CN110824507B - Simulator of upper note receiving processor of navigation satellite - Google Patents
Simulator of upper note receiving processor of navigation satellite Download PDFInfo
- Publication number
- CN110824507B CN110824507B CN201911178989.4A CN201911178989A CN110824507B CN 110824507 B CN110824507 B CN 110824507B CN 201911178989 A CN201911178989 A CN 201911178989A CN 110824507 B CN110824507 B CN 110824507B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency signal
- digital
- processing unit
- radio frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
-
- 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
-
- 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
- G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
Abstract
The invention provides a simulator of a navigation satellite upper note receiving processor, which comprises an analog signal processing unit and a digital signal processing unit, wherein: the analog signal processing unit is used for converting the upper-injection radio frequency signal into an analog intermediate frequency signal through finishing radio frequency signal down-conversion, digital-to-analog conversion and data transmission, converting the analog intermediate frequency signal into a digital intermediate frequency signal, and packaging and transmitting the digital intermediate frequency signal to the digital signal processing unit; and the digital signal processing unit is based on GPU operation and is used for receiving the digital intermediate frequency signal and processing the digital intermediate frequency signal so as to simulate the receiving of an uplink injection signal when a satellite runs.
Description
Technical Field
The invention relates to the technical field of navigation satellite ground simulation, in particular to a GPU-based navigation satellite upper-note receiving processor simulator.
Background
The satellite simulator is used for carrying out the test verification task of the whole navigation system on behalf of the state of the space section.
The upper injection receiving processor simulator is one of important components of a satellite simulator, and has the main functions of receiving an uplink injection/satellite-ground time synchronization signal sent by a ground operation control (operation control verification subsystem), completing precise time comparison measurement, and transmitting a measurement result back to the ground for satellite-ground bidirectional time synchronization; and demodulating the navigation information and the parameters from the uplink injection signals, and sending the information and the parameters to the navigation task processor.
In order to ensure the reliability of the test result, the key technical indexes of the satellite simulator and the real satellite are required to be consistent, and meanwhile, the satellite simulator is required to have the characteristics of flexibility and configurability in order to conveniently develop test verification tasks of various new technologies and new systems. The traditional satellite upper note receiving processor adopts a structure combining DSP and FPGA, and the structure has the defects of long development period, high cost, complex debugging, difficult upgrading and reconstruction and the like, so that the traditional satellite upper note receiving processor is not suitable for being used as a ground test task. If a software receiver scheme based on a CPU is adopted, the processing time delay is large, and the information flow processing time delay of the satellite cannot be truly simulated.
Disclosure of Invention
The invention aims to provide a simulator of an upper note receiving processor of a navigation satellite, which is used for solving the problem of poor flexibility of the existing simulator of the upper note receiving processor of the navigation satellite.
In order to solve the above technical problem, the present invention provides a simulator of a navigation satellite uploading receiving processor, wherein the simulator of the navigation satellite uploading receiving processor comprises an analog signal processing unit and a digital signal processing unit, wherein:
the analog signal processing unit is used for converting the upper-injection radio frequency signal into an analog intermediate frequency signal through finishing radio frequency signal down-conversion, analog-to-digital conversion and data transmission, converting the analog intermediate frequency signal into a digital intermediate frequency signal, and packaging and transmitting the digital intermediate frequency signal to the digital signal processing unit; the digital signal processing unit is used for receiving the digital intermediate frequency signal and processing the digital intermediate frequency signal so as to simulate the reception of an uplink injection signal when a satellite runs;
the digital signal processing unit performs high-speed operation based on a GPU (graphics processing Unit) to complete uplink injection signal receiving of a digital baseband signal layer, wherein the uplink injection signal receiving comprises digital down-conversion, signal capturing, correlation of spread spectrum codes, receiving of numerical control oscillation carriers, receiving of numerical control oscillation pseudo codes, signal loop tracking, text demodulation and interface communication, so that the digital baseband signal processing function is realized in a software mode.
Optionally, in the simulator of the upper injection receiving processor of the navigation satellite, the analog signal processing unit and the digital signal processing unit are connected by a high-speed optical fiber.
Optionally, in the simulator of the upper-injection receiving processor of the navigation satellite, the high-speed optical fiber is a coaxial cable, and the transmission speed is 10 Gbps.
Optionally, in the simulator of the upper-injection receiving processor of the navigation satellite, the frequency of the analog intermediate frequency signal is 60MHz to 80 MHz.
