CN112994725A - High-power data transmission radio station device - Google Patents
High-power data transmission radio station device Download PDFInfo
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- CN112994725A CN112994725A CN202110076953.6A CN202110076953A CN112994725A CN 112994725 A CN112994725 A CN 112994725A CN 202110076953 A CN202110076953 A CN 202110076953A CN 112994725 A CN112994725 A CN 112994725A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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Abstract
The invention discloses a high-power data transmission radio station device, which comprises an MCU (microprogrammed control Unit), a baseband modem, a frequency mixer, an amplifier module, a tunable filter and an antenna, wherein the MCU is used for processing a signal received by the baseband modem; the MCU microprocessor is electrically connected with the baseband modem and is used for driving the baseband modem to work; the baseband modem is used for modulating and generating an I path signal and a Q path signal under the driving of the MCU microprocessor when the system is in a transmitting state, and respectively transmitting the I path signal and the Q path signal to the mixer; the frequency mixer is used for mixing the I path of signals to generate I path of radio frequency signals, mixing the Q path of signals to generate Q path of radio frequency signals, combining the I path of radio frequency signals and the Q path of radio frequency signals to generate output signals, and transmitting the output signals to the amplifier module for amplification processing, filtering by the tunable filter and radiating by the antenna. The invention has the characteristics of low power consumption, low cost, long transmission distance and the like.
Description
Technical Field
The invention relates to the field of data transmission, in particular to a data transmission platform device.
Background
With the rapid development of a Global Navigation Satellite System (GNSS), a Satellite Navigation positioning System is more widely applied, and a data transmission radio station based on GNSS RTK is an important device for receiving and positioning signals. However, the GNSS RTK data radio stations in the current market all have the problems of large power consumption, high cost, short transmission communication distance and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-power data transmission radio station device, which can solve the problems of high power consumption, high cost, short transmission communication distance and the like of the high-power data transmission radio station device in the prior art.
The purpose of the invention is realized by adopting the following technical scheme:
a high-power data transmission radio station device comprises an MCU (microprogrammed control Unit), a baseband modem, a mixer, an amplifier module, a tunable filter and an antenna; the MCU microprocessor is electrically connected with the baseband modem and is used for driving the baseband modem to work; the baseband modem is used for modulating and generating an I path signal and a Q path signal under the driving of the MCU microprocessor when the system is in a transmitting state; the first output end and the second output end of the baseband modem are respectively connected with the frequency mixer and used for respectively transmitting the I-path signal and the Q-path signal to the frequency mixer;
the output end of the frequency mixer is connected with the input end of the amplifier module and is used for mixing the I-path signal to generate an I-path radio-frequency signal, mixing the Q-path signal to generate a Q-path radio-frequency signal, combining the I-path radio-frequency signal and the Q-path radio-frequency signal to generate an output signal, and transmitting the output signal to the amplifier module for amplification; the amplifier module is connected with the antenna through the tunable filter and used for filtering the amplified output signal through the tunable filter and then radiating the amplified output signal through the antenna.
Furthermore, the I-path signal is an in-phase component, and the Q-path signal is a positive-phase component.
