CN109004950B - Data transmission system and spread spectrum measurement and control system for solving mutual interference of telemetering signals and data transmission signals - Google Patents
Data transmission system and spread spectrum measurement and control system for solving mutual interference of telemetering signals and data transmission signals Download PDFInfo
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- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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Abstract
The invention relates to a data transmission system and a spread spectrum measurement and control system for solving the mutual interference of a telemetering signal and a data transmission signal, which are based on a method for solving the mutual interference of the telemetering signal and the data transmission signal, and the method comprises the following steps: judging whether a first remote control instruction sent by the ground is received or not, if so, judging whether the first remote control instruction is a data signal downloading instruction or not, if so, starting a data transmission terminal and a phased array antenna, synthesizing a data transmission signal from an effective load and a telemetering signal from a spread spectrum measurement and control transponder in a digital system, and transmitting the synthesized signal to the ground through the phased array antenna by the data transmission terminal; if the first remote control command is not a data signal downloading command, one array element of the data transmission terminal and the phased array antenna is started, and the spread spectrum measurement and control transponder telemetering signals are transmitted to the ground through the started array element in the digital system. The invention solves the problem of mutual interference of the simultaneous downlink data transmission signal and the telemetering signal in the measurement and control area, and ensures the continuity and reliability of the satellite downlink telemetering signal.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a data transmission system and a spread spectrum measurement and control system for solving the mutual interference of a telemetering signal and a data transmission signal.
Background
In the current low-earth orbit satellite, an X-frequency band spread spectrum measurement and control system and a data transmission system are mostly two independent subsystems, the measurement and control system comprises a measurement and control transponder, a four-port network and a measurement and control antenna and mainly completes functions of remote measurement, remote control, tracking measurement and the like of the satellite, and the data transmission system comprises a data transmission terminal and a phased array antenna and mainly completes a downloading function of effective load data. Because the telemetering signals and the data transmission signals of the spread spectrum measurement and control transponder of the X frequency band are in the same frequency band, the frequency points of the two signals are adjacent, and the bandwidth and the intensity of the data transmission signals are far higher than those of the telemetering signals, when the satellite simultaneously performs the telemetering tasks and the data transmission tasks in a measurement and control area, the data transmission signals can interfere with the telemetering signals, so that the error rate of the telemetering signals received on the ground is increased, and the state of the satellite cannot be accurately judged.
The existing method for avoiding the mutual interference of the telemetering signal and the data transmission signal can reduce the signal-to-interference ratio of the data transmission signal to the telemetering signal by increasing the transmitting power of the X-frequency band spread spectrum measurement and control transponder. In addition, the influence on the telemetering signals can be reduced by increasing the polarization isolation degree of the measuring and controlling system and the data transmission system, but for the data transmission system with left and right rotary dual channels, the downlink data transmission signal rate can be reduced by half, and the transmission capability of effective load data is influenced.
Disclosure of Invention
Therefore, it is necessary to provide a data transmission system and a spread spectrum measurement and control system for solving the mutual interference between the telemetry signal and the data transmission signal, aiming at the problems that the existing method for avoiding the mutual interference between the telemetry signal and the data transmission signal has the problems that the spread spectrum measurement and control transponder has complicated structure due to higher thermal design difficulty and influences the output transmission capability of the payload.
