Two-channel receiving preprocessing module

Abstract

The utility model belongs to the technical field of signal processing, and discloses a dual-channel receiving and preprocessing module, which is used for carrying out amplitude limiting, amplification and preselection filtering on signals received by an antenna and is divided into an upper channel and a lower channel which are completely identical. An upper channel and a lower channel of the module are respectively provided with a signal input port, and in a receiving mode, a signal received by an antenna passes through an external filter and a circulator and then enters the dual-channel receiving preprocessing module. In the transmitting mode, the excitation signal reaches the antenna through the circulator. Through reasonable modular design and layout, model miniaturization is achieved, the size of the module is reduced, and therefore the problem that an existing dual-channel receiving preprocessing module is large in size is solved.

Description

Technical Field

[0001] This utility model belongs to the field of signal processing technology, and specifically relates to a dual-channel receiving preprocessing module. Background Technology

[0002] An RF receiver module is a module used to receive radio frequency signals. Its functions are quite comprehensive. It can receive high-frequency signals from the air or other radio transmitting equipment, and it can also perform signal conversion. The received high-frequency signals are demodulated back into the original low-frequency signals or digital signals using internal demodulation technology, ensuring the readability and processability of the signal. Simultaneously, to improve the strength and clarity of the received signal, the RF receiver module typically includes an amplifier to amplify weak signals. Signal processing further involves filtering, noise reduction, and other steps to eliminate unwanted frequency components and interference, thereby improving signal quality.

[0003] However, the traditional dual-channel receiver preprocessing module has disadvantages such as large size and high noise figure. The large size of the model makes it inconvenient to move and makes maintenance more difficult. Utility Model Content

[0004] The purpose of this invention is to provide a dual-channel receiving preprocessing module to address the aforementioned problems, thereby improving the issues of large noise and size, as well as the difficulty in maintenance of existing dual-channel receiving preprocessing modules.

[0005] The technical solution adopted by this utility model is as follows: a dual-channel receiving preprocessing module, which is used to limit, amplify and pre-filter the signal, and output a self-test signal and a detection signal. The module is divided into an upper channel module and a lower channel module. The module has two signal input ports. When the module is in receiving mode, the signal received by the antenna passes through the external filter and circulator and then enters the dual-channel receiving preprocessing module through the signal input ports. When the module is in transmitting mode, the excitation signal reaches the antenna through the circulator.

[0006] Furthermore, the upper channel module is equipped with a first limiter, the output of the first limiter is connected to the input of the first low noise amplifier, the output of the first low noise amplifier is connected to the input of the first filter, the first filter is used to filter out spurious waves and out-of-band interference in the input signal, and the output of the first filter is connected to the first programmable attenuator.

[0007] The first programmable attenuator is connected to the first equalizer, the first equalizer is connected to the input of the first amplifier, the output of the first amplifier is connected to the third filter, the third filter is connected to the first switch, and the first switch connects to two branches, which include the first branch and the second branch.

[0008] Further, the lower channel module is provided with a second limiter, the output end of the second limiter is connected with the input end of a second low noise amplifier, the output end of the second low noise amplifier is connected with the input end of a second filter, the second filter is used for filtering out stray waves and out-of-band interference in the input signal, and the output end of the second filter is connected with a second programmable attenuator;

[0009] The second programmable attenuator is connected with a second equalizer, the input end of the second equalizer is connected with a second amplifier, and the output end of the second amplifier is connected with a fourth filter, and the fourth filter is connected with a second switch.

[0010] The second switch is connected with a branch, and the branch includes a third branch and a fourth branch.

[0011] Further, the first branch is connected with a first pi attenuator, and the signal attenuated by the first pi attenuator is connected with the input end of a radio frequency signal RF2.

[0012] The second branch is divided into a second branch A and a second branch B, the second branch A is connected with a first power divider, the output end of the first power divider is divided into two, the output end of the first power divider is respectively connected with a first attenuator and a first detection comparator, and the second branch B is connected with a load.

[0013] Further, the third branch is connected with a second pi attenuator, and the signal attenuated by the second pi attenuator is connected with the input end of a radio frequency signal RF4.

[0014] The fourth branch includes a fourth branch A and a fourth branch B, the fourth branch A is connected with a second power divider, the second power divider is respectively connected with a second attenuator and a second detection comparator, and the fourth branch B is connected with a load.

[0015] Further, the components of the upper channel module and the lower channel module are connected through glass beads.

[0016] Further, the low-frequency signal output by the double-channel receiving pre-processing module is connected with a digital processing board through a J30J series connector.

