CN104779918B - X Ka frequency ranges upconverter and its up-conversion method - Google Patents
X Ka frequency ranges upconverter and its up-conversion method Download PDFInfo
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Abstract
The present invention, which provides a kind of X Ka frequency ranges upconverter and its up-conversion method, X Ka frequency range upconverter therein, to be included：One-level converter unit, for the signal of the X frequency ranges of input to be carried out into up-conversion；Wherein, one-level converter unit also includes shunt, for the signal after up-conversion to be carried out into branch；Wherein, shunt separate wherein signal is the input signal of two level converter unit all the way, the another way signal separated directly exports；Two level converter unit, the input signal for shunt to be separated carry out up-conversion and exported after accessing；Controller, for being controlled to one-level converter unit and two level converter unit.The signal up-conversion of X frequency ranges to Ka frequency ranges so as to realize that Ka two-bands export, while can also be realized by the Miniaturization Design of upconverter by the present invention.
Description
Technical Field
The invention relates to the technical field of satellite data ground receiving system equipment links, in particular to an X-Ka frequency band up-converter of a satellite data ground receiving system and an up-conversion method thereof.
Background
With the progress of the earth observation technology, the data volume required to be transmitted by the satellite-earth link is larger and larger, the information code rate is higher and higher, and therefore, the occupied bandwidth is wider and wider.
In an uplink signal link of a ground observation satellite data ground receiving system, encoding, modulation, filtering and the like of signals are generally carried out at an intermediate frequency, then the frequency is moved to a higher frequency band through an up-converter, and finally the signals are accessed to a low-noise amplifier, amplified and fed to a receiving end of a transmitting antenna, so that simulation of downlink signals is realized. The up-converter is used as a key device of the satellite ground data receiving system uplink, and the performance of the up-converter directly affects the performance index of the uplink and also affects the detection level of the channel link.
As the existing earth observation satellite data is generally downloaded by adopting an S/X frequency band, and a corresponding ground receiving system is also built on the basis of the S/X frequency band. In order to solve the contradiction between the remote sensing information and the data transmission capability of the satellite-ground link, the aerospace mission at home and abroad at the present stage is also changed from the present S/X frequency band to the Ka frequency band. However, there is no in-orbit low-orbit Ka band remote sensing satellite, so if the Ka band is used to download satellite data, the corresponding equipment of the ground receiving system needs to be upgraded. In the construction and the upgrade of a remote sensing satellite data receiving system, higher and updated technical requirements are put forward for the development of an up-converter of an uplink. In addition, in the calibration test process of the receiving system, the requirement on portability design of the up-converter is more prominent due to the fact that field test is involved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an X-Ka band up-converter and an up-conversion method thereof, so as to up-convert the signal of the X band to the Ka band, thereby realizing the Ka dual-band output and the miniaturized design of the up-converter.
The invention provides an X-Ka frequency band up-converter, comprising: the first-stage frequency conversion unit is used for carrying out up-conversion on the input signals of the X frequency band; the first-stage frequency conversion unit also comprises a splitter which is used for splitting the up-converted signal; one path of signals split by the splitter is input signals of the secondary frequency conversion unit, and the other split path of signals is directly output; the second-stage frequency conversion unit is used for carrying out up-conversion and output after the input signal separated by the shunt is accessed; and the controller is used for controlling the first-stage frequency conversion unit and the second-stage frequency conversion unit.
Wherein, one-level frequency conversion unit includes: the first processing module is used for processing and outputting the input signals of the X frequency band through a filter, an attenuator and an amplifier; the first frequency mixer is used for mixing the signal output by the first processing module with a primary local oscillator of a Ka frequency band; the second processing module is used for accessing and filtering the signal mixed by the first mixer through the second selective control switch and outputting a Ka frequency band 1 signal through the third selective control switch; the third processing module is used for processing the Ka frequency band 1 signal output by the third selection control switch through an amplifier, an attenuator and a filter and then inputting the processed signal into the shunt; and the controller controls the local oscillation point frequency of the first-level local oscillation and the second and third selection control switches according to the network configuration instruction.