Optionally, in the simulator of the upper-injection receiving processor of the navigation satellite, the analog signal processing unit includes a coupling component, an amplifying and filtering component, a frequency conversion component, and an AD sampling module, where:
the coupling component synthesizes a ground radio frequency signal and a closed loop signal generated by an upper injection analog source to form an upper injection radio frequency signal;
the amplifying and filtering component is used for filtering the upper injection radio frequency signal to remove high-frequency components, amplifying the upper injection radio frequency signal, outputting the upper injection radio frequency signal and adjusting the power of the upper injection radio frequency signal during output;
the frequency conversion component down-converts the up-injected radio frequency signal to the analog intermediate frequency signal;
and the AD sampling module carries out AD sampling on the analog intermediate frequency signal and converts the analog intermediate frequency signal into a digital intermediate frequency signal.
Optionally, in the simulator of the navigation satellite uplink transmission and reception processor, the frequency conversion component includes a radio frequency filter, a mixer, and a local oscillator, where the radio frequency filter filters the uplink radio frequency signal, the local oscillator generates a local oscillator signal, an antenna of the mixer receives the uplink radio frequency signal, and mixes the uplink radio frequency signal with the local oscillator signal to obtain an analog intermediate frequency signal;
the amplifying and filtering component comprises an amplifier and a filter, the filter filters the upper injection radio frequency signal to remove high-frequency components, and the amplifier amplifies the upper injection radio frequency signal.
Optionally, in the navigation satellite upper-injection receiving processor simulator, the sampling rate of the AD sampling module is 375MHz, the sampling bit number of the AD sampling module is 12 bits, and the AD sampling module has a temperature compensation function.
Optionally, in the simulator of the upper note receiving processor of the navigation satellite, the front end of the simulator of the upper note receiving processor of the navigation satellite is connected to an adjustable attenuator, and the adjustable attenuator is used for maintaining the linear output of the simulator of the upper note receiving processor of the navigation satellite;
the simulator of the navigational satellite upper injection receiving processor also comprises a zero value monitoring channel, and the zero value monitoring channel provides correction of the satellite ranging result by the ground injection station.
Optionally, in the simulator of the upper note receiving processor of the navigation satellite, the digital signal processing unit includes a data information processing module and an interface communication module, wherein:
the data information processing module comprises a digital down-conversion module, an interference suppression module, a capturing channel, a tracking channel and an information demodulation and pseudo-range measurement module;
the digital intermediate frequency signal is converted into an I path orthogonal signal and a Q path orthogonal signal after passing through the digital down-conversion module, the I path orthogonal signal and the Q path orthogonal signal are subjected to interference signal removal through the interference suppression module, carrier removal, pseudo code de-spreading and data preprocessing are carried out through the capturing channel to obtain a related accumulated value, the related accumulated value is subjected to tracking processing through the tracking channel, and locking detection, data demodulation and pseudo range measurement operations are completed through the information demodulation and pseudo range measurement module;
the interface communication module is used for providing an interface for the data information processing module to communicate with the outside.
Optionally, in the simulator of the upper-injection receiving processor of the navigation satellite, the information demodulation and pseudorange measurement module includes a correlator, a receiving carrier digitally controlled oscillator, a receiving pseudo code digitally controlled oscillator, and a text demodulation module;
the correlator is used for finishing the correlation of the spread spectrum codes;
the receiving carrier wave numerically controlled oscillator is used for generating a carrier wave signal required by signal demodulation;
the receiving pseudo code numerically controlled oscillator is used for generating synchronous pseudo code chips required by the correlator;
the message demodulation module is used for signal demodulation.
In the simulator of the upper injection receiving processor of the navigation satellite, the upper injection radio-frequency signal is converted into the analog intermediate-frequency signal through the analog signal processing unit, the analog intermediate-frequency signal is converted into the digital intermediate-frequency signal, the digital intermediate-frequency signal is transmitted to the digital signal processing unit after being packaged, the digital signal processing unit takes the digital intermediate-frequency signal as the uplink injection signal on the digital baseband level based on GPU operation and processes the digital intermediate-frequency signal, the defects of long development period, high cost, complex debugging, difficult upgrading and reconstruction and the like of a framework of combining a DSP (digital signal processor) and an FPGA (field programmable gate array) of a traditional satellite upper injection receiving processor are overcome, and the problem of larger processing delay of a traditional software receiver is solved.
