CN106253966B - A kind of TT&C Transponder that spaceborne S and X band link is restructural - Google Patents
A kind of TT&C Transponder that spaceborne S and X band link is restructural Download PDFInfo
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- CN106253966B CN106253966B CN201610605497.9A CN201610605497A CN106253966B CN 106253966 B CN106253966 B CN 106253966B CN 201610605497 A CN201610605497 A CN 201610605497A CN 106253966 B CN106253966 B CN 106253966B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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Abstract
A kind of TT&C Transponder that spaceborne S and X band link is restructural, signal all the way will be merged into intermediate frequency after two S frequency range, X frequency range uplink signal down coversions with a receiving channel and carry out AGC amplification filtering, give digital processing circuit and remote signal and distance measuring signal are captured and demodulated；Digital processing software controls the local frequency of receiving channel and transmission channel according to S frequency range, the calculating of the coincidence frequency of X frequency range simultaneously, and gives telemetered signal and forwarding distance measuring signal to transmission channel；It is calculated simultaneously by software and carries out local oscillator frequency point setting, it is realized with a transceiver channel and is reconstructed in S frequency range, X frequency range uplink downlink, reduce the weight, volume and power consumption of product, meet the observing and controlling demand of moon repeater satellite, the tracking and measurement of satellite are completed using S, X frequency range under unified carrier system, with uplink downlink recombination function, uplink and downlink signals frequency is changed according to instruction, meets the forward direction and return link demand of lunar rover.
Description
Technical field
The present invention relates to a kind of TT&C Transponders that spaceborne S and X band link is restructural, belong to Satellite observation control technology
Field.
Background technique
In recent years, China is by goddess in the moon's series of satellites persistently to probing into the moon, and wherein No. three satellites of the goddess in the moon carry
Lunar rover, which has successfully landed, carries out detection operations on the moonscape in face of the earth.But up to now, do not have also in the world
There is country to carry out detection operations for the privately face of the moon.No. four satellites of the goddess in the moon that China develops are realized for the first time by lunar rover is carried
For the mankind to the back ground location of the moon, the communication on lunar rover and ground needs moon repeater satellite to carry out data forwarding.
The TT&C Transponder major function of moon repeater satellite is that the telecommand for receiving ground is transmitted to lunar rover,
The telemetry of lunar rover is forwarded back to ground simultaneously.TT&C Transponder generally uses S frequency range and ground to carry out telemetry communication, makes
Telemetry communication is carried out with X frequency range and lunar rover, it is possible to use S frequency range and X frequency range carry out telemetry communication with ground simultaneously, are needing
When can also will change S frequency range, X frequency range uplink and downlink frequency point, realize uplink downlink reconstruct.
Existing S and X deep space answering machine, the answering machine can only be worked under S or X frequency range by switching, can not be simultaneously
S and X frequency range uplink signal is received, and working frequency is fixed, cannot achieve uplink downlink reconstruct.And the existing each frequency of answering machine
It integrates before Duan Douyou to two transceiver channel, back transceiver channel channels to realize LINK RECONFIGURATION.
Above mentioned answering machine, be unable to satisfy moon repeater satellite to answering machine propose can simultaneously S and X frequency
The lower work of section, weight, volume and power consumption are minimum, i.e., the forward direction and back of S and X frequency range can be established with simplest design scheme
Link is realized over the ground, to the TT&C task demand of the moon.
Summary of the invention
Present invention solves the technical problem that being：It overcomes the shortage of prior art, proposes that a kind of spaceborne S and X band link can weigh
The TT&C Transponder of structure, establishing to, return link before solving the problems, such as S and X frequency range with one group of reception and transmission channel, so that
The conceptual design of answering machine is simpler, meets weight, volume and power consumption requirements that moon repeater satellite proposes answering machine.
The technical scheme is that：A kind of TT&C Transponder that spaceborne S and X band link is restructural, including receive logical
Road part, digital base band processor part and transmission channel part；
Receiving channel part, including：S lower frequency changer circuit, S receive local oscillation circuit, X lower frequency changer circuit, X and receive local oscillation circuit
And intermediate frequency AGC amplifying circuit；
Received S uplink signal (including S is remotely controlled subcarrier signal, S distance measuring signal) is carried out low noise by S lower frequency changer circuit
Amplification, and be mixed under being carried out with the S signal for receiving local oscillation circuit output, using bandpass filtering, the first intermediate-freuqncy signal is exported, is made
It send for the output of S lower frequency changer circuit to intermediate frequency AGC amplifying circuit；
S receives local oscillation circuit and receives the S reception local frequency control signal that S coincidence frequency computing module is sent, which receives
Local frequency control signal can as needed be changed the S signal frequency for receiving local oscillation circuit output, keep S down coversion electric
First IF signal frequency of road output is fixed；(preferably 70M~140MHz)
Received X uplink signal is carried out low noise amplification by X lower frequency changer circuit, and the letter of local oscillation circuit output is received with X
Number lower mixing is carried out, using bandpass filtering, exports the second intermediate-freuqncy signal, the output as X lower frequency changer circuit is sent to intermediate frequency AGC
Amplifying circuit；
X receives local oscillation circuit and receives the X reception local frequency control signal that X coincidence frequency computing module is sent, which receives
Local frequency control signal can as needed be changed the X signal frequency for receiving local oscillation circuit output, keep X down coversion electric
Second IF signal frequency of road output is fixed；(preferably 70M~140MHz)