Furthermore, the frequency mixer comprises an I-path amplifier, a Q-path amplifier, a first I-path up-converter, a second I-path up-converter, a first Q-path up-converter, a second Q-path up-converter and a combiner;
the input end of the I-path amplifier is connected with the first output end of the baseband modem, the output end of the I-path amplifier is connected with the first input end of the first I-path frequency converter, and the output end of the first I-path frequency converter is connected with the combiner through the first input end of the second I-path frequency converter;
the input end of the Q-path amplifier is connected with the second output end of the baseband modem, the output end of the Q-path amplifier is connected with the first input end of the first Q-path frequency converter, and the output end of the first Q-path frequency converter is connected with the combiner through the first input end of the second Q-path frequency converter;
the second input end of the frequency converter on the first I path and the second input end of the frequency converter on the first Q path are both connected with intermediate-frequency local oscillation signals; a second input end of the frequency converter on the second I path and a second input end of the frequency converter on the second Q path are both connected with radio frequency local oscillator signals;
the I-path amplifier is used for amplifying the I-path signal and inputting the amplified I-path signal to the first I-path frequency converter, so that the first I-path frequency converter mixes the intermediate-frequency local oscillator signal with the I-path signal to generate an intermediate-frequency signal and sends the intermediate-frequency signal to the second I-path frequency converter; the second I-path upper frequency converter is used for generating an I-path output signal after mixing the intermediate frequency signal and the radio frequency local oscillator signal and sending the I-path output signal to the combiner;
the Q-path amplifier is used for amplifying the Q-path signal and inputting the amplified Q-path signal to the first Q-path frequency converter, so that the first Q-path frequency converter mixes the local oscillation signal with the Q-path signal to generate an intermediate frequency local oscillation signal and sends the intermediate frequency local oscillation signal to the second Q-path frequency converter; the second Q-way up-converter is used for generating a Q-way output signal after mixing the intermediate frequency signal and the radio frequency local oscillator signal and sending the Q-way output signal to the combiner;
and the combiner is used for combining the I path output signal and the Q path output signal to generate an output signal.
Further, the output signal is an unbalanced signal; the I-path amplifier and the Q-path amplifier are both variable gain amplifiers.
Furthermore, a second filter is arranged between the first I-way upper frequency converter and the second I-way upper frequency converter; and a third filter is arranged between the first Q-path up-converter and the second Q-path up-converter.
Further, a fourth filter is arranged between the combiner and the amplifier module.
Further, the amplifier module includes a first stage amplifier, an intermediate amplifier, and a final stage amplifier; the input end of the first-stage amplifier is connected with the output end of the combiner, the output end of the first-stage amplifier is connected with the input end of the final-stage amplifier through the intermediate amplifier, and the output end of the final-stage amplifier is connected with the input end of the tunable filter.
Furthermore, the first-stage amplifier is a low noise amplifier, the intermediate amplifier is a push-stage amplifier, and the final-stage amplifier is a power amplifier.
Further, the output end of the final amplifier is coupled with the radio frequency detection module through a microstrip line.
Further, a first filter is arranged between the baseband modem and the mixer.
Compared with the prior art, the invention has the beneficial effects that:
the high-power digital transmission radio station provided by the invention has the characteristics of low power consumption, low cost, long transmission distance and the like.
Drawings
FIG. 1 is a circuit block diagram of a high power data transmission station apparatus according to the present invention;
FIG. 2 is a circuit block diagram of the mixer of FIG. 1;
fig. 3 is a block diagram of a phase-locked loop circuit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention provides a high-power data transmission radio station device, which realizes the data transmission radio station by adopting key technologies such as 4FSK (frequency shift keying), GMSK (Gaussian shift keying) modulation and demodulation principles, secondary frequency conversion, ultra wide band radio frequency power amplifier matching and the like, so that the data transmission radio station has the characteristics of high power, high frequency stability and long communication distance.
As shown in fig. 1-3, a high power data transmission station apparatus includes an mcu (microcontroller unit) microprocessor, a baseband modem, a mixer, an amplifier module, and a tunable filter.
The MCU microprocessor is connected with the baseband modem and is used for driving the baseband modem to work and the configuration of other functions to work.
The output end of the baseband modem is electrically connected with the input end of the frequency mixer and used for modulating and generating an I-path signal and a Q-path signal under the driving of the MCU microprocessor and respectively sending the I-path signal and the Q-path signal to the frequency mixer. The I path signal is an in-phase component, and the Q path signal is a normal phase component.
