CN102843178B - Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system - Google Patents
Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system Download PDFInfo
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Abstract
A spread spectrum relay measurement and control system compatible with a standard unified S-band measurement and control system comprises a radio-frequency (RF) receiving module, an RF transmitting module, a baseband module, a phase shift keying (PSK) module, an interface control module and a power supply module. The RF receiving module is used to achieve receiving and down-conversion of remote control signals, the RF transmitting module is used to achieve binary phase shift keying (BPSK) modulation and transmission of telemetry spread spectrum signals, the baseband module is used to achieve demodulation and despreading of the remote control signals and spreading of telemetry signals, the PSK module is used to achieve BPSK modulation of remote control code flow and demodulation of differential phase shift keying (DPSK) telemetry signals, the interface control module is used to carry out select output of remote control BPSK signals of the system or remote control BPSK signals of an answering machine system, and the power supply module is used to provide power for the RF receiving module, the RF transmitting module, the baseband module, the phase shift keying (PSK) module and the interface control module. By means of the spread spectrum relay measurement and control system compatible with the standard unified S-band measurement and control system, compatibility of the satellite standard unified S-band measurement and control system and the spread spectrum measurement and control system is achieved, and a spread spectrum relay measurement and control function can be achieved on a satellite with the standard unified S-band measurement and control system.
Description
Technical field
The present invention relates to a kind of spread spectrum relay TT&C system of compatibility standard Unified S Band TT & C architecture, the satellite being applicable to employing standard Unified S Band TT & C architecture realizes the function of spread spectrum relay observing and controlling.
Background technology
Relaying observing and controlling is a kind of relay repeater utilized on geostationary satellite, realizes the communication system of remote control between ground based terminal and user satellite, telemetry function.Utilize technique can improve TT&C coverage to medium and low earth orbit satellites, increase the satellite observing and controlling time in-orbit.Current relaying observing and controlling supplements mainly as star ground observing and controlling, is exported, realize relaying observing and controlling function by the remote signal controlling relaying detection and control terminal.
Spread-spectrum TTC System is the Satellite TT system developed rapidly in recent years.This technology adopts Pseudo Code Spread Spectrum process, has the plurality of advantages such as anti-interference, Anti TBIgG.U.S.'s third generation TDRS system and domestic sky chain relay satellite system all adopt spread spectrum system, and ground based terminal, relaying detection and control terminal are also spread spectrum design.
The system of standard Unified S Band TT & C architecture uses PM modulator approach to carry out the transmission of information, and satellite adopts USB answering machine transmitting-receiving remote-control romote-sensing signal.This TT & C architecture have maturity high, meet the features such as international standard, be the satellite communication system of current main flow, there is very strong vitality.
At present, relaying observing and controlling only uses in the satellite adopting Spread-spectrum TTC System.This is because the satellite of this system adopts Pseudo Code Spread Spectrum answering machine, signaling interface between its remote control, remote measurement processing mode and platform device is consistent with existing relaying detection and control terminal: the remote signal of band spectrum modulation completes demodulation and synchronously generates PCM code afterwards in Pseudo Code Spread Spectrum answering machine (or relaying detection and control terminal), sends into remote control unit on star and carries out follow-up remote information process; Telemetered signal inputs to Pseudo Code Spread Spectrum answering machine (or relaying detection and control terminal) with PCM code form from remote control unit star, exports after band spectrum modulation; At Pseudo Code Spread Spectrum answering machine lock-out state, forbid that the remote information of relaying detection and control terminal exports by answering machine bit synchronization high level; In answering machine out-of-lock condition, the remote information of relaying detection and control terminal is allowed to export by answering machine bit synchronization low level.
USB answering machine has remarkable difference in signaling interface between remote control, remote measurement processing mode and platform device: PSK remote control subcarrier signal, remote control carrier synchronization signal are sent into remote control unit and carried out follow-up remote information process by USB answering machine; On star, DPSK remote measurement subcarrier signal is sent into after USB answering machine carries out PM modulation and is launched by central computer.Therefore, the satellite platform equipment of employing standard Unified S Band TT & C architecture cannot compatible existing relaying TT&C system.
Summary of the invention
The technical problem that the present invention solves: overcome the deficiencies in the prior art, provide a kind of spread spectrum relay TT&C system of compatibility standard Unified S Band TT & C architecture, change on minimum basis to the user satellite platform device of the standard of employing Unified S Band TT & C architecture, the signaling interface realizing standard Unified S Band TT & C architecture and Spread-spectrum TTC System is compatible, and the satellite of standard Unified S Band TT & C architecture realizes spread spectrum relay observing and controlling function.