The second of the first intermediate-freuqncy signal and X the lower frequency changer circuit output that intermediate frequency AGC amplifying circuit exports S lower frequency changer circuit
By automatic growth control AGC after intermediate-freuqncy signal combining, the power control of the intermediate-freuqncy signal after making combining is in -10dBm~10dBm
In range, using the bandpass filtering of 9M band above, output simulation combining intermediate-freuqncy signal is sent to digital base band processor part
ADC；
Digital base band processor part, including analog digital converter ADC, the first digital to analog converter DAC1, the second number
Word analogue converter DAC2, FPGA；
FPGA includes：S IF signal processing part, X IF signal processing part；
S IF signal processing part, including：S quadrature frequency conversion module, S loop filtering module, S capturing carrier track mould
Block, S remote control subcarrier demodulation module, S ranging demodulation and forwarding module, digital vco NCO1, S coincidence frequency calculate mould
Block；
X IF signal processing part, including：X quadrature frequency conversion module, X loop filtering module, X capturing carrier track mould
Block, X remote control subcarrier demodulation module, X ranging demodulation and forwarding module, digital vco NCO2, X coincidence frequency calculate mould
Block；
Analog digital converter ADC, the simulation for receiving the output of intermediate frequency AGC amplifying circuit are combined intermediate-freuqncy signal, are adopted by AD
Sample is converted to number combining intermediate-freuqncy signal and is sent respectively to the S quadrature frequency conversion module of FPGA and X quadrature frequency conversion module；
S quadrature frequency conversion module, by the number of received number combining intermediate-freuqncy signal and digital vco NCO1 output
Word local oscillation signal carries out quadrature frequency conversion, forms S baseband signal and send to S loop filtering module；
S loop filtering module carries out loop filtering processing to S baseband signal, filters out after obtaining filtering after band stray signal
S baseband signal as the output of S loop filtering module send respectively to S capturing carrier tracking module and S ranging demodulation and forwarding
Module；
S capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered S baseband signal, will be with
The carrier frequency offset that track obtains gives S coincidence frequency computing module, and converts carrier frequency offset to the frequency of NCO1
Rate control word is sent to digital vco NCO1, while S capturing carrier tracking module is demodulated from filtered S baseband signal
S is remotely controlled subcarrier signal and gives S remote control subcarrier demodulation module out；
Digital vco NCO1 generates local quadrature carrier signals according to the frequency control word of the NCO1 received, makees
It send for the local oscillation signal of S quadrature frequency conversion module to S quadrature frequency conversion module；
S coincidence frequency computing module, the carrier frequency offset obtained according to S carrier track according to setting forwarding ratio
221/240 is calculated, and obtains the frequency offset control word of S transmitting local oscillator, while being calculated according to S uplink signal frequency
S emits the preset frequency control word of local oscillator, and the two, which is added to obtain S transmitting local oscillator actual frequency control word, to be sent to S and emit local oscillator mould
Block, while being given according to the actual frequency control word that S reception local oscillator is calculated in S uplink signal frequency to S and receiving local oscillator module；
S is remotely controlled subcarrier demodulation module and demodulates to S remote control subcarrier signal, obtains S remote signal and exports to outside；
The S baseband signal that S ranging demodulation and forwarding module send S loop filtering module demodulates, and obtains ranging letter
Number, and distance measuring signal is sent into the first digital to analog converter DAC1；
First digital to analog converter DAC1 will be after the S distance measuring signal that received and the modulation of externally input S telemetered signal
The S modulated intermediate frequency signal of generation is sent to the S intermediate frequency filtering amplifying circuit of transmission channel part；
X quadrature frequency conversion module, by the number of received number combining intermediate-freuqncy signal and digital vco NCO2 output
Word local oscillation signal carries out quadrature frequency conversion, forms X baseband signal and send to X loop filtering module；
X loop filtering module carries out loop filtering processing to X baseband signal, filters out after obtaining filtering after band stray signal
X baseband signal as the output of X loop filtering module send respectively to X capturing carrier tracking module and X ranging demodulation and forwarding
Module；
X capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered X baseband signal, will be with
The carrier frequency offset that track obtains gives X coincidence frequency computing module, and converts carrier frequency offset to the frequency of NCO2
Rate control word is sent to digital vco NCO2, while X capturing carrier tracking module is demodulated from filtered X baseband signal
X is remotely controlled subcarrier signal and gives X remote control subcarrier demodulation module out；
Digital vco NCO2 generates local quadrature carrier signals according to the frequency control word of the NCO2 received, makees
It send for the local oscillation signal of X quadrature frequency conversion module to X quadrature frequency conversion module；
X coincidence frequency computing module, the carrier frequency offset obtained according to X carrier track according to setting forwarding ratio
749/880 is calculated, and obtains the frequency offset control word of X transmitting local oscillator, while being calculated according to X uplink signal frequency
X emits the preset frequency control word of local oscillator, and the two, which is added to obtain X transmitting local oscillator actual frequency control word, to be sent to X and emit local oscillator mould
Block, while being given according to the actual frequency control word that X reception local oscillator is calculated in X uplink signal frequency to X and receiving local oscillator module；
X is remotely controlled subcarrier demodulation module and demodulates to X remote control subcarrier signal, obtains X remote signal and exports to outside；
The X baseband signal that X ranging demodulation and forwarding module send X loop filtering module demodulates, and obtains ranging letter
Number, and distance measuring signal is sent into the second digital to analog converter DAC2；
Second digital to analog converter DAC2 will be after the X distance measuring signal that received and the modulation of externally input X telemetered signal