The output end of the frequency mixer is electrically connected with the input end of the amplifier module and is used for respectively mixing the I-path signal and the Q-path signal to generate a corresponding I-path radio-frequency signal and a corresponding Q-path radio-frequency signal, and then combining the I-path radio-frequency signal and the Q-path radio-frequency signal into an unbalanced signal and transmitting the unbalanced signal to the amplifier module.
The output end of the amplifier module is connected with the antenna through the tunable filter and used for amplifying the unbalanced signal and then filtering the unbalanced signal through the tunable filter and then radiating the unbalanced signal through the antenna.
Preferably, as shown in fig. 2, the mixer includes an I-path amplifier, a Q-path amplifier, a first I-path up-converter, a first Q-path up-converter, a second Q-path up-converter, and a combiner.
The input end of the I-path amplifier is connected with the output end of the baseband modem, the output end of the I-path amplifier is connected with the first input end of the first I-path upper frequency converter, and the second input end of the first I-path upper frequency converter is connected with the intermediate frequency local oscillation signal.
And the I path amplifier is used for receiving the I path signal sent by the baseband modem, amplifying the I path signal and sending the amplified I path signal to the first I path up-converter. And the first I-path up-converter is used for mixing the amplified I-path signal with the intermediate-frequency local oscillator signal to obtain an I-path intermediate-frequency signal.
The output end of the first I-way upper frequency converter is connected with the first input end of the second I-way upper frequency converter, and the second input end of the second I-way upper frequency converter is connected with a radio frequency local oscillation signal. And the output end of the frequency converter on the second I-path is connected with the input end of the combiner.
And the second I-path upper frequency converter is used for mixing the I-path intermediate frequency signal with the radio frequency local oscillator signal to obtain an I-path radio frequency signal and sending the I-path radio frequency signal to the combiner.
Similarly, the same processing is applied to the Q-path signal. Namely: the input end of the Q-path amplifier is electrically connected with the output end of the baseband modem, the output end of the Q-path amplifier is connected with the first input end of the first Q-path upper frequency converter, and the second input end of the first Q-path upper frequency converter is connected with the intermediate frequency local oscillation signal.
And the Q-path amplifier is used for receiving the Q-path signal sent by the baseband modem, amplifying the Q-path signal and sending the Q-path signal to the first Q-path up-converter. And the first Q-path up-converter is used for mixing the amplified Q-path signal with the intermediate frequency local oscillator signal to obtain a Q-path intermediate frequency signal.
The output end of the frequency converter on the first Q circuit is connected with the first input end of the frequency converter on the second Q circuit, and the second input end of the frequency converter on the second Q circuit is connected with a radio frequency local oscillation signal. And the output end of the frequency converter on the second Q circuit is connected with the combiner.
And the second Q-path upper frequency converter is used for mixing the Q-path intermediate frequency signal with the radio frequency local oscillator signal to obtain a Q-path radio frequency signal and sending the Q-path radio frequency signal to the combiner.
Preferably, the combiner is configured to combine the I-path radio frequency signal and the Q-path radio frequency signal generated by the mixer into an output signal. More specifically, the output signal is an unbalanced signal.
The output end of the combiner is connected with the amplifier module and used for sending the output signal to the amplifier module for amplification.
The amplifier module is also connected with the antenna through a tunable filter and is used for filtering the amplified output signal through the tunable filter and then radiating the amplified output signal through the antenna to finish the transmission of the signal.
Preferably, the present invention employs a tunable filter for filtering after amplifying the output signal. The traditional design generally adopts a low-pass filter with fixed frequency to filter, so that stray in a system band can not be filtered, the frequency spectrum is impure, and other equipment is easily interfered. Therefore, the invention adopts the tunable filter to realize the filtering of the unbalanced signal, the center frequency of the tunable filter can be changed according to the change of the transmitting frequency, the bandwidth is narrow, other frequency components except the center frequency can be effectively filtered, the purity of the frequency spectrum is improved, and the harmful interference is reduced.
