Millimeter wave transceiver signal processing device and security inspection equipment

Abstract

The present invention is applicable to the field of millimeter wave technology and provides a millimeter wave transceiver signal processing device and security inspection equipment. The millimeter wave transceiver signal processing device includes: a source signal generation module, a first frequency mixing module, a second frequency mixing module, a local oscillator signal module, a millimeter wave transmitting module, and a millimeter wave receiving module. The source signal generation module is connected to the first frequency mixing module and the second frequency mixing module, respectively. The first frequency mixing module is connected to the millimeter wave transmitting module, and the second frequency mixing module is connected to the millimeter wave receiving module. The first and second frequency mixing modules are also connected to the local oscillator signal module, which is also connected to the millimeter wave receiving module. The millimeter wave transceiver signal processing device of the present invention is small in size and low in cost.

Description

Technical Field

[0001] The present invention belongs to the field of millimeter wave technology, and in particular relates to a millimeter wave transceiver signal processing device and security inspection equipment. Background Art

[0002] Active millimeter wave imaging technology is widely used in various security inspection equipment due to its advantages such as good three-dimensional imaging effect and no damage to the human body.

[0003] As the core component of active millimeter-wave imaging equipment, millimeter-wave transceiver signal processing devices have long been a research hotspot in active millimeter-wave imaging technology. The inventors of this application discovered that existing millimeter-wave transceiver signal processing devices require two independent signal sources: one for generating the millimeter-wave transmit signal for the millimeter-wave transmitting unit, and the other for generating the local oscillator signal for the millimeter-wave receiving unit. This dual-signal source structure results in large size and high cost for existing millimeter-wave transceiver signal processing devices. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a millimeter wave transceiver signal processing device and security inspection equipment to solve the problems of large size and high cost of millimeter wave transceiver signal processing devices in the prior art.

[0005] A first aspect of an embodiment of the present invention provides a millimeter wave transceiver signal processing device, including:

[0006] Source signal generating module, first frequency mixing module, second frequency mixing module, local oscillator signal module, millimeter wave transmitting module and millimeter wave receiving module;

[0007] The first output end of the source signal generating module is connected to the first input end of the first frequency mixing module, and the output end of the first frequency mixing module is connected to the input end of the millimeter wave transmitting module; the second output end of the source signal generating module is connected to the first input end of the second frequency mixing module, and the output end of the second frequency mixing module is connected to the first input end of the millimeter wave receiving module;

[0008] The first output end of the local oscillator signal module is connected to the second input end of the first mixing module, the second output end of the local oscillator signal module is connected to the second input end of the second mixing module, and the third output end of the local oscillator signal module is connected to the second input end of the millimeter wave receiving module.

[0009] Optionally, the source signal generation module includes:

[0010] Clock reference unit, direct digital frequency synthesizer, quadruple frequency multiplier, bandpass filter and power divider;

[0011] The clock reference unit, the direct digital frequency synthesizer, the quadrupler, the bandpass filter, and the power divider are connected in sequence. The first output end of the power divider is connected to the first input end of the first mixing module as the first output end of the source signal generating module, and the second output end of the power divider is connected to the first input end of the second mixing module as the second output end of the source signal generating module.

[0012] Optionally, the first mixing module includes:

[0013] Transmit mixer and transmit 12-frequency multiplier;

[0014] The first input end of the transmitting mixer is connected to the first output end of the source signal generating module, the second input end of the transmitting mixer is connected to the first output end of the local oscillator signal module, the output end of the transmitting mixer is connected to the input end of the transmitting 12-frequency multiplier, and the output end of the transmitting 12-frequency multiplier is connected to the input end of the millimeter wave transmitting module.

[0015] Optionally, the second mixing module includes:

[0016] Receive mixer and receive 12-frequency multiplier;

[0017] The first input end of the receiving mixer is connected to the second output end of the source signal generating module, the second input end of the receiving mixer is connected to the second output end of the local oscillator signal module, the output end of the receiving mixer is connected to the input end of the receiving 12-multiplier, and the output end of the receiving 12-multiplier is connected to the first input end of the millimeter wave receiving module.

[0018] Optionally, the local oscillator signal module includes:

[0019] a first local oscillator unit, a second local oscillator unit, and a local oscillator mixer;

[0020] The first output end of the first local oscillator unit is connected to the second input end of the first frequency mixing module, and the second output end of the first local oscillator unit is connected to the first input end of the local oscillator mixer;

[0021] The first output end of the second local oscillator unit is connected to the second input end of the second frequency mixing module, and the second output end of the second local oscillator unit is connected to the second input end of the local oscillator mixer;

[0022] The output end of the local oscillator mixer is connected to the second input end of the millimeter wave receiving module.