The X modulated intermediate frequency signal of generation is sent to the X intermediate frequency filtering amplifying circuit of transmission channel part；
Transmission channel part, including S intermediate frequency filtering amplifying circuit, S up-converter circuit, S transmitting local oscillation circuit, the filter of X intermediate frequency
Wave amplifying circuit, X up-converter circuit, X emit local oscillation circuit；
The S modulated intermediate frequency signal for receiving DAC1 output is filtered by S intermediate frequency filtering amplifying circuit, filters out frequency modulation in S
The humorous clutter of signal processed obtains the pure S modulated intermediate frequency signal of frequency spectrum and gives S up-converter circuit using amplification；
S up-converter circuit will receive the pure S modulated intermediate frequency signal of frequency spectrum, carry out with the signal of S transmitting local oscillator output
Uppermixing generates the output of S downlink signal；
S transmitting local oscillator receives the S transmitting local frequency control signal that S coincidence frequency computing module is sent, which emits local oscillator
Frequency control signal can require the signal frequency to S transmitting local oscillation circuit output to be configured according to coherent forwarding, make to become on S
The S downstream signal frequencies of frequency circuit output meet the requirement of S frequency range coherent forwarding ratio；
The X modulated intermediate frequency signal for receiving DAC2 output is filtered by X intermediate frequency filtering amplifying circuit, filters out frequency modulation in X
The humorous clutter of signal processed obtains the pure X modulated intermediate frequency signal of frequency spectrum and gives X up-converter circuit using amplification；
X up-converter circuit will receive the pure X modulated intermediate frequency signal of frequency spectrum, carry out with the signal of X transmitting local oscillator output
Uppermixing generates the output of X downlink signal；
X transmitting local oscillator receives the X transmitting local frequency control signal that X coincidence frequency computing module is sent, which emits local oscillator
Frequency control signal can require the signal frequency to X transmitting local oscillation circuit output to be configured according to coherent forwarding, make to become on X
The X downstream signal frequencies of frequency circuit output meet the requirement of X frequency range coherent forwarding ratio；
The beneficial effect of the present invention compared with the existing technology is
(1) the first and second two intermediate-freuqncy signals are combined into center signal progress all the way in design by answering machine of the invention
Intermediate frequency AGC amplification filtering, not only ensure that S frequency range and X frequency range uplink signal can receive amplification simultaneously, but also reduce an intermediate frequency
AGC amplifying circuit simplifies receiving channel design, saves the weight, volume and power consumption of answering machine；
(2) answering machine of the invention does not need to increase channel hardware, is only received by receiving local oscillator, S transmitting local oscillator, X to S
Local oscillator, the frequency of X transmitting local oscillator are calculated and are arranged, and can realize that S frequency range and X frequency range uplink and downlink signals working frequency change
Become, meets the needs of moon relay satellite is to S frequency range and X frequency range uplink and downlink LINK RECONFIGURATION, save weight, the volume of answering machine
And power consumption；
(3) 12bit or more ADC is selected, it is ensured that analog and digital signal conversion quantified precision is sufficiently high, meets deep
Requirement of the sky detection to answering machine high sensitivity；An advantage is write for preferably every of claim 2~6
(4) DAC output signal frequency range is to guarantee under the premise of power consumption is not increased, as far as possible in 80~120MHz
Output signal frequency is improved, the band stray effect for filtering out transmission channel output signal is more preferable.
(5) S receives local oscillator, X receives the frequency control precision of local oscillator within 1MHz, it is ensured that on receiving any S
Filter in the case where row signal frequency value and X uplink signal frequency values, in the intermediate frequency AGC amplifying circuit of receiving channel part
It is suitable for, simplifies circuit design.
Detailed description of the invention
Fig. 1 is the restructural TT&C Transponder functional block diagram of S and X band link of the invention.
Specific embodiment
Basic ideas of the invention are：A kind of TT&C Transponder that spaceborne S and X band link is restructural is received with one
Channel will merge into signal all the way in intermediate frequency after two S frequency range, X frequency range uplink signal down coversions and carry out AGC amplification filtering, give
Digital processing circuit is captured and is demodulated to remote signal and distance measuring signal；Digital processing software is according to S frequency range, X frequency simultaneously
The coincidence frequency calculating of section controls the local frequency of receiving channel and transmission channel, and by telemetered signal and forwards ranging
Signal gives transmission channel；It is calculated simultaneously by software and carries out local oscillator frequency point setting, realized with a transceiver channel in S frequency range, X
The reconstruct of frequency range uplink downlink, reduces the weight, volume and power consumption of product, meets the observing and controlling demand of moon repeater satellite,
The tracking and measurement for completing satellite under unified carrier system using S, X frequency range, have uplink downlink recombination function, according to instruction
Change uplink and downlink signals frequency, meets the forward direction and return link demand of lunar rover.
TT&C Transponder of the invention with a receiving channel by after two S frequency range, X frequency range uplink signal down coversions in
Frequency merges into signal all the way and carries out AGC amplification filtering, gives digital processing circuit and captures to remote signal and distance measuring signal
And demodulation；Digital processing software calculates the sheet to receiving channel and transmission channel according to S frequency range, the coincidence frequency of X frequency range simultaneously
Vibration frequency is controlled, and gives telemetered signal and forwarding distance measuring signal to transmission channel；Transmission channel is by intermediate frequency baseband signal
Up-conversion generates two S frequency range, X frequency range downlink signals respectively.