Specifically, the invention realizes the software of the baseband signal processing function, is beneficial to the flexible and variable upgrading of a signal system, a signal format, a text arrangement, a modulation mode and the like, greatly enhances the designability, the expansibility and the maintainability of the system, and is beneficial to the test verification of the system and the key technology on the ground; the real-time performance of signal processing can be ensured through the high-speed computing capability of the GPU, and the consistency of signal processing and information transmission delay with a real satellite is ensured; the device is convenient for troubleshooting and debugging, the processed intermediate state information can be completely output by a software baseband signal processing mode, and the internal information interface can be completely opened and output to the outside; hardware function degradation is realized, so that the hardware state does not restrict system upgrading, and the reconfigurable capability of information processing is improved; the system has the capability of storing the sampled data in real time and playing back the sampled data to the radio frequency signal in an off-line manner, and is convenient for problem backtracking and troubleshooting.
Drawings
FIG. 1 is a schematic diagram of a navigation upper note receiving processor simulator in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of processing an uplink signal of a data information processing module according to an embodiment of the present invention;
shown in the figure: 10-an analog signal processing unit; 11-a coupling component; 12-an amplifying and filtering component; 13-a frequency conversion assembly; 14-AD sampling module; 20-a digital signal processing unit; 21-a data information processing module; 211-a digital down conversion module; 212-an interference suppression module; 213-capture channel; 214-tracking channel; 215-information demodulation and pseudorange measurement module; 22-interface communication module; 30-external components.
Detailed Description
The following describes the simulator of the upper note receiving processor for the navigation satellite according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a simulator of the upper note receiving processor of the navigation satellite, so as to solve the problem of poor flexibility of the existing simulator of the upper note receiving processor of the navigation satellite.
In order to realize the above idea, the present invention provides a simulator of a navigation satellite uplock receiving processor, wherein the simulator of the navigation satellite uplock receiving processor comprises an analog signal processing unit and a digital signal processing unit, and wherein: the analog signal processing unit is used for converting the upper-injection radio frequency signal into an analog intermediate frequency signal through finishing radio frequency signal down-conversion, analog-to-digital conversion and data transmission, converting the analog intermediate frequency signal into a digital intermediate frequency signal, and packaging and transmitting the digital intermediate frequency signal to the digital signal processing unit; the digital signal processing unit is used for receiving the digital intermediate frequency signal and processing the digital intermediate frequency signal so as to simulate the reception of an uplink injection signal when a satellite runs; the digital signal processing unit performs high-speed operation based on a GPU (graphics processing Unit) to complete uplink injection signal receiving of a digital baseband signal layer, wherein the uplink injection signal receiving comprises digital down-conversion, signal capturing, correlation of spread spectrum codes, receiving of numerical control oscillation carriers, receiving of numerical control oscillation pseudo codes, signal loop tracking, text demodulation and interface communication, so that the digital baseband signal processing function is realized in a software mode.
< example one >
The present embodiment provides a simulator of a receiving processor for a navigation satellite uplicate, as shown in fig. 1, the simulator of a receiving processor for a navigation satellite uplicate includes an analog signal processing unit 10 and a digital signal processing unit 20, wherein: the analog signal processing unit 10 is configured to down-convert the upper-injection radio frequency signal to an analog intermediate frequency signal by completing down-conversion, analog-to-digital conversion, and data transmission of the radio frequency signal, convert the analog intermediate frequency signal to a digital intermediate frequency signal, and transmit the digital intermediate frequency signal to the digital signal processing unit 20 after being packed; the digital signal processing unit 20 is configured to receive the digital intermediate frequency signal, and process the digital intermediate frequency signal to simulate reception of an uplink injection signal when a satellite operates; the digital signal processing unit 20 performs high-speed operation based on the GPU to complete uplink injection signal reception at the digital baseband signal level, where the uplink injection signal reception includes digital down-conversion, signal capture, correlation of spreading codes, reception of a digitally controlled oscillation carrier, reception of a digitally controlled oscillation pseudo code, signal loop tracking, text demodulation, and interface communication, so as to make the digital baseband signal processing function software.
The simulator of the upper note receiving processor of the navigation satellite overcomes the defects of long development period, high cost, complex debugging, difficult upgrading and reconstruction and the like of the traditional framework of combining the DSP of the upper note receiving processor of the satellite with the FPGA, and also overcomes the problem of large processing delay of the traditional software receiver. The digital signal processing unit realizes high-speed operation based on a GPU and mainly completes uplink injection signal receiving of a digital baseband signal layer, wherein the uplink injection signal receiving comprises digital down-conversion, signal capturing, a correlator, a receiving carrier NCO, a receiving pseudo code NCO, signal loop tracking, text demodulation, interface communication and the like.
