator a, vector modulator B and vector modulator C.
The input ends of the amplitude limiter A, the amplitude limiter B and the amplitude limiter C are three input ends of a frequency conversion receiving component, the output ends of the amplitude limiter A, the amplitude limiter B and the amplitude limiter C are respectively connected with a switch branch I of a single-pole double-throw switch A, a single-pole double-throw switch B and a single-pole double-throw switch C, a switch branch II of the single-pole double-throw switch A, the single-pole double-throw switch B and the single-pole double-throw switch C is connected with a calibration signal source, the common ends of the single-pole double-throw switch A, the single-pole double-throw switch B and the single-pole double-throw switch C are respectively connected with the input ends of a low-noise amplifier A, a low-noise amplifier B and a low-noise amplifier C, the output ends of the low-noise amplifier A, the low-noise amplifier B and the low-noise amplifier C are respectively connected with the input ends of a microwave filter A, a microwave filter B and a microwave filter C, the output ends of the microwave filter A, the microwave filter B and, the output ends of the numerical control attenuator A, the numerical control attenuator B and the numerical control attenuator C are respectively connected with the input ends of the vector modulator A, the vector modulator B and the vector modulator C, the output ends of the vector modulator A, the vector modulator B and the vector modulator C are respectively connected with the radio frequency input ends of the mixer A, the mixer B and the mixer C, the local oscillation ends of the mixer A, the mixer B and the mixer C are connected with a local oscillation signal source, the intermediate frequency output ends of the mixer A, the mixer B and the mixer C are respectively connected with the input ends of the intermediate frequency amplifier A, the intermediate frequency amplifier B and the intermediate frequency amplifier C, the output ends of the intermediate frequency amplifier A, the intermediate frequency amplifier B and the intermediate frequency amplifier C are respectively connected with the input ends of the numerical control attenuator D, the numerical control attenuator E and the numerical control attenuator F, and the output ends of the numerical control attenuator D, the numerical control attenuator E and the, The output ends of the intermediate frequency filter A, the intermediate frequency filter B and the intermediate frequency filter C are respectively connected with the input ends of an intermediate frequency amplifier D, an intermediate frequency amplifier E and an intermediate frequency amplifier F, the output ends of the intermediate frequency amplifier D, the intermediate frequency amplifier E and the intermediate frequency amplifier F are respectively connected with the input ends of a numerical control attenuator G, a numerical control attenuator H and a numerical control attenuator I, the numerical control attenuator G, the output ends of the numerical control attenuator H and the numerical control attenuator I are respectively connected with the input ends of the intermediate frequency amplifier G, the intermediate frequency amplifier H and the intermediate frequency amplifier I, the output ends of the intermediate frequency amplifier G, the intermediate frequency amplifier H and the intermediate frequency amplifier I are respectively connected with the input ends of the intermediate frequency filter D, the intermediate frequency filter E and the intermediate frequency filter F, and the output ends of the intermediate frequency filter D, the intermediate frequency filter E and the intermediate frequency filter F are three output ends of the frequency conversion receiving component.