Wherein, second grade frequency conversion unit includes: the first selection control switch is used for selecting, controlling and accessing one path of signals divided by the splitter; the fourth processing module is used for performing gain adjustment processing on the signal accessed by the first selection control switch through the amplifier and outputting the signal; the second frequency mixer is used for mixing the signal output by the fourth processing module with the secondary local oscillator of the Ka frequency band; the fifth processing module is used for processing the signal output by the second mixer through a filter, an amplifier and an attenuator and then outputting a Ka frequency band 2 signal; and the controller controls the local oscillation point frequency of the secondary local oscillation and the first selective control switch according to the network configuration instruction.
On the other hand, the invention provides an up-conversion method of an X-Ka frequency band up-converter, wherein the up-converter is the up-converter; the up-conversion method of the up-converter comprises the following steps:
the first-stage frequency conversion unit and the second-stage frequency conversion unit are controlled by a controller; in the first-stage frequency conversion unit, an input signal of an X frequency band is subjected to up-conversion through the first-stage frequency conversion unit, and then is subjected to shunting through a shunt in the first-stage frequency conversion unit; one of the divided signals of the branching unit is accessed to the secondary frequency conversion unit through the first selective control switch, and the other divided signal is directly output; in the second-stage frequency conversion unit, the second-stage frequency conversion unit carries out up-conversion on the signal accessed by the first selective control switch and outputs a Ka frequency band 2 signal.
By utilizing the X-Ka frequency band up-converter and the up-conversion method thereof, signals of the X frequency band can be up-converted to the Ka frequency band, so that Ka dual-frequency band output is realized, and the miniaturization design of the up-converter can be realized.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a block diagram of a first logic structure of an X-Ka band up-converter according to an embodiment of the present invention;
fig. 2 is a block diagram of a second logic structure of the X-Ka band up-converter according to the embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an up-converter for X-Ka frequency band according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first-stage local oscillation circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a two-stage local oscillation circuit according to an embodiment of the present invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The up-converter of the existing satellite data ground receiving system of Ka frequency band has the problems of large equipment scale, low performance and the like. The invention can realize the up-conversion of the X-Ka frequency band signal through the two-stage frequency conversion module, and can also realize the Ka dual-frequency band output and the miniaturization design of the up-converter.
The following describes the X-Ka band up-converter provided by the present invention with reference to fig. 1 and fig. 2. Fig. 1 shows a first logic structure of an X-Ka band up-converter according to an embodiment of the present invention; fig. 2 shows a second logical structure block diagram of an X-Ka band up-converter according to an embodiment of the present invention.
As shown in fig. 1, the X-Ka band upconverter 100 provided in the present invention includes: a primary frequency conversion unit 110, a secondary frequency conversion unit 120 and a controller 130.
The first-stage frequency conversion unit 110 is configured to perform up-conversion on an input signal in an X frequency band; wherein, the splitter in the first-stage frequency conversion unit 110 splits the up-converted signal; one of the split signals is an input signal of the secondary frequency conversion unit 120, and the other split signal is directly output as a Ka band 1 signal; one of the signals split by the splitter is accessed to the secondary frequency conversion unit 120 and is subjected to up-conversion to output a Ka frequency band 2 signal; the controller 130 controls the primary frequency conversion unit 110 and the secondary frequency conversion unit 120.
Specifically, as shown in fig. 2, the one-stage frequency conversion unit 110 includes: a first processing module 111, a first mixer 112, a second selective control switch, a third processing module 113 and a splitter. The first processing module 111 processes the input signal of the X frequency band through a filter, an attenuator and an amplifier and outputs the processed signal; the first frequency mixer is used for mixing the signal output by the first processing module 111 with a first-level local oscillator of a Ka frequency band; the signal mixed by the first mixer 112 is accessed through the second selection control switch, and then is filtered by the filter, and a Ka frequency band 1 signal is output through the third selection control switch; that is, the second processing module performs filtering processing on the signal accessed by the second selective control switch, and then the third selective control switch outputs the Ka frequency band 1 signal after filtering processing; the third processing module 113 processes the Ka band 1 signal output by the third selection control switch through an amplifier, an attenuator and a filter and inputs the processed Ka band 1 signal to the splitter; the controller can control the local oscillation point frequency of the first-level local oscillation and the second and third selection control switches according to the network configuration instruction.