[0017] Further, the double-channel receiving pre-processing module is externally connected with the output ends of the radio frequency signals RF2 and RF4 through a radio frequency coaxial connector JSMP(M)-J.

[0018] Further, the size of the double-channel receiving pre-processing module is 70mm*35mm*14mm.

[0019] Further, the double-channel receiving pre-processing module includes a front double-layer cover plate and internal components, the double-layer cover plate includes an inner cover plate and an outer cover plate, the inner cover plate is connected with the internal components through screws, and the outer cover plate is laser welded with the inner cover plate.

[0020] Therefore, the utility model has the advantages that:

[0021] 1、Adopt double channel to signal pre -processing, make signal satisfy the condition of subsequent step, thereby improve input signal quality, reduce noise interference, and enhance signal transmission and receiving capacity.

[0022] 2、Setting limiter, filter and two stage amplifier pre -processing to electric signal, improve the quality of input signal, and reduce the interference of noise, noise figure≤1.41dB, to a certain extent, enhance the transmission and receiving capacity of signal.

[0023] 3、External input low frequency signal realizes blind insertion with digital processing board through J30J series connector, saves the internal space of module, and insulator is used in the module, thereby guarantee the airtightness of bare chip.

[0024] 4、The component parts of each module are connected through glass beads, forming stable electrical connection, this connection mode has lower insertion loss and higher reliability, can ensure the stability and integrity of signal in transmission process, and external input low frequency signal can realize blind insertion with digital processing board through connector, can improve the flexibility and convenience between connections, and can reduce the maintenance cost and maintenance difficulty of circuit to a certain extent.

[0025] 5、Through reasonable modular design and layout, realize model miniaturization, reduce the volume of module, thereby improve the problem of large volume of existing double channel receiving pre -processing module. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawings needed to be used in the embodiment, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0027] Figure 1 It is the module composition diagram of the utility model;

[0028] Figure 2 It is the double channel receiving pre -processing module structure diagram of the utility model.

[0029] Reference signs: 1, inner cover plate;2, outer cover plate;3, internal assembly. DETAILED DESCRIPTION

[0030] The utility model will be explained in detail in combination with the drawings.

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0032] As Figure 1 shown, an embodiment of the utility model is, in order to improve the quality of received signal and restrain interference, need to preprocess the electric signal, including filtering, limiting amplitude and amplification etc. operation, therefore sets up a kind of double-channel receiving preprocessing module, the double-channel receiving preprocessing module is used to limit amplitude, amplify and preselect filter to signal, and output self-check signal and detection signal, the module is equipped with two signal input ports outside, when module is in receiving mode, the signal received by antenna, after passing through the filter and circulator outside, it enters double-channel receiving preprocessing module by signal input port;When module is in transmitting mode, excitation signal reaches antenna by circulator. The module is divided into upper channel module and lower channel module, the upper channel module is used to output self-check signal, and the lower channel module is used to output detection signal;The module is equipped with two signal input ports outside, and the signal input port is used to input excitation signal of input signal into the upper channel module and lower channel module respectively;

[0033] The structure of upper channel module and lower channel module is relatively similar, simultaneously pre-processes signal, so that signal meets the condition of subsequent step, to improve the quality of input signal, reduce the interference of noise, and enhance the transmission and reception ability of signal.

[0034] The upper channel module is equipped with first limiter, radio frequency signal RF1 output end is connected with the first limiter, the first limiter output end is connected with the first low noise amplifier input end, the first low noise amplifier output end is connected with the first filter input end, and the first filter is used to filter stray wave and out-of-band interference in input signal, and the first filter output end is connected with the first program-controlled attenuator;The first program-controlled attenuator is connected with the first equalizer, the first equalizer is connected with the input end of the first amplifier, and the output end of the first amplifier is connected with the third filter, and the third filter is connected with the first switch, the first switch connects two branches, and the two branches include first branch and second branch.

[0035] The working process is as follows: the radio frequency signal is excited by the first limiter to drive the first low noise amplifier, the first low noise amplifier is the first stage amplifier, the amplified signal is filtered by the first filter to remove the stray, and then passes through a seven-bit first programmable attenuator chip, and then the flatness of the first equalizer optimization module is utilized; the signal after optimization is amplified by the first amplifier, the first amplifier is the second stage amplifier, the amplified signal is output after passing through the third filter and the first switch, and the first switch divides the upper channel module into the first branch and the second branch.