A Graphics Processing Unit (GPU), also called a display core, a visual processor, and a display chip, is a microprocessor that is specially used for image and Graphics related operations on a personal computer, a workstation, a game machine, and some mobile devices (such as a tablet computer, a smart phone, etc.). The GPU reduces the dependence of the graphics card on the CPU, and performs part of the original CPU work, and particularly, the core technologies adopted by the GPU in 3D graphics processing include hardware T & L (geometric transformation and illumination processing), cubic environment texture mapping and vertex mixing, texture compression and bump mapping, a dual-texture four-pixel 256-bit rendering engine, and the like, and the hardware T & L technology can be said to be a mark of the GPU. Manufacturers of GPUs have primarily NVIDIA and ATI.
Specifically, in the simulator of the upper injection receiving processor of the navigation satellite, the analog signal processing unit is connected with the digital signal processing unit by a high-speed optical fiber. The high-speed optical fiber is a coaxial cable, and the transmission speed is 10 Gbps. The frequency of the analog intermediate frequency signal is 60 MHz-80 MHz.
As shown in fig. 1, in the simulator of the injection receiving processor on the navigation satellite, the analog signal processing unit 10 includes a coupling component 11, an amplifying and filtering component 12, a frequency conversion component 13 and an AD sampling module 14, wherein: the coupling component 11 synthesizes a ground radio frequency signal and a closed-loop signal generated by an upper injection analog source to form an upper injection radio frequency signal; the amplifying and filtering component 12 is configured to filter the upper injection radio frequency signal to remove a high frequency component, amplify the upper injection radio frequency signal, output the upper injection radio frequency signal, and adjust the power of the upper injection radio frequency signal when outputting the upper injection radio frequency signal; the frequency conversion component 13 down-converts the up-injected radio frequency signal to the analog intermediate frequency signal; the AD sampling module 14 performs AD sampling on the analog intermediate frequency signal, and converts the analog intermediate frequency signal into a digital intermediate frequency signal. The frequency conversion component 13 includes a radio frequency filter, a frequency mixer, and a local oscillator, the radio frequency filter filters the uplink radio frequency signal, the local oscillator generates a local oscillator signal, an antenna of the frequency mixer receives the uplink radio frequency signal, and mixes the uplink radio frequency signal with the local oscillator signal to obtain an analog intermediate frequency signal; the amplifying and filtering component 12 includes an amplifier and a filter, the filter filters the upper injection rf signal to remove high frequency components, and the amplifier amplifies the upper injection rf signal. The sampling rate of AD sampling module 14 is 375MHz, the sampling number of bits of AD sampling module 14 is 12 bits, AD sampling module 14 has the temperature compensation function.
A mixer is a process that transforms the frequency of a signal from one magnitude to another. Mixers are typically used to generate intermediate frequency signals: the mixer mixes the signal received by the antenna with a signal generated by a local oscillator, wherein cos α cos β is [ cos (α + β) + cos (α - β) ]/2; it can be understood that α is the signal frequency quantity and β is the local oscillator frequency quantity, resulting in a sum and difference frequency. When the frequency of the mixing is equal to the intermediate frequency, the signal can be amplified by an intermediate frequency amplifier and then peak detected.
Further, in the simulator of the navigational satellite upper note receiving processor, the front end of the simulator of the navigational satellite upper note receiving processor is connected with an adjustable attenuator, and the adjustable attenuator is used for maintaining the linear output of the simulator of the navigational satellite upper note receiving processor; the simulator of the navigational satellite upper injection receiving processor also comprises a zero value monitoring channel, and the zero value monitoring channel provides correction of the satellite ranging result by the ground injection station.
In order to meet the index requirement of the distance measurement precision of 0.5ns of the simulator of the upper note receiving processor, the analog signal processing unit is required to have high time delay stability in design. The main influencing factors causing the instability of the channel delay are the ambient temperature and the nonlinearity of the device. In the design process, the good heat dissipation and ventilation conditions are kept, meanwhile, the transmission coaxial cable with high phase stability is adopted, the number of active devices is reduced, the AD device with the temperature compensation function is adopted to reduce the drift of time delay along with the temperature, and the influence of the temperature on the time delay is reduced. The channel delay changes along with the level change mainly due to the change of the working point of the nonlinear device, when the upper note receiving processor simulator is designed, the adjustable attenuator is added at the front end of the link, and all levels of devices can be in a linear working state under the condition of large external input. In addition to the above measures, a zero-value monitoring channel needs to be added to provide correction of the on-satellite ranging result by the ground.