The TT&C Transponder realizes S, X double mode with a receiving channel while carrying out reception demodulation, simplifies reception
Channel design；It is calculated simultaneously by software and carries out local oscillator frequency point setting, given and realized with a transceiver channel in S frequency range, X frequency
The new design of section uplink downlink reconstruct, greatly simplifies product design scheme, reduces the weight, volume and power consumption of product.
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, being the functional block diagram of this answering machine, working principle is as follows：
Such as S frequency range uplink input signal centre frequency is 2050MHz, power is -50dBm~-130dBm, using unified
The residual carrier linear phase modulation mode of carrier wave system is adjusted wherein the distance measuring signal bandwidth being modulated on main carrier is 2MHz
Making the remote control subcarrier signal frequency on main carrier is 8KHz, remote signal 2KHz.
The S uplink signal that received frequency is 2050MHZ is carried out low noise amplification by S lower frequency changer circuit, and receives this with S
The signal that vibration circuit output frequency is 1980MHz carries out lower mixing, and using bandpass filtering, exporting the first IF frequency is
The signal of 70MHz, the output as S lower frequency changer circuit are sent to intermediate frequency AGC amplifying circuit；
S receives local oscillation circuit and receives the S reception local frequency control signal that S coincidence frequency computing module is sent, which receives
Local frequency control signal can as needed be changed the S signal frequency for receiving local oscillation circuit output, keep S down coversion electric
First IF signal frequency of road output especially can choose in 70MHz~72MHz, so preferably within the scope of 70M~140M
ADC sample clock frequency can be reduced, ADC power consumption is reduced；
X frequency range uplink input signal centre frequency is 7150MHz, and power is -50dBm~-130dBm, using unified carrier
The residual carrier linear phase modulation mode of system is modulated at wherein the distance measuring signal bandwidth being modulated on main carrier is 4MHz
Remote control subcarrier signal frequency on main carrier is 8KHz, remote signal 2KHz.
The X uplink signal that received frequency is 7150MHz is carried out low noise amplification by X lower frequency changer circuit, and receives this with X
The signal that vibration circuit output frequency is 7074MHz carries out lower mixing, and using bandpass filtering, exporting the second IF frequency is
The signal of 76MHz, the output as X lower frequency changer circuit are sent to intermediate frequency AGC amplifying circuit；
X receives local oscillation circuit and receives the X reception local frequency control signal that X coincidence frequency computing module is sent, which receives
Local frequency control signal can as needed be changed the X signal frequency for receiving local oscillation circuit output, keep X down coversion electric
Second IF signal frequency of road output is typically chosen in 75MHz~79MHz within the scope of 70M~140M；
Intermediate frequency AGC amplifying circuit is electric by the first intermediate-freuqncy signal that S lower frequency changer circuit output frequency is 70MHz and X down coversion
By automatic growth control (AGC) detecting circuit after the second intermediate-freuqncy signal combining that road output frequency is 76MHz, automatic adjustment can
Attenuator circuit is controlled, by the intermediate-freuqncy signal power control of output within the scope of -10dBm~10dBm, using the band logical of 9M bandwidth
Filtering, output simulation combining intermediate-freuqncy signal are sent to the ADC of digital base band processor part；Analog digital converter ADC can generally be fitted
Answer power in -30dBm~10dBm intermediate-freuqncy signal, signal power is bigger, and the digital signal quality of ADC acquisition is better；Intermediate frequency
Bandpass filtering bandwidth in AGC amplifying circuit can either guarantee the main load of two-way intermediate-freuqncy signal generally within the scope of 9M~20MHz
Wave, remote control subcarrier and distance measuring signal can completely pass through, and can filter noise as much as possible, improve letter
Number and in-band noise power ratio.
Analog digital converter is ADC, the sampling clock 60MHz of 12bit, receives the output of intermediate frequency AGC amplifying circuit
74.5 ± 4.5MHz simulation combining intermediate-freuqncy signal is that number combining intermediate-freuqncy signal is sent respectively to the S of FPGA by AD sample conversion
Quadrature frequency conversion module and X quadrature frequency conversion module；The ADC of 12bit is selected to can satisfy signal power answering less than -130dBm
Machine sensitivity requirement is answered, the needs of deep space exploration are met；Sampling clock can according to actual needs round numbers such as 60MHz or contain decimal
Such as 60.5MHz, general integer frequency point is easy to produce.
S quadrature frequency conversion module, by received number combining 74.5 ± 4.5MHz of intermediate frequency signal and digital vco
The digital local oscillator signal of NCO1 output carries out quadrature frequency conversion, forms S baseband signal (comprising 100KHz, 16 or 20KHz, 8KHz
Signal) it send to S loop filtering module；
S loop filtering module carries out loop filtering processing to S baseband signal, filters out after obtaining filtering after band stray signal
S baseband signal (comprising 100KHz, 16 or 20KHz, 8KHz signal) as S loop filtering module output send respectively to S load
Wave acquisition and tracking module and S ranging demodulation and forwarding module；
S capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered S baseband signal, will be with
The carrier frequency offset that track obtains gives S coincidence frequency computing module, and converts carrier frequency offset to the frequency of NCO1
Rate control word (see formula 1) is sent to digital vco NCO1, while S capturing carrier tracking module is from filtered S base band
The S remote control subcarrier signal that frequency is 8KHz is demodulated in signal gives S remote control subcarrier demodulation module；
F in above formulanco1For NCO1 frequency control word, fp1For the carrier shift amount of S baseband signal, fclk1When working for NCO1
Clock, M1 are the bit wide of NCO1.