The three-channel frequency conversion receiving assembly is divided into a receiving working mode and a calibrating working mode, a calibrating signal source is closed when the receiving working mode works, a single-pole double-throw switch A, a single-pole double-throw switch B and a single-pole double-throw switch C are all connected with a switch branch I, three input signals from an antenna enter a receiving channel through an amplitude limiter A, an amplitude limiter B and an amplitude limiter C respectively, and are transmitted to the single-pole double-throw switch A, the single-pole double-throw switch B and the single-pole double-throw switch C respectively after amplitude limiting; when the calibration mode works, a calibration signal source is turned on, the single-pole double-throw switch A, the single-pole double-throw switch B and the single-pole double-throw switch C are all connected with the switch branch II, and calibration signals respectively enter a receiving channel through the single-pole double-throw switch A, the single-pole double-throw switch B and the single-pole double-throw switch C. For the first path of receiving channel, a single-pole double-throw switch A selects to receive an input signal or a calibration signal, then the selected signal is transmitted to a low-noise amplifier A, and the low-noise amplifier A performs low-noise amplification; the amplified signal is filtered by a microwave filter A, attenuated by a numerical control attenuator A, subjected to amplitude-phase adjustment by a vector modulator A and then transmitted to a mixer A for frequency mixing; the local oscillation signal required by the frequency mixer A is provided by a local oscillation signal source; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier A, then attenuated by a numerical control attenuator D, filtered by an intermediate frequency filter A, further amplified by the intermediate frequency amplifier D, attenuated by a numerical control attenuator G, further amplified by the intermediate frequency amplifier G, and finally filtered and output by the intermediate frequency filter D. For the second receiving channel, the single-pole double-throw switch B selectively receives an input signal or a calibration signal, then the selected signal is transmitted to the low-noise amplifier B, and the low-noise amplifier B performs low-noise amplification; the amplified signal is filtered by a microwave filter B, attenuated by a numerical control attenuator B, subjected to amplitude and phase adjustment by a vector modulator B, and transmitted to a mixer B for frequency mixing; the local oscillation signal required by the frequency mixer B is provided by a local oscillation signal source; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier B, then attenuated by a numerical control attenuator E, filtered by an intermediate frequency filter B, further amplified by the intermediate frequency amplifier E, attenuated by a numerical control attenuator H, further amplified by the intermediate frequency amplifier H, and finally filtered and output by the intermediate frequency filter E. For the third receiving channel, a single-pole double-throw switch C selects to receive an input signal or a calibration signal, then the selected signal is transmitted to a low-noise amplifier C, and the low-noise amplifier C performs low-noise amplification; the amplified signal is filtered by a microwave filter C, attenuated by a numerical control attenuator C, subjected to amplitude and phase adjustment by a vector modulator C, and transmitted to a mixer C for frequency mixing; the local oscillation signal required by the mixer C is provided by a local oscillation signal source; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier C, then attenuated by a numerical control attenuator F, filtered by an intermediate frequency filter C, further amplified by the intermediate frequency amplifier F, attenuated by a numerical control attenuator I, further amplified by the intermediate frequency amplifier I, filtered by the intermediate frequency filter F and output.
The four-stage amplifier in the channel enables the channel to have receiving gain as high as 80dB, the three-stage numerical control attenuator enables the channel to have an automatic gain control range of 80dB, and the vector modulator enables the channel to have an accurate amplitude and phase adjusting function. The invention has the advantages of high gain, large dynamic range, high amplitude-phase consistency among channels and the like.
Drawings
Fig. 1 is a schematic structural diagram of a three-channel variable frequency receiving assembly.
1. Amplitude limiter A2, amplitude limiter B3, amplitude limiter C4, single-pole double-throw switch A5, single-pole double-throw switch B
6. Single-pole double-throw switch C7, low-noise amplifier A8, low-noise amplifier B9, low-noise amplifier C10, microwave filter A
11. Microwave filter B12, microwave filter C13, numerical control attenuator A14 and numerical control attenuator B
15. Numerical control attenuator C16, vector modulator A17, vector modulator B18, vector modulator C19 and mixer A
20. Mixer B21, mixer C22, IF amplifier A23, IF amplifier B24, IF amplifier C
25. Numerical control attenuator D26, numerical control attenuator E27, numerical control attenuator F28 and intermediate frequency filter A
29. IF filter B30, IF filter C31, IF amplifier D32, IF amplifier E
33. Intermediate frequency amplifier F34, numerical control attenuator G35, numerical control attenuator H36, numerical control attenuator I37 and intermediate frequency amplifier G
