CN115085793A - Low-orbit mobile communication satellite tracking device and tracking method - Google Patents
Low-orbit mobile communication satellite tracking device and tracking method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
- H04L27/2272—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals using phase locked loops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2334—Demodulator circuits; Receiver circuits using non-coherent demodulation using filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a low-orbit mobile communication satellite tracking device and a tracking method, wherein the tracking device comprises a tracking main road, a tracking branch road, a tracking signal processing unit, an antenna control unit and an antenna driving unit; the tracking main circuit forms a main feed signal; the tracking branch forms a plurality of branch radio frequency signals; the tracking signal processing unit resolves and receives the main feed source signal and the branch radio frequency signals to obtain a main feed source amplitude signal and branch radio frequency amplitude signals; the antenna control unit calculates the deviation between the received main feed source amplitude signal and the plurality of branch radio frequency amplitude signals and determines a driving parameter according to the deviation; and the antenna driving unit drives the antenna to move according to the driving parameters. According to the method and the device, the branch radio frequency amplitude signals of a plurality of directions relative to the antenna main shaft are obtained, the deviation of the main feed source and the branch radio frequency amplitude signals is obtained, the antenna is driven to move, effective tracking of the low-orbit mobile communication satellite is achieved, and the problem of tracking of the low-orbit mobile communication satellite by the small-caliber antenna is solved.
Description
Technical Field
The application relates to a low-orbit mobile communication satellite tracking device and a tracking method, belonging to the field of satellite communication.
Background
At present, most communication satellites are synchronous satellites, stepping tracking and program tracking systems are basically adopted for tracking the synchronous satellites at home and abroad, and only large-aperture antennas and high-frequency communication antennas are adoptedBy TE 21 The mode monopulse tracking technology, such as remote sensing, resource polar orbit and inclined orbit satellite tracking, all adopt TE 21 And a mode single pulse tracking technology is adopted to realize the tracking of the satellite target.
Low-earth orbit mobile communication satellites (inclined orbit satellites) will be an important component of the next generation mobile communication networks. Because the low-orbit mobile communication satellite has low orbit, high running speed and narrow high-frequency (Ka) beam, the precision of an application program for tracking and stepping the tracking satellite target is poor, and particularly, the stepping tracking is difficult to track. TE adopted by monopulse tracking technology 21 The mold tracking equipment is complex, large in size, high in processing and production cost and insufficient in installation space of the small-caliber antenna. In addition, the phase shift of the single pulse tracking and difference branch circuit changes with frequency, polarization, temperature and the like, so that cross coupling is generated, the tracking of the system is unstable, and tracking cannot be performed in serious cases, so that phase calibration and sum-difference phase adjustment are required to be performed frequently.
Disclosure of Invention
According to one aspect of the application, the low-orbit mobile communication satellite tracking device and the tracking method are provided, through acquiring radio frequency amplitude signals of a plurality of directions relative to an antenna main shaft, the deviation of a main feed source and a plurality of branch radio frequency amplitude signals is acquired, the antenna is driven to move, the effective tracking of the low-orbit mobile communication satellite is realized, and the problem of tracking the low-orbit mobile communication satellite by a small-caliber antenna is solved.
The low-orbit mobile communication satellite tracking device is characterized by comprising a tracking main road, a tracking branch road, a tracking signal processing unit, an antenna control unit and an antenna driving unit;
the tracking main path comprises a main loudspeaker and a main feed source, the main loudspeaker is used for reflecting a satellite signal to the main feed source, and the main feed source receives the satellite signal to form a main feed source signal;
the tracking branch comprises a plurality of radio frequency units arranged around the main loudspeaker, and the radio frequency units are used for receiving satellite signals in different directions to form a plurality of branch radio frequency signals;
the tracking signal processing unit resolves and receives the main feed source signal and the branch radio-frequency signals to obtain a main feed source amplitude signal and branch radio-frequency amplitude signals;
the antenna control unit calculates the deviation between the received main feed source amplitude signal and the plurality of branch radio frequency amplitude signals, and determines a driving parameter according to the deviation;
and the antenna driving unit drives the antenna to move according to the driving parameters.
Optionally, the main trace path further includes a power divider;
the power divider is positioned between the main feed source and the tracking signal processing unit and is used for dividing and outputting a main feed source signal into two paths of signals, wherein one path of signal is used for communication; the other path of signal is transmitted to a tracking signal processing unit for signal resolving;
the tracking main circuit further comprises a first filter and a first low-noise down-conversion amplifier;
the first filter carries out filtering processing on the primary feed source signal before power division;
and the first low-noise down-conversion amplifier amplifies and frequency-converts the filtered primary feed source signal.