The two-stage frequency conversion unit 120 includes a first selection control switch, a fourth processing module 121, a second mixer 122, and a fifth processing module 123. The first selective control switch is used for selectively accessing one of the signals split by the splitter to the secondary frequency conversion unit 120, that is, one of the signals split by the splitter is accessed to the secondary frequency conversion unit 120 through the first selective control switch; the fourth processing module 121 performs gain adjustment processing on the signal selectively controlled and accessed by the first selective control switch through the amplifier and outputs the signal; the second frequency mixer 122 mixes the signal output by the fourth processing module with the secondary local oscillator of the Ka frequency band; the fifth processing module 123 processes the signal output by the second mixer through a filter, an amplifier and an attenuator and outputs a Ka band 2 signal; the controller can control the local oscillation point frequency of the second-level local oscillation and the first selective control switch according to the network configuration instruction.
As an example of the invention, the input signal of the X frequency band is 8.45GHz +/-500 MHz, the primary local oscillator has three local oscillator spot frequencies which are respectively 10.05GHz, 10.55GHz and 11.05GHz, after the frequency mixing is carried out by the first frequency mixer 112, the 8.45GHz +/-500 MHz can be shifted to 18 GHz-19 GHz, 18.5 GHz-19.5 GHz and 19 GHz-20 GHz, and the primary Ka frequency band signal output is realized.
Specifically, an input signal of the X frequency band is subjected to frequency mixing with three spot frequencies of a primary local oscillator after being processed by a filter, an attenuator and an amplifier, and a controller controls the local oscillator spot frequency of the primary local oscillator, a second selective control switch and a third selective control switch according to configuration, so that the frequency mixing and filtering functions of a primary frequency conversion unit are realized. The mixed signal is amplified, filtered and attenuated adjustably before entering the splitter. One path of the splitter outputs 18 GHz-20 GHz Ka-band radio-frequency signals (namely Ka-band 1 signals), and the other path of the splitter is connected into the second-stage frequency conversion unit 120 through the first selective switch.
The fourth processing module 121 amplifies the signal accessed by the first selection control switch, mixes the amplified signal with a second-level local oscillator having 7GHz and 7.5GHz, and then outputs a Ka band 2 signal of 25GHz to 27.5GHz after filtering, amplifying and attenuating the mixed signal.
In addition, the invention is provided with isolators at the front ends of the first processing module, the first mixer, the second processing module and the first selection control switch (namely, the input end of each module).
To further illustrate the X-Ka band up-converter provided by the present invention, the X-Ka band up-converter is described in more detail by way of example with reference to fig. 3 and 4.
The invention enables main technical indexes such as image rejection, out-of-band rejection, noise coefficient, input/output standing wave ratio, 1db compression point, group delay, amplitude flatness, local oscillator phase noise, reliability and the like to meet the design requirements of an uplink of a terrestrial observation satellite data terrestrial receiving system.
The main technical indexes of the invention are as follows: input frequency: 7.95 GHz-8.95 GHz; output frequency: 18 GHz-20 GHz, 25 GHz-27.5 GHz; gain controllable range: 0-20 dB, 1dB stepping; the image rejection is more than or equal to 60 dBc; the out-of-band rejection is more than or equal to 50 dBc; the noise coefficient is less than or equal to 16 dB; input/output standing wave ratio: 1.5: 1; the 1dB compression point is more than or equal to +5 dBm; group delay: 2ns (peak-to-peak); the amplitude flatness is less than or equal to 2dB (within an output frequency band); the phase noise of the vibration source is less than or equal to-70 dBc/Hz @100Hz or less than or equal to-85 dBc/Hz @1KHz or less than or equal to-95 dBc/Hz @10KHz or less than or equal to-105 dBc/Hz @100KHz or less than or equal to-115 dBc/Hz @1 MHz.
According to the analysis and function distribution of the technical indexes, the X-Ka frequency band up-converter provided by the invention is provided with Ka signal output of various frequency bands, so that the power consumption and the actual use requirements are considered in the framework design, the Ka link of a high frequency band can be remotely controlled by a controller to realize the on/off of the power supply of the equipment, and the signal output is controlled by a switch. Specifically, fig. 3 shows a circuit configuration of an X-Ka band up-converter according to an embodiment of the present invention.
As shown in fig. 3, the X-Ka band up-converter provided by the present invention can output the X band signal in the Ka dual band through the two-stage frequency conversion structure. Wherein, the first-stage frequency conversion structure (i.e. the first-stage frequency conversion unit 110) outputs 18 GHz-20 GHz Ka-band radio-frequency signals, and the second-stage frequency conversion structure (i.e. the second-stage frequency conversion unit 120) outputs 25 GHz-27.5 GHz Ka-band radio-frequency signals.