Preferably, the amplifier block of the present embodiment includes a first-stage amplifier, an intermediate amplifier, and a final-stage amplifier. The first-stage amplifier is a low-noise amplifier and has the characteristic of low noise coefficient. The intermediate amplifier is a push-stage amplifier and is used for amplifying and processing small signals and plays a role in pushing. The final amplifier is a power amplifier, is a high-efficiency class-C amplifier and has the characteristics of high transmitting power, low power consumption, high efficiency and the like. The invention realizes the amplification of the transmitted signal by adopting the three-stage amplifier, so that the overall radio frequency gain of the transmitting link is up to 45dB, and the radio frequency output power is 30W.
Preferably, the three-stage amplifiers in this embodiment all use a bandwidth impedance matching technique, so that the whole system has good gain when operating in a wide frequency band of 400Mhz to 473 Mhz.
Preferably, the input end of the low noise amplifier is connected to the output end of the combiner, and the output end of the low noise amplifier is connected to the push-stage amplifier, and is configured to perform low noise amplification on the output signal sent by the combiner and send the amplified output signal to the push-stage amplifier for further amplification.
The push-stage amplifier is also connected with the tunable filter through the final-stage amplifier, and is used for transmitting the amplified output signal to the final-stage amplifier, further amplifying the amplified output signal, filtering the amplified output signal through the tunable filter, and radiating the amplified output signal through an antenna.
Preferably, the final amplifier is also connected to a radio frequency detection module. The radio frequency detection module is used for detecting the transmitting power of the radio station device, and the output power of the radio station device is controlled by providing a feedback signal, so that the stability of the transmitting power of the radio station is ensured. Preferably, the radio frequency detection module is coupled with the output end of the final amplifier by means of microstrip line coupling.
Preferably, a first filter is provided between the baseband modem and the mixer. And a second filter is arranged between the first I-shaped upper frequency converter and the second I-shaped upper frequency converter. And a third filter is arranged between the first Q-path up-converter and the second Q-path up-converter. And a fourth filter is arranged between the combiner and the amplifier module.
The first filter, the second filter, the third filter and the fourth filter are used for filtering the signals.
And a second input end of the first I-path frequency converter and a second input end of the first Q-path frequency converter are connected to the intermediate-frequency local oscillation signal through 2/4 frequency dividers. And a second input end of the frequency converter on the second I path and a second input end of the frequency converter on the second Q path are both connected with a radio frequency local oscillation signal through 2/4 frequency dividers. The radio frequency local oscillator signal is an external radio frequency local oscillator signal. The intermediate frequency local oscillator signal is an intermediate frequency local oscillator signal inside the system.
Preferably, the combiner is a balun, and is configured to combine the I-path radio frequency signal and the Q-path radio frequency signal into one path of unbalanced signal.
Preferably, the I-path amplifier and the Q-path amplifier are both variable gain amplifiers.
Further, a low noise amplifier refers to an amplifier having a low noise figure. Wherein, the noise system is positioned as the ratio of the signal-to-noise ratio of the input end of the amplifier to the signal-to-noise ratio of the output end, namely:
the physical meaning of the noise coefficient means that after a signal is amplified by an amplifier, the signal-to-noise ratio is deteriorated due to noise generated by the amplifier, the factor of reduction of the signal-to-noise ratio is the noise coefficient, and a noise system is generally expressed by decibels.
At this time: nf (db) ═ 101 gF.
The noise figure of the single-stage amplifier is expressed as:
wherein NF isminThe minimum noise coefficient of the transistor is determined by the amplifier tube; gamma-shapedoptTo obtain NFminThe minimum optimum source reflection coefficient of time; rnIs a transistor equivalent noise resistance; gamma-shapedsIs the source reflection coefficient at the input of the transistor. I.e. when r is equal tos＝ΓoptThe low noise amplifier noise has a minimum value NFmin。
The noise figure expression for a multistage amplifier is:
wherein, FnIs the noise figure of the nth stage amplifier, GnIs the gain of the nth stage amplifier.