In order to solve the problems, the invention adopts the following technical scheme:
a data transmission system and a spread spectrum measurement and control system for solving the mutual interference of a telemetry signal and a data transmission signal are disclosed, wherein the data transmission system and the spread spectrum measurement and control system are based on a method for solving the mutual interference of the telemetry signal and the data transmission signal, and the method comprises the following steps:
the method comprises the following steps: judging whether a first remote control instruction sent by the ground is received, if so, executing a second step;
step two: judging whether the first remote control instruction is a data signal downloading instruction or not, if so, executing a third step and a fourth step; if not, executing the fifth step and the sixth step;
step three: starting a data transmission terminal and a phased array antenna;
step four: synthesizing a data transmission signal from an active load and a telemetering signal from a spread spectrum measurement and control transponder in a digital system according to a preset power ratio, wherein the preset power ratio is the ratio of the power of the data transmission signal to the power of the telemetering signal, the synthesized signal is transmitted to the ground through the phased array antenna, and a star computer is respectively connected with the spread spectrum measurement and control transponder and the data transmission terminal through a CAN bus;
step five: starting an array element in a data transmission terminal and a phased array antenna;
step six: the data transmission terminal transmits a telemetering signal from a spread spectrum measurement and control transponder to the ground through the turned-on array element, and the house keeping computer is respectively connected with the spread spectrum measurement and control transponder and the data transmission terminal through a CAN bus;
the data transmission system and the spread spectrum measurement and control system comprise a left-handed phased array antenna, a first data transmission terminal, a right-handed phased array antenna, a second data transmission terminal, a first measurement and control antenna, a second measurement and control antenna, a four-port network, a first spread spectrum measurement and control transponder and a second spread spectrum measurement and control transponder;
the first digital transmission terminal is connected with the left-handed phased array antenna, and the second digital transmission terminal is connected with the right-handed phased array antenna;
the first measurement and control antenna and the second measurement and control antenna are respectively connected with the first spread spectrum measurement and control transponder and the second spread spectrum measurement and control transponder through the four-port network;
the house keeping computer is respectively connected with the first digital transmission terminal, the second digital transmission terminal, the first spread spectrum measurement and control transponder and the second spread spectrum measurement and control transponder through a CAN bus;
after receiving a first remote control instruction sent by the ground, the house service system judges whether the first remote control instruction is a data signal downloading instruction;
if yes, the satellite system starts the first data transmission terminal, the second data transmission terminal, the left-handed phased array antenna and the right-handed phased array antenna, data transmission signals from an effective load and telemetering signals from the first spread spectrum measurement and control transponder and the second spread spectrum measurement and control transponder are synthesized in the digital system, and the first data transmission terminal and the second data transmission terminal transmit the synthesized signals to the ground through the left-handed phased array antenna and the right-handed phased array antenna respectively;
if not, the satellite system starts one array element in the first digital transmission terminal and the left-handed phased array antenna, the telemetering signals of the first spread spectrum measurement and control transponder and the second spread spectrum measurement and control transponder of the first digital transmission terminal are transmitted to the ground through the started array element, or the satellite system starts one array element in the right-handed phased array antenna of the second digital transmission terminal, and the telemetering signals from the first spread spectrum measurement and control transponder and the second spread spectrum measurement and control transponder are transmitted to the ground through the started array element by the second digital transmission terminal.
In the data transmission system and the spread spectrum measurement and control system for solving the mutual interference of the telemetry signal and the data transmission signal, the downlink telemetry function of the spread spectrum measurement and control transponder is merged into the data transmission terminal, and the data transmission signal and the telemetry signal are synthesized in the digital system, so that the problem of mutual interference of the data transmission signal and the telemetry signal which are simultaneously downloaded in a measurement and control area is solved, the continuity and the reliability of the satellite downlink telemetry signal are ensured, and the reliability of receiving the telemetry information on the ground is ensured. Meanwhile, the invention solves the problem of mutual interference between the telemetering signal and the data transmission signal, and simultaneously can reasonably adjust the working state of the phased array antenna according to the corresponding task requirement, reduce the power consumption and the size of the spread spectrum measurement and control transponder, and simplify the interface function of the transponder.
