Millimeter wave external calibration source

Abstract

The utility model relates to a millimeter wave external calibration source, and relates to the technical field of radars. Comprising a local oscillator frequency source (1), an intermediate frequency source (2), a W-band frequency doubling chain (3), an intermediate frequency processing module (4) and a control unit (5), the local oscillation frequency source (1) generates a local oscillation dot frequency signal and inputs the local oscillation dot frequency signal into the W-band frequency multiplication chain (3); the intermediate frequency source (2) generates an intermediate frequency signal and inputs the intermediate frequency signal into the intermediate frequency processing module (4); the W-band frequency multiplication chain (3) is connected with the intermediate frequency processing module (4); the control unit (5) is connected with the local oscillator frequency source (1), the intermediate frequency source (2), the W-band frequency multiplication chain (3) and the intermediate frequency processing module (4). According to the utility model, a sub-function module and step-by-step attenuation control mode is adopted, the output of any waveform and noise source can be realized, and the device has the advantages of large attenuation dynamic range, low stray and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of radar, in particular to a millimeter wave external calibration source. Background Art

[0002] The calibration source is a signal source with a certain power output. The signal can be a single-frequency source, a sweep source, a linear frequency modulation line, or a noise source. It is used to remotely calibrate the radar receiver, the amplitude characteristics, phase characteristics, and temperature drift of the receiver receiving channel, and plays an important role in the radar receiver system. For the W band (75GHz~110GHz), the realization of the calibration source is somewhat difficult, mainly reflected in the generation of high-frequency signals, the arbitrariness of waveforms, the control of amplitude, and the generation of power.

[0003] The commonly used calibration sources in the W band all adopt the frequency doubling method. According to the frequency doubling theory, the phase noise will deteriorate by 20*log10(N), where N is the frequency doubling number. And because of the frequency doubling, the frequency step increases. To achieve the same frequency step in the W band, the step of the local oscillator source will be smaller, which leads to an increase in the complexity of the local oscillator source and an increase in spurious. And the frequency doubling method is difficult to achieve the calibration source and noise source of arbitrary waveforms. Utility Model Content

[0004] In order to solve the above-mentioned problems of the prior art and realize the output of arbitrary waveforms and noise sources, a W-band calibration source is realized in the form of mixing. A fixed point frequency source is used to drive the local oscillator frequency multiplication chain, and then the small-step intermediate frequency signal is moved to the W band by mixing. In this way, the deterioration of phase noise and spurious signals can be avoided, and the output of arbitrary waveforms can be realized. The utility model provides a millimeter-wave external calibration source.

[0005] A millimeter wave external calibration source comprises a local oscillator frequency source, an intermediate frequency frequency source, a W-band frequency multiplication chain, an intermediate frequency processing module and a control unit; the local oscillator frequency source generates a local oscillator point frequency signal which is input into the W-band frequency multiplication chain; the intermediate frequency frequency source generates an intermediate frequency signal which is input into the intermediate frequency processing module; the W-band frequency multiplication chain is connected to the intermediate frequency processing module; the control unit is connected to the local oscillator frequency source, the intermediate frequency frequency source, the W-band frequency multiplication chain and the intermediate frequency processing module.

[0006] Furthermore, the W-band frequency multiplication chain includes a first input end W-band quadrupler, a W-band local oscillator filter, a W-band mixer, a W-band amplifier, a W-band filter, a first attenuation amplification module, a second attenuation amplification module and a waveguide connected in sequence; the first input end is connected to a local oscillator frequency source.

[0007] Furthermore, the W-band mixer is connected to a second input terminal and a voltage regulating terminal; and the second input terminal is connected to an intermediate frequency processing module.

[0008] Furthermore, the intermediate frequency processing module includes an intermediate frequency input terminal, a first intermediate frequency amplifier, a first digitally controlled attenuator, a second intermediate frequency amplifier, a second digitally controlled attenuator, an intermediate frequency filter and an intermediate frequency output terminal which are connected in sequence; the intermediate frequency output terminal is connected to a W-band mixer.

[0009] Furthermore, the first attenuation and amplification module and the second attenuation and amplification module each include a signal input terminal, an attenuator, an isolation belt, an amplifier and a signal output terminal which are connected in sequence.

[0010] Furthermore, the local oscillator frequency signal generated by the local oscillator frequency source is 10.5 GHz.

[0011] Furthermore, the intermediate frequency signal generated by the intermediate frequency source is 8 GHz to 12 GHz.