Digital vco NCO1 generates local quadrature carrier signals according to the frequency control word of the NCO1 received, makees
It send for the local oscillation signal of S quadrature frequency conversion module to S quadrature frequency conversion module；
S coincidence frequency computing module, the carrier frequency offset obtained according to S carrier track according to setting forwarding ratio
221/240 is calculated the frequency offset control word that S transmitting local oscillator is obtained (see formula 2), while according to S uplink signal frequency
The S transmitting preset frequency control word of local oscillator (see formula 3) is calculated in rate, and the two is added to obtain S transmitting local oscillator actual frequency control
Word (see formula 4) processed, which is sent to S, emits local oscillator module, while the practical frequency that S receives local oscillator is calculated according to S uplink signal frequency
Rate control word (see formula 5) is sent to S and receives local oscillator module；
In above formula, Sd_p1For s emit local oscillator frequency offset control word, 2N1Emit local oscillator bit wide, f for SS_dFor transmitting
Local oscillator clock.
In above formula, SdEmit local oscillator predeterminated frequency control word, S for SRFFor S frequency range uplink input signal
Sdown=Sd_p1+Sd (4)
In above formula, SdownEmit local oscillator actual frequency control word for S.
In above formula, SupFor S receive local oscillator actual frequency control word, 2N2Local oscillator bit wide, f are received for SS_uLocal oscillator is received for S
Clock.
S is remotely controlled subcarrier demodulation module and demodulates to S remote control subcarrier 8KHZ signal, obtains the S remote signal of 2KHz
It exports to outside；
The S baseband signal that S ranging demodulation and forwarding module send S loop filtering module demodulates, and obtains S ranging letter
Number (main side 100KHz sound, 16 or 20KHz sidetone), and distance measuring signal is sent into the first digital to analog converter DAC1；
First digital to analog converter DAC1, sampling clock 320MHz, the S distance measuring signal and external input that will be received
S telemetered signal modulation after generate 90.244MHz S modulated intermediate frequency signal send to transmission channel part S intermediate frequency filtering amplification
Circuit；Under normal circumstances, modulated intermediate frequency signal frequency is improved as far as possible, is set to reduce the intermediate frequency filtering amplifying circuit of transmission channel
Difficulty is counted, but is limited by DAC sampling clock, 120MHz is usually no more than；
X quadrature frequency conversion module, by received number combining 74.5 ± 4.5MHz of intermediate frequency signal and digital vco
NCO2 output digital local oscillator signal carry out quadrature frequency conversion, formed X baseband signal (comprising 500KHz, 100KHz, 16 or
20KHz, 8KHz signal) it send to X loop filtering module；
X loop filtering module carries out loop filtering processing to X baseband signal, filters out after obtaining filtering after band stray signal
X baseband signal (comprising 500KHz, 100KHz, 16 or 20KHz, 8KHz signal) as X loop filtering module output difference
It send to X capturing carrier tracking module and X ranging demodulation and forwarding module；
X capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered X baseband signal, will be with
The carrier frequency offset that track obtains gives X coincidence frequency computing module, and converts carrier frequency offset to the frequency of NCO2
Rate control word (see formula 6) is sent to digital vco NCO2, while X capturing carrier tracking module is from filtered X base band
The X remote control subcarrier signal that frequency is 8KHz is demodulated in signal gives X remote control subcarrier demodulation module；
F in above formulanco2For NCO2 frequency control word, fp2For the carrier shift amount of X baseband signal, fclk2When working for NCO2
Clock, M2 are the bit wide of NCO2；
Digital vco NCO2 generates local quadrature carrier signals according to the frequency control word of the NCO2 received, makees
It send for the local oscillation signal of X quadrature frequency conversion module to X quadrature frequency conversion module；
X coincidence frequency computing module, the carrier frequency offset obtained according to X carrier track according to setting forwarding ratio
749/880 is calculated the frequency offset control word that X transmitting local oscillator is obtained (see formula 7), while according to X uplink signal frequency
The X transmitting preset frequency control word of local oscillator (see formula 8) is calculated in rate, and the two is added to obtain X transmitting local oscillator actual frequency control
Word (see formula 9) processed, which is sent to X, emits local oscillator module, while the practical frequency that X receives local oscillator is calculated according to X uplink signal frequency
Rate control word (see formula 10) is sent to X and receives local oscillator module；
In above formula, Xd_p1For X emit local oscillator frequency offset control word, 2K1Emit local oscillator bit wide, f for SX_dFor transmitting
Local oscillator clock.
In formula, XdEmit local oscillator predeterminated frequency control word, X for XRFFor X frequency range uplink input signal；
Xdown=Xd_p1+Xd (9)
In formula, XdownEmit local oscillator actual frequency control word for X；
In above formula, XupFor X receive local oscillator actual frequency control word, 2K2Local oscillator bit wide, f are received for Xx_uLocal oscillator is received for X
Clock.