In a receiver, if the intermediate frequency signal obtained after mixing is lower than the original signal frequency, the mixing is called down-conversion. The purpose of down-conversion is to reduce the carrier frequency of the signal or to directly remove the carrier frequency to obtain a baseband signal. The down-conversion mode has simple circuit and low cost, so the down-conversion mode is widely applied to civil equipment and military equipment with low performance requirement.
As shown in fig. 1, in the processor simulator for satellite navigation broadcasting, the digital signal processing unit 20 includes a data information processing module 21 and an interface communication module 22, wherein: as shown in fig. 2, the data information processing module 21 includes a digital down-conversion module 211, an interference suppression module 212, an acquisition channel 213, a tracking channel 214, and an information demodulation and pseudo-range measurement module 215; the digital intermediate frequency signal is converted into an I-path orthogonal signal and a Q-path orthogonal signal after passing through the digital down-conversion module 211, the I-path orthogonal signal and the Q-path orthogonal signal are subjected to interference signal removal through the interference suppression module 212, and are subjected to carrier removal, pseudo code de-spreading and data preprocessing through the acquisition channel 213 to obtain a related accumulated value, the related accumulated value is subjected to tracking processing through the tracking channel 214, and locking detection, data demodulation and pseudo range measurement operations are performed through the information demodulation and pseudo range measurement module 215; the interface communication module 22 is used for providing an interface for the data information processing module 21 to communicate with the outside, as shown in fig. 1-2, and the external component 30 provides a 1pps signal for the data information processing module.
Further, in the navigation satellite upper-injection receiving processor simulator, the information demodulation and pseudorange measurement module 215 includes a correlator, a receiving carrier numerically-controlled oscillator, a receiving pseudo-code numerically-controlled oscillator, and a text demodulation module; the correlator is used for finishing the correlation of the spread spectrum codes; the receiving carrier wave numerically controlled oscillator is used for generating a carrier wave signal required by signal demodulation; the receiving pseudo code numerically controlled oscillator is used for generating synchronous pseudo code chips required by the correlator; the message demodulation module is used for signal demodulation.
The digital signal processing unit needs to simultaneously realize the despreading and tracking of A, B two ground injection station signals (each including I, Q paths) and 1 path of local zero-value signal, namely 5 paths of code division spread spectrum signals. In order to realize the consistency of the processing time delay of a simulator and a real satellite using a framework of combining a DSP and an FPGA, the parallel processing advantage of a GPU is required to be fully utilized in the baseband signal processing process, the parallel capturing and tracking of 5 channels are realized in parallel by adopting a stream (stream) technology in the GPU, and the decoding and pseudo-range measurement of signals are realized in a CPU.
In the simulator of the upper injection receiving processor of the navigation satellite, the upper injection radio-frequency signal is converted into the analog intermediate-frequency signal through the analog signal processing unit, the analog intermediate-frequency signal is converted into the digital intermediate-frequency signal, the digital intermediate-frequency signal is transmitted to the digital signal processing unit after being packaged, the digital signal processing unit takes the digital intermediate-frequency signal as the uplink injection signal on the digital baseband level based on GPU operation and processes the digital intermediate-frequency signal, the defects of long development period, high cost, complex debugging, difficult upgrading and reconstruction and the like of a framework of combining a DSP (digital signal processor) and an FPGA (field programmable gate array) of a traditional satellite upper injection receiving processor are overcome, and the problem of larger processing delay of a traditional software receiver is solved.
Specifically, the invention realizes the software of the baseband signal processing function, is beneficial to the flexible and variable upgrading of a signal system, a signal format, a text arrangement, a modulation mode and the like, greatly enhances the designability, the expansibility and the maintainability of the system, and is beneficial to the test verification of the system and the key technology on the ground; the real-time performance of signal processing can be ensured through the high-speed computing capability of the GPU, and the consistency of signal processing and information transmission delay with a real satellite is ensured; the device is convenient for troubleshooting and debugging, the processed intermediate state information can be completely output by a software baseband signal processing mode, and the internal information interface can be completely opened and output to the outside; hardware function degradation is realized, so that the hardware state does not restrict system upgrading, and the reconfigurable capability of information processing is improved; the system has the capability of storing the sampled data in real time and playing back the sampled data to the radio frequency signal in an off-line manner, and is convenient for problem backtracking and troubleshooting.