[0036] The embodiment pre-processes the electrical signal by setting the limiter, the filter and the two-stage amplifier, improves the quality of the input signal, reduces the noise interference, and enhances the transmission and reception capability of the signal to a certain extent.

[0037] The lower channel module is provided with a second limiter, the radio frequency signal RF3 output end is connected with the second limiter, the second limiter output end is connected with the second low noise amplifier input end, the second low noise amplifier output end is connected with the second filter input end, the second filter is used to filter the stray wave and the out-of-band interference in the input signal, and the second filter output end is connected with the second programmable attenuator; the second programmable attenuator is connected with the second equalizer, the second equalizer is connected with the input end of the second amplifier, the output end of the second amplifier is connected with the fourth filter, and the fourth filter is connected with the second switch; the second switch is connected with the branch, and the branch includes the third branch and the fourth branch.

[0038] The working process is as follows: the radio frequency signal is excited by the second limiter to drive the second low noise amplifier, the second low noise amplifier is the first stage amplifier, the amplified signal is filtered by the second filter to remove the stray, and then passes through a seven-bit second programmable attenuator chip, and then the flatness of the second equalizer optimization module is utilized; the signal after optimization enters the second amplifier, the second amplifier is the second stage amplifier, the amplified signal is output after passing through the fourth filter and the second switch to the power divider and the attenuator, and the second switch divides the lower channel module into the third branch and the fourth branch.

[0039] The embodiment pre-processes the electrical signal by setting the limiter, the filter and the two-stage amplifier, improves the quality of the input signal, reduces the noise interference, and enhances the transmission and reception capability of the signal to a certain extent.

[0040] The first branch is connected with a first π attenuator, and the signal is attenuated by the first π attenuator and then connected with the radio frequency signal RF2 input end; the second branch is divided into a second branch A and a second branch B, the second branch A is connected with a first power divider, the output end of the first power divider is divided into two, the output end of the first power divider is respectively connected with a first attenuator and a first detection comparator, the first detection comparator outputs an LVTTL signal to the outside of the module after detection and comparison, and the second branch B is connected with a load.

[0041] The working process is as follows:

[0042] When the module is in a receiving mode, a radio frequency signal reaches the first branch through a first switch, a first π attenuator is arranged on the first branch, the signal is attenuated again by the first π attenuator to adjust the gain, and then the signal is output through the switch, at this time, the second branch is in the state of the second branch B;

[0043] When the module is in a transmitting mode, a radio frequency signal reaches the second branch through a first limiter after being limited by the first limiter. The second branch is divided into two branches by a switch, including a second branch A and a second branch B, the second branch A is provided with a first power divider, the output end of the first power divider is respectively connected with a first attenuator and a first detection comparator, the radio frequency signal is output through the first attenuator at the same time, and an LVTTL signal is output to the outside through the first detection comparator;

[0044] The output end of the second branch B is connected with a 50Ω load.

[0045] The first switch is arranged in the embodiment, and the path of signal processing can be flexibly selected. The first π attenuator arranged on the first branch attenuates the signal again, which not only helps to reduce the strength of the signal, but also cooperates with other attenuating elements (such as other attenuators that may be encountered later) to realize more accurate signal attenuation control. The second branch A divides the signal into two paths through the first power divider, one path is output after being attenuated by the first attenuator, and the other path enters the first detection comparator, so that the system can attenuate and detect the signal at the same time, and the analysis ability of the system to the signal characteristics is enhanced. The detection comparator can extract the amplitude, phase and other information of the signal, and provide an important basis for subsequent signal processing or control;

[0046] The design of the second branch B allows the signal to be directly connected to the 50Ω load. When in the receiving mode, the second branch is connected to the 50Ω load, and the isolation degree of the signal is increased.

[0047] The whole system adopts modular design, and each part is connected and controlled by switches, attenuators and other elements, so that each part of the system is relatively independent, easy to maintain and upgrade, and meanwhile, through reasonable circuit layout and element selection, the stability and reliability of the system can be improved, and the system downtime caused by element damage or failure can be reduced.

[0048] The third branch is connected with the second pi-type attenuator, and the signal is attenuated by the second pi-type attenuator and then connected with the radio frequency signal RF4 input end; the fourth branch includes a fourth branch A and a fourth branch B, the fourth branch A is connected with the second power divider, the second power divider is connected with the second attenuator and the second detection comparator respectively, the second detection comparator is connected with the second linear variable adjustable filter input end, and the fourth branch B is connected with the load.