Optionally, the radio frequency unit includes an auxiliary horn, an auxiliary feed source, and a polarizer;
the auxiliary horn is used for reflecting a satellite signal in a certain direction to the auxiliary feed source;
the auxiliary feed source collects satellite signals of a certain direction to form auxiliary feed source signals of the direction;
the polarizer is used for polarizing the received auxiliary feed source signal to obtain a polarized signal, and transmitting the polarized signal to the tracking signal processing unit.
Optionally, four radio frequency units are provided;
the four auxiliary horns are respectively arranged at four positions of the antenna main shaft.
Optionally, the tracking branch further comprises a multi-way selector switch;
the plurality of radio frequency units are respectively connected with the multi-path selection switch, and the multi-path selection switch is used for selecting branch radio frequency signals in a time-sharing mode to enter the tracking signal processing unit, so that the plurality of branch radio frequency signals enter the tracking signal processing unit in sequence to be resolved one by one.
Optionally, the tracking branch further comprises a second filter and a second low noise down-conversion amplifier;
the second filter carries out filtering processing on the branch radio-frequency signal before entering the tracking signal processing unit;
and the second low-noise down-conversion amplifier amplifies and converts the branch radio-frequency signals after filtering.
Optionally, the tracking signal processing unit includes a main path signal adjusting unit, a branch path signal adjusting unit, and a baseband processing unit, which are connected in sequence;
the main path signal adjusting unit and the branch path signal adjusting unit respectively comprise an orthogonal demodulator and an A/D converter;
the orthogonal demodulator is used for demodulating the received primary feed source signal/branch radio frequency signal;
the A/D converter is used for converting the demodulated main feed source signal/branch radio frequency signal into a digital signal;
and the baseband processing unit calculates the received digital signals to obtain a main feed source amplitude signal and a plurality of branch radio frequency amplitude signals.
Optionally, the main path signal adjusting unit and the branch path signal adjusting unit both further include a third filter, and the third filter performs filtering processing on the main feed source signal/branch path radio frequency signal before demodulation.
Optionally, the tracking signal processing unit further comprises a switching signal generator or/and an AGC control unit;
the switch signal generator is respectively connected with the multi-way switch and the baseband processing unit, and the baseband processing unit controls the switch signal generator to send a switch control signal and controls the multi-way switch to realize that a plurality of branch radio-frequency signals are selected in a time-sharing manner and enter the baseband processing unit in sequence;
and the AGC control unit is respectively connected with the quadrature demodulator and the baseband processing unit and is used for carrying out automatic gain control on the signals input into the baseband processing unit.
According to yet another aspect of the present application, there is provided a low-earth orbit mobile communication satellite tracking method, the method comprising at least the steps of:
resolving a plurality of branch radio frequency signals in different directions around the main loudspeaker to obtain a plurality of branch radio frequency amplitude signals;
step 2, determining the deviation between the main feed source amplitude signal and the plurality of branch radio frequency amplitude signals, and determining a driving parameter according to the deviation;
and 3, driving the antenna to move according to the driving parameters.
Optionally, the main feed amplitude signal obtaining method includes:
converting the primary feed source amplitude signal into a primary feed source L frequency band signal;
I/Q demodulation is carried out on the L frequency band signal of the main feed source, and the L frequency band signal of the main feed source is converted into a zero intermediate frequency I/Q signal of the main feed source;
converting the I/Q signal into I/Q data;
and resolving the I/Q data to obtain main feed source signal power, namely the main feed source amplitude signal/branch radio frequency amplitude signal.
Optionally, the tracking method further comprises: before the primary feed source signal is resolved, the primary feed source signal is divided into a communication signal and a beacon signal for resolving.
Optionally, the multiple branch radio frequency amplitude signal obtaining method includes:
controlling the branch radio-frequency signals to be converted into branch radio-frequency L frequency band signals in sequence in a time-sharing manner;
carrying out IQ demodulation on the branch radio frequency L frequency band signals in sequence, and converting the branch radio frequency L frequency band signals into a plurality of branch radio frequency I/Q signals with zero intermediate frequency;
sequentially converting the plurality of I/Q signals into a plurality of I/Q data;
and resolving the I/Q data to obtain the power of the branch radio-frequency signals, namely the branch radio-frequency amplitude signals.