Drawings
FIG. 1 is a schematic flow chart of a method for resolving the mutual interference between the telemetry signal and the data transmission signal according to the present invention;
fig. 2 is a schematic structural diagram of a data transmission system and a spread spectrum measurement and control system according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
In one embodiment, the invention discloses a method for solving the mutual interference of a telemetry signal and a data transmission signal, which comprises the following steps:
step one (S1): judging whether a first remote control instruction sent by the ground is received, if so, executing a second step, and if not, executing a fifth step and a sixth step;
step two (S2): judging whether the first remote control instruction is a data signal downloading instruction or not, if so, executing a third step and a fourth step; if not, executing the fifth step and the sixth step;
step three (S3): starting a data transmission terminal and a phased array antenna;
step four (S4): synthesizing a data transmission signal from an active load and a telemetering signal from a spread spectrum measurement and control answering system in a digital system, transmitting the synthesized signal to the ground through a phased array antenna, and respectively connecting a satellite computer with a spread spectrum measurement and control answering machine and a data transmission terminal through a CAN bus;
step five (S5): starting an array element in a data transmission terminal and a phased array antenna;
step six (S6): the data transmission terminal transmits the telemetering signals from the spread spectrum measurement and control transponder to the ground through the opened array elements, and the house keeping computer is respectively connected with the spread spectrum measurement and control transponder and the data transmission terminal through the CAN bus.
The data transmission terminal plays a role in downloading the telemetering signal and the data transmission signal of the effective load, and is specifically divided into two conditions for transmission:
(1) when the telemetering signal and the data transmission signal are simultaneously downloaded, the data transmission terminal receives telemetering information of a CAN bus and data from a payload, the telemetering signal and the data transmission signal are synthesized in a digital system, the power ratio of the synthesis of the two paths of signals is controlled, and a data transmission link is not influenced by the telemetering signal; the digital transmission terminal sends the synthesized signal to a phased array antenna, the phased array antenna transmits the signal to the ground, and after the signal is received on the ground, the telemetry signal is separated out after filtering and de-spreading at a receiving end;
(2) and when only the telemetering signal is downloaded, the data transmission terminal receives telemetering information from the CAN bus, modulates the telemetering information and transmits the modulated telemetering information to the phased array antenna for downloading. In this case, in order to save power consumption, the star system can control the array element opening state of the phased array antenna, and only one array element is kept to be opened, so that the link requirement of telemetering signal downloading can be met.
Specifically, as shown in fig. 1, the ground determines whether the satellite enters the measurement and control area according to the position information of the navigation receiver, and if it is determined that the satellite already enters the measurement and control area and the ground needs the satellite to perform a data transmission task, the ground sends a first remote control instruction to the satellite; if the satellite is in the measurement and control area, but the ground does not need to do data transmission tasks, the ground does not need to send a first remote control instruction to the satellite.
In the first step, the house service system judges whether a first remote control instruction sent by the ground is received. In the step, the satellite system can judge whether the satellite receives a first remote control instruction sent by the ground or not according to engineering parameters returned by the spread spectrum measurement and control transponder, and if the satellite system judges that the satellite receives the first remote control instruction, the second step is executed; if the satellite system judges that the satellite does not receive the first remote control instruction, whether the satellite is in the measurement and control area or not is judged according to the position information of the navigation receiver, if the satellite is in the measurement and control area, whether the first remote control instruction sent by the ground is received or not is judged again, and if the satellite is not in the measurement and control area, the satellite system does not operate.
In the second step, the house service system judges whether the first remote control instruction is a data signal downloading instruction. In the step, the satellite system receives first remote control instruction information transmitted by the spread spectrum measurement and control transponder through a CAN bus, judges whether the first remote control instruction is a data signal downloading instruction or not according to the content of the first remote control instruction information, and executes a third step and a fourth step if the first remote control instruction is the data signal downloading instruction; and if the command is not the command for downloading the data signal, executing the fifth step and the sixth step.
In step three, the data transmission terminal and the phased array antenna are turned on. And the star system sends an instruction to the data transmission terminal and the phased array antenna to enable the data transmission terminal and the phased array antenna to be powered on to work.
