Satellite signal forwarding circuit capable of adjusting gain

Abstract

The invention provides a satellite signal forwarding circuit capable of adjusting gain, which is characterized by comprising a signal receiving module, an amplifying and filtering module, a gain adjusting module, a numerical control attenuation module and a signal transmitting module which are connected in sequence, the received signals comprise satellite signals of N frequency bands, and the processed received signals are divided into N paths of signals according to the frequency bands; the amplifying and filtering module is used for amplifying and filtering each path of signal, so that the power of the processed N paths of signals is the same; and the gain adjusting module is used for mixing the processed N paths of signals, inputting the mixed signals into N forwarding channels, and acquiring an attenuation value of the signal in each forwarding channel. The invention provides a satellite signal forwarding circuit capable of adjusting gain. The satellite signal forwarding circuit is used for solving the problem that a user receiver cannot perform navigation and positioning in an indoor area or an area where satellite signals cannot be received, such as a cartridge.

Description

Technical Field

[0001] The invention relates to the field of satellite technology, and in particular to a satellite signal forwarding circuit with adjustable gain. Background Art

[0002] Currently, the frequency used by navigation satellites is the L band, the satellite landing signal is weak, and the receiving end uses a wide beam antenna. Therefore, the user receiver must be in an open area without obstructions to work properly. When the user receiver is indoors or in an area where satellite signals cannot be received, navigation positioning cannot be performed. Summary of the invention

[0003] The invention provides a satellite signal forwarding circuit with adjustable gain, which is used to solve the problem that a user receiver cannot perform navigation and positioning in an area such as indoors or in a barrel where no satellite signal can be received.

[0004] The present invention provides a satellite signal forwarding circuit with adjustable gain, comprising a signal receiving module, an amplifying and filtering module, a gain adjusting module, a digitally controlled attenuation module and a signal transmitting module connected in sequence, wherein:

[0005] The signal receiving module is used to perform power limitation and out-of-band suppression processing on the received signal, the received signal includes satellite signals of N frequency bands, and the processed received signal is divided into N signals according to the frequency band;

[0006] The amplification and filtering module is used to amplify and filter each signal separately, so that the power of the N signals after processing is the same;

[0007] The gain adjustment module is used to mix the processed N-channel signals, input the mixed signals into N forwarding channels, and obtain the attenuation value of the signal in each forwarding channel;

[0008] The digital control attenuation module is used to attenuate the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel;

[0009] The signal sending module is used to filter the attenuated signal in each forwarding channel and send out the filtered signal in each forwarding channel.

[0010] The above solution solves the problem that the user's receiver cannot perform navigation and positioning in areas such as indoors or in missile tubes where satellite signals cannot be received, and can accurately adjust the signal gain to meet the needs of the user's receiver; since the components are low-cost and easy to purchase, the product research and development efficiency is improved and the hardware development cost is saved; there are no requirements for the antenna, and the antenna can be configured according to the user's needs, and it has strong applicability; the gain adjustment range and forwarding signal frequency can be adjusted by changing the attenuator and filter models according to actual needs, with good versatility, strong compatibility, and fixed software without risk.

[0011] Optionally, the signal receiving module, the amplifying and filtering module, the gain adjusting module, the digitally controlled attenuation module and the signal sending module are connected on a printed circuit board through signal routing.

[0012] Optionally, the signal receiving module includes a first filter and a power divider.

[0013] Optionally, the amplifying and filtering module includes an amplifier and a second filter corresponding to each signal.

[0014] Optionally, the attenuation value of the signal in each forwarding channel is obtained through a knob corresponding to each forwarding channel.

[0015] Optionally, the knob is connected to the gain adjustment module via a cable.

[0016] Optionally, the gain adjustment module and the digitally controlled attenuation module share FPGA and FLASH, and the digitally controlled attenuation module further includes a digitally controlled attenuator corresponding to each forwarding channel.

[0017] Optionally, attenuating the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel includes:

[0018] The sampling voltage circuit based on the FPGA samples the attenuation value of the signal in each forwarding channel, and controls the digitally controlled attenuator corresponding to each forwarding channel to attenuate the signal in each forwarding channel according to the sampling result.

[0019] Optionally, the adjustment range of the attenuation value is 0 to 31 dB.

[0020] Optionally, the signal sending module includes a third filter corresponding to each forwarding channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

[0022] Figure 1 A schematic diagram of a satellite signal forwarding circuit with adjustable gain provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Some terms used in the embodiments are described below to facilitate understanding by those skilled in the art.

[0025] L band: refers to the radio wave band with a frequency of 1-2GHz, which can be used for DAB, satellite navigation systems, etc.

[0026] Satellite signal: It is composed of carrier, ranging code and data code, and can be used to complete navigation and positioning.

[0027] User receiver: used to receive satellite signals for capture, tracking and positioning. When the satellite signal power is too weak, the satellite signal cannot be captured.

[0028] FPGA: Programmable Logic Controller.

[0029] Figure 1 The framework of a satellite signal forwarding circuit with adjustable gain provided by an embodiment of the present invention is shown in detail, including a signal receiving module, an amplifying and filtering module, a gain adjusting module, a digitally controlled attenuation module and a signal transmitting module connected in sequence.

[0030] In one example, the signal receiving module, the amplifying and filtering module, the gain adjusting module, the digitally controlled attenuation module and the signal sending module are connected on a printed circuit board through signal traces.