[0023] Optionally, the millimeter wave transmission module includes:

[0024] millimeter-wave filters and power amplifiers;

[0025] The input end of the millimeter wave filter is connected to the output end of the first frequency mixing module, the output end of the millimeter wave filter is connected to the input end of the power amplifier, and the output end of the power amplifier is used to connect to an external transmitting antenna.

[0026] Optionally, the millimeter wave receiving module includes:

[0027] Double-balanced mixer, signal pre-processing unit, IQ demodulator, differential amplifier and local oscillator frequency multiplication filter unit;

[0028] The first input end of the double-balanced mixer is connected to the output end of the second mixing module, the second input end of the double-balanced mixer is used to connect to an external receiving antenna, and the output end of the double-balanced mixer is connected to the input end of the signal preprocessing unit;

[0029] The output end of the signal preprocessing unit is connected to the first input end of the IQ demodulator, the output end of the IQ demodulator is connected to the input end of the differential amplifier, and the output end of the differential amplifier is used to connect to an external millimeter wave imaging module;

[0030] The input end of the local oscillator frequency multiplication filter unit is connected to the third output end of the local oscillator signal module, and the output end of the local oscillator frequency multiplication filter unit is connected to the second input end of the IQ demodulator.

[0031] Optionally, the signal preprocessing unit includes:

[0032] SAW filters, signal amplifiers and digitally controlled attenuators;

[0033] The input end of the surface acoustic wave filter is connected to the output end of the double-balanced mixer, and the output end of the surface acoustic wave filter is connected to the input end of the signal amplifier;

[0034] The output end of the signal amplifier is connected to the input end of the digitally controlled attenuator, and the output end of the digitally controlled attenuator is connected to the first input end of the IQ demodulator.

[0035] Optionally, the millimeter wave transceiver signal processing device further includes:

[0036] Timing control module;

[0037] The timing control module is connected to the timing control terminal of the source signal generation module and the timing control terminal of the local oscillation signal module respectively, and is used to control the timing of the source signal generation module and the local oscillation signal module.

[0038] A second aspect of the embodiments of the present invention provides a security inspection device, which includes a millimeter wave imaging module, a transmitting antenna, a receiving antenna, and a millimeter wave transceiver signal processing device as provided in the first aspect of the embodiments of the present invention;

[0039] The transmitting signal output end of the millimeter wave transceiver signal processing device is connected to the transmitting antenna, the receiving signal input end of the millimeter wave transceiver signal processing device is connected to the receiving antenna, and the receiving signal output end of the millimeter wave transceiver signal processing device is connected to the millimeter wave imaging module.

[0040] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0041] The present invention connects a source signal generation module to two different frequency mixing modules. After the signal generated by the source signal generation module undergoes two different frequency mixing steps, one signal is input as a millimeter-wave transmission signal to the millimeter-wave transmission module, and the other signal is input as a receiving local oscillator signal to the millimeter-wave receiving module. This allows the use of a single source signal generation module to generate the different Ka-band signals required by the millimeter-wave transmission and reception modules. The millimeter-wave transceiver signal processing device of the present invention utilizes only a single signal source, significantly reducing the size of the millimeter-wave transceiver signal processing device and lowering its production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 1 is a schematic diagram of the overall structure of a millimeter wave transceiver signal processing device provided by an embodiment of the present invention;

[0044] Figure 2 It is a schematic diagram of the detailed structure of the millimeter wave transceiver signal processing device and the security inspection equipment provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0045] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0046] In order to illustrate the technical solution of the present invention, specific embodiments are provided below.

[0047] A first aspect of an embodiment of the present invention provides a millimeter wave transceiver signal processing device, such as Figure 1 As shown, the millimeter wave transceiver signal processing device 10 includes:

[0048] Source signal generating module 11, first frequency mixing module 12, second frequency mixing module 13, local oscillator signal module 14, millimeter wave transmitting module 15 and millimeter wave receiving module 16;

[0049] The first output end of the source signal generating module 11 is connected to the first input end of the first frequency mixing module 12, and the output end of the first frequency mixing module 12 is connected to the input end of the millimeter wave transmitting module 15; the second output end of the source signal generating module 11 is connected to the first input end of the second frequency mixing module 13, and the output end of the second frequency mixing module 13 is connected to the first input end of the millimeter wave receiving module 16;

[0050] The first output end of the local oscillator signal module 14 is connected to the second input end of the first mixing module 12, the second output end of the local oscillator signal module 14 is connected to the second input end of the second mixing module 13, and the third output end of the local oscillator signal module 14 is connected to the second input end of the millimeter wave receiving module 16.