In step four, the data from the payload and telemetry information are synthesized and then downloaded. The data transmission terminal receives the telemetering signal on the CAN bus and the data from the effective load at the same time, synthesizes the two paths of signals in the digital system, transmits the synthesized signal to the phased array antenna, and transmits the synthesized signal to the ground by the phased array antenna. The digital system is a system for performing an operation on a digital quantity by using a digital signal, and is a part of a circuit in a data transmission terminal.
Furthermore, when the digital system synthesizes the data transmission signal and the telemetering signal, the digital system controls the power ratio of the two signals, and synthesizes the data transmission signal and the telemetering signal according to a preset power ratio to ensure that the two signals cannot influence each other during transmission, thereby solving the mutual interference problem of the two signals, wherein the preset power ratio is the ratio of the power of the data transmission signal to the power of the telemetering signal. Preferably, the preset power ratio may be 18 dB.
And in the fifth step, starting one array element in the data transmission terminal and the phased array antenna. When only the telemetering signal is downloaded, the satellite system starts the data transmission terminal, the data transmission terminal receives the telemetering signal from the CAN bus, and the telemetering signal is modulated and then sent to the phased array antenna for downloading. In this case, in order to save power consumption, the star system can control the array element opening state of the phased array antenna, and only one array element is kept to be opened, so that the link requirement of telemetering signal downloading can be met. The phased array antenna has a plurality of array elements, and one of the array elements can be started to work when only the telemetering signal is downloaded.
And in the sixth step, the telemetering signals are downloaded, and the telemetering signals from the CAN bus are transmitted to the ground through the array elements in the turned-on phased array antenna in the digital system.
Further, the working frequency bands of the data transmission terminal and the spread spectrum measurement and control transponder in this embodiment are both X frequency bands. The technical scheme of the invention is reasonable and easy to realize, and can meet the application requirements of the X-frequency band spread spectrum measurement and control system and the X-frequency band data transmission system of the low-orbit satellite.
The method for solving the mutual interference between the telemetry signal and the data transmission signal has the following beneficial effects:
(1) the downlink telemetering function of the spread spectrum measurement and control transponder is integrated into the data transmission terminal, and the data transmission signal and the telemetering signal are synthesized in the digital system, so that the problem of mutual interference of the data transmission signal and the telemetering signal which are simultaneously downloaded in a measurement and control area is solved, and the continuity and reliability of the satellite downlink telemetering signal are ensured;
(2) the synthesis of the telemetering signal and the data transmission signal is realized in a digital system, the power ratio of the two signals can be accurately controlled, and the influence of hardware is avoided;
(3) the data transmission terminal only relates to the change of software, and related devices and functions of the transmitter can be directly removed from the spread spectrum measurement and control transponder, so that the power consumption, the volume and the weight of the spread spectrum measurement and control transponder are reduced;
(4) the satellite can independently control the opening states of the data transmission terminal and the phased array antenna array element according to the task condition, and power consumption is reduced on the premise that the downlink remote measurement function is guaranteed.
As a specific implementation, as shown in fig. 1, after transmitting the synthesized signal to the ground through the phased array antenna in step four and transmitting the telemetry signal from the CAN bus to the ground through the turned-on array element in step six, the method further includes the following steps:
step seven (S7): and receiving a second remote control command sent by the ground, wherein the second remote control command is a data transmission stopping command and a remote measuring command. And the ground sends an uplink second remote control command, namely a data transmission stopping command and a remote measuring command, before the satellite leaves the measurement and control area according to the satellite position information, and the satellite performs corresponding operation by the satellite system after receiving the second remote control command, namely step eight is executed.
Step eight (S8): and turning off the data transmission terminal and the phased array antenna. And the star affair system sends an instruction, closes the working data transmission terminal and the phased array antenna, and stops downloading data transmission or telemetering data. After the satellite leaves the measurement and control area, the data transmission terminal and the phased array antenna are powered off, but the spread spectrum measurement and control transponder is in a power-on state.