38. IF amplifier H39, IF amplifier I40, IF filter D41, IF filter E
42. An intermediate frequency filter F43, a calibration signal source 44, a local oscillator signal source.
Detailed Description
A three-channel variable frequency receive assembly comprising: limiter A, limiter B, limiter C, single-pole double-throw switch A, single-pole double-throw switch B, single-pole double-throw switch C, low-noise amplifier A, low-noise amplifier B, low-noise amplifier C, microwave filter A, microwave filter B, microwave filter C, numerical control attenuator A, numerical control attenuator B, numerical control attenuator C, mixer A, mixer B, mixer C, intermediate frequency amplifier A, intermediate frequency amplifier B, intermediate frequency amplifier C, numerical control attenuator D, numerical control attenuator E, numerical control attenuator F, intermediate frequency filter A, intermediate frequency filter B, intermediate frequency filter C, intermediate frequency amplifier D, intermediate frequency amplifier E, intermediate frequency amplifier F, numerical control attenuator G, numerical control attenuator H, numerical control attenuator I, intermediate frequency amplifier G, intermediate frequency amplifier H, intermediate frequency amplifier I, intermediate frequency filter D, intermediate frequency filter E, intermediate frequency filter F, The calibration signal source 43 and the local oscillator signal source 44 further include: vector modulator a16, vector modulator B17, and vector modulator C18.
The input ends of an amplitude limiter A1, an amplitude limiter B2 and an amplitude limiter C3 are three input ends of a frequency conversion receiving component, the output ends of the amplitude limiter A1, the amplitude limiter B2 and the amplitude limiter C3 are respectively connected with a switch branch I of a single-pole double-throw switch A4, a single-pole double-throw switch B5 and a single-pole double-throw switch C6, the switch branches II of the single-pole double-throw switch A4, the single-pole double-throw switch B5 and the single-pole double-throw switch C6 are respectively connected with an input end of a low-noise amplifier A7, a low-noise amplifier B7 and a low-noise amplifier C7, the output ends of the low-noise amplifier A7, the low-noise amplifier B7 and the low-noise amplifier C7 are respectively connected with the input ends of a microwave filter A7, a microwave filter B7 and a microwave filter C7, and the output end of the microwave filter A7 and the microwave attenuator C7 are respectively connected with the input end of the microwave filter 7, The output ends of the numerical control attenuator B14 and the numerical control attenuator C15 are respectively connected with the input ends of a vector modulator A16, a vector modulator B17 and a vector modulator C15, the output ends of the vector modulator A13, the numerical control attenuator B14 and the numerical control attenuator C15 are respectively connected with the input ends of a vector modulator A16, a vector modulator B17 and a vector modulator C18, the output ends of the vector modulator A16, the vector modulator B17 and the vector modulator C17 are respectively connected with the radio frequency input ends of a mixer A17, a mixer B17 and a mixer C17, the local oscillation ends of the mixer A17, the mixer B17 and the mixer C17 are respectively connected with the input ends of an intermediate frequency amplifier A17, an intermediate frequency amplifier B17 and an intermediate frequency amplifier C17, the output ends of the intermediate frequency amplifier A17, the intermediate frequency amplifier B17 and the intermediate frequency amplifier C17 are respectively connected with the input ends of a numerical control attenuator D17, a numerical control attenuator E17 and a numerical control attenuator C17, and D17, The output ends of the numerical control attenuator E26 and the numerical control attenuator F27 are respectively connected with the input ends of an intermediate frequency filter A28, an intermediate frequency filter B29 and an intermediate frequency filter C30, the output ends of an intermediate frequency filter A28, an intermediate frequency filter B29 and an intermediate frequency filter C30 are respectively connected with the input ends of an intermediate frequency amplifier D31, an intermediate frequency amplifier E32 and an intermediate frequency amplifier F33, the output ends of an intermediate frequency amplifier D31, an intermediate frequency amplifier E32 and an intermediate frequency amplifier F32 are respectively connected with the input ends of a numerical control attenuator G32, a numerical control attenuator H32 and a numerical control I32, the output ends of a numerical control attenuator G32, a numerical control attenuator H32 and a numerical control I32 are respectively connected with the input ends of an intermediate frequency amplifier G32, an intermediate frequency amplifier H32 and an intermediate frequency amplifier I32, the output ends of the numerical control amplifier G32, the intermediate frequency amplifier H32 and the intermediate frequency amplifier I32 are respectively, the output ends of the intermediate frequency filter D40, the intermediate frequency filter E41 and the intermediate frequency filter F42 are three output ends of the frequency conversion receiving component.
