CN216565121U - S-band and X-band receiving channel gain self-adaptive adjusting system - Google Patents
S-band and X-band receiving channel gain self-adaptive adjusting system Download PDFInfo
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- CN216565121U CN216565121U CN202121458450.7U CN202121458450U CN216565121U CN 216565121 U CN216565121 U CN 216565121U CN 202121458450 U CN202121458450 U CN 202121458450U CN 216565121 U CN216565121 U CN 216565121U
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Abstract
The utility model discloses an S-band and X-band receiving channel gain self-adaptive adjusting system, which comprises an FPGA, an S-band gain adjusting mechanism and an X-band gain adjusting mechanism, wherein the S-band gain adjusting mechanism and the X-band gain adjusting mechanism respectively comprise a power divider, a wave detector, a wave filter, an amplifier and a numerical control attenuator, the output end of the power divider is respectively connected with the wave detector and the wave filter, the wave detector is connected with the numerical control attenuator through the FPGA, and the wave filter is connected with the numerical control attenuator through the amplifier; and the output ends of the numerical control attenuators of the S-band gain adjusting mechanism and the X-band gain adjusting mechanism are respectively connected with the combiner. The utility model can detect different levels according to different input signal sizes and transmit the levels to the FPGA, and the gain of the whole receiving channel is modified by automatically controlling the numerical control attenuator through the FPGA, thereby greatly optimizing the circuit design and improving the working efficiency.
Description
Technical Field
The utility model belongs to the technical field of gain self-adaptive adjusting circuits, and particularly relates to a gain self-adaptive adjusting system for receiving channels of S wave bands and X wave bands.
Background
In the existing gain adaptive circuit design, the gain is always changed directly through the modification of the attenuator in the receiving channel, and each time the attenuator is changed, the gain design of the link is completely fixed, and the debugging workload is also increased. If the gain is changed according to different input signal sizes, the whole receiving channel needs to be redesigned, and a schematic diagram, a PCB (printed circuit board) need to be redesigned and debugged, so that the workload is large, the working efficiency is low, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an adaptive gain adjustment system for receiving channels in an S wave band and an X wave band, and aims to solve the problems.
The utility model is mainly realized by the following technical scheme:
an S-band and X-band receiving channel gain self-adaptive adjusting system comprises an FPGA, an S-band gain adjusting mechanism and an X-band gain adjusting mechanism, wherein the S-band gain adjusting mechanism and the X-band gain adjusting mechanism respectively comprise a power divider, a wave detector, a filter, an amplifier and a numerical control attenuator, the output end of the power divider is respectively connected with the wave detector and the filter, the wave detector is connected with the numerical control attenuator through the FPGA, and the filter is connected with the numerical control attenuator through the amplifier; and the output ends of the numerical control attenuators of the S-band gain adjusting mechanism and the X-band gain adjusting mechanism are respectively connected with the combiner.
In the using process of the utility model, after the radio frequency signal enters the receiving channel, the radio frequency signal is divided into two paths by the power divider, one path of the radio frequency signal is input into the detector for detection and is sent into the FPGA for sampling, and the other path of the radio frequency signal enters the receiving channel for frequency conversion and amplification. Because the detector is at the most preceding stage, different levels can be detected according to different input signal sizes at each time and then transmitted to the FPGA, and the gain of the whole receiving channel is modified by automatically controlling the numerical control attenuator through the FPGA, the circuit design is greatly optimized, and the working efficiency is also improved. The FPGA circuit and the method for controlling the numerical control attenuator by the FPGA are both in the prior art and are not the main improvement point of the utility model, so the details are not repeated.
In order to better implement the present invention, further, the S-band gain adjustment mechanism further includes a plurality of S-band receiving channels, and the S-band receiving channels are respectively connected to the detector and the filter through the power divider; the X-band gain adjusting mechanism comprises a plurality of X-band receiving channels, and the X-band receiving channels are respectively connected with the wave detector and the filter through the power divider.
In order to better implement the present invention, further, there are 2S-band receiving channels and 4X-band receiving channels.
In order to better implement the utility model, further, the power dividers at the output ends of two adjacent S-band receiving channels are connected with a first numerical control attenuator through a first control switch, and a filter and an amplifier are sequentially arranged between the first control switch and the first numerical control attenuator.
In order to better implement the present invention, further, the output ends of the power dividers at the output ends of two adjacent X-band receiving channels are both connected to the second control switch, and the output end of the adjacent second control switch is connected to the second digital control attenuator through the third control switch; and a filter and an amplifier are sequentially arranged between the third control switch and the second digital control attenuator.
In order to better realize the utility model, the S wave band is 2GHz-4GHz, and the X wave band is 7GHz-12 GHz.