In another embodiment, the invention further discloses a data transmission system and a spread spectrum measurement and control system based on the method for solving the mutual interference between the telemetry signal and the data transmission signal, wherein the data transmission system and the spread spectrum measurement and control system comprise a left-handed phased array antenna 1, a first data transmission terminal 2, a right-handed phased array antenna 3, a second data transmission terminal 4, a first measurement and control antenna 5, a second measurement and control antenna 6, a four-port network 7, a first spread spectrum measurement and control transponder 8 and a second spread spectrum measurement and control transponder 9.
Specifically, as shown in fig. 2, a first digital transmission terminal 2 is connected to a left-handed phased array antenna 1, and a second digital transmission terminal 4 is connected to a right-handed phased array antenna 3; the first measurement and control antenna 5 and the second measurement and control antenna 6 are respectively connected with a first spread spectrum measurement and control transponder 8 and a second spread spectrum measurement and control transponder 9 through a four-port network 7; the house keeping computer 10 is respectively connected with the first digital transmission terminal 2, the second digital transmission terminal 4, the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9 through the CAN bus.
After receiving a first remote control instruction sent by the ground, the house service system judges whether the first remote control instruction is a data signal downloading instruction, and executes corresponding operation according to a judgment result, wherein the specific operation is as follows:
if the satellite affair system judges that the first remote control instruction is a data signal downloading instruction, the satellite affair system starts a first data transmission terminal 2, a second data transmission terminal 4, a left-handed phased array antenna 1 and a right-handed phased array antenna 3, synthesizes a data transmission signal from an effective load 11 and a telemetering signal from a first spread spectrum measurement and control transponder 8 and a second spread spectrum measurement and control transponder 9 in the digital system, and transmits the synthesized signal to the ground through the left-handed phased array antenna 1 and the right-handed phased array antenna 3 by the first data transmission terminal 2 and the second data transmission terminal 4 respectively;
if the satellite system judges that the first remote control instruction is not a data signal downloading instruction, the satellite system starts one array element in the first data transmission terminal 2 and the left-handed phased array antenna 1, the first data transmission terminal 2 transmits the telemetering signals from the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9 to the ground through the array element started in the left-handed phased array antenna 1, or the satellite system starts one array element in the second data transmission terminal 4 and the right-handed phased array antenna 3, and the second data transmission terminal 4 transmits the telemetering signals from the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9 to the ground through the array element started in the right-handed phased array antenna 3.
In this embodiment, the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9 are in a backup relationship with each other, the first data transmission terminal 2 and the second data transmission terminal 4 both receive telemetry signals from the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9, the first data transmission terminal 2 synthesizes the data transmission signal and the telemetry signal in the digital system and transmits the data transmission signal down through the left-handed phased array antenna 1, the second data transmission terminal 4 synthesizes the data transmission signal and the telemetry signal in the digital system and transmits the data transmission signal down through the right-handed phased array antenna 3, the data transmission antenna and the data transmission terminal are in one-to-one correspondence, the first data transmission terminal 2 corresponds to the left-handed phased array antenna 1, and the second data transmission terminal 4 corresponds to the right-handed phased array antenna 3.
In the data transmission system and the spread spectrum measurement and control system of the embodiment, the spread spectrum measurement and control transponder cancels the transmitting function and only reserves the receiving function. In the original satellite system, remote control and remote measurement data of measurement and control are communicated through a CAN bus, a data transmission terminal is also hung on the same CAN bus and mainly used for receiving bus instruction frames and broadcast frames and returning engineering parameter frames, after the measurement and control of the embodiment cancels the remote measurement function, remote measurement information CAN be transmitted to the data transmission terminal through the CAN bus, the data transmission terminal synthesizes remote measurement signals and data transmission signals in a digital system, and then the synthesized signals are transmitted to the ground through a phased array antenna. The method for implementing the specific functions of each device in the data transmission system and the spread spectrum telemetry system of the present invention can refer to the implementation method described in the above method embodiments for solving the mutual interference between the telemetry signal and the data transmission signal, and is not described herein again.