For a multi-stage amplifier, therefore, the first stage amplifier is the main source of the whole transmission system, i.e. it means that the smaller the noise figure of the first stage amplifier, the less the noise of the whole transmission chain. Meanwhile, the gain of the amplifier is moderate, and meanwhile, in order to suppress the influence of noise of each subsequent stage on the system performance, the gain of the amplifier of the first stage cannot be too small. Since the gain of the first stage acoustic amplifier is too large, the input signal of the next stage amplifier is too large, and serious nonlinear distortion is generated, so that the noise and the gain of the first stage amplifier have a mutually restricted relationship.
More specifically, the first-stage amplifier in this embodiment is a low noise amplifier, and the noise factor of the first-stage amplifier is 0.5dB, so that the noise of the entire transmission system is greatly reduced, the communication distance is ensured, and the communication distance of the transmission system is further increased.
Preferably, the local oscillator signal in the present invention is generated by a phase-locked loop circuit. The phase-locked loop is a feedback system, and as shown in fig. 3, includes a loop structure composed of a reference frequency divider, a phase discriminator, an N-divider, a loop filter, and a voltage-controlled oscillator. The input reference signal is subjected to frequency division through a reference frequency divider, then a frequency division signal is output, and the output frequency division signal is sent to the phase frequency detector. The phase frequency detector is used for comparing the output frequency division signal with a phase detection reference signal, converting the phase error of the output frequency division signal and the phase detection reference signal into an error voltage signal, and filtering the error voltage signal by a loop filter and then inputting the error voltage signal into the voltage-controlled oscillator. And the voltage-controlled oscillator is used for generating an output signal with a specific frequency according to the filtered error voltage signal. Meanwhile, the output end of the voltage-controlled oscillator is electrically connected with the input end of the phase frequency detector and used for feeding back an output signal to the phase frequency detector, so that the output signal of the voltage-controlled oscillator can accurately track the frequency of an applied frequency or phase modulation signal.
The output frequency of the phase-locked loop has a great relationship with the reference frequency, and when the reference frequency is inaccurate, the output frequency of the phase-locked loop is also inaccurate. In a high-power radio station, due to the fact that the transmission power is too high, the working temperature of the radio station is too high, and the frequency of a crystal oscillator drifts along with the rise of the temperature, namely temperature drift. Due to the temperature drift, the transmitting frequency of the radio station shifts after operating for a period of time, which affects the receiving of the receiving end and thus the communication distance. Therefore, in the design, a crystal oscillator with temperature compensation is adopted, the frequency of a local oscillation signal output by a phase-locked loop is not influenced even if the temperature changes, the frequency stability of the oscillator at minus 30 ℃ to plus 75 ℃ reaches +/-0.5 ppm, the high frequency stability of a radio station in the temperature change range is ensured, and high-stability long-distance communication is ensured.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A high-power data transmission radio station device is characterized by comprising an MCU microprocessor, a baseband modem, a frequency mixer, an amplifier module, a tunable filter and an antenna; the MCU microprocessor is electrically connected with the baseband modem and is used for driving the baseband modem to work; the baseband modem is used for modulating and generating an I path signal and a Q path signal under the driving of the MCU microprocessor when the system is in a transmitting state; the first output end and the second output end of the baseband modem are respectively connected with the frequency mixer and used for respectively transmitting the I-path signal and the Q-path signal to the frequency mixer;
the output end of the frequency mixer is connected with the input end of the amplifier module and is used for mixing the I-path signal to generate an I-path radio-frequency signal, mixing the Q-path signal to generate a Q-path radio-frequency signal, combining the I-path radio-frequency signal and the Q-path radio-frequency signal to generate an output signal, and transmitting the output signal to the amplifier module for amplification; the amplifier module is connected with the antenna through the tunable filter and used for filtering the amplified output signal through the tunable filter and then radiating the amplified output signal through the antenna.