In summary, the above embodiments have described the different configurations of the injection receiver simulator on the navigation satellite in detail, and it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any modifications made on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A simulator of a receiving processor for a navigation satellite upper note is characterized by comprising an analog signal processing unit and a digital signal processing unit, wherein:
the analog signal processing unit is used for converting the upper-injection radio frequency signal into an analog intermediate frequency signal through finishing radio frequency signal down-conversion, analog-to-digital conversion and data transmission, converting the analog intermediate frequency signal into a digital intermediate frequency signal, and packaging and transmitting the digital intermediate frequency signal to the digital signal processing unit; the digital signal processing unit is used for receiving the digital intermediate frequency signal and processing the digital intermediate frequency signal so as to simulate the reception of an uplink injection signal when a satellite runs;
the digital signal processing unit performs high-speed operation based on a GPU (graphics processing Unit) to complete uplink injection signal receiving of a digital baseband signal layer, wherein the uplink injection signal receiving comprises digital down-conversion, signal capturing, correlation of spread spectrum codes, receiving of numerical control oscillation carriers, receiving of numerical control oscillation pseudo codes, signal loop tracking, text demodulation and interface communication, so that the digital baseband signal processing function is realized in a software mode;
the front end of the simulator of the navigational satellite uploading receiving processor is connected with an adjustable attenuator, and the adjustable attenuator is used for maintaining the linear output of the simulator of the navigational satellite uploading receiving processor;
the simulator of the navigational satellite upper injection receiving processor also comprises a zero value monitoring channel, and the zero value monitoring channel provides correction of the onboard distance measurement result by the ground injection station;
the digital signal processing unit simultaneously despreads and tracks spread spectrum signals which respectively comprise I, Q two paths of A, B ground injection station signals and 1 path of local zero-value signal and have 5 paths of code division;
the method comprises the steps of parallelly acquiring and tracking 5 channels in a GPU by adopting a streaming technology, and realizing signal decoding and pseudo-range measurement in a CPU so as to realize the consistency of processing time delay of a simulator and a real satellite using a DSP and FPGA combined architecture.
2. The processor simulator of claim 1, wherein the analog signal processing unit and the digital signal processing unit are connected by a high speed fiber.
3. The processor simulator of claim 2 wherein the high speed optical fiber has a transmission speed of 10 Gpbs.
4. The processor simulator of claim 1, wherein the frequency of the analog if signal is between 60MHz and 80 MHz.
5. The processor simulator of upper note reception of a navigation satellite of claim 1, wherein the analog signal processing unit comprises a coupling component, an amplification filtering component, a frequency conversion component and an AD sampling module, wherein:
the coupling component synthesizes a ground radio frequency signal and a closed loop signal generated by an upper injection analog source to form an upper injection radio frequency signal;
the amplifying and filtering component is used for filtering the upper injection radio frequency signal to remove high-frequency components, amplifying the upper injection radio frequency signal, outputting the upper injection radio frequency signal and adjusting the power of the upper injection radio frequency signal during output;
the frequency conversion component down-converts the up-injected radio frequency signal to the analog intermediate frequency signal;
and the AD sampling module carries out AD sampling on the analog intermediate frequency signal and converts the analog intermediate frequency signal into a digital intermediate frequency signal.
6. The naval satellite uplink injection receiving processor simulator of claim 5, wherein the frequency conversion component comprises a radio frequency filter, a mixer, and a local oscillator, wherein the radio frequency filter filters the uplink radio frequency signal, the local oscillator generates a local oscillator signal, and an antenna of the mixer receives the uplink radio frequency signal and mixes the uplink radio frequency signal with the local oscillator signal to obtain an analog intermediate frequency signal;
the amplifying and filtering component comprises an amplifier and a filter, the filter filters the upper injection radio frequency signal to remove high-frequency components, and the amplifier amplifies the upper injection radio frequency signal.
7. The processor simulator of the upper note receiving of the navigation satellite of claim 5, wherein the sampling rate of the AD sampling module is 375MHz, the number of sampling bits of the AD sampling module is 12 bits, and the AD sampling module has a temperature compensation function.