As a specific implementation manner, after the satellite system receives the second remote control instruction sent by the ground, the second remote control instruction is a stop data transmission and telemetry instruction, and the satellite system turns off the first data transmission terminal 2 and/or the second data transmission terminal 4 and the working left-handed phased array antenna 1 and/or right-handed phased array antenna 3. The star affair system sends an instruction, the working data transmission terminal and the phased array antenna are closed, and when the first data transmission terminal 2 and the second data transmission terminal 4 simultaneously download the telemetering signal and the data transmission signal, the star affair system closes the first data transmission terminal 2, the second data transmission terminal 4, the working left-handed phased array antenna 1 and the working right-handed phased array antenna 3; when the first data transmission terminal 2 or the second data transmission terminal 4 only downloads the telemetry signal, the satellite system closes the first data transmission terminal 2 or the second data transmission terminal 4 and the working array element, when the satellite system closes the first data transmission terminal 2, the array element in the left-handed phased array antenna 1 is closed at the same time, and when the satellite system closes the second data transmission terminal 4, the array element in the right-handed phased array antenna 3 is closed at the same time. And after the satellite system closes the data transmission terminal and the phased array antenna, the data transmission terminal stops downloading data or telemetering data. After the satellite leaves the measurement and control area, the data transmission terminal and the phased array antenna are powered off, but the spread spectrum measurement and control transponder is in a power-on state.
Further, in this embodiment, when the digital system synthesizes the data transmission signal and the telemetry signal, the digital system controls the power ratio of the two signals, and synthesizes the data transmission signal and the telemetry signal according to the preset power ratio, so as to ensure that the two signals do not affect each other during transmission, and solve the mutual interference problem of the two signals, where the preset power ratio is the ratio of the power of the data transmission signal to the power of the telemetry signal. Preferably, the preset power ratio may be 18 dB.
Further, the working frequency bands of the first data transmission terminal 2, the second data transmission terminal 4, the first spread spectrum measurement and control transponder 8 and the second spread spectrum measurement and control transponder 9 in this embodiment are all X frequency bands. The technical scheme of the invention is reasonable and easy to realize, and can meet the application requirements of the X-frequency band spread spectrum measurement and control system and the X-frequency band data transmission system of the low-orbit satellite.
The following takes an X-band transmission system and an X-band spread spectrum measurement and control system as examples to describe the technical scheme of the present invention in detail. For the X frequency band, the frequency points of the spread spectrum measurement and control system and the data transmission system are adjacent (about 200 MH), and the frequency point of the spread spectrum measurement and control transponder is in the bandwidth of the data transmission signal. In the original system, the downward direction of the spread spectrum measurement and control transponder adopts a right-hand circular polarization mode, and the phased array antenna adopts a right-hand circular polarization mode and a left-hand circular polarization mode. Table 1 lists the link margin for downlink telemetry and data transmission signals for a satellite without the method of the present invention, where the phased array antenna is analyzed in right hand circular polarization. It can be seen from the table that, according to the index of the original system, the link margin of the data transmission signal meets the requirement, the telemetering signal link is mainly affected by the data transmission signal, and the link margin is-4.5 dB, which can not meet the requirement.
TABLE 1 original system Downlink analysis Table
| Name (R) | Unit of | Data transmission | Telemetry |
| Frequency of operation | GHz | X frequency band | X frequency band |
| In-band interference signal power | dBW | -157.07 | -165.67 |
| Signal to interference ratio S/J | dB | 35 | 8.6 |
| Link margin | dB | 8.65 | -4.5 |
The data transmission system and the spread spectrum measurement and control system designed according to the method of the invention cancel the transmitting function of the spread spectrum measurement and control system and only reserve the receiving function. In the invention, the synthesis of the telemetering signal and the data transmission signal is realized in a digital system, the power ratio of the two signals can be accurately controlled, and the control is not influenced by hardware. When the two signals are combined, the data transmission signal power to telemetry signal power ratio at which the data transmission link is not affected by the measurement may be selected to be 18 dB. For the measurement and control link, according to the power ratio of 18dB, if the total power of the data transmission signals output by the data transmission terminal is 5dBm, the total power of the output telemetry signals is-13 dBm. The power spectral density of the data transmission signal is-80.74 dBm/Hz, and the power spectral density of the telemetry signal is-80.88 dBm/Hz, so that the telemetry signal is submerged below the data transmission signal. The two paths of signals synthesized by the data transmission terminal are transmitted to the phased array antenna, and the phased array antenna transmits the signals to the ground. At the ground measurement and control receiving end, the signal-to-interference ratio of the receiving end after filtering and de-spreading is 25.6dB, and the requirement of a link can be met.