When the radio frequency signal enters a link, the radio frequency signal is divided into two paths by the power divider, one path enters the detector, the detected signal is transmitted to the FPGA in a level mode, and the other path enters a channel and passes through the filter, the amplifier and the digital control attenuator. At the moment, the FPGA can judge the size of a signal input into the channel according to the detection level so as to control the attenuation gear of the numerical control attenuator, the two numerical control attenuators can attenuate by 60dB together, and finally the dynamic range of the link gain control can reach 60 dB. Aiming at the requirement of gain self-adaption of an S-band receiving channel and an X-band receiving channel, the utility model can provide circuit design of 2GHz-4GHz and 7GHz-12GHz of the S-band and the X-band. Standing waves in a full frequency band are 1.5 dB; the gain can reach-20 dB-44 dB.
The utility model has the beneficial effects that:
(1) according to the utility model, different levels can be detected according to different input signal sizes and transmitted to the FPGA, and the gain of the whole receiving channel is modified by automatically controlling the numerical control attenuator through the FPGA, so that the circuit design is greatly optimized, and the working efficiency is also improved;
(2) aiming at the requirement of gain self-adaption of an S-band receiving channel and an X-band receiving channel, the utility model can provide circuit design of 2GHz-4GHz of the S-band and 7GHz-12GHz of the X-band, and standing wave in a full frequency band is 1.5 dB; the gain can reach-20 dB-44dB, and the method has better practicability.
Drawings
FIG. 1 is an overall block diagram of the present invention;
fig. 2 is a schematic block diagram of adaptive gain adjustment of S-band and X-band receiving channels.
Detailed Description
Example 1:
an adaptive gain adjustment system for receiving channels in S-band and X-band comprises a power divider, a detector, an FPGA, a filter, an amplifier and a numerical control attenuator, wherein the output end of the power divider is respectively connected with the detector and the filter, the detector is connected with the numerical control attenuator through the FPGA, and the filter is connected with the numerical control attenuator through the amplifier.
In the using process of the utility model, after the radio frequency signal enters the receiving channel, the radio frequency signal is divided into two paths by the power divider, one path of the radio frequency signal is input into the detector for detection and is sent into the FPGA for sampling, and the other path of the radio frequency signal enters the receiving channel for frequency conversion and amplification. Because the detector is at the most preceding stage, different levels can be detected according to different input signal sizes at each time and then transmitted to the FPGA, and the gain of the whole receiving channel is modified by automatically controlling the numerical control attenuator through the FPGA, the circuit design is greatly optimized, and the working efficiency is also improved.
Example 2:
the embodiment is optimized on the basis of embodiment 1, and as shown in fig. 2, the embodiment further includes an S-band gain adjustment mechanism and an X-band gain adjustment mechanism, where the S-band gain adjustment mechanism includes a plurality of S-band receiving channels, a power divider, a detector, an FPGA, a filter, an amplifier, and a first numerical control attenuator, the S-band receiving channels are respectively connected with the detector and the filter through the power divider, the detector is connected with the first numerical control attenuator through the FPGA, and the filter is connected with the first numerical control attenuator through the amplifier; the X-band gain adjusting mechanism comprises a plurality of X-band receiving channels, a power divider, a wave detector, an FPGA (field programmable gate array), a filter, an amplifier and a second numerical control attenuator, wherein the X-band receiving channels are respectively connected with the wave detector and the filter through the power divider, the wave detector is connected with the second numerical control attenuator through the FPGA, and the filter is connected with the second numerical control attenuator through the amplifier; and the output ends of the first numerical control attenuator and the second numerical control attenuator are respectively connected with the combiner.
Further, the number of the S-band receiving channels is 2, and the number of the X-band receiving channels is 4.
Furthermore, the power dividers at the output ends of the two adjacent S-band receiving channels are connected with a first numerical control attenuator through a first control switch, and a filter and an amplifier are sequentially arranged between the first control switch and the first numerical control attenuator.
Furthermore, the output ends of the power dividers at the output ends of two adjacent X-band receiving channels are both connected with a second control switch, and the output end of the adjacent second control switch is connected with a second numerical control attenuator through a third control switch; and a filter and an amplifier are sequentially arranged between the third control switch and the second digital control attenuator.
When the radio frequency signal enters a link, the radio frequency signal is divided into two paths through the power divider, one path enters the detector, the detected signal size is transmitted to the FPGA in a level mode, and the other path enters a channel and passes through the filter, the amplifier and the numerical control attenuator. At the moment, the FPGA can judge the size of a signal input into the channel according to the detection level so as to control the attenuation gear of the numerical control attenuator, the two numerical control attenuators can attenuate by 60dB together, and finally the dynamic range of the link gain control can reach 60 dB. Aiming at the requirement of gain self-adaption of an S-band receiving channel and an X-band receiving channel, the utility model can provide circuit design of 2GHz-4GHz and 7GHz-12GHz of the S-band and the X-band. Standing waves in a full frequency band are 1.5 dB; the gain can reach-20 dB-44 dB.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
a self-adaptive gain adjustment system for S-band and X-band receiving channels is shown in figure 2 and comprises a plurality of S-band receiving channels, X-band receiving channels, a first numerical control attenuator and a second numerical control attenuator. The S-band receiving channel is used for receiving the radio-frequency signals of the S band, the radio-frequency signals of the S band respectively enter the wave detector and the filter through the power divider, the wave detector is connected with the first numerical control attenuator through the FPGA, and the filter is connected with the first numerical control attenuator through the amplifier. The X-waveband receiving channel is used for receiving radio-frequency signals of an X waveband, the radio-frequency signals of the X waveband respectively enter the detector and the filter through the power divider, the detector is connected with the second numerical control attenuator through the FPGA, and the filter is connected with the second numerical control attenuator through the amplifier. And the output ends of the first numerical control attenuator and the second numerical control attenuator are respectively connected with the combiner.