Optionally, the solution method includes:
performing AGC control on the I/Q data according to the power estimation value;
carrying out frequency estimation on the I/Q data to obtain a frequency estimation value;
guiding a phase-locked loop to lock a tracking signal by using the frequency estimation value;
after the phase-locked loop locks the tracking signal, adopting Q-path output to calculate the signal power:
wherein:
n is the total number of sampling points in one period;
S q the signal power of each point collected by the Q path.
Optionally, the phase-locked loop uses Q-way phase detection.
The beneficial effects that this application can produce include:
1) the device solves the problem of effectively tracking the low-orbit mobile communication satellite target by the small-caliber antenna.
2) The device is added with a plurality of radio frequency units, and the generated signals can be cross-coupled without influencing the tracking stability
3) In the device of the application, the tracking branch is relative to TE 21 The price of the module monopulse tracking branch is greatly reduced.
4) According to the tracking method, the amplitude deviation of the main feed source signal and the radio frequency unit signals of the multiple branches is obtained by obtaining the radio frequency amplitude signals in multiple directions relative to the antenna main shaft, the antenna is driven to move towards the direction with the reduced deviation, and effective tracking of the low-orbit mobile communication satellite is achieved.
Drawings
FIG. 1 is a schematic structural diagram of a low-earth-orbit mobile communication satellite tracking device according to the present application;
FIG. 2 is a schematic diagram of the structure and signal processing principle of a tracking signal processing unit in the tracking device of the present application;
FIG. 3 is a diagram of gated time distribution of time division channels in the implementation of the method of the present application;
FIG. 4 is a schematic view of a gain adjustment process in the method of the present application;
FIG. 5 is a linear phase model of a phase-locked loop in tracking signal processing according to the present application;
fig. 6 is a phase-locked loop phase discrimination flowchart in the tracking signal processing of the present application;
fig. 7 is a flowchart of tracking in the prior art.
In the figure, 1, a main feed source, 2, a first filter, 3, a first low-noise down-conversion amplifier, 4, a main horn, 5, an auxiliary horn, 6, a polarizer, 7, a multi-way selection switch, 8, a second filter, 9, a second low-noise down-conversion amplifier, 10, a power divider, 11, a tracking signal processing unit, 12, an antenna control unit, 13 and an antenna driving unit.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The low-orbit mobile communication satellite tracking device comprises a tracking main path, a tracking branch path, a tracking signal processing unit 11, an antenna control unit 12 and an antenna driving unit 13, wherein the tracking main path is connected with the tracking branch path through a cable;
the main tracking path comprises a main loudspeaker 4 and a main feed source 1, wherein the main loudspeaker 4 is used for reflecting a satellite signal to the main feed source 1, and the main feed source 1 receives the satellite signal to form a main feed source signal;
the tracking branch comprises a plurality of radio frequency units arranged around the main loudspeaker, and the radio frequency units are used for receiving satellite signals in different directions to form a plurality of branch radio frequency signals;
the tracking signal processing unit 11 resolves and receives the primary feed source signal and the plurality of branch radio frequency signals to obtain a primary feed source amplitude signal and a plurality of branch radio frequency amplitude signals;
the antenna control unit 12 calculates a deviation between the received main feed amplitude signal and the plurality of branch rf amplitude signals, and determines a driving parameter according to the deviation;
the antenna driving unit 13 drives the antenna to move according to the driving parameters.
The driving parameters are data of the antenna moving towards the direction of reducing the deviation.
The tracking main path further comprises a power divider 10;
the power divider 10 is located between the primary feed source 1 and the tracking signal processing unit 11, and is configured to divide and output a primary feed source signal into two signals, where one signal is used for communication; the other path of signal is transmitted to a tracking signal processing unit for signal resolving;
the tracking main circuit also comprises a first filter 2 and a first low-noise down-conversion amplifier 3;
the first filter 2 carries out filtering processing on the primary feed source signal before power division;
and the first low-noise down-conversion amplifier 3 amplifies and frequency-converts the filtered primary feed source signal.