2. The device as claimed in claim 1, wherein the I signal is an in-phase component and the Q signal is a non-phase component.
3. The apparatus of claim 1, wherein the mixer comprises an I-path amplifier, a Q-path amplifier, a first I-path up-converter, a second I-path up-converter, a first Q-path up-converter, a second Q-path up-converter, and a combiner;
the input end of the I-path amplifier is connected with the first output end of the baseband modem, the output end of the I-path amplifier is connected with the first input end of the first I-path frequency converter, and the output end of the first I-path frequency converter is connected with the combiner through the first input end of the second I-path frequency converter;
the input end of the Q-path amplifier is connected with the second output end of the baseband modem, the output end of the Q-path amplifier is connected with the first input end of the first Q-path frequency converter, and the output end of the first Q-path frequency converter is connected with the combiner through the first input end of the second Q-path frequency converter;
the second input end of the frequency converter on the first I path and the second input end of the frequency converter on the first Q path are both connected with intermediate-frequency local oscillation signals; a second input end of the frequency converter on the second I path and a second input end of the frequency converter on the second Q path are both connected with radio frequency local oscillator signals;
the I-path amplifier is used for amplifying the I-path signal and inputting the amplified I-path signal to the first I-path frequency converter, so that the first I-path frequency converter mixes the intermediate-frequency local oscillator signal with the I-path signal to generate an intermediate-frequency signal and sends the intermediate-frequency signal to the second I-path frequency converter; the second I-path upper frequency converter is used for generating an I-path output signal after mixing the intermediate frequency signal and the radio frequency local oscillator signal and sending the I-path output signal to the combiner;
the Q-path amplifier is used for amplifying the Q-path signal and inputting the amplified Q-path signal to the first Q-path frequency converter, so that the first Q-path frequency converter mixes the local oscillation signal with the Q-path signal to generate an intermediate frequency local oscillation signal and sends the intermediate frequency local oscillation signal to the second Q-path frequency converter; the second Q-way up-converter is used for generating a Q-way output signal after mixing the intermediate frequency signal and the radio frequency local oscillator signal and sending the Q-way output signal to the combiner;
and the combiner is used for combining the I path output signal and the Q path output signal to generate an output signal.
4. The high power data radio device according to claim 3, wherein the output signal is an unbalanced signal; the I-path amplifier and the Q-path amplifier are both variable gain amplifiers.
5. The high power data transmission station device according to claim 3, wherein a second filter is disposed between the first I-way up-converter and the second I-way up-converter; and a third filter is arranged between the first Q-path up-converter and the second Q-path up-converter.
6. The device of claim 3, wherein a fourth filter is disposed between the combiner and the amplifier module.
7. The high power data radio device according to claim 1, wherein the amplifier module comprises a first stage amplifier, an intermediate amplifier and a final stage amplifier; the input end of the first-stage amplifier is connected with the output end of the combiner, the output end of the first-stage amplifier is connected with the input end of the final-stage amplifier through the intermediate amplifier, and the output end of the final-stage amplifier is connected with the input end of the tunable filter.
8. The high power data radio device according to claim 7, wherein the first stage amplifier is a low noise amplifier, the intermediate amplifier is a push stage amplifier, and the final stage amplifier is a power amplifier.
9. The apparatus of claim 8, wherein the output terminal of the final amplifier is coupled to the rf detection module through a microstrip line.
10. The high power data radio device according to claim 1, wherein a first filter is disposed between the baseband modem and the mixer.
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| CN113992224A (en) * | 2021-10-18 | 2022-01-28 | 安徽蓝讯通信技术有限公司 | Sub-6G-LTCC radio frequency front end microsystem module |
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| CN113992224A (en) * | 2021-10-18 | 2022-01-28 | 安徽蓝讯通信技术有限公司 | Sub-6G-LTCC radio frequency front end microsystem module |
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