[0049] The working process is that the second switch connects the third branch and the fourth branch, the second pi-type attenuator is arranged on the third branch, the signal is attenuated again by the second pi-type attenuator, and the signal is output through the switch;

[0050] The fourth branch is divided into two branches by the switch, including the fourth branch A and the fourth branch B, the fourth branch A is provided with the second power divider, the output end of the second power divider is connected with the second attenuator and the second detection comparator respectively, the electric signal is output through the second attenuator and the second pi-type attenuator, and the electric signal is input into the second linear variable adjustable filter input end through the second detection comparator;

[0051] The output end of the fourth branch B is connected with the load, wherein the load can be a passive element such as resistance, inductance and capacitance.

[0052] The second switch is arranged in the embodiment, so that the system can flexibly switch the third branch and the fourth branch, and then realize different processing path selection of the signal, and the signal control capability is enhanced; the second pi-type attenuator arranged on the third branch further attenuates the signal, so that the signal strength is finely controlled, and the signal is ensured to be kept in a suitable range in the subsequent processing or transmission process, and distortion or damage caused by too strong signal is avoided; the fourth branch divides the signal into two paths through the second power divider, one path is output after attenuation by the second attenuator, and the other path is sent into the second detection comparator for signal processing, the second detection comparator can extract the amplitude, phase and other key information of the signal, and send them into the second linear variable adjustable filter for further filtering and adjustment, so as to provide more accurate and reliable data support for subsequent signal processing or control;

[0053] The fourth branch B is directly connected with the load, so that the system can adapt to different load characteristics and meet diversified application requirements, and meanwhile, by selecting a suitable load, the signal processing effect can be further optimized, and the overall performance of the system can be improved.

[0054] The whole system adopts modular design, and each part is connected and controlled through switches, attenuators and other elements. This not only facilitates the maintenance and upgrading of the system, but also helps to improve the reliability and stability of the system. The relative independence between each module reduces the risk of fault propagation, and reasonable circuit layout and component selection help to reduce the noise and interference level of the system and improve the accuracy and reliability of signal processing.

[0055] As shown in Figure 2 Each component of the upper channel module and the lower channel module is connected by a glass bead.

[0056] The glass bead connection between each component of the dual-channel receiving preprocessing module can enhance the stability of electrical connection, reduce signal attenuation and distortion during transmission, and improve the overall performance of the system. In a radio frequency system, glass bead connection can achieve effective isolation between each channel or module, prevent signal crosstalk and interference, and further improve the anti-interference ability of the system and the purity of the signal, while ensuring the air tightness of the module.

[0057] During the debugging and maintenance of the module, the detachability of the glass bead connection improves the maintainability and expandability of the module. The glass bead connection has little loss during signal transmission, which helps to maintain the integrity and strength of the signal and ensures the efficient operation of the system.

[0058] The low-frequency signal output by the dual-channel receiving preprocessing module is connected to the digital processing board through a J30J series connector.

[0059] The J30J series connector is used to transmit the low-frequency signal from the dual-channel receiving preprocessing module to the digital processing board. The connector can maintain the integrity and accuracy of the signal during transmission, reduce signal attenuation and interference, and thus improve the overall performance of the system. The J30J series is a standardized connector interface, so the module can be compatible with various types of digital processing boards and external radio frequency equipment, further enhancing the adaptability and flexibility of the system.

[0060] The dual-channel receiving preprocessing module assembly uses connector plug-in for external connection, saving space in the module. The module uses insulators inside to ensure the air tightness of the bare chip.

[0061] Blind plug design simplifies the connection process, improves installation efficiency, and reduces the risk of connection errors or damage caused by improper human operation.

[0062] The output ends of the radio frequency signals RF2 and RF4 are connected to the outside of the dual-channel receiving preprocessing module through a radio frequency coaxial connector JSMP(M)-J.

[0063] JSMP(M)-J is a standardized connector interface, thereby enhancing the adaptability and flexibility of the system; and the radio frequency coaxial connector is specially used for high frequency signals, has low loss, high shielding and stable electrical characteristics, and can ensure high quality transmission of the radio frequency signal, thereby reducing the problems of signal distortion and radiation leakage.

[0064] Another embodiment of the utility model is, the double channel receiving preprocessing module size is 70mm*35mm*14mm.

[0065] The embodiment realizes model miniaturization by reasonable modular design and layout, reduces the volume of the module, and thereby improves the problem of large volume of the existing double channel receiving preprocessing module.

[0066] The double channel receiving preprocessing module adopts a hybrid technology of bare chip and packaging, and realizes complete functions in a small volume.