8. The processor simulator of upper note reception of a navigation satellite of claim 1, wherein said digital signal processing unit comprises a data information processing module and an interface communication module, wherein:
the data information processing module comprises a digital down-conversion module, an interference suppression module, a capturing channel, a tracking channel and an information demodulation and pseudo-range measurement module;
the digital intermediate frequency signal is converted into an I path orthogonal signal and a Q path orthogonal signal after passing through the digital down-conversion module, the I path orthogonal signal and the Q path orthogonal signal are subjected to interference signal removal through the interference suppression module, carrier removal, pseudo code de-spreading and data preprocessing are carried out through the capturing channel to obtain a related accumulated value, the related accumulated value is subjected to tracking processing through the tracking channel, and locking detection, data demodulation and pseudo range measurement operations are completed through the information demodulation and pseudo range measurement module;
the interface communication module is used for providing an interface for the data information processing module to communicate with the outside.
9. The processor simulator of an injection receiver on a navigation satellite of claim 8, wherein the information demodulation and pseudorange measurement module comprises a correlator, a received carrier numerically controlled oscillator, a received pseudocode numerically controlled oscillator, and a text demodulation module;
the correlator is used for finishing the correlation of the spread spectrum codes;
the receiving carrier wave numerically controlled oscillator is used for generating a carrier wave signal required by signal demodulation;
the receiving pseudo code numerically controlled oscillator is used for generating synchronous pseudo code chips required by the correlator;
the message demodulation module is used for signal demodulation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911178989.4A CN110824507B (en) | 2019-11-27 | 2019-11-27 | Simulator of upper note receiving processor of navigation satellite |
| CN202011149602.5A CN112213745A (en) | 2019-11-27 | 2019-11-27 | Satellite upper note receiving processor simulator based on GPU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911178989.4A CN110824507B (en) | 2019-11-27 | 2019-11-27 | Simulator of upper note receiving processor of navigation satellite |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011149602.5A Division CN112213745A (en) | 2019-11-27 | 2019-11-27 | Satellite upper note receiving processor simulator based on GPU |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110824507A CN110824507A (en) | 2020-02-21 |
| CN110824507B true CN110824507B (en) | 2020-11-10 |
Family
ID=69559835
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011149602.5A Pending CN112213745A (en) | 2019-11-27 | 2019-11-27 | Satellite upper note receiving processor simulator based on GPU |
| CN201911178989.4A Expired - Fee Related CN110824507B (en) | 2019-11-27 | 2019-11-27 | Simulator of upper note receiving processor of navigation satellite |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011149602.5A Pending CN112213745A (en) | 2019-11-27 | 2019-11-27 | Satellite upper note receiving processor simulator based on GPU |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112213745A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682880B (en) * | 2020-04-17 | 2021-04-23 | 中国人民解放军战略支援部队航天工程大学 | GPU-based streaming architecture broadband signal digital down-conversion system |
| CN112147648A (en) * | 2020-08-18 | 2020-12-29 | 中国计量科学研究院 | Software GNSS time frequency transfer receiver and time frequency transfer method thereof |
| CN112468222B (en) * | 2020-11-25 | 2021-09-24 | 中国科学院微小卫星创新研究院 | Environmental channel simulation system and method |
| CN112947521B (en) * | 2021-02-10 | 2022-10-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multifunctional simulation platform of spacecraft measurement and control system |
| CN113835774B (en) * | 2021-08-11 | 2023-03-21 | 中国电子科技集团公司第二十九研究所 | Efficient load software reconstruction method based on satellite-ground self-closed loop |
| CN114323072B (en) * | 2021-12-27 | 2024-02-06 | 航天恒星科技有限公司 | Dual-channel combined zero value real-time calibration device and method |
| CN115051721B (en) * | 2022-08-17 | 2022-11-04 | 中国人民解放军国防科技大学 | Multi-channel radio frequency receiving signal processing method and system based on software definition |
| CN116346197B (en) * | 2023-02-28 | 2024-03-19 | 北京扬铭科技发展有限责任公司 | UHF frequency band specific satellite signal analysis equipment and analysis method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202041640U (en) * | 2011-01-18 | 2011-11-16 | 西安理工大学 | Satellite navigation software receiver based on GPU |