The radio frequency unit comprises an auxiliary loudspeaker 5, an auxiliary feed source and a polarizer 6;
the auxiliary loudspeaker 5 is used for reflecting a satellite signal in a certain direction to the auxiliary feed source;
the auxiliary feed source collects satellite signals of a certain direction to form auxiliary feed source signals of the direction;
the polarizer 7 is configured to polarize the received auxiliary feed source signal to obtain a polarized signal, and transmit the polarized signal to the tracking signal processing unit 11;
in a specific implementation process, four radio frequency units are arranged;
the four auxiliary horns 5 are respectively installed at four positions (i.e. up, down, left and right) of the antenna main shaft.
The auxiliary horn is a Ka frequency range horn and is used for receiving Ka frequency range signals corresponding to four directions of the upper direction, the lower direction, the left direction and the right direction of the antenna main shaft.
The tracking branch further comprises a multi-way selector switch 7;
the multiple radio frequency units are respectively connected with the multiple-way selection switch 7, and the multiple-way selection switch 7 is used for selecting branch radio frequency signals in a time-sharing manner to enter the tracking signal processing unit 11, so that the multiple branch radio frequency signals enter the tracking signal processing unit in sequence to be resolved one by one;
the tracking branch further comprises a second filter 8 and a second low noise down-conversion amplifier 9;
the second filter 8 performs filtering processing on the branch radio frequency signal before entering the tracking signal processing unit 11;
and the second low-noise down-conversion amplifier 9 amplifies and frequency-converts the branch radio-frequency signals after filtering.
The first low-noise down-conversion amplifier 3 and the second low-noise down-conversion amplifier 9 are configured to amplify the received signal and convert the signal to the L-band.
As shown in fig. 2, the tracking signal processing unit includes a main path signal adjusting unit, a branch path signal adjusting unit, and a baseband processing unit, which are connected in sequence;
the main signal adjusting unit and the branch signal adjusting unit respectively comprise an orthogonal demodulator and an A/D converter;
the orthogonal demodulator is used for demodulating the received primary feed source signal/branch radio frequency signal;
the A/D converter is used for converting the demodulated primary feed source signal/branch radio frequency signal into a digital signal;
the baseband processing unit calculates the received digital signals to obtain a main feed source amplitude signal and a plurality of branch radio frequency amplitude signals;
the main path signal adjusting unit and the branch path signal adjusting unit both further comprise a third filter, and the third filter carries out filtering processing on the main feed source signal/branch path radio frequency signal before demodulation;
the tracking signal processing unit also comprises a switching signal generator or/and an AGC control unit;
the switch signal generator is respectively connected with the multi-way switch and the baseband processing unit, and the baseband processing unit controls the switch signal generator to send a switch control signal and controls the multi-way switch to realize that a plurality of branch radio-frequency signals are selected in a time-sharing manner and enter the baseband processing unit in sequence;
and the AGC control unit is respectively connected with the quadrature demodulator and the baseband processing unit and is used for carrying out automatic gain control on the signals input into the baseband processing unit.
The application relates to a low-orbit mobile communication satellite tracking method, which at least comprises the following steps:
on a tracking main path, after a main feed source signal is amplified and converted into an L-frequency band signal, the signal enters a power divider and is divided into two paths, wherein one path is used as a communication signal and is used for communication; and the other path of signal enters a tracking signal processing unit as a beacon signal to be subjected to signal processing to obtain a main feed source amplitude signal.
On the tracking branch, branch radio-frequency signals received by the four secondary loudspeakers are respectively polarized, the multi-path selection switch selects one branch of signals in a time-sharing mode, the signals are amplified and converted into L-band signals, and then the signals enter the tracking signal processing unit in a time-sharing mode to be processed to respectively obtain four branch radio-frequency amplitude signals.
And the antenna control unit receives and compares the deviation between the main feed source amplitude signal and the four branch radio frequency amplitude signals, and controls the antenna driving unit to drive the antenna to move towards the direction with reduced deviation.
The deviations include azimuth, pitch, etc.
The format of the L-band signal to be processed is:
S n ＝A n *cos(ωt+θ n )
wherein: a. the n The amplitude of the nth signal is obtained; ω is the carrier frequency (Ka frequency); t is time; theta n Is the channel phase.
After the L frequency band signal is filtered and amplified by a pre-stage, I/Q demodulation is carried out, and the L frequency band signal is converted into a main feed source I/Q signal of zero intermediate frequency or a branch radio frequency I/Q signal;
the tracking signal processing unit has the main functions of demodulating the channel signal in the digital domain and estimating the residual frequency offset f △ Tracking phase theta n And calculates the channel signal power.