[0051] In an embodiment of the present invention, by connecting the source signal generating module 11 with the first mixing module 12 and the second mixing module 13, the signal generated by the source signal generating module 11 undergoes two different mixing processes, one of which is input into the millimeter wave transmitting module 15 as a millimeter wave transmitting signal, and the other is input into the millimeter wave receiving module 16 as a receiving local oscillator signal, thereby achieving the use of the same source signal generating module 11 to obtain different Ka-band signals required by the millimeter wave transmitting module 15 and the millimeter wave receiving module 16.

[0052] In order to more clearly describe the technical solution of the present invention, the following Figure 2 The detailed structure of the millimeter wave transceiver signal processing device provided in an embodiment of the present invention is described.

[0053] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the source signal generating module 11 may include:

[0054] A clock reference unit 111 , a direct digital frequency synthesizer 112 , a quadruple frequency multiplier 113 , a bandpass filter 114 and a power divider 115 .

[0055] The clock reference unit 111, the direct digital frequency synthesizer 112, the quadrupler 113, the bandpass filter 114, and the power divider 115 are connected in sequence. The first output end of the power divider 115 is connected to the first input end of the first mixing module 12 as the first output end of the source signal generating module 11, and the second output end of the power divider 115 is connected to the first input end of the second mixing module 13 as the second output end of the source signal generating module 11.

[0056] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the first mixing module 12 includes:

[0057] Transmit mixer 121 and transmit 12-multiplier 122 .

[0058] The first input end of the transmitting mixer 121 is connected to the first output end of the source signal generating module 11, the second input end of the transmitting mixer 121 is connected to the first output end of the local oscillator signal module 14, the output end of the transmitting mixer 121 is connected to the input end of the transmitting 12-frequency multiplier 122, and the output end of the transmitting 12-frequency multiplier 122 is connected to the input end of the millimeter wave transmitting module 15.

[0059] The bandwidth of millimeter-wave transmission signals is a key factor affecting the resolution and imaging quality of security inspection equipment. A higher signal bandwidth improves the imaging quality of security inspection equipment, thereby increasing its resolution. Currently, the bandwidth of millimeter-wave transmission signals output by commercially available millimeter-wave transceiver signal processing devices is 6 GHz or even narrower, which has certain detection limitations.

[0060] In an embodiment of the present invention, the clock reference unit 111 is an S-band reference clock. The clock reference unit 111 drives the direct digital frequency synthesizer 112 to generate a linear frequency modulation signal of 475-675 MHz. The linear frequency modulation signal passes through the 4-multiplier 113 and the bandpass filter 114 to obtain a linear frequency modulation signal of 1.9-2.7 GHz, which is input into the power divider 115. The power divider 115 divides the linear frequency modulation signal into two outputs, one of which is input into the first mixing module 12. After mixing and 12-multiplication processing, a linear frequency modulation signal with a frequency of 33.6 to 43.2 GHz can be obtained. The signal bandwidth is 9.6 GHz, realizing broadband output of the millimeter wave transmission signal, and the signal scanning time is on the order of ns.

[0061] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the second mixing module 13 includes:

[0062] A receiving mixer 131 and a receiving 12-multiplier 132 .

[0063] The first input end of the receiving mixer 131 is connected to the second output end of the source signal generating module 11, the second input end of the receiving mixer 131 is connected to the second output end of the local oscillator signal module 14, the output end of the receiving mixer 131 is connected to the input end of the receiving 12-frequency multiplier 132, and the output end of the receiving 12-frequency multiplier 132 is connected to the first input end of the millimeter wave receiving module 16.

[0064] In an embodiment of the present invention, another linear frequency modulation signal output by the power divider 115 is input into the second mixing module 13. After mixing and frequency multiplication, a linear frequency modulation signal of the frequency required by the millimeter wave receiving module 16 is obtained as the receiving local oscillator signal of the millimeter wave receiving module 16.

[0065] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the local oscillator signal module 14 includes:

[0066] A first local oscillator unit 141 , a second local oscillator unit 142 and a local oscillator mixer 143 .