Specifically, the first-stage frequency conversion structure performs frequency mixing on an input signal in the X frequency band and a local oscillation signal in the Ka frequency band after the input signal in the X frequency band is isolated by an isolator, filtered by a filter, attenuated by an attenuator and amplified by an amplifier, and then outputs the signal after the frequency mixing after the amplification, the attenuation and the filtering.
In the first-stage frequency conversion structure, the frequency of an input X-band signal is 8.45GHz +/-500 MHz, a 12.3V voltage is applied to the 8.45GHz +/-500 MHz signal, and the signal is mixed with a first-stage local oscillator in a Ka frequency band after being processed by an isolator, a filter, an attenuator and an amplifier. Wherein, the first-stage local oscillation is three local oscillation point frequencies of 10.05GHz, 10.55GHz and 11.05 GHz. 8.45GHz +/-500 MHz can be shifted to 18 GHz-19 GHz, 18.5 GHz-19.5 GHz and 19 GHz-20 GHz through frequency mixing, signals in three frequency ranges of 18 GHz-19 GHz, 18.5 GHz-19.5 GHz and 19 GHz-20 GHz after frequency mixing are selected by a controller through control of a selection switch, and then enter a shunt after amplification, adjustable attenuation and filtering, so that the output of Ka frequency band radio frequency signals of 18 GHz-20 GHz is realized. One path of 18 GHz-20 GHz Ka-band radio-frequency signal of the splitter is directly output, and the other path of 18 GHz-20 GHz Ka-band radio-frequency signal split by the splitter is used as the input end of the secondary frequency conversion unit.
Specifically, the other path of 18 GHz-20 GHz Ka band radio frequency signal split by the splitter is accessed and processed by the selection switch, the processed signal is mixed with a secondary local oscillator (secondary local oscillator frequency points are 7GHz and 7.5GHz) of the Ka band, and the mixed signal is filtered, amplified and attenuated to output a 25 GHz-27.5 GHz Ka band radio frequency signal.
As shown in fig. 3, the input-side isolator can ensure a good input standing wave, and the output standing wave is ensured by good matching and careful tuning between circuits. The preselection band-pass filter filters out extraneous interference outside the band, ensures the image frequency suppression index and filters the return leakage of the local oscillator. The filter has the suppression of over 75dBc to the local oscillation frequency, and the 35dBc suppression of the mixer, the return isolation of 50dBc is totally performed by the 2-level isolator, and the local oscillation leakage of the input port can be ensured to be below-80 dBm. The input front end is provided with a numerical control attenuator, and the attenuator is arranged in an attenuation state when a large signal is input, so that the saturation of an amplifier and a mixer is avoided, and the input dynamic range of the whole machine is ensured. The amplifier selects an amplifier with high gain, high third order and low noise coefficient, and has good flatness index in an application frequency band.
The front end of the mixer is provided with an isolator, so that standing waves of the mixer are improved to a certain extent, matching effect is achieved, and indexes such as in-band flatness are guaranteed. The mixer selects a double-balanced mixer, has better inhibition to even combined frequency and has good characteristics in the range of application frequency band. Meanwhile, other devices selected by the link have good flatness indexes on corresponding frequency bands, and in addition, the indexes of in-band flatness can be ensured through careful debugging. The 8.45GHz +/-500 MHz frequency band is shifted to the frequency band ranges of 18 GHz-19 GHz, 18.5 GHz-19.5 GHz and 19 GHz-20 GHz by the mixing through 3 point frequency local oscillators. It is calculated that the 7 < th > order combined spurs fall out of band. Spurious suppression can be guaranteed to be above 60 dBc.
When the frequency conversion of 25 GHz-27.5 GHz is started, the main power supply is started first through remote control, then the switch of the radio frequency input end is opened, and the local oscillator is started. This frequency conversion adopts low local oscillator 7GHz or 7.5GHz, and the user can set up by oneself according to the use needs.
The frequency conversion channel mainly comprises an amplifier, a mixer, a filter and the like. The amplifier and mixer have a small group delay impact on the frequency converted channel, typically on the order of tens of ps (Picosecond). The group delay characteristics of the frequency converted channel are mainly determined by the filters in the channel. The group delay characteristics of the filter are mainly related to the order, pass band and attenuation change at stop band transition. Generally, the larger the bandwidth of the filter is, the better the group delay characteristic is, and considering the requirement of out-of-band rejection, the bandwidth cannot be too wide, so that the filter needs to be designed reasonably according to the delay characteristic of the signal group, and details are not repeated here.