X is remotely controlled subcarrier demodulation module and demodulates to X remote control subcarrier 8KHZ signal, obtains the X remote signal of 2KHz
It exports to outside；
The X baseband signal that X ranging demodulation and forwarding module send X loop filtering module demodulates, and obtains ranging letter
Number (including the main side 500KHz sound, 100KHz, 16 or 20KHz sidetone), and distance measuring signal is sent into the second digitaltoanalogconversion
Device DAC2；
Second digital to analog converter DAC2, sampling clock 320MHz, the X distance measuring signal and external input that will be received
X telemetered signal modulation after generate 100.534MHz X modulated intermediate frequency signal send to transmission channel part X intermediate frequency filtering amplification
Circuit；
The S modulated intermediate frequency signal for receiving DAC1 output is filtered by S intermediate frequency filtering amplifying circuit, filters out frequency modulation in S
The humorous clutter of signal processed obtains the pure S modulated intermediate frequency signal of frequency spectrum and gives S up-converter circuit using amplification；
S up-converter circuit will receive the S modulated intermediate frequency signal that the pure frequency of frequency spectrum is 90.244MHz, emit this with S
The signal that the frequency of vibration output is 2136MHz carries out uppermixing, generates the signal that S downstream frequency is 2226.244MHz and exports；
S transmitting local oscillator receives the S transmitting local frequency control signal that S coincidence frequency computing module is sent, which emits local oscillator
Frequency control signal can require (forwarding of USB system uplink and downlink frequency coherence is than being 221/240) according to coherent forwarding, send out S
The signal frequency for penetrating local oscillation circuit output is configured according to the frequency control word that formula 4 provides, and exports S up-converter circuit
S downstream signal frequencies meet the requirement of S frequency range coherent forwarding ratio, and (i.e. S uplink signal frequency values ratio S downstream signal frequencies value is
221/240)；
The X modulated intermediate frequency signal for receiving DAC2 output is filtered by X intermediate frequency filtering amplifying circuit, filters out frequency modulation in X
The humorous clutter of signal processed obtains the pure X modulated intermediate frequency signal of frequency spectrum and gives X up-converter circuit using amplification；
X up-converter circuit will receive the X modulated intermediate frequency signal that the pure frequency of frequency spectrum is 100.534MHz, emit with X
The frequency of local oscillator output is that 8300MHz signal carries out uppermixing, generates X downstream frequency as the output of 8400.534MHz signal；
X transmitting local oscillator receives the X transmitting local frequency control signal that X coincidence frequency computing module is sent, which emits local oscillator
Frequency control signal can require (forwarding of UXB system uplink and downlink frequency coherence is than being 749/880) according to coherent forwarding, send out X
The signal frequency for penetrating local oscillation circuit output is configured according to formula 9, and the X downstream signal frequencies for exporting X up-converter circuit are full
The requirement of sufficient X frequency range coherent forwarding ratio (i.e. X uplink signal frequency values ratio X downstream signal frequencies value is 749/880)；
When the reconstruct of S and X frequency range uplink downlink, i.e., line frequency ratio will meet (240/221) S frequency range up and down, in X frequency range
When downstream frequency ratio will meet (880/749), by controlling and receiving the local oscillator output frequency in channel and transmission channel, guarantee to receive
IF signal frequency and emission medium-frequency signal frequency are constant, complete uplink downlink weight with the same transceiver channel to realize with this
Structure.
Such as S frequency range uplink signal frequency is 2226.244MHz, controls and receives channel local frequency and is changed to by 1980MHz
2156MHz generates 70.244MHz intermediate-freuqncy signal after S down conversion module and gives A/D progress digital processing.Digital processing D/A1
Output 90MHz intermediate-freuqncy signal gives transmission channel, controls transmission channel local frequency by 2136MHz and is changed to 1960MHz, through being mixed
The S frequency range downstream signal frequencies exported afterwards are 2050MHz, and line frequency is than the requirement for 240/221 above and below satisfaction；
X frequency range uplink signal frequency is 8400.534MHz, controls and receives channel local frequency and is changed to by 7074MHz
8324MHz generates 76.534MHz intermediate-freuqncy signal after X down conversion module and gives A/D progress digital processing.Digital processing D/A2
Output 100MHz intermediate-freuqncy signal gives transmission channel, controls transmission channel local frequency by 8300MHz and is changed to 7050MHz, through mixed
The X frequency range downstream signal frequencies exported after frequency are 7150MHz, and line frequency is than the requirement for 880/749 above and below satisfaction；
The TT&C Transponder is the S frequency range and X frequency range high sensitivity answering machine for the development of moon repeater satellite.It is general
Satellite TT answering machine only needs to fix a frequency range and ground carries out telemetry communication, and moon repeater satellite is the earth and the moon
The communication terminal of lander, lunar rover, it is logical using the observing and controlling of S frequency range that its TT&C Transponder should establish return link and the earth
Letter establishes forward link and lander, lunar rover using X frequency range telemetry communication again；Under special circumstances, S frequency range and X are needed
Frequency range works at the same time.Saving weight, volume, function as far as possible is also contemplated that for the TT&C Transponder of this application circumstances development
Consumption.