[0067] As shown in Figure 2 Another embodiment of the utility model is, the double channel receiving preprocessing module includes front double layer cover plate and internal component 3, the double layer cover plate includes inner cover plate 1 and outer cover plate 2, the inner cover plate 1 is connected with internal component 3 by screw, and the outer cover plate 2 is laser welded with the inner cover plate 1.

[0068] Adopt double layer cover plate structure, ensure the stability of structure, and laser weld two cover plates, improve the sealing performance of module, laser welding has the advantages such as weld thin, high strength, small heat affected zone, can effectively prevent dust, moisture and other adverse factors in external environment from invading the inside of module, thereby protecting internal component 3 from damage, and further prolonging the service life of the whole module.

[0069] The double layer cover plate structure can also enhance the electromagnetic shielding effect of the module to a certain extent, can effectively block external electromagnetic interference signals from entering the inside of the module, while reducing the radiation of internal signals to the outside, improve the purity and accuracy of signal processing.

[0070] The above only for the preferred embodiment of the utility model has been described, and does not limit the utility model, any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dual-channel receiving pre-processing module for limiting, amplifying and pre-selecting filtering a signal, and outputting a self-checking signal and a detection signal, characterized in that, The module is divided into an upper channel module and a lower channel module; ​ The module is externally provided with two signal input ports, when the module is in a receiving mode, the signal received by the antenna enters the double-channel receiving pre-processing module through the signal input ports after passing through an external filter and a circulator; When the module is in a transmitting mode, an excitation signal reaches the antenna through the circulator.

2. A dual channel receive pre-processing module according to claim 1, wherein, The upper channel module is provided with a first limiter, the output end of the first limiter is connected with the input end of a first low-noise amplifier, the output end of the first low-noise amplifier is connected with the input end of a first filter, the first filter is used for filtering out stray waves and out-of-band interference in the input signal, the output end of the first filter is connected with a first programmable attenuator; The first programmable attenuator is connected with a first equalizer, the input end of the first equalizer is connected with a first amplifier, the output end of the first amplifier is connected with a third filter, the third filter is connected with a first switch, the first switch is connected with two branches, the two branches include a first branch and a second branch.

3. A dual channel receive pre-processing module according to claim 2, wherein, The lower channel module is provided with a second limiter, the output end of the second limiter is connected with the input end of a second low-noise amplifier, the output end of the second low-noise amplifier is connected with the input end of a second filter, the second filter is used for filtering out stray waves and out-of-band interference in the input signal, the output end of the second filter is connected with a second programmable attenuator; The second programmable attenuator is connected with a second equalizer, the input end of the second equalizer is connected with a second amplifier, the output end of the second amplifier is connected with a fourth filter, the fourth filter is connected with a second switch; The second switch is connected with a branch, the branch includes a third branch and a fourth branch.

4. A dual channel receive pre-processing module according to claim 3, wherein, The first branch is connected with a first π attenuator, the signal attenuated by the first π attenuator is connected with a radio frequency signal RF2 input end; The second branch is divided into a second branch A and a second branch B, the second branch A is connected with a first power divider, the output end of the first power divider is divided into two, the output end of the first power divider is respectively connected with a first attenuator and a first detection comparator, the second branch B is connected with a load.

5. A dual channel receive pre-processing module according to claim 4, wherein, The third branch is connected with a second π attenuator, the signal attenuated by the second π attenuator is connected with a radio frequency signal RF4 input end; The fourth branch includes a fourth branch A and a fourth branch B, the fourth branch A is connected with a second power divider, the second power divider is respectively connected with a second attenuator and a second detection comparator, the fourth branch B is connected with a load.

6. The dual channel receive pre-processing module of claim 1, wherein, The components of the upper channel module and the lower channel module are connected through glass beads.

7. The dual channel receive pre-processing module of claim 1, wherein, The low-frequency signal output by the double-channel receiving pre-processing module is connected with a digital processing board through a J30J series connector.

8. A dual channel receive pre-processing module according to claim 5, wherein, The double-channel receiving pre-processing module is externally connected with the output ends of the radio frequency signals RF2 and RF4 through a radio frequency coaxial connector JSMP(M)-J.

9. The dual channel receive pre-processing module of claim 1, wherein, The size of the double-channel receiving pre-processing module is 70mm×35mm×14mm.

10. The dual channel receive pre-processing module of claim 1, wherein, The double-channel receiving pre-processing module includes a front double-layer cover plate and internal components, the double-layer cover plate includes an inner cover plate and an outer cover plate, the inner cover plate is connected with the internal components through screws, and the outer cover plate is laser welded with the inner cover plate.

Images