As the design of the radio frequency filter requires that the in-band group delay fluctuation is less than or equal to 0.5ns, and the 24-hour absolute delay variation is less than or equal to 1ns, the in-band group delay fluctuation of the filter is 1ns-0.7 ns-0.3 ns from the viewpoint of simulation results, so that the design requirement is met.
The intermediate frequency filter requires that the group delay fluctuation in a 1000MHz band is less than or equal to 0.8ns, and the absolute delay change in 24 hours is less than or equal to 1 ns. Through simulation, the group delay fluctuation in the intermediate frequency filter band is 3.1ns-2.8 ns-0.3 ns. The frequency conversion channel comprises a 1-stage radio frequency filter and a 2-stage intermediate frequency filter, so that the group delay fluctuation of the whole channel is better than 0.3ns +0.33ns x 2-0.9 ns.
Analysis of the simulation result of the circuit structure shown in fig. 3 shows that the technical indexes such as gain, output P-1dB, noise coefficient and the like all meet the design requirements of the ground observation satellite data ground receiving system uplink.
The X-Ka up-converter of the invention provides two-stage local oscillation signals. The primary local oscillators are three local oscillation point frequencies of 10.05GHz, 10.55GHz and 11.05GHz, and the secondary local oscillators are 7GHz and 7.5GHz, and are all realized in a phase-locked loop mode. To illustrate two-stage local oscillator signals of the X-Ka upconverter of the present invention, fig. 4 and 5 respectively show local oscillator circuit structures according to embodiments of the present invention. Fig. 4 shows a first-stage local oscillation circuit structure according to an embodiment of the present invention.
For example, in fig. 4, a 100MHz constant temperature crystal oscillator is used as a phase-locked loop as a reference clock, 50MHz is used as a phase detection frequency, and an integer N frequency division phase-locked outputs a local oscillation frequency. The phase-locked chip adopts HMC704 of HITTITE, and the normalized noise floor of the phase-locked chip is-230 dBc/Hz. The VCO (Voltage Controlled Oscillator) is HMC513, which has the characteristics of wide frequency band and low phase noise, and the frequency can cover 10000-11500 MHz. The loop filter adopts the low-noise operational amplifier AD797 to form an active loop filter, and the deterioration of the operational amplifier to phase noise can be well reduced. According to phase-locked loop theory, the selection of the optimal loop bandwidth is determined based on the phase noise figure of the reference crystal and the VCO. The optimal loop bandwidth for this project is chosen to be 500 kHz.
The in-band phase noise can be estimated by the formula PN tot +10logFpfd +20logN, the deterioration of the phase noise in the circuit in practical application is considered as 5dB, 1MHz is out of the loop bandwidth, and the phase noise of the VCO is subtracted by the deterioration value. Through calculation, the theoretical value of the phase noise can reach: -86dBc/Hz @100Hz, -102dBc/Hz @1kHz, -111dBc/Hz @10kHz, -113dBc/Hz @100kHz, -118dBc/Hz @1 MHz.
Fig. 5 shows a two-stage local oscillation circuit structure according to an embodiment of the present invention, where an analysis and calculation method of the two-stage local oscillation principle shown in fig. 5 is similar to the analysis and calculation method of the one-stage local oscillation principle shown in fig. 4, and is not described herein again. By calculating the structure of the second-level local oscillation circuit shown in fig. 5, the theoretical value of the phase noise is obtained: -90dBc/Hz @100Hz, -105dBc/Hz @1kHz, -115dBc/Hz @10kHz, -117dBc/Hz @100kHz, -120dBc/Hz @1 MHz.
Through the calculation of the phase noise of the first-stage local oscillator and the second-stage local oscillator, the local oscillator phase noise index of the X-Ka up-converter provided by the invention also meets the design requirement of an uplink of a ground observation satellite data ground receiving system.
In addition, the power interface of the X-Ka up-converter provided by the invention is provided with an anti-reverse circuit and an overvoltage and overcurrent protection circuit, so that surge and static electricity can be well prevented, and the reliability and stability of the system can be effectively ensured. The external supply voltage is: feeding +15V/2A for direct power supply; an internal power supply: +12.3V/2A, + 5.3V/2A.