[0031] The signal receiving module is used to perform power limitation and out-of-band suppression processing on the received signal, the received signal includes satellite signals of N frequency bands, and the processed received signal is divided into N signals according to the frequency bands.

[0032] In one example, N is 2.

[0033] The received signal is a satellite signal from the receiving antenna. This solution has no requirements for the antenna, and the antenna can be configured according to the user's needs. In order to prevent the received signal power from being too large and damaging the circuit, the received signal must first be power-limited, and then out-of-band suppression must be performed to filter out out-of-band interference signals. Since the subsequent amplifier has requirements for the signal frequency band, it cannot uniformly amplify signals in N frequency bands, but the received signal contains satellite signals in N frequency bands, so the processed received signal must first be divided into N signals by frequency band.

[0034] In one example, the signal receiving module includes a first filter and a power divider.

[0035] The amplification and filtering module is used to amplify and filter each signal separately, so that the power of the N signals after processing is the same.

[0036] In one example, the amplification and filtering module includes an amplifier and a second filter corresponding to each signal.

[0037] The gain adjustment module is used to mix the processed N-channel signals, input the mixed signals into N forwarding channels, and obtain the attenuation value of the signal in each forwarding channel.

[0038] It should be noted that the mixed signal is no longer input into multiple forwarding channels separately, and the same mixed signal is input into each forwarding channel.

[0039] In one example, the attenuation value of the signal in each forwarding channel is obtained through a knob corresponding to each forwarding channel.

[0040] Furthermore, the knob is connected to the gain adjustment module via a cable.

[0041] The digital control attenuation module is used to attenuate the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel.

[0042] In one example, the gain adjustment module and the digital control attenuation module share FPGA and FLASH, and the digital control attenuation module further includes a digital control attenuator corresponding to each forwarding channel.

[0043] Further, attenuating the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel includes:

[0044] The sampling voltage circuit (XADC) based on FPGA samples the attenuation value of the signal in each forwarding channel, and controls the digitally controlled attenuator corresponding to each forwarding channel to attenuate the signal in each forwarding channel according to the sampling result.

[0045] In one example, the adjustment range of the attenuation value is 0-31 dB, and the step value may be 1 dB.

[0046] The signal sending module is used to filter the attenuated signal in each forwarding channel and send out the filtered signal in each forwarding channel.

[0047] In one example, the signal sending module includes a third filter corresponding to each forwarding channel.

[0048] The signal sending module sends the filtered signal to the transmitting antenna, which is finally sent to the user receiver by the transmitting antenna.

[0049] The above solution solves the problem that the user's receiver cannot perform navigation and positioning in areas such as indoors or in missile tubes where no satellite signals can be received, and can accurately adjust the signal gain to meet the needs of the user's receiver; since the components are low-cost and easy to purchase, the product research and development efficiency is improved and the hardware development cost is saved; there are no requirements for the antenna, and the antenna can be configured according to the user's needs, and it has strong applicability; the gain adjustment range and forwarding signal frequency can be adjusted by changing the attenuator and filter models according to actual needs, with good versatility, strong compatibility, and fixed software without risk.

[0050] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A satellite signal forwarding circuit with adjustable gain, characterized in that: It includes a signal receiving module, an amplifying and filtering module, a gain adjustment module, a digitally controlled attenuation module and a signal transmitting module connected in sequence, wherein: The signal receiving module is used to perform power limitation and out-of-band suppression processing on the received signal, the received signal includes satellite signals of N frequency bands, and the processed received signal is divided into N signals according to the frequency band; The amplification and filtering module is used to amplify and filter each signal separately, so that the power of the N signals after processing is the same; The gain adjustment module is used to mix the processed N-channel signals, input the mixed signals into N forwarding channels, and obtain the attenuation value of the signal in each forwarding channel; The digital control attenuation module is used to attenuate the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel; The signal sending module is used to filter the attenuated signal in each forwarding channel and send out the filtered signal in each forwarding channel.

2. The circuit according to claim 1, characterized in that: The signal receiving module, the amplifying and filtering module, the gain adjusting module, the digital control attenuation module and the signal sending module are connected on a printed circuit board through signal wiring.

3. The circuit according to claim 1, characterized in that: The signal receiving module includes a first filter and a power divider.

4. The circuit according to claim 1, characterized in that: The amplifying and filtering module includes an amplifier and a second filter corresponding to each signal.

5. The circuit according to claim 1, characterized in that: The attenuation value of the signal in each forwarding channel is obtained through the knob corresponding to each forwarding channel.

6. The circuit according to claim 5, characterized in that: The knob is connected to the gain adjustment module via a cable.

7. The circuit according to claim 1, characterized in that: The gain adjustment module and the digital control attenuation module share FPGA and FLASH, and the digital control attenuation module further includes a digital control attenuator corresponding to each forwarding channel.

8. The circuit according to claim 7, characterized in that: Attenuating the signal in each forwarding channel according to the attenuation value of the signal in each forwarding channel includes: The sampling voltage circuit based on the FPGA samples the attenuation value of the signal in each forwarding channel, and controls the digitally controlled attenuator corresponding to each forwarding channel to attenuate the signal in each forwarding channel according to the sampling result.

9. The circuit according to claim 1, characterized in that: The adjustment range of the attenuation value is 0-31dB.

10. The circuit according to claim 1, characterized in that: The signal sending module includes a third filter corresponding to each forwarding channel.

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