In the signal processing process of the tracking signal processing unit, the L-frequency band signal of the main feed source and the L-frequency band signal of the radio frequency of the four branches are respectively and independently resolved. The main process comprises the following steps: performing power estimation on the I/Q signal, and performing AGC (automatic gain control) according to an estimation result; the I/Q signals are subjected to digital preprocessing (including bias correction, filtering and other processing), and then frequency estimation, phase tracking and power calculation are carried out on the processed data, so that power values of corresponding signals are obtained finally.
The signal processing process is as follows:
1. switch signal selection
And the baseband processing unit generates a switch control quantity to control the multiplexer to select signals of different auxiliary feed source channels in a time-sharing manner to enter the auxiliary channel for beacon power estimation. To reduce the lag error due to the antenna tracking the low orbit mobile satellite, the data transmission rate is selected to be 20C/sec, i.e. within 50ms, according to the satellite motion speed, and the time distribution is shown in fig. 3. The on-time for each refresh cycle is 12.5ms for each secondary feed channel. The baseband processing unit must complete AGC lock within 12.5ms and estimate the power accurately. The window time for beacon power estimation is about 8.5 ms.
2. Automatic gain control (AGC control)
The purpose of automatic gain is to quickly adjust the gain of the rf front end and ensure that the signal arrival power is appropriate. When the switching signal gates different channels, there may be large jumps in signal power. In order to quickly adjust the signal to a proper power, the latest gain adjustment value of the gating channel can be used as a basis, and on the basis, the gain adjustment is carried out according to the latest calculated channel power. To avoid severe overload of the switched power front-end input, the target power for the automatic gain adjustment is-12 dBFS. After the gating channel is determined, gain adjustment control is performed on the incoming channel signal, and the gain adjustment process is shown in fig. 4:
taking the gain control value of the channel which is the latest (last) time as the initial gain control value, and taking the difference value from the target power as the initial gain control value, and controlling the signal gain by the gain control value;
after the gain is stable, calculating the channel power according to the ADC sampling value (namely the collected signal power of each point of the channel);
adjusting a gain control value according to the channel power calculation result to enable the adjusted gain control value to meet the channel requirement; the gain control value is saved, so that the next gain adjustment control of the channel is facilitated.
And after the channel is switched, repeating the operation and carrying out gain adjustment control on the corresponding channel signal.
Channel power P 1 The calculation is as follows:
in the formula, s i And s q And respectively representing the power sampling values of the I path signal and the Q path signal. In the embodiment of the application, the number of sampling points is 1024, the sampling duration is 2.048ms according to the 500ksps sampling rate.
3. Beacon signal (tracking signal) processing flow
The beacon signal processing is carried out according to the procedures of frequency estimation, phase tracking and power calculation.
1) Frequency estimation
And adopting 4096-point FFT to carry out frequency estimation on the 500ksps sampling point, wherein the frequency estimation value is used for guiding the phase-locked loop to quickly lock a tracking signal in phase tracking.
The theoretical accuracy of the frequency estimation is:
f e ＝500000/4096/2＝61Hz
2) phase tracking
Phase tracking uses a phase locked loop whose linear phase model is shown in fig. 5.
The loop filter plays a very important role in the phase locked loop. Which determines to a large extent the noise performance, acquisition and tracking performance, etc. of the loop. In the present application, the loop filter usually employs an active proportional integral filter, and the S (domain) transfer function has the following form:
in the formula: s is an S domain variable;
τ 1 、τ 2 filter control parameters are respectively calculated;
τ 1 ＝R 1 C 1 、τ 2 ＝R 2 C 2 ；
R 1 、R 2 、C 1 、C 2 respectively a resistance value and a capacitance value.
The expression of the Z domain is as follows:
wherein, C 1 As a proportional control coefficient, C 2 Z is a Z domain variable for the integral control coefficient.
The phase-locked loop adopts Q-path phase discrimination, and the phase discrimination flow is shown in figure 6:
starting to initialize an oscillator NCO of the digital controller to enable an initial phase to be 0; the NCO outputs a digital signal and the input signal S of the Q branch is multiplied in a conjugate mode to generate a phase identifying quantity img; filtering the input noise by the loop filter to suppress the generated error by the phase identifying quantity, and accumulating to form e; the accumulated quantity is integrated and accumulated to generate a new phase value phs of the NCO to control the NCO. After phase discrimination is carried out in a continuous cycle, when the phase difference between the NCO signal and the input signal keeps a certain constant value, the loop is in a locking state.