The TT&C Transponder passes through system integration test, meets requirement of the moon repeater satellite to answering machine performance indicator, passes through
House keeping computer sends instruction, settable S frequency range and X frequency range uplink and downlink frequency point, realizes uplink downlink reconstruct.The observing and controlling response
Machine weight 4kg, S frequency range power consumption 20W, X frequency range power consumption 22W, compared with existing S and X deep space answering machine, the light-weight 2.2Kg of answering machine
Left and right, improves nearly 35%, S frequency range power consumption and lacks 4W or so, improve nearly 16%, X frequency range power consumption and lack 3W or so, improves close
12%, realize moon repeater satellite it is confidential to response ask can and meanwhile work under S and X frequency range, weight, volume and power consumption
Minimum can establish the forward direction and return link of S and X frequency range with simplest design scheme, realize observing and controlling over the ground, to the moon
Mission requirements.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (6)
1. a kind of TT&C Transponder that spaceborne S and X band link is restructural, it is characterised in that：Including receiving channel part, number
Baseband processing portion and transmission channel part；
Receiving channel part, including：S lower frequency changer circuit, S receive local oscillation circuit, X lower frequency changer circuit, X receive local oscillation circuit and in
Frequency AGC amplifying circuit；
Received S frequency range uplink signal is carried out low noise amplification by S lower frequency changer circuit, and the letter of local oscillation circuit output is received with S
Number lower mixing is carried out, using bandpass filtering, exports the first intermediate-freuqncy signal, the output as S lower frequency changer circuit is sent to intermediate frequency AGC
Amplifying circuit；
S receives local oscillation circuit and receives the S reception local frequency control signal that S coincidence frequency computing module is sent, which receives local oscillator
Frequency control signal can as needed be changed the S signal frequency for receiving local oscillation circuit output, keep S lower frequency changer circuit defeated
The first IF signal frequency out is fixed；
Received X frequency range uplink signal, including X are remotely controlled subcarrier signal, X distance measuring signal by X lower frequency changer circuit, carry out low noise
Amplification, and be mixed under being carried out with the X signal for receiving local oscillation circuit output, using bandpass filtering, the second intermediate-freuqncy signal is exported, is made
It send for the output of X lower frequency changer circuit to intermediate frequency AGC amplifying circuit；
X receives local oscillation circuit and receives the X reception local frequency control signal that X coincidence frequency computing module is sent, which receives local oscillator
Frequency control signal can as needed be changed the X signal frequency for receiving local oscillation circuit output, keep X lower frequency changer circuit defeated
The second IF signal frequency out is fixed；Intermediate frequency AGC amplifying circuit, under the first intermediate-freuqncy signal and X that S lower frequency changer circuit is exported
By automatic growth control AGC, the power of the intermediate-freuqncy signal after making combining after the second intermediate-freuqncy signal combining of frequency changer circuit output
Control is within the scope of -10dBm~10dBm, using the bandpass filtering of 9M band above, output simulation combining intermediate-freuqncy signal send to
The ADC of digital base band processor part；
Digital base band processor part, including analog digital converter ADC, the first digital to analog converter DAC1, the second digital mould
Quasi- converter DAC2, FPGA；
FPGA includes：S IF signal processing part, X IF signal processing part；
S IF signal processing part, including：S quadrature frequency conversion module, S loop filtering module, S capturing carrier tracking module, S
It is remotely controlled subcarrier demodulation module, S ranging demodulation and forwarding module, digital vco NCO1, S coincidence frequency computing module；
X IF signal processing part, including：X quadrature frequency conversion module, X loop filtering module, X capturing carrier tracking module, X
It is remotely controlled subcarrier demodulation module, X ranging demodulation and forwarding module, digital vco NCO2, X coincidence frequency computing module；
Analog digital converter ADC, the simulation for receiving the output of intermediate frequency AGC amplifying circuit are combined intermediate-freuqncy signal, are turned by AD sampling
Number combining intermediate-freuqncy signal is changed to be sent respectively to the S quadrature frequency conversion module of FPGA and X quadrature frequency conversion module；
S quadrature frequency conversion module, the number that received digital combining intermediate-freuqncy signal and digital vco NCO1 are exported is originally
The signal that shakes carries out quadrature frequency conversion, forms S baseband signal and send to S loop filtering module；
S loop filtering module carries out loop filtering processing to S baseband signal, obtains filtered S after filtering out band stray signal
Baseband signal is sent respectively as the output of S loop filtering module to S capturing carrier tracking module and S ranging demodulation and forwarding mould
Block；
S capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered S baseband signal, will be tracked
To carrier frequency offset give S coincidence frequency computing module, and convert carrier frequency offset to the frequency control of NCO1
Word processed is sent to digital vco NCO1, while S capturing carrier tracking module demodulates S from filtered S baseband signal
Remote control subcarrier signal gives S remote control subcarrier demodulation module；
Digital vco NCO1 generates local quadrature carrier signals according to the frequency control word of the NCO1 received, as S
The local oscillation signal of quadrature frequency conversion module is sent to S quadrature frequency conversion module；
S coincidence frequency computing module, the carrier frequency offset obtained according to S carrier track is according to the forwarding of setting than 221/
240 are calculated, and obtain the frequency offset control word of S transmitting local oscillator, while S hair is calculated according to S uplink signal frequency
The preset frequency control word of local oscillator is penetrated, S emits the frequency offset control word of local oscillator and S emits the preset frequency control word of local oscillator
Addition obtains S transmitting local oscillator actual frequency control word and send to S transmitting local oscillator module, while being calculated according to S uplink signal frequency
The actual frequency control word for receiving local oscillator to S, which is sent to S, receives local oscillator module；
S is remotely controlled subcarrier demodulation module and demodulates to S remote control subcarrier signal, obtains S frequency range remote signal and exports to outside；