Table 2 lists the link margin for the downlink telemetry signal and the data transmission signal after the method of the present invention is performed, where the data transmission signal is analyzed on the right hand side.
Table 2 downlink analysis table of system after using the present invention
It can be analyzed from table 2 that, after the method of the present invention is adopted, both the downlink telemetry signal and the data transmission signal have sufficient link margin, which proves that the simultaneous transmission of the data transmission signal and the telemetry signal in the measurement and control area can be realized by the method of the present invention.
In the invention, when only the telemetering signals are downloaded in the measurement and control area of the satellite, the satellite system can control the opening number of the phased array antenna array elements, and the link margin requirement of the telemetering signals can be met by keeping the opening of one phased array antenna array element. Through calculation and analysis, when only the telemetering signal is downloaded, the link margin of the telemetering signal is 22.29dB, the margin is sufficient, and the requirement is met.
In conclusion, the invention has the characteristics of simple structure, easy realization and strong universality, and can be widely applied to satellite models for solving the mutual interference problem of various X-frequency-band data transmission and X-frequency-band measurement and control transponders. Various modifications and variations may be made in the design of the method of the present invention for resolving the mutual interference of telemetry signals and data transmission signals without departing from the essential scope of the invention by those skilled in the art. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A data transmission system and spread spectrum measurement and control system for solving the mutual interference of a telemetry signal and a data transmission signal are characterized in that the data transmission system and the spread spectrum measurement and control system are based on a method for solving the mutual interference of the telemetry signal and the data transmission signal, and the method comprises the following steps:
the method comprises the following steps: judging whether a first remote control instruction sent by the ground is received, if so, executing a second step;
step two: judging whether the first remote control instruction is a data signal downloading instruction or not, if so, executing a third step and a fourth step; if not, executing the fifth step and the sixth step;
step three: starting a data transmission terminal and a phased array antenna;
step four: synthesizing a data transmission signal from an active load and a telemetering signal from a spread spectrum measurement and control transponder in a digital system according to a preset power ratio, wherein the preset power ratio is the ratio of the power of the data transmission signal to the power of the telemetering signal, the synthesized signal is transmitted to the ground through the phased array antenna, and a star computer is respectively connected with the spread spectrum measurement and control transponder and the data transmission terminal through a CAN bus;
step five: starting an array element in a data transmission terminal and a phased array antenna;
step six: the data transmission terminal transmits a telemetering signal from a spread spectrum measurement and control transponder to the ground through the turned-on array element, and the house keeping computer is respectively connected with the spread spectrum measurement and control transponder and the data transmission terminal through a CAN bus;
the data transmission system and the spread spectrum measurement and control system comprise a left-handed phased array antenna (1), a first data transmission terminal (2), a right-handed phased array antenna (3), a second data transmission terminal (4), a first measurement and control antenna (5), a second measurement and control antenna (6), a four-port network (7), a first spread spectrum measurement and control transponder (8) and a second spread spectrum measurement and control transponder (9);
the first data transmission terminal (2) is connected with the left-handed phased array antenna (1), and the second data transmission terminal (4) is connected with the right-handed phased array antenna (3);
the first measurement and control antenna (5) and the second measurement and control antenna (6) are respectively connected with the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) through the four-port network (7);
the star computer (10) is respectively connected with the first digital transmission terminal (2), the second digital transmission terminal (4), the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) through a CAN bus;
after receiving a first remote control instruction sent by the ground, the house service system judges whether the first remote control instruction is a data signal downloading instruction;
if yes, the satellite system starts the first data transmission terminal (2), the second data transmission terminal (4), the left-handed phased array antenna (1) and the right-handed phased array antenna (3), data transmission signals from an effective load (11) and telemetering signals from the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) are synthesized in the digital system, and the first data transmission terminal (2) and the second data transmission terminal (4) transmit the synthesized signals to the ground through the left-handed phased array antenna (1) and the right-handed phased array antenna (3) respectively;
if not, the satellite system starts one array element of the first data transmission terminal (2) and the left-handed phased array antenna (1), the first data transmission terminal (2) transmits the telemetry signals from the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) to the ground through the started array element, or the satellite system starts one array element of the second data transmission terminal (4) and the right-handed phased array antenna (3), and the second data transmission terminal (4) transmits the telemetry signals from the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) to the ground through the started array element.