3) Power calculation
After the phase-locked loop is locked, Q-path output is adopted, the signal power P is calculated, multipoint accumulation average can be used during calculation, and the calculation formula is as follows:
wherein: the signal power P is the accumulated average value of the multipoint signal power in one period;
n is the total number of sampling points in one period;
S q the signal power of each point collected by the Q path.
The method and the device have the advantages that branch radio frequency signals of the auxiliary feed sources around the main feed source are collected, branch radio frequency amplitude signals in four directions relative to the antenna main shaft are obtained, amplitude deviation of the main feed source signals and the branch radio frequency unit signals is obtained, the antenna is driven to move towards the direction with the reduced deviation, and effective tracking of the small-caliber antenna on the low-orbit mobile communication satellite is achieved. Meanwhile, the method of the application tracks the branch to obtain the branch radio frequency amplitude signal relative to the antenna main shaft in four directions, which is different from TE 21 The mode monopulse tracking branch circuit needs to acquire the azimuth and pitch radio frequency error of the antenna deviating from the target and demodulate the azimuth and pitch angle error voltage of the antenna deviating from the target. Thus reducing the complexity of TE 21 A mode tracking coupler (8 groups of equant circular hole combinations are processed on a circular waveguide thin wall along the cross section direction, the processing consistency and the symmetry precision of the 8 groups are high, each group of circular hole combination at least comprises 24 different circular holes, and the design and processing cost is high), a tracking error synthesis network, a coupler, a phase-shifting and modulating network, a single-channel synthesis network and other microwave equipment; in addition, the azimuth and pitch angle error voltage of the antenna deviating from the target does not need to be demodulated, and the demodulation equipment is tracked relative to TE 21 The modulo single pulse tracking demodulation device is much simpler (the existing tracking flow is shown in fig. 7). Performing a tracking process to track branch versus TE 21 The cost price of the mode single pulse tracking is greatly reduced.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A low-orbit mobile communication satellite tracking device is characterized in that the tracking device comprises a tracking main road, a tracking branch road, a tracking signal processing unit, an antenna control unit and an antenna driving unit;
the tracking main path comprises a main horn and a main feed source, the main horn is used for reflecting a satellite signal to the main feed source, and the main feed source receives the satellite signal to form a main feed source signal;
the tracking branch comprises a plurality of radio frequency units arranged around the main loudspeaker, and the radio frequency units are used for receiving satellite signals in different directions to form a plurality of branch radio frequency signals;
the tracking signal processing unit resolves and receives the main feed source signal and the branch radio frequency signals to obtain a main feed source amplitude signal and branch radio frequency amplitude signals;
the antenna control unit calculates the deviation between the received main feed source amplitude signal and the plurality of branch radio frequency amplitude signals, and determines a driving parameter according to the deviation;
and the antenna driving unit drives the antenna to move according to the driving parameters.
2. The low-orbit mobile communication satellite tracking device according to claim 1, wherein the tracking main road further includes a power divider;
the power divider is positioned between the main feed source and the tracking signal processing unit and is used for dividing and outputting a main feed source signal into two paths of signals, wherein one path of signal is used for communication; the other path of signal is transmitted to a tracking signal processing unit for signal resolving;
the tracking main circuit further comprises a first filter and a first low noise down-conversion amplifier;
the first filter carries out filtering processing on the primary feed source signal before power division;
and the first low-noise down-conversion amplifier amplifies and frequency-converts the filtered primary feed source signal.
3. The low-orbit mobile communication satellite tracking device of claim 1, wherein the radio frequency unit comprises an auxiliary horn, an auxiliary feed source and a polarizer;
the auxiliary loudspeaker is used for reflecting a satellite signal in a certain direction to the auxiliary feed source;
the auxiliary feed source collects satellite signals of a certain direction to form auxiliary feed source signals of the direction;
the polarizer is used for polarizing the received auxiliary feed source signal to obtain a polarized signal and transmitting the polarized signal to the tracking signal processing unit;
the number of the radio frequency units is four;
the four auxiliary horns are respectively arranged at four positions of the antenna main shaft.