| US20130290919A1 (en) * | 2012-04-27 | 2013-10-31 | Synopsys, Inc. | Selective execution for partitioned parallel simulations |
| CN102692633B (en) * | 2012-05-31 | 2014-01-15 | 北京空间飞行器总体设计部 | Satellite radio navigation service channel zero-value calibration system |
| CN103278829B (en) * | 2013-05-06 | 2015-09-02 | 东南大学 | A kind of parallel navigation method for tracing satellite signal based on GPU and system thereof |
| CN103760575A (en) * | 2014-01-15 | 2014-04-30 | 北京北斗星通导航技术股份有限公司 | Anti-interference Beidou satellite navigation receiver board card and receiver terminal thereof |
| CN104237913A (en) * | 2014-09-03 | 2014-12-24 | 北京一朴科技有限公司 | GNSS software receiver architecture system |
| CN104316938B (en) * | 2014-09-25 | 2016-10-19 | 上海欧科微航天科技有限公司 | A kind of New Satellite simulator for the plesiochronous communication system of low orbit satellite |
| CN104407358A (en) * | 2014-12-01 | 2015-03-11 | 长沙海格北斗信息技术有限公司 | Regenerative signal source for second-generation Beidou satellite signal and generating method thereof |
| CN105281802A (en) * | 2015-11-30 | 2016-01-27 | 武汉中元通信股份有限公司 | Broad-band radio frequency universal receiving/transmitting unit suitable for radio station |
| CN106774106A (en) * | 2016-11-22 | 2017-05-31 | 航天恒星科技有限公司 | Embedded satellite monitoring platform |
| CN107390236B (en) * | 2017-05-23 | 2023-03-31 | 青岛海信移动通信技术股份有限公司 | Satellite signal receiving device and method for processing received satellite signal |
| CN109782263B (en) * | 2018-12-11 | 2021-08-13 | 中国人民解放军63921部队 | Ka frequency channel multichannel high accuracy aerospace range finding transponder |
| CN109782314B (en) * | 2019-01-17 | 2023-07-21 | 山东航向电子科技有限公司 | GNSS satellite signal receiving hierarchical processing simulation experiment platform |
| CN110501722B (en) * | 2019-08-14 | 2021-11-23 | 上海卫星工程研究所 | Software defined in-orbit satellite simulator system and method |
-
2019
- 2019-11-27 CN CN202011149602.5A patent/CN112213745A/en active Pending
- 2019-11-27 CN CN201911178989.4A patent/CN110824507B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN110824507A (en) | 2020-02-21 |
| CN112213745A (en) | 2021-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110824507B (en) | Simulator of upper note receiving processor of navigation satellite | |
| CN101033974B (en) | Navigation satellite signal generating system based on software | |
| CN108333958B (en) | Multiplexing general aviation simulator | |
| US10101461B2 (en) | Radio frequency circuit structure for implementing function of converting GNSS satellite signal into baseband signal | |
| CN109581440A (en) | A kind of integrated distribution formula multisystem navigation signal processing platform | |
| CN110824508B (en) | Reconfigurable navigation satellite simulator | |
| CN110596657B (en) | Device for testing operation of distance measuring machine/Takang | |
| CN111669218B (en) | Inter-satellite link signal ground verification platform and method | |
| CN110988924A (en) | Anti-interference BDS/GPS receiver based on array antenna | |
| CN104734640A (en) | Frequency changing circuit and receiver board | |
| CN110850448B (en) | GPU-based zero value monitoring module and method for upper injection receiving processor simulator | |
| US20220299653A1 (en) | Radio frequency receiver for simultaneously processing multiple types of signals for positioning and method of operation | |
| CN103281114A (en) | Device and method for processing signals of pico-satellite transmitters | |
| CN103364810B (en) | By can saltus step navigation frequency point realize satellite navigation location devices and methods therefor | |
| CN110824509B (en) | Navigation satellite signal generation simulator | |
| CN206773180U (en) | Broadband radar target simulated radar echo equipment | |
| US11316656B1 (en) | Time transfer modem | |
| CN108649993A (en) | Whether there is or not communication signal transmissions delay measurement systems when plasma for one kind | |
| CN204465459U (en) | A kind of frequency changer circuit and receiver board | |
| CN111245502B (en) | Multimode pseudolite system | |
| CN204145474U (en) | A kind of Digital Intermediate Frequency Receiving System | |
| Barrak et al. | RF subsampling GNSS receiver: Potential advantages and feasibility study | |
| CN106772467B (en) | L frequency range uplink injection transmitting signal generating apparatus | |
| CN113078934B (en) | VHF measurement and control communication receiver based on micro-nano satellite platform and implementation method thereof | |
| CN117761734A (en) | Beidou navigation radio frequency interference signal generation method, device and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201110 Termination date: 20211127 |