Technical solution of the present invention is:
A spread spectrum relay TT&C system for compatibility standard Unified S Band TT & C architecture, comprises Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module, and power module is other module for power supply;
Receiver Module realizes reception and the down-conversion of remote signal, signal after down-conversion is sent into baseband module, after the signal of baseband module to input carries out demodulation, send in PSK module again, PSK module sends into interface control module after carrying out BPSK modulation to input signal, and interface control module carries out selection to the remote control bpsk signal that the signal after BPSK modulation and outside transponder system export and exports to remote control unit on star;
On star, central computer exports remote measurement dpsk signal to PSK module, PSK module realizes the demodulation to remote measurement dpsk signal, afterwards the telemetered signal of generation is inputed to baseband module, baseband module realize to input telemetered signal add expansion after, inputing to radiofrequency emitting module, radiofrequency emitting module realizes modulating the BPSK of remote measurement spread-spectrum signal and launching;
Described Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit; Reception antenna receives the remote signal that repeater satellite is launched, and carry out after the amplification of signal, filtering process through signal amplification circuit, down-conversion sends into baseband module after exporting intermediate-freuqncy signal; Meanwhile, Receiver Module provides reference clock signal for radiofrequency emitting module and baseband module.
Described radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna; BPSK modulation circuit carries out radio band BPSK modulation to the remote measurement spread-spectrum signal that baseband module is sent into, and after signal amplification circuit amplification, filtering, then sends through transmitting antenna.
Described baseband module comprises remote control baseband signal processing unit and remote measurement baseband signal processing unit; The intermediate-freuqncy signal that the reference clock radio frequency receiver module that remote control baseband signal processing unit utilizes Receiver Module to provide exports carries out the acquisition and tracking of carrier wave and pseudo-code, complete demodulation and the decoding of remote-control data, and decoding is exported, according to clock, gate and data three the timing waveform of line signal send into the BPSK modulation that PSK module carries out remote information; The remote measurement PCM code that PSK module exports by remote measurement baseband signal processing unit carries out convolutional encoding and band spectrum modulation, remote measurement spread-spectrum signal is sent into radiofrequency emitting module and processes.
Described PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit; Remote control BPSK modulating unit receives the output signal from baseband module, sends into interface control module carry out selection output to this output signal after carrying out PSK modulation;
Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal that on star, central computer exports, and after settling signal demodulation, the remote measurement baseband signal processing unit remote measurement PCM code obtained and clock signal being delivered to baseband module carries out encoding and spread processing.
Beneficial effect of the present invention:
(1) the present invention makes relaying observing and controlling function be achieved on the satellite of standard Unified S Band TT & C architecture, and inherits ripe spread spectrum system relaying detection and control terminal design to greatest extent, and the functions of modules of increase is independent, is convenient to combination and designs separately;
(2) the present invention does not do any change to the satellite platform of standard Unified S Band TT & C architecture stand-alone device of being correlated with, only need the suitably whole star cable system of amendment, the spread spectrum relay observing and controlling function under standard Unified S Band TT & C architecture can be realized, greatly reduce development cost and change risk.
Accompanying drawing explanation
Fig. 1 is present system configuration diagram;
Fig. 2 is Receiver Module of the present invention and radio frequency output module signal transacting flow graph;
Fig. 3 is that remote signal of the present invention catches flow chart;
Fig. 4 is the tracking process flow graph of remote signal of the present invention;
Fig. 5 is synchronous indicating signal flow graph of the present invention;
Fig. 6 is telemetered signal flow graph of the present invention.
Fig. 7 is dpsk signal demodulation flow graph of the present invention;
Fig. 8 is interface control module schematic diagram of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described in detail.
The invention provides a kind of spread spectrum relay TT&C system of compatibility standard Unified S Band TT & C architecture, at the satellite that have employed standard Unified S Band TT & C architecture, realize the function of spread spectrum relay observing and controlling.Be illustrated in figure 1 system of the present invention composition, form primarily of with lower module: Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module; Receiver Module realizes reception and the down-conversion of remote signal; Radiofrequency emitting module realizes BPSK modulation and the transmitting of remote measurement spread-spectrum signal; What baseband module realized the demodulation of remote signal and telemetered signal adds expansion; PSK module realizes the BPSK modulation of remote control code stream and the demodulation of remote measurement dpsk signal; Interface control module carries out selection to native system remote control bpsk signal or transponder system remote control bpsk signal and exports; Power module is above-mentioned each module for power supply.