[0067] A first output terminal of the first local oscillator unit 141 is connected to a second input terminal of the first frequency mixing module 12 , and a second output terminal of the first local oscillator unit 141 is connected to a first input terminal of the local oscillator mixer 143 .

[0068] A first output terminal of the second local oscillator unit 142 is connected to a second input terminal of the second frequency mixing module 13 , and a second output terminal of the second local oscillator unit 142 is connected to a second input terminal of the local oscillator mixer 143 .

[0069] An output terminal of the local oscillator mixer 143 is connected to a second input terminal of the millimeter wave receiving module 16 .

[0070] In an embodiment of the present invention, the local oscillator signal module 14 is provided with two local oscillator units, which generate local oscillator signals of different frequencies. The local oscillator signal generated by the first local oscillator unit 141 is input into the first frequency mixing module 12, mixed with a linear frequency modulation signal output by the power divider 115, and frequency multiplied to obtain a millimeter wave transmission signal. The local oscillator signal generated by the second local oscillator unit 142 is input into the second frequency mixing module 13, mixed with another linear frequency modulation signal output by the power divider 115, and frequency multiplied to obtain a reception local oscillator signal. This realizes the use of one source signal to obtain different Ka-band signals required by the millimeter wave transmission module 15 and the millimeter wave receiving module 16.

[0071] In an embodiment of the present invention, the local oscillator signal generated by the first local oscillator unit 141 and the local oscillator signal generated by the second local oscillator unit 142 are mixed in the local oscillator mixer 143 to obtain a 10 MHz intermediate frequency signal. The intermediate frequency signal can be used as the input signal of the local oscillator frequency multiplication filter unit 165 of the millimeter wave receiving module 16. Through this design, there is no need to configure a local oscillator unit separately for the local oscillator frequency multiplication filter unit 165, which further reduces the volume and cost of the millimeter wave transceiver signal processing device 10.

[0072] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the millimeter wave transmitting module 15 includes:

[0073] Millimeter wave filter 151 and power amplifier 152.

[0074] The input end of the millimeter wave filter 151 is connected to the output end of the first frequency mixing module 12 . The output end of the millimeter wave filter 151 is connected to the input end of the power amplifier 152 . The output end of the power amplifier 152 is used to connect to an external transmitting antenna.

[0075] In the embodiment of the present invention, the millimeter wave transmission signal is input into the millimeter wave transmission module 15, and after filtering and power amplification, it is transmitted by the external transmission antenna. Specifically, the millimeter wave filter is a substrate integrated waveguide (SIW) filter.

[0076] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the millimeter wave receiving module 16 includes:

[0077] A double-balanced mixer 161 , a signal pre-processing unit 162 , an IQ demodulator 163 , a differential amplifier 164 and a local oscillator frequency multiplication and filtering unit 165 .

[0078] A first input of the double-balanced mixer 161 is connected to the output of the second mixing module 13 , a second input of the double-balanced mixer 161 is connected to an external receiving antenna, and an output of the double-balanced mixer 161 is connected to the input of the signal preprocessing unit 162 .

[0079] The output end of the signal preprocessing unit 162 is connected to the first input end of the IQ demodulator 163 . The output end of the IQ demodulator 163 is connected to the input end of the differential amplifier 164 . The output end of the differential amplifier 164 is used to connect to an external millimeter wave imaging module.

[0080] An input end of the local oscillator frequency multiplication filter unit 165 is connected to the third output end of the local oscillator signal module 14 , and an output end of the local oscillator frequency multiplication filter unit 165 is connected to the second input end of the IQ demodulator 163 .

[0081] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the signal preprocessing unit 162 includes:

[0082] SAW filter 1621 , signal amplifier 1622 and digitally controlled attenuator 1623 .

[0083] An input end of the SAW filter 1621 is connected to an output end of the double-balanced mixer 161 , and an output end of the SAW filter 1621 is connected to an input end of the signal amplifier 1622 .

[0084] The output end of the signal amplifier 1622 is connected to the input end of the digitally controlled attenuator 1623 , and the output end of the digitally controlled attenuator 1623 is connected to the first input end of the IQ demodulator 163 .