4. The low-orbit mobile communication satellite tracking device of claim 1, wherein the tracking branch further comprises a multi-way selector switch;
the plurality of radio frequency units are respectively connected with the multi-path selection switch, and the multi-path selection switch is used for selecting branch radio frequency signals in a time-sharing manner to enter the tracking signal processing unit, so that the plurality of branch radio frequency signals enter the tracking signal processing unit in sequence to be resolved one by one;
the tracking branch further comprises a second filter and a second low noise down-conversion amplifier;
the second filter carries out filtering processing on the branch radio-frequency signal before entering the tracking signal processing unit;
and the second low-noise down-conversion amplifier amplifies and converts the branch radio-frequency signals after filtering.
5. The low-orbit mobile communication satellite tracking device according to claim 4, wherein the tracking signal processing unit includes a main path signal adjusting unit, a branch path signal adjusting unit and a baseband processing unit which are connected in sequence;
the main path signal adjusting unit and the branch path signal adjusting unit respectively comprise an orthogonal demodulator and an A/D converter;
the orthogonal demodulator is used for demodulating the received primary feed source signal/branch radio frequency signal;
the A/D converter is used for converting the demodulated primary feed source signal/branch radio frequency signal into a digital signal;
the baseband processing unit calculates the received digital signals to obtain a main feed source amplitude signal and a plurality of branch radio frequency amplitude signals;
the main path signal adjusting unit and the branch path signal adjusting unit both further comprise a third filter, and the third filter carries out filtering processing on the main feed source signal/branch path radio frequency signal before demodulation;
the tracking signal processing unit also comprises a switching signal generator or/and an AGC control unit;
the switch signal generator is respectively connected with the multi-way switch and the baseband processing unit, and the baseband processing unit controls the switch signal generator to send a switch control signal and controls the multi-way switch to realize that a plurality of branch radio-frequency signals are selected in a time-sharing manner and enter the baseband processing unit in sequence;
and the AGC control unit is respectively connected with the quadrature demodulator and the baseband processing unit and is used for carrying out automatic gain control on the signals input into the baseband processing unit.
6. A method for tracking a low earth orbit mobile communication satellite, the method comprising at least the steps of:
step 1, resolving a main feed source signal to obtain a main feed source amplitude signal;
resolving a plurality of branch radio frequency signals in different directions around the main loudspeaker to obtain a plurality of branch radio frequency amplitude signals;
step 2, determining the deviation between the main feed source amplitude signal and the plurality of branch radio frequency amplitude signals, and determining a driving parameter according to the deviation;
and 3, driving the antenna to move according to the driving parameters.
7. The low-earth orbit mobile communication satellite tracking method according to claim 6, wherein the primary feed amplitude signal obtaining method comprises:
converting the primary feed source amplitude signal into a primary feed source L frequency band signal;
I/Q demodulation is carried out on the L frequency band signal of the main feed source, and the L frequency band signal of the main feed source is converted into a zero intermediate frequency I/Q signal of the main feed source;
converting the I/Q signal into I/Q data;
resolving the I/Q data to obtain main feed source signal power, namely the main feed source amplitude signal/branch radio frequency amplitude signal;
the tracking method further comprises the following steps: before the primary feed source signal is resolved, the primary feed source signal is divided into a communication signal and a beacon signal for resolving.
8. The low-earth-orbit mobile communication satellite tracking method according to claim 6, wherein the multiple branch rf amplitude signal obtaining method comprises:
controlling the branch radio-frequency signals to be converted into branch radio-frequency L frequency band signals in sequence in a time-sharing manner;
carrying out IQ demodulation on the branch radio frequency L frequency band signals in sequence, and converting the branch radio frequency L frequency band signals into a plurality of branch radio frequency I/Q signals with zero intermediate frequency;
sequentially converting the plurality of I/Q signals into a plurality of I/Q data;
and resolving the I/Q data to obtain the power of the branch radio-frequency signals, namely the branch radio-frequency amplitude signals.
9. The low-earth-orbit mobile communication satellite tracking method according to claim 7 or 8, wherein the solving method comprises:
performing AGC control on the I/Q data according to the power estimation value;
carrying out frequency estimation on the I/Q data to obtain a frequency estimation value;
guiding a phase-locked loop to lock a tracking signal by using the frequency estimation value;
after the phase-locked loop locks the tracking signal, adopting Q-path output to calculate the signal power:
wherein:
n is the total number of sampling points in one period;
S q the signal power of each point collected by the Q path.
10. The low-earth-orbit mobile communication satellite tracking method according to claim 9, wherein the phase-locked loop uses Q-path phase detection.
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