It should be noted that the X-Ka band up-converter provided by the present invention can not only realize Ka band radio frequency signals of 18GHz to 20GHz and 25GHz to 27.5GHz, but also up-convert the signals of the X band to the Ka band by mixing the input signals of different X bands with different local oscillation signals, thereby realizing output of other radio frequency signals in the Ka band, and details are not repeated herein.
On the other hand, the invention also provides an up-conversion method of the X-Ka frequency band up-converter. Wherein, the up-converter is the up-converter shown in fig. 1 to fig. 5, and the up-conversion method includes:
the first-stage frequency conversion unit and the second-stage frequency conversion unit are controlled by a controller; in the first-stage frequency conversion unit, an input signal of an X frequency band is subjected to up-conversion through the first-stage frequency conversion unit, and then is subjected to shunting through a shunt in the first-stage frequency conversion unit; one of the divided signals of the branching unit is accessed to the secondary frequency conversion unit through the first selective control switch, and the other divided signal is directly output; in the second-stage frequency conversion unit, the second-stage frequency conversion unit performs up-conversion on the signal accessed by the first selective control switch and outputs the signal.
Specifically, the up-conversion method of the first-stage frequency conversion unit includes: the input signal of the X frequency band is output after being filtered, attenuated and amplified through a first processing module; mixing the signal output by the first processing module with a first-level local oscillator of a Ka frequency band through a first mixer; the controller controls local oscillation point frequency of the first-level local oscillation according to configuration; the second processing module accesses and filters the signals mixed by the first mixer through the second selective control switch, and then outputs Ka frequency band 1 signals through the third selective control switch; amplifying, attenuating and filtering the Ka frequency band 1 signal output by the third selective control switch through a third processing module, and then inputting the signal into a shunt; the controller can control the local oscillation point frequency of the first-level local oscillation and the second and third selection control switches according to the network configuration instruction.
The up-conversion method of the two-stage frequency conversion unit comprises the following steps: one of the signals split by the shunt is accessed through a first selective control switch; amplifying and outputting the signal accessed by the first selection control switch through a fourth processing module; mixing the signal output by the fourth processing module with a secondary local oscillator of the Ka frequency band through a second mixer; the controller controls local oscillation point frequency of the secondary local oscillation according to configuration; filtering, amplifying and attenuating the signal output by the second mixer through a fifth processing module, and outputting a Ka frequency band 2 signal; the controller can control the local oscillation point frequency of the second-level local oscillation and the first selective control switch according to the network configuration instruction.
The X-Ka band up-converter and the up-conversion method thereof according to the present invention are described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the above-described X-Ka band up-converter and up-conversion method thereof without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (8)
1. An X-Ka band up-converter comprising:
the primary frequency conversion unit is used for up-converting an input signal of an X frequency band to a Ka frequency band; the input signal of the X frequency band is 8.45GHz +/-500 MHz, and the primary frequency conversion unit further comprises a splitter for splitting the Ka frequency band radio-frequency signal of 18 GHz-20 GHz after up-conversion; wherein,
one path of Ka frequency band radio frequency signal divided by the splitter is an input signal of the secondary frequency conversion unit, and the other path of the divided Ka frequency band radio frequency signal is directly output;
the secondary frequency conversion unit is used for performing up-conversion on the input signal split by the splitter after the input signal is accessed, and outputting a Ka frequency band radio frequency signal of 25 GHz-27.5 GHz;
the controller is used for controlling the primary frequency conversion unit and the secondary frequency conversion unit; wherein,
and the controller controls the local oscillation point frequency of the primary local oscillation of the Ka frequency band and the local oscillation point frequency of the secondary local oscillation of the Ka frequency band according to the network configuration instruction.
2. The X-Ka band up-converter of claim 1, wherein the primary frequency conversion unit comprises:
the first processing module is used for processing and outputting the input signals of the X frequency band through a filter, an attenuator and an amplifier;
the first frequency mixer is used for mixing the signal output by the first processing module with a primary local oscillator of a Ka frequency band;
the second processing module is used for accessing and filtering the signal mixed by the first mixer through a second selective control switch and outputting a Ka frequency band 1 signal through a third selective control switch;
the third processing module is used for processing the Ka frequency band 1 signal output by the third selective control switch through an amplifier, an attenuator and a filter and then inputting the processed Ka frequency band 1 signal into the splitter;
and the controller controls the second and third selective control switches according to a network configuration instruction.