[0085] In an embodiment of the present invention, the double-balanced mixer 161 mixes the echo signal received by the receiving antenna and the received local oscillator signal to obtain a first-stage intermediate frequency signal Fif1. The first-stage intermediate frequency signal Fif1 is passed through the surface acoustic wave filter 1621, the signal amplifier 1622, and the digitally controlled attenuator 1623 to achieve large dynamic range and high gain of the signal. The first-stage intermediate frequency signal Fif1 is then input into the IQ demodulator 163 for mixing with the signal output by the local oscillator frequency multiplication filter unit 165, and then passed through the differential amplifier 164 to obtain the second-stage differential intermediate frequency signal Fif2. Finally, the second-stage differential intermediate frequency signal Fif2 is input into the external millimeter wave imaging module for subsequent imaging processing.

[0086] Optionally, as a specific implementation of the millimeter wave transceiver signal processing device 10 provided in the first aspect of the embodiment of the present invention, the millimeter wave transceiver signal processing device 10 further includes:

[0087] Timing control module 17.

[0088] The timing control module 17 is connected to the timing control terminal of the source signal generating module 11 and the timing control terminal of the local oscillator signal module 14 respectively, and is used to control the timing of the source signal generating module 11 and the local oscillator signal module 14 .

[0089] Specifically, in this embodiment of the present invention, the timing control module 17 is used to control the signal generation timing of the direct frequency digital synthesizer 112, the first local oscillator unit 141, and the second local oscillator unit 142. Furthermore, in this embodiment of the present invention, the clock reference unit 111, the first local oscillator unit 141, and the second local oscillator unit 142 are based on the same reference source, which, in conjunction with the timing control module 17, achieves phase coherence of the various signals, thereby ensuring phase stability of the millimeter-wave transceiver signal processing device 10.

[0090] A second aspect of the embodiment of the present invention provides a security inspection device, such as Figure 2 As shown, the security inspection equipment includes a millimeter wave imaging module 21, a transmitting antenna 22, a receiving antenna 23 and a millimeter wave transceiver signal processing device 10 as provided in the first aspect of the embodiment of the present invention.

[0091] The transmitting signal output end of the millimeter wave transceiver signal processing device 10 is connected to the transmitting antenna 21 , the receiving signal input end of the millimeter wave transceiver signal processing device 10 is connected to the receiving antenna 22 , and the receiving signal output end of the millimeter wave transceiver signal processing device 10 is connected to the millimeter wave imaging module 23 .

[0092] As can be seen from the above, the present invention connects the source signal generating module 11 to two different frequency mixing modules. After the signal generated by the source signal generating module 11 undergoes two different frequency mixing, one signal is input as a millimeter wave transmission signal to the millimeter wave transmitting module 15, and the other signal is input as a receiving local oscillator signal to the millimeter wave receiving module 16. This achieves the use of the same source signal generating module 11 to obtain the different Ka-band signals required by the millimeter wave transmitting module 15 and the millimeter wave receiving module 16. The millimeter wave transceiver signal processing device 10 can output a millimeter wave transmission signal with a bandwidth of 9.6 GHz, thereby improving the resolution of the security inspection equipment. By mixing the local oscillator signals generated by the first local oscillator unit 141 and the second local oscillator unit 142 and inputting them into the local oscillator frequency multiplication filter unit 165, the size and cost of the millimeter wave transceiver signal processing device 10 are further reduced. The millimeter wave transceiver signal processing device of the present invention has the advantages of small size and low cost.