[0012] The beneficial effects of the utility model are as follows: the utility model adopts a sub-functional module and a step-by-step attenuation control method to realize the output of arbitrary waveforms and noise sources, and realizes functional modes such as point frequency, sweep frequency, and noise on a set of calibration sources, and has the advantages of a large attenuation dynamic range and low spurious. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0014] Figure 2 This is the structure diagram of the W-band frequency doubling chain;

[0015] Figure 3 This is the structure diagram of the intermediate frequency processing module;

[0016] Figure 4 This is the structural diagram of the attenuation amplifier module;

[0017] Description of the drawings: 1. Local oscillator frequency source; 2. Intermediate frequency source; 3. W-band frequency multiplication chain; 4. Intermediate frequency processing module; 5. Control unit; 10. First input terminal; 11. W-band quadrupler; 12. W-band local oscillator filter; 13. W-band mixer; 14. Second input terminal; 15. Voltage regulation terminal; 16. W-band amplifier; 17. W-band filter; 18. First attenuation amplification module; 19. Second attenuation amplification module; 20. Waveguide; 21. Isolation plate; 30. Signal input terminal; 31. Attenuator; 32. Isolation belt; 33. Amplifier; 34. Signal output terminal; 40. Intermediate frequency input terminal; 41. First intermediate frequency amplifier; 42. First digitally controlled attenuator; 43. Second intermediate frequency amplifier; 44. Second digitally controlled attenuator; 45. Intermediate frequency filter; 46. Intermediate frequency output terminal. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In this embodiment, refer to Figure 1 As shown, a millimeter-wave external calibration source includes a local oscillator frequency source 1, an intermediate frequency frequency source 2, a W-band frequency multiplication chain 3, an intermediate frequency processing module 4 and a control unit 5; the local oscillator frequency source 1 generates a local oscillator point frequency signal which is input into the W-band frequency multiplication chain 3; the intermediate frequency frequency source 2 generates an intermediate frequency signal which is input into the intermediate frequency processing module 4; the W-band frequency multiplication chain 3 is connected to the intermediate frequency processing module 4; the control unit 5 is connected to the local oscillator frequency source 1, the intermediate frequency frequency source 2, the W-band frequency multiplication chain 3 and the intermediate frequency processing module 4.

[0020] In this embodiment, if Figure 2 As shown, the W-band frequency multiplication chain 3 includes a first input terminal 10, a W-band quadrupler 11, a W-band local oscillator filter 12, a W-band mixer 13, a W-band amplifier 16, a W-band filter 17, a first attenuation amplification module 18, a second attenuation amplification module 19 and a waveguide 20 connected in sequence; the first input terminal is connected to the local oscillator frequency source 1.

[0021] The W-band mixer 13 is connected to a second input terminal 14 and a voltage regulating terminal 15; the second input terminal 14 is connected to the intermediate frequency processing module 4. The W-band frequency multiplication chain 3 is provided with an isolation plate 21 on one side of the second input terminal 14.

[0022] The local oscillator frequency source 1 generates a 10.5 GHz local oscillator frequency signal, which is input to the first input terminal 10 of the W-band frequency multiplication chain 3. The signal passes through the W-band quadrupler 11 to generate an 84 GHz intermediate frequency signal. The signal passes through the W-band local oscillator filter 12 to filter out the harmonics generated by the W-band quadrupler 11, and retains the 4th harmonic to be input to the W-band mixer 13.

[0023] In this embodiment, if Figure 3 As shown, the intermediate frequency processing module 4 includes an intermediate frequency input terminal 40, a first intermediate frequency amplifier 41, a first digitally controlled attenuator 42, a second intermediate frequency amplifier 43, a second digitally controlled attenuator 44, an intermediate frequency filter 45 and an intermediate frequency output terminal 46 which are connected in sequence; the intermediate frequency output terminal 46 is connected to the W-band mixer 13.

[0024] The intermediate frequency source 2 generates an intermediate frequency signal of 8 to 12 GHz, which is amplified and filtered by the intermediate frequency processing module 4. The detailed internal signal flow is as follows: after the signal enters the intermediate frequency input terminal 40, it is amplified by the first intermediate frequency amplifier 41, then digitally attenuated by the first digital attenuator 42, then amplified by the second intermediate frequency amplifier 43, further attenuated by the second digital attenuator 44, and finally filtered by the intermediate frequency filter 45 and output from the intermediate frequency output terminal 46 to complete the processing of the intermediate frequency signal. When the intermediate frequency signal is generated from the intermediate frequency source 2, the digitally controlled attenuators 42 and 44 attenuate the intermediate frequency signal; when the intermediate frequency signal is noise, the noise will be attenuated to complete the control of the intermediate frequency signal.

[0025] The signal output from the intermediate frequency output terminal 46 is fed to the W-band mixer 13 and mixed with the local oscillator signal. The mixing gain is adjusted by the voltage adjustment terminal 15 through the voltage to generate a W-band RF signal. The signal is amplified by the W-band amplifier 16 and enters the W-band filter 17 for filtering to filter out all signals except the upper sideband. The signal further enters the W-band first attenuation amplifier module 18 and the second attenuation amplifier module 19 to further control the amplitude of the signal, and is finally output through the waveguide 20.