The three-channel frequency conversion receiving assembly is divided into two working modes of receiving and calibrating, when the receiving mode works, a calibration signal source 43 is closed, a single-pole double-throw switch A4, a single-pole double-throw switch B5 and a single-pole double-throw switch C6 are all connected with a switch branch I, three paths of input signals from an antenna enter a receiving channel through an amplitude limiter A1, an amplitude limiter B2 and an amplitude limiter C3 respectively, and are transmitted to a single-pole double-throw switch A4, a single-pole double-throw switch B5 and a single-pole double-throw switch C6 respectively after amplitude limiting; when the calibration mode works, the calibration signal source 43 is turned on, the single-pole double-throw switch A4, the single-pole double-throw switch B5 and the single-pole double-throw switch C6 are all connected with the switch branch II, and calibration signals respectively enter a receiving channel through the single-pole double-throw switch A4, the single-pole double-throw switch B5 and the single-pole double-throw switch C6. For the first path of receiving channel, the single-pole double-throw switch A4 selects to receive the input signal or the calibration signal, then the selected signal is transmitted to the low-noise amplifier A7, and the low-noise amplifier A7 performs low-noise amplification; the amplified signal is filtered by a microwave filter A10, attenuated by a numerical control attenuator A13, subjected to amplitude-phase adjustment by a vector modulator A16 and then transmitted to a mixer A19 for frequency mixing; the local oscillator signal required by the mixer a19 is provided by the local oscillator signal source 44; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier A22, then attenuated by a numerical control attenuator D25, filtered by an intermediate frequency filter A28, further amplified by an intermediate frequency amplifier D31, attenuated by a numerical control attenuator G34, further amplified by an intermediate frequency amplifier G37, and finally filtered by an intermediate frequency filter D40 and output. For the second receiving channel, the single-pole double-throw switch B5 selects to receive the input signal or the calibration signal, then the selected signal is transmitted to the low-noise amplifier B8, and the low-noise amplifier B8 performs low-noise amplification; the amplified signal is filtered by a microwave filter B11, attenuated by a numerical control attenuator B14, subjected to amplitude-phase adjustment by a vector modulator B17 and then transmitted to a mixer B20 for frequency mixing; the local oscillator signal required by the mixer B20 is provided by the local oscillator signal source 44; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier B23, then attenuated by a numerical control attenuator E26, filtered by an intermediate frequency filter B29, further amplified by an intermediate frequency amplifier E32, attenuated by a numerical control attenuator H35, further amplified by an intermediate frequency amplifier H38, and finally filtered and output by an intermediate frequency filter E41. For the third receiving channel, the single-pole double-throw switch C6 selects to receive the input signal or the calibration signal, then the selected signal is transmitted to the low-noise amplifier C9, and the low-noise amplifier C9 performs low-noise amplification; the amplified signal is filtered by a microwave filter C12, attenuated by a numerical control attenuator C15, subjected to amplitude-phase adjustment by a vector modulator C18 and then transmitted to a mixer C21 for frequency mixing; the local oscillator signal required by the mixer C21 is provided by the local oscillator signal source 44; the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier C24, then attenuated by a numerical control attenuator F27, filtered by an intermediate frequency filter C30, further amplified by an intermediate frequency amplifier F33, attenuated by a numerical control attenuator I36, further amplified by an intermediate frequency amplifier I39, and finally filtered and output by an intermediate frequency filter F42.