[0093] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A millimeter wave transceiver signal processing device, characterized in that: include: Source signal generating module, first frequency mixing module, second frequency mixing module, local oscillator signal module, millimeter wave transmitting module and millimeter wave receiving module; The first output end of the source signal generating module is connected to the first input end of the first frequency mixing module, and the output end of the first frequency mixing module is connected to the input end of the millimeter wave transmitting module; the second output end of the source signal generating module is connected to the first input end of the second frequency mixing module, and the output end of the second frequency mixing module is connected to the first input end of the millimeter wave receiving module; The first output end of the local oscillator signal module is connected to the second input end of the first frequency mixing module, the second output end of the local oscillator signal module is connected to the second input end of the second frequency mixing module, and the third output end of the local oscillator signal module is connected to the second input end of the millimeter wave receiving module; The source signal generating module comprises: Clock reference unit, direct digital frequency synthesizer, quadruple frequency multiplier, bandpass filter and power divider; The clock reference unit, direct digital frequency synthesizer, quadrupler, bandpass filter, and power divider are connected in sequence, a first output end of the power divider is connected to the first input end of the first frequency mixing module as the first output end of the source signal generating module, and a second output end of the power divider is connected to the first input end of the second frequency mixing module as the second output end of the source signal generating module; The first frequency mixing module includes: Transmit mixer and transmit 12-frequency multiplier; The first input end of the transmitting mixer is connected to the first output end of the source signal generating module, the second input end of the transmitting mixer is connected to the first output end of the local oscillator signal module, the output end of the transmitting mixer is connected to the input end of the transmitting 12-frequency multiplier, and the output end of the transmitting 12-frequency multiplier is connected to the input end of the millimeter wave transmitting module; The clock reference unit is an S-band reference clock. The clock reference unit drives a direct digital frequency synthesizer to generate a 475-675MHz linear frequency modulation signal. After the linear frequency modulation signal passes through a 4-multiplier and a bandpass filter, it obtains a 1.9-2.7GHz linear frequency modulation signal, which is input into a power divider. The power divider divides the linear frequency modulation signal into two outputs. One of the linear frequency modulation signals is input into the first mixing module. After mixing and 12-multiplication, a linear frequency modulation signal with a frequency of 33.6 to 43.2GHz is obtained. The local oscillator signal module includes: a first local oscillator unit, a second local oscillator unit, and a local oscillator mixer; The first output end of the first local oscillator unit is connected to the second input end of the first frequency mixing module, and the second output end of the first local oscillator unit is connected to the first input end of the local oscillator mixer; The first output end of the second local oscillator unit is connected to the second input end of the second frequency mixing module, and the second output end of the second local oscillator unit is connected to the second input end of the local oscillator mixer; The output end of the local oscillator mixer is connected to the second input end of the millimeter wave receiving module.

2. The millimeter wave transceiver signal processing device according to claim 1, wherein: The second frequency mixing module includes: Receive mixer and receive 12-frequency multiplier; The first input end of the receiving mixer is connected to the second output end of the source signal generating module, the second input end of the receiving mixer is connected to the second output end of the local oscillator signal module, the output end of the receiving mixer is connected to the input end of the receiving 12-frequency multiplier, and the output end of the receiving 12-frequency multiplier is connected to the first input end of the millimeter wave receiving module.

3. The millimeter wave transceiver signal processing device according to claim 1, wherein: The millimeter wave transmitting module includes: millimeter-wave filters and power amplifiers; The input end of the millimeter wave filter is connected to the output end of the first frequency mixing module, the output end of the millimeter wave filter is connected to the input end of the power amplifier, and the output end of the power amplifier is used to connect to an external transmitting antenna.

4. The millimeter wave transceiver signal processing device according to claim 1, wherein: The millimeter wave receiving module includes: Double-balanced mixer, signal pre-processing unit, IQ demodulator, differential amplifier and local oscillator frequency multiplication filter unit; The first input end of the double-balanced mixer is connected to the output end of the second mixing module, the second input end of the double-balanced mixer is used to connect to an external receiving antenna, and the output end of the double-balanced mixer is connected to the input end of the signal preprocessing unit; The output end of the signal preprocessing unit is connected to the first input end of the IQ demodulator, the output end of the IQ demodulator is connected to the input end of the differential amplifier, and the output end of the differential amplifier is used to connect to an external millimeter wave imaging module; The input end of the local oscillator frequency doubling filter unit is connected to the third output end of the local oscillator signal module, and the output end of the local oscillator frequency doubling filter unit is connected to the second input end of the IQ demodulator.

5. The millimeter wave transceiver signal processing device according to claim 4, wherein: The signal preprocessing unit includes: SAW filters, signal amplifiers and digitally controlled attenuators; The input end of the surface acoustic wave filter is connected to the output end of the double-balanced mixer, and the output end of the surface acoustic wave filter is connected to the input end of the signal amplifier; The output end of the signal amplifier is connected to the input end of the digitally controlled attenuator, and the output end of the digitally controlled attenuator is connected to the first input end of the IQ demodulator.

6. The millimeter wave transceiver signal processing device according to any one of claims 1 to 5, wherein: Also includes: Timing control module; The timing control module is connected to the timing control terminal of the source signal generating module and the timing control terminal of the local oscillator signal module respectively, and is used to control the timing of the source signal generating module and the local oscillator signal module.

7. A security inspection device, characterized in that: It comprises a millimeter wave imaging module, a transmitting antenna, a receiving antenna, and a millimeter wave transceiver signal processing device according to any one of claims 1 to 6; The transmitting signal output end of the millimeter wave transceiver signal processing device is connected to the transmitting antenna, the receiving signal input end of the millimeter wave transceiver signal processing device is connected to the receiving antenna, and the receiving signal output end of the millimeter wave transceiver signal processing device is connected to the millimeter wave imaging module.

Images