The course of work is: Receiver Module realizes reception and the down-conversion of remote signal, signal after down-conversion is sent into baseband module, after the signal of baseband module to input carries out demodulation, send in PSK module again, PSK module sends into interface control module after carrying out BPSK modulation to input signal, and interface control module carries out selection to the remote control bpsk signal that the signal after BPSK modulation and outside transponder system export and exports to remote control unit on star;
On star, central computer exports remote measurement dpsk signal to PSK module, PSK module realizes the demodulation to remote measurement dpsk signal, afterwards the telemetered signal of generation is inputed to baseband module, baseband module realize to input telemetered signal add expansion after, inputing to radiofrequency emitting module, radiofrequency emitting module realizes modulating the BPSK of remote measurement spread-spectrum signal and launching;
In the present invention, Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit.The signal transacting flow graph of Receiver Module and radiofrequency emitting module as shown in Figure 2.Reception antenna receives the remote control spread-spectrum signal that repeater satellite forwards, and inputs to by radio frequency cable the low noise amplification that rear end LNA carries out small-signal.Receiver module constant-temperature crystal oscillator is by local local oscillation circuit radio frequency signal generation, the S-band remote signal mixing exported with LNA, obtain the intermediate-freuqncy signal of 66.5MHz, the down-converted of settling signal, send into the despread-and-demodulation that baseband module carries out intermediate frequency remote signal.
Radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna.Remote measurement signal bit stream after spread processing inputs to BPSK modulation circuit by baseband module, radiofrequency emitting module carries out BPSK modulation treatment to remote measurement spread-spectrum signal after receiver module constant-temperature crystal oscillator signal is S-band carrier signal by local local oscillation circuit frequency multiplication.Subsequently through amplification, filtering process, through transmitting antenna, spread spectrum telemetered signal is emitted to repeater satellite and forwards, thus adapt to the relay satellite system of spread spectrum system.
Baseband module comprises remote control baseband signal processing unit, remote measurement baseband signal processing unit two parts.Hardware designs mainly comprises signal transacting FPGA (Xilinx, XQR2V3000), base band configuration management FPGA (Actel, A54SX72A), configuring chip ROM/FLASH, ADC and DAC etc.
The 66.5MHz intermediate-freuqncy signal that remote control baseband signal processing unit received RF receiver module exports, after AD sampling, in signal transacting FPGA, carry out fast Acquisition and the tracking of carrier wave and pseudo-code, completion bit be synchronous, demodulation, the digital signal processing such as Viterbi decoding.
Be illustrated in figure 3 remote signal and catch flow chart.Carrier wave and acquiring pseudo code are two-dimentional search procedures.In order to catch upward signal, need the pseudo-code and the carrier wave that reappear remote signal simultaneously.Adopt FFT to catch soon and realize frequency axial scan, frequency axis scanning increment chooses 1/720 of Doppler frequency shift maximum; The mode of 1/2 chip serial movement is taked to carry out pseudo-code phase search.In search procedure, I and the Q two paths of signals after peeling off Digital Down Convert and PN code carries out anomalous integral and adds up, and calculates the mould side value I of signal
2+ Q
2, and the thresholding of each mould side value with setting to be compared, to determine whether to meet harvesting policy, finally estimates the carrier wave of expectation and code phase values and complete and catch.
Be illustrated in figure 4 the tracking process flow graph of remote signal.After judging that trapped state completes, the basis of the pseudo-code phase predicted value of catching and pseudo-Doppler frequency predicted value is carried out the tracking of pseudo-code phase tracking, carrier track and data bit.Carry out Viterbi decoding after baseband module data bit tracking lock, and decoding is exported the PSK modulation carrying out remote information according to the timing waveform feeding PSK module of 8KHz remote control clock, bit synchronization signal and remote control PCM code three line signal.
Be illustrated in figure 5 the process flow graph of telemetered signal.Remote measurement baseband signal processing unit receives the remote measurement PCM code and clock signal that PSK module exports, and completes band spectrum modulation and the pulse shaping of telemetry in signal transacting FPGA, to be taken remote measurement BPSK modulation by input radio frequency transmitter module after DA conversion.
Base band configuration FPGA is managed for configuration base band signal process FPGA, completes the global configuration of base band signal process FPGA.Base band configuration FPGA and base band signal process FPGA clock are provided by Receiver Module output clock source, this clock is converted to LVPECL level and exports by base band signal process FPGA, as the change over clock of AD, and the 4 times of pseudo-code rate clock produced by inner NCO are supplied to DA as change over clock.
PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit two parts.Remote control BPSK modulating unit receives from the remote control PCM code of baseband module, 8KHz clock signal and bit synchronization signal, and remote control pcm stream is carried out BPSK modulation.8KHz clock signal is by second-order bandpass filter and analog inverter, sine wave signal and back (π phase place) sine wave signal thereof of same frequency is formed after filtering interfering and noise, remote control PCM code is by trigger control simulation switch, form bpsk signal, send into interface control module and carry out there is the new output of selection, meanwhile, bit synchronization signal is transparently forwarded to interface control module.Figure 6 shows that bpsk signal modulation flow graph.Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal that on star, central computer exports, by a square around-France extraction 65.536KHz carrier signal, DPCM code is produced through sample circuit, carry out differential conversion and generate PCM code, send into baseband module and take remote measurement signal spread-spectrum process together with the code clock signal extracted.Figure 7 shows that dpsk signal demodulation flow graph.