[0026] In this embodiment, if Figure 4 As shown, the first attenuation and amplification module 18 and the second attenuation and amplification module 19 each include a signal input terminal 30, an attenuator 31, an isolation zone 32, an amplifier 33 and a signal output terminal 34 which are connected in sequence.

[0027] In order to effectively attenuate the W-band signal and avoid insufficient output power adjustment range due to leakage, a two-stage attenuation + amplification method is used instead of a multi-stage amplification followed by attenuation. The first attenuation amplification module and the second attenuation amplification module 19 of the W-band attenuation + amplification are internally composed of an attenuator 31 and an amplifier 33, and a waveguide is used in the middle to form a first-level isolation zone 32 to achieve isolation of the two-stage chips, and the positions of the two are staggered to ensure that RF leakage does not affect the attenuation range, while controlling the gain of each stage of amplification to ensure that each stage of amplification can be effectively attenuated, thereby avoiding leakage problems caused by excessive gain.

[0028] When the output power needs to be adjusted, first adjust the electrically adjustable attenuator inside the second attenuation amplifier module 19, and after the electrically adjustable attenuator is adjusted to the maximum attenuation value, about 20dB, adjust the electrically adjustable attenuator inside the first attenuation amplifier module 18; when the electrically adjustable attenuator inside the module 18 is also attenuated to 20dB, and the total attenuation is 40dB, use the first digital controlled attenuator 42 and the second digital controlled attenuator 44 inside the intermediate frequency processing module 4 to adjust simultaneously, so that for the attenuation under the signal, the total attenuation can be attenuated to about 100dB, and the adjustment under large dynamics will be achieved, and the dynamic range will not be reached due to problems such as RF leakage. If the noise mode is to be output, it is only necessary to turn off the output signal of the intermediate frequency source 1, and the above-mentioned attenuation method is also used for adjustment. Since the amplification link is only about 60dB, the attenuation dynamic is 60dB for the signal. If you want to further increase the dynamic range under the noise mode, you only need to add an intermediate frequency processing module.

[0029] In the description of the embodiments of the present utility model, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0030] In the description of the embodiments of the present utility model, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0033] In the description of the embodiments of the present utility model, it should be understood that "-" and "~" represent the range between two values, and the range includes the endpoints. For example: "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0034] In the description of the embodiments of the present utility model, the term "and / or" herein is only a kind of association relationship of describing the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A millimeter wave external calibration source, characterized in that: The invention comprises a local oscillator frequency source (1), an intermediate frequency source (2), a W-band frequency multiplication chain (3), an intermediate frequency processing module (4) and a control unit (5); the local oscillator frequency source (1) generates a local oscillator frequency signal which is input into the W-band frequency multiplication chain (3); the intermediate frequency source (2) generates an intermediate frequency signal which is input into the intermediate frequency processing module (4); the W-band frequency multiplication chain (3) is connected to the intermediate frequency processing module (4); and the control unit (5) is connected to the local oscillator frequency source (1), the intermediate frequency source (2), the W-band frequency multiplication chain (3) and the intermediate frequency processing module (4).

2. A millimeter wave external calibration source according to claim 1, characterized in that: The W-band frequency multiplication chain (3) comprises a first input end (10), a W-band quadrupler (11), a W-band local oscillator filter (12), a W-band mixer (13), a W-band amplifier (16), a W-band filter (17), a first attenuation amplification module (18), a second attenuation amplification module (19) and a waveguide (20) which are connected in sequence; the first input end is connected to a local oscillator frequency source (1).

3. A millimeter wave external calibration source according to claim 2, characterized in that: The W-band mixer (13) is connected to a second input terminal (14) and a voltage regulating terminal (15); the second input terminal (14) is connected to an intermediate frequency processing module (4).

4. A millimeter wave external calibration source according to claim 2, characterized in that: The intermediate frequency processing module (4) comprises an intermediate frequency input terminal (40), a first intermediate frequency amplifier (41), a first digitally controlled attenuator (42), a second intermediate frequency amplifier (43), a second digitally controlled attenuator (44), an intermediate frequency filter (45) and an intermediate frequency output terminal (46) which are connected in sequence; the intermediate frequency output terminal (46) is connected to a W-band mixer (13).

5. The millimeter wave external calibration source according to claim 2, characterized in that: The first attenuation and amplification module (18) and the second attenuation and amplification module (19) both comprise a signal input end (30), an attenuator (31), an isolation band (32), an amplifier (33), and a signal output end (34) which are connected in sequence.

6. The millimeter wave external calibration source according to claim 1, characterized in that: The local oscillator frequency source (1) generates a local oscillator frequency signal of 10.5 GHz.

7. The millimeter wave external calibration source according to claim 1, characterized in that: The intermediate frequency source (2) generates an intermediate frequency signal of 8 GHz to 12 GHz.

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