Claims (2)
1. A three-channel variable frequency receive assembly comprising: amplitude limiter A (1), amplitude limiter B (2), amplitude limiter C (3), single-pole double-throw switch A (4), single-pole double-throw switch B (5), single-pole double-throw switch C (6), low-noise amplifier A (7), low-noise amplifier B (8), low-noise amplifier C (9), microwave filter A (10), microwave filter B (11), microwave filter C (12), numerical control attenuator A (13), numerical control attenuator B (14), numerical control attenuator C (15), mixer A (19), mixer B (20), mixer C (21), intermediate frequency amplifier A (22), intermediate frequency amplifier B (23), intermediate frequency amplifier C (24), numerical control attenuator D (25), numerical control attenuator E (26), numerical control attenuator F (27), intermediate frequency filter A (28), intermediate frequency filter B (29), intermediate frequency filter C (30), intermediate frequency amplifier D (31), Intermediate frequency amplifier E (32), intermediate frequency amplifier F (33), numerical control attenuator G (34), numerical control attenuator H (35), numerical control attenuator I (36), intermediate frequency amplifier G (37), intermediate frequency amplifier H (38), intermediate frequency amplifier I (39), intermediate frequency filter D (40), intermediate frequency filter E (41), intermediate frequency filter F (42), calibration signal source (43) and local oscillator signal source (44), its characterized in that still includes: a vector modulator A (16), a vector modulator B (17), and a vector modulator C (18);
the input ends of the amplitude limiter A (1), the amplitude limiter B (2) and the amplitude limiter C (3) are three input ends of a frequency conversion receiving assembly, the output ends of the amplitude limiter A (1), the amplitude limiter B (2) and the amplitude limiter C (3) are respectively connected with switch branches I of a single-pole double-throw switch A (4), a single-pole double-throw switch B (5) and a single-pole double-throw switch C (6), switch branches II of the single-pole double-throw switch A (4), the single-pole double-throw switch B (5) and the single-pole double-throw switch C (6) are connected with a calibration signal source (43), common ends of the single-pole double-throw switch A (4), the single-pole double-throw switch B (5) and the single-pole double-throw switch C (6) are respectively connected with input ends of a low-noise amplifier A (7), a low-noise amplifier B (8) and a low-noise amplifier C (9), and output ends of the low-noise amplifier A (7), the low-noise amplifier B (8) and the low-noise amplifier C (9) are respectively connected with, The output ends of the microwave filter B (11) and the microwave filter C (12) are respectively connected with the input ends of a numerical control attenuator A (13), a numerical control attenuator B (14) and a numerical control attenuator C (15), the output ends of the numerical control attenuator A (13), the numerical control attenuator B (14) and the numerical control attenuator C (15) are respectively connected with the input ends of a vector modulator A (16), a vector modulator B (17) and a vector modulator C (18), the output ends of the vector modulator A (16), the vector modulator B (17) and the vector modulator C (18) are respectively connected with the radio frequency input ends of a mixer A (19), a mixer B (20) and a mixer C (21), the local oscillation ends of the mixer A (19), the mixer B (20) and the mixer C (21) are connected with a local oscillation signal source (44), the intermediate frequency output ends of the mixer A (19), the mixer B (20) and the mixer C (21) are respectively connected with the input ends of an intermediate frequency amplifier A (22), an intermediate frequency amplifier B (23) and an intermediate frequency amplifier C (24), the output ends of the intermediate frequency amplifier A (22), the intermediate frequency amplifier B (23) and the intermediate frequency amplifier C (24) are respectively connected with the input ends of a numerical control attenuator D (25), a numerical control attenuator E (26) and a numerical control attenuator F (27), the output ends of the numerical control attenuator D (25), the numerical control attenuator E (26) and the numerical control attenuator F (27) are respectively connected with the input ends of an intermediate frequency filter A (28), an intermediate frequency filter B (29) and an intermediate frequency filter C (30), the output ends of the intermediate frequency filter A (28), the intermediate frequency filter B (29) and the intermediate frequency filter C (30) are respectively connected with the intermediate frequency amplifier D (, The output ends of the intermediate frequency amplifier G (37), the intermediate frequency amplifier H (38) and the intermediate frequency amplifier I (39) are respectively connected with the input ends of the intermediate frequency filter D (40), the intermediate frequency filter E (41) and the intermediate frequency filter F (42), and the output ends of the intermediate frequency filter D (40), the intermediate frequency filter E (41) and the intermediate frequency filter F (42) are three output ends of a variable frequency receiving component.