As shown in Figure 8, the alternative of native system remote control bpsk signal (and bit synchronization signal) and transponder system remote control bpsk signal (and carrier synchronization signal) is exported to remote control unit by non-magnetic latching relay by interface module, thus the signal input interface of remote control unit on compatible star.The control signal of relay is controlled by transponder system carrier synchronization signal, and when this signal is high level, relay switch is tangential consistent with Fig. 8, and output transponder system remote control bpsk signal and carrier synchronization signal send into remote control unit on star; When this signal single is low level, relay switch is tangential and Fig. 8 is reverse, selects to export native system bpsk signal and bit synchronization signal.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (5)
1. a spread spectrum relay TT&C system for compatibility standard Unified S Band TT & C architecture, it is characterized in that comprising Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module, power module is other module for power supply;
Receiver Module realizes reception and the down-conversion of remote signal, signal after down-conversion is sent into baseband module, after the signal of baseband module to input carries out demodulation, send in PSK module again, PSK module sends into interface control module after carrying out BPSK modulation to input signal, interface control module is carried out alternative by non-magnetic latching relay export to remote control unit on star to the remote control bpsk signal that the signal after BPSK modulation and external USB transponder system export, thus the signal input interface of remote control unit on compatible star; The control signal of relay is controlled by USB transponder system carrier synchronization signal, and when this signal is high level, output USB transponder system remote control bpsk signal and carrier synchronization signal send into remote control unit on star; When this signal is low level, export the signal after PSK module BPSK modulation and bit synchronization signal;
On star, central computer exports remote measurement dpsk signal to PSK module, the remote measurement DPSK demodulating unit of PSK module receives the remote measurement dpsk signal that on star, central computer exports, by a square around-France extraction 65.536KHz carrier signal, DPCM code is produced through sample circuit, carry out differential conversion and generate PCM code, send into baseband module to take remote measurement signal spread-spectrum process together with the code clock signal extracted, input to radiofrequency emitting module again, radiofrequency emitting module realizes modulating the BPSK of remote measurement spread-spectrum signal and launching.
2. the spread spectrum relay TT&C system of a kind of compatibility standard Unified S Band TT & C architecture according to claim 1, is characterized in that:
Described Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit; Reception antenna receives the remote signal that repeater satellite is launched, and carry out after the amplification of signal, filtering process through signal amplification circuit, down-conversion sends into baseband module after exporting intermediate-freuqncy signal; Meanwhile, Receiver Module provides reference clock signal for radiofrequency emitting module and baseband module.
3. the spread spectrum relay TT&C system of a kind of compatibility standard Unified S Band TT & C architecture according to claim 1, is characterized in that:
Described radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna; BPSK modulation circuit carries out radio band BPSK modulation to the remote measurement spread-spectrum signal that baseband module is sent into, and after signal amplification circuit amplification, filtering, then sends through transmitting antenna.
4. the spread spectrum relay TT&C system of a kind of compatibility standard Unified S Band TT & C architecture according to claim 1, is characterized in that:
Described baseband module comprises remote control baseband signal processing unit and remote measurement baseband signal processing unit; The intermediate-freuqncy signal that the reference clock radio frequency receiver module that remote control baseband signal processing unit utilizes Receiver Module to provide exports carries out the acquisition and tracking of carrier wave and pseudo-code, complete demodulation and the decoding of remote-control data, and decoding is exported, according to clock, gate and data three the timing waveform of line signal send into the BPSK modulation that PSK module carries out remote information; The remote measurement PCM code that PSK module exports by remote measurement baseband signal processing unit carries out convolutional encoding and band spectrum modulation, remote measurement spread-spectrum signal is sent into radiofrequency emitting module and processes.
5. the spread spectrum relay TT&C system of a kind of compatibility standard Unified S Band TT & C architecture according to claim 1, is characterized in that:
Described PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit; Remote control BPSK modulating unit receives the output signal from baseband module, sends into interface control module carry out selection output to this output signal after carrying out PSK modulation;
Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal that on star, central computer exports, and after settling signal demodulation, the remote measurement baseband signal processing unit remote measurement PCM code obtained and clock signal being delivered to baseband module carries out encoding and spread processing.
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| CN111478726B (en) * | 2020-05-27 | 2022-06-03 | 中国科学院微小卫星创新研究院 | Communication system for small communication satellite |
| CN112187339A (en) * | 2020-09-27 | 2021-01-05 | 山东航天电子技术研究所 | Measure communication integration sky base measurement and control terminal |
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