Furthermore, the number of the S-band receiving channels is 2, the power dividers at the output ends of the two S-band receiving channels are connected with the first numerical control attenuator through the first control switch, and the filter and the amplifier are sequentially arranged between the first control switch and the first numerical control attenuator.
Aiming at the radio frequency signals of S wave bands, firstly, two paths of radio frequency signals of S wave bands enter the front end, respectively enter a detector through power dividers of respective links, detected levels of the detectors are input into an FPGA (field programmable gate array), the sizes of the two paths of radio frequency signals at the moment are judged through sampling of the FPGA, a first control switch of a main circuit is controlled to enable the radio frequency signals of the larger path to enter a receiving channel, and the radio frequency signals of the larger path are output after amplification, attenuation and temperature compensation. In the link, the FPGA can control the switch and the digital controlled attenuator according to the size of the input signal, so that the gain on the whole S-band link is changed according to the size of the input signal, and the self-adaptive gain effect is realized.
Furthermore, 4X-band receiving channels are arranged, the output ends of the power dividers at the output ends of two adjacent X-band receiving channels are connected with the second control switch, and the output end of the adjacent second control switch is connected with the second numerical control attenuator through the third control switch; and a filter and an amplifier are sequentially arranged between the third control switch and the second digital control attenuator.
Aiming at radio frequency signals of X wave bands, four paths of radio frequency signals of X wave bands enter the front end and respectively enter a detector through power dividers of respective links, the level detected by the detector is input into an FPGA (field programmable gate array), the size of the four paths of radio frequency signals at the moment is judged through sampling of the FPGA, a second control switch and a third control switch of a main circuit are controlled to enable the radio frequency signals of the largest path to enter a receiving channel, and the radio frequency signals are amplified, attenuated and frequency down-converted to S wave bands and then combined with signals of the S wave bands for output. In the link, the FPGA can control the switch and the numerical control attenuator according to the size of the input signal, so that the gain on the whole X-band link is changed according to the size of the input signal, the self-adaptive gain effect is realized, the hardware circuit is greatly simplified, the cost is saved, detection sampling is carried out at the front-end radio frequency input port, the link is greatly optimized, and the debugging efficiency is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. An S-band and X-band receiving channel gain self-adaptive adjusting system is characterized by comprising an FPGA, an S-band gain adjusting mechanism and an X-band gain adjusting mechanism, wherein the S-band gain adjusting mechanism and the X-band gain adjusting mechanism respectively comprise a power divider, a detector, a filter, an amplifier and a numerical control attenuator, the output end of the power divider is respectively connected with the detector and the filter, the detector is connected with the numerical control attenuator through the FPGA, and the filter is connected with the numerical control attenuator through the amplifier; and the output ends of the numerical control attenuators of the S-band gain adjusting mechanism and the X-band gain adjusting mechanism are respectively connected with the combiner.
2. The adaptive gain adjustment system for the S-band and X-band receiving channels according to claim 1, wherein the gain adjustment mechanism for the S-band further comprises a plurality of S-band receiving channels, and the S-band receiving channels are respectively connected with the detector and the filter through the power divider; the X-band gain adjusting mechanism comprises a plurality of X-band receiving channels, and the X-band receiving channels are respectively connected with the wave detector and the filter through the power divider.
3. The adaptive gain adjustment system for S-band and X-band receive channels according to claim 2, wherein there are 2S-band receive channels and 4X-band receive channels.
4. The adaptive gain adjustment system for the S-band and X-band receiving channels according to claim 3, wherein the power dividers at the output ends of two adjacent S-band receiving channels are connected with the first digitally controlled attenuator through the first control switch, and a filter and an amplifier are sequentially arranged between the first control switch and the first digitally controlled attenuator.
5. The adaptive gain adjustment system for the S-band and X-band receiving channels according to claim 3, wherein the output ends of the power dividers at the output ends of two adjacent X-band receiving channels are both connected to the second control switch, and the output end of the adjacent second control switch is connected to the second digital controlled attenuator through the third control switch; and a filter and an amplifier are sequentially arranged between the third control switch and the second digital control attenuator.
6. The adaptive gain adjustment system for S-band and X-band receiving channels according to any one of claims 2-5, wherein the S-band is 2GHz-4GHz and the X-band is 7GHz-12 GHz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173884A (en) * | 2022-06-16 | 2022-10-11 | 中国船舶集团有限公司第七二三研究所 | Automatic gain control MISO radio frequency signal switch network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173884A (en) * | 2022-06-16 | 2022-10-11 | 中国船舶集团有限公司第七二三研究所 | Automatic gain control MISO radio frequency signal switch network |
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