2. The three-channel frequency conversion receiving assembly of claim 1, wherein the three-channel frequency conversion receiving assembly works in the following steps: the three-channel frequency conversion receiving assembly is divided into a receiving working mode and a calibrating working mode, a calibrating signal source (43) is turned off when the receiving mode works, a single-pole double-throw switch A (4), a single-pole double-throw switch B (5) and a single-pole double-throw switch C (6) are all connected with a switch branch I, three input signals from an antenna respectively enter a receiving channel through an amplitude limiter A (1), an amplitude limiter B (2) and an amplitude limiter C (3), and are respectively transmitted to the single-pole double-throw switch A (4), the single-pole double-throw switch B (5) and the single-pole double-throw switch C (6) after amplitude limiting; when the calibration mode works, a calibration signal source (43) is turned on, a single-pole double-throw switch A (4), a single-pole double-throw switch B (5) and a single-pole double-throw switch C (6) are all connected with a switch branch II, and calibration signals respectively enter a receiving channel through the single-pole double-throw switch A (4), the single-pole double-throw switch B (5) and the single-pole double-throw switch C (6); for a first path of receiving channel, a single-pole double-throw switch A (4) selects to receive an input signal or a calibration signal, then the selected signal is transmitted to a low-noise amplifier A (7), and the low-noise amplifier A (7) performs low-noise amplification; the amplified signal is filtered by a microwave filter A (10), attenuated by a numerical control attenuator A (13), subjected to amplitude and phase adjustment by a vector modulator A (16), and transmitted to a mixer A (19) for mixing; the local oscillation signal required by the mixer A (19) is provided by a local oscillation signal source (44); amplifying the mixed intermediate frequency signal by an intermediate frequency amplifier A (22), attenuating by a numerical control attenuator D (25), filtering by an intermediate frequency filter A (28), further amplifying by an intermediate frequency amplifier D (31), attenuating by a numerical control attenuator G (34), further amplifying by an intermediate frequency amplifier G (37), filtering by an intermediate frequency filter D (40) and outputting; for the second receiving channel, a single-pole double-throw switch B (5) selects to receive an input signal or a calibration signal, then the selected signal is transmitted to a low-noise amplifier B (8), and the low-noise amplifier B (8) performs low-noise amplification; the amplified signal is filtered by a microwave filter B (11), attenuated by a numerical control attenuator B (14), subjected to amplitude and phase adjustment by a vector modulator B (17), and transmitted to a mixer B (20) for mixing; the local oscillation signal required by the mixer B (20) is provided by a local oscillation signal source (44); amplifying the mixed intermediate frequency signal by an intermediate frequency amplifier B (23), attenuating by a numerical control attenuator E (26), filtering by an intermediate frequency filter B (29), further amplifying by an intermediate frequency amplifier E (32), attenuating by a numerical control attenuator H (35), further amplifying by an intermediate frequency amplifier H (38), filtering by an intermediate frequency filter E (41) and outputting; for the third receiving channel, a single-pole double-throw switch C (6) selects to receive an input signal or a calibration signal, then the selected signal is transmitted to a low-noise amplifier C (9), and the low-noise amplifier C (9) performs low-noise amplification; the amplified signal is filtered by a microwave filter C (12), attenuated by a numerical control attenuator C (15), subjected to amplitude and phase adjustment by a vector modulator C (18), and transmitted to a mixer C (21) for frequency mixing; the local oscillation signal required by the mixer C (21) is provided by a local oscillation signal source (44); the mixed intermediate frequency signal is firstly amplified by an intermediate frequency amplifier C (24), then attenuated by a numerical control attenuator F (27), filtered by an intermediate frequency filter C (30), further amplified by an intermediate frequency amplifier F (33), attenuated by a numerical control attenuator I (36), further amplified by an intermediate frequency amplifier I (39), and finally filtered and output by an intermediate frequency filter F (42).
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