S ranging demodulation and forwarding module demodulate the filtered S baseband signal that S loop filtering module is sent, and obtain S survey
The first digital to analog converter DAC1 is sent into away from signal, and by distance measuring signal；
First digital to analog converter DAC1 will be generated after the S distance measuring signal received and the modulation of externally input S telemetered signal
S modulated intermediate frequency signal send to the S intermediate frequency filtering amplifying circuit of transmission channel part；
X quadrature frequency conversion module, the number that received digital combining intermediate-freuqncy signal and digital vco NCO2 are exported is originally
The signal that shakes carries out quadrature frequency conversion, forms X baseband signal and send to X loop filtering module；
X loop filtering module carries out loop filtering processing to X baseband signal, obtains filtered X after filtering out band stray signal
Baseband signal is sent respectively as the output of X loop filtering module to X capturing carrier tracking module and X ranging demodulation and forwarding mould
Block；
X capturing carrier tracking module is captured and is tracked to the carrier frequency shift of filtered X baseband signal, will be tracked
To carrier frequency offset give X coincidence frequency computing module, and convert carrier frequency offset to the frequency control of NCO2
Word processed is sent to digital vco NCO2, while X capturing carrier tracking module demodulates X from filtered X baseband signal
Remote control subcarrier signal gives X remote control subcarrier demodulation module；
Digital vco NCO2 generates local quadrature carrier signals according to the frequency control word of the NCO2 received, as X
The local oscillation signal of quadrature frequency conversion module is sent to X quadrature frequency conversion module；
X coincidence frequency computing module, the carrier frequency offset obtained according to X carrier track is according to the forwarding of setting than 749/
880 are calculated, and obtain the frequency offset control word of X transmitting local oscillator, while X hair is calculated according to X uplink signal frequency
Penetrate the preset frequency control word of local oscillator, the two, which is added to obtain X transmitting local oscillator actual frequency control word to send to X, emits local oscillator module,
It is sent simultaneously according to the actual frequency control word that X reception local oscillator is calculated in X uplink signal frequency to X and receives local oscillator module；
X is remotely controlled subcarrier demodulation module and demodulates to X remote control subcarrier signal, obtains X remote signal and exports to outside；
The X baseband signal that X ranging demodulation and forwarding module send X loop filtering module demodulates, and obtains distance measuring signal, and
X distance measuring signal is sent into the second digital to analog converter DAC2；
Second digital to analog converter DAC2 will generate X after the X distance measuring signal received and the modulation of externally input X telemetered signal
Modulated intermediate frequency signal is sent to the X intermediate frequency filtering amplifying circuit of transmission channel part；
Transmission channel part, including S intermediate frequency filtering amplifying circuit, S up-converter circuit, S transmitting local oscillation circuit, X intermediate frequency filtering are put
Big circuit, X up-converter circuit, X emit local oscillation circuit；
The S modulated intermediate frequency signal for receiving DAC1 output is filtered by S intermediate frequency filtering amplifying circuit, filters out S IF Modulation letter
Number humorous clutter, obtains the pure S modulated intermediate frequency signal of frequency spectrum and gives S up-converter circuit using amplification；
S up-converter circuit will receive the pure S modulated intermediate frequency signal of frequency spectrum, carry out with the signal of S transmitting local oscillator output upper mixed
Frequently, the output of S downlink signal is generated；
S transmitting local oscillator receives the S transmitting local frequency control signal that S coincidence frequency computing module is sent, which emits local frequency
Control signal can require the signal frequency to S transmitting local oscillation circuit output to be configured according to coherent forwarding, keep S up-conversion electric
The S downstream signal frequencies of road output meet the requirement of S frequency range coherent forwarding ratio；
The X modulated intermediate frequency signal for receiving DAC2 output is filtered by X intermediate frequency filtering amplifying circuit, filters out X IF Modulation letter
Number humorous clutter, obtains the pure X modulated intermediate frequency signal of frequency spectrum and gives X up-converter circuit using amplification；
X up-converter circuit will receive the pure X modulated intermediate frequency signal of frequency spectrum, carry out with the signal of X transmitting local oscillator output upper mixed
Frequently, the output of X downlink signal is generated；
X transmitting local oscillator receives the X transmitting local frequency control signal that X coincidence frequency computing module is sent, which emits local frequency
Control signal can require the signal frequency to X transmitting local oscillation circuit output to be configured according to coherent forwarding, keep X up-conversion electric
The X downstream signal frequencies of road output meet the requirement of X frequency range coherent forwarding ratio.
2. a kind of restructural TT&C Transponder of spaceborne S and X band link according to claim 1, it is characterised in that：Institute
The first IF signal frequency and the second IF signal frequency stated are within the scope of 70-140MHz.
3. a kind of restructural TT&C Transponder of spaceborne S and X band link according to claim 1, it is characterised in that：Institute
The bandpass filtering bandwidth in intermediate frequency AGC amplifying circuit stated, can will be in the first intermediate frequency and second within the scope of 9MHz-20MHz
Frequency signal is amplified and is filtered simultaneously.
4. a kind of restructural TT&C Transponder of spaceborne S and X band link according to claim 1, it is characterised in that：Institute
The ADC that the analog digital converter ADC stated is 12bit or more, sampling clock are 55~65MHz.
5. a kind of restructural TT&C Transponder of spaceborne S and X band link according to claim 1, it is characterised in that：Institute
Digital to analog converter DAC1 and the DAC2 output frequency stated within the scope of 80-120MHz, sampling clock is 300~
400MHz。
6. a kind of restructural TT&C Transponder of spaceborne S and X band link according to claim 1, it is characterised in that：Institute
The S that states receives local oscillator, the frequency range of S transmitting local oscillator between 1950MHz~2230MHz, frequency control precision 1MHz with
On；X receive local oscillator, X transmitting local oscillator frequency range between 7070MHz~8330MHz, frequency control precision 1MHz with
On.
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