2. The data transmission system and spread spectrum measurement and control system according to claim 1,
after the satellite system receives a second remote control instruction sent by the ground, the second remote control instruction is a data transmission stopping and remote measuring instruction, and the satellite system closes the first data transmission terminal (2) and/or the second data transmission terminal (4) and the working left-handed phased array antenna (1) and/or right-handed phased array antenna (3).
3. The data transmission system and spread spectrum measurement and control system according to claim 1 or 2,
and the first digital transmission terminal (2) or the second digital transmission terminal (3) synthesizes the digital transmission signal and the telemetering signal in the digital system according to a preset power ratio, wherein the preset power ratio is the ratio of the power of the digital transmission signal to the power of the telemetering signal.
4. The data transmission system and spread spectrum measurement and control system according to claim 3,
the preset power ratio is 18 dB.
5. The data transmission system and spread spectrum measurement and control system according to claim 1 or 2,
the working frequency bands of the first data transmission terminal (2), the second data transmission terminal (4), the first spread spectrum measurement and control transponder (8) and the second spread spectrum measurement and control transponder (9) are X frequency bands.
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| CN202632091U (en) * | 2012-03-26 | 2012-12-26 | 航天东方红卫星有限公司 | Three-satellite constellation distributed parallel test system |
| CN107968678A (en) * | 2017-11-27 | 2018-04-27 | 长光卫星技术有限公司 | A kind of New Satellite high speed data transmission system |
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| CN105894773A (en) * | 2016-04-20 | 2016-08-24 | 上海微小卫星工程中心 | Method and system for satellite telemetry speed increasing and load data fusion |
| CN106559128B (en) * | 2016-10-14 | 2019-07-19 | 上海微小卫星工程中心 | Integrated communication device and method for microsatellite |
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| CN202632091U (en) * | 2012-03-26 | 2012-12-26 | 航天东方红卫星有限公司 | Three-satellite constellation distributed parallel test system |
| CN107968678A (en) * | 2017-11-27 | 2018-04-27 | 长光卫星技术有限公司 | A kind of New Satellite high speed data transmission system |
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Address after: No. 1299, Mingxi Road, Beihu science and Technology Development Zone, Changchun City, Jilin Province Patentee after: Changguang Satellite Technology Co.,Ltd. Address before: No.1759 Mingxi Road, Gaoxin North District, Changchun City, Jilin Province Patentee before: CHANG GUANG SATELLITE TECHNOLOGY Co.,Ltd. |
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Denomination of invention: Data transmission system and spread spectrum measurement and control system to solve the interference between telemetry signals and data transmission signals Granted publication date: 20200616 Pledgee: Jilin Province Trust Co.,Ltd. Pledgor: Changguang Satellite Technology Co.,Ltd. Registration number: Y2024220000062 |
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