3. The X-Ka band up-converter of claim 2, wherein the two-stage frequency conversion unit comprises:
the first selection control switch is used for selecting and controlling one path of signals divided by the access branching unit;
the fourth processing module is used for carrying out gain adjustment processing on the signals selectively controlled and accessed by the first selective control switch through an amplifier and then outputting the signals;
the second frequency mixer is used for mixing the signal output by the fourth processing module with a secondary local oscillator of a Ka frequency band;
the fifth processing module is used for processing the signal output by the second mixer through a filter, an amplifier and an attenuator and then outputting a Ka frequency band 2 signal;
and the controller controls the first selective control switch according to a network configuration instruction.
4. The X-Ka band up-converter according to claim 3, wherein isolators are respectively disposed at front ends of the first processing module, the first mixer, the second processing module, and the first selective switch.
5. The X-Ka frequency band up-converter according to claim 2, wherein the primary local oscillator comprises three local oscillator spot frequencies; the second-level local oscillator comprises two local oscillator spot frequencies.
6. An up-conversion method of an X-Ka frequency band up-converter, wherein the up-converter is the up-converter according to any one of claims 1 to 5; the up-conversion method comprises the following steps:
the first-stage frequency conversion unit and the second-stage frequency conversion unit are controlled by a controller; the controller controls local oscillation point frequency of a primary local oscillation of the Ka frequency band and local oscillation point frequency of a secondary local oscillation of the Ka frequency band according to a network configuration instruction;
in the primary frequency conversion unit, after an input signal with an input X-frequency band signal of 8.45GHz +/-500 MHz is subjected to up-conversion by the primary frequency conversion unit, a splitter in the primary frequency conversion unit is used for splitting an up-converted Ka-frequency band radio-frequency signal of 18 GHz-20 GHz; one path of Ka frequency band radio frequency signals separated by the splitter is accessed to the secondary frequency conversion unit through a first selective switch, and the other path of separated Ka frequency band radio frequency signals is directly output;
in the secondary frequency conversion unit, the secondary frequency conversion unit carries out up-conversion on the signal accessed by the first selection control switch and outputs a Ka frequency band radio frequency signal of 25 GHz-27.5 GHz.
7. The up-conversion method of an X-Ka band up-converter as claimed in claim 6,
the up-conversion method of the first-stage frequency conversion unit comprises the following steps:
the input signal of the X frequency band is output after being filtered, attenuated and amplified through a first processing module;
mixing the signal output by the first processing module with a first-level local oscillator of a Ka frequency band through a first mixer; the controller controls the local oscillation point frequency of the first-level local oscillation according to configuration;
the second processing module accesses and filters the signals mixed by the first mixer through a second selective control switch, and then outputs Ka frequency band 1 signals through a third selective control switch;
the controller controls the second and third selective control switches according to a network configuration instruction;
and amplifying, attenuating and filtering the Ka frequency band 1 signal output by the third selective control switch through a third processing module, and then inputting the signal into the shunt.
8. The up-conversion method of an X-Ka band up-converter as claimed in claim 7,
the up-conversion method of the two-stage frequency conversion unit comprises the following steps:
one path of signals split by the splitter is accessed through the first selective control switch;
amplifying and outputting the signal accessed by the first selective control switch through a fourth processing module;
mixing the signal output by the fourth processing module with a secondary local oscillator of a Ka frequency band through a second mixer; the controller controls the local oscillation point frequency of the secondary local oscillation according to configuration;
filtering, amplifying and attenuating the signal output by the second mixer through a fifth processing module, and outputting a Ka frequency band 2 signal;
and the controller controls the first selective control switch according to a network configuration instruction.
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| CN101242158A (en) * | 2008-03-07 | 2008-08-13 | 华中科技大学 | A configurable and reconstructable dynamic frequency mixer |
| CN103957047A (en) * | 2014-05-12 | 2014-07-30 | 北京遥测技术研究所 | Miniaturized channel with low power consumption at Ka frequency band |
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| CN101242158A (en) * | 2008-03-07 | 2008-08-13 | 华中科技大学 | A configurable and reconstructable dynamic frequency mixer |
| CN103957047A (en) * | 2014-05-12 | 2014-07-30 | 北京遥测技术研究所 | Miniaturized channel with low power consumption at Ka frequency band |
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