A kind of antenna servo feedback system and platform for integrated measurement, operation and control equipment

Abstract

The invention relates to an antenna servo feed tracking system of integrated measurement, operation and control equipment, comprising: a station control management unit, which loads an orbit program guide file into a program guide module and performs zero calibration on a distance; an antenna control unit, which drives an antenna through an antenna driving unit to complete position preset, and when a satellite enters a wave velocity range of the antenna, controls the antenna to perform program tracking, automatic phase calibration, automatic capture and automatic tracking on the satellite; an antenna driving unit, which controls the antenna to rotate according to a control signal; an S / X feed source, which is used to capture and track an S / X frequency band signal of a satellite, receive S / X frequency band digital transmission telemetry data, and transmit an S / X frequency band remote control instruction to the antenna; and a polarization control unit, which is used to switch a coaxial polarization switch for S / X frequency band tracking; and the invention realizes efficient management of measurement and control resources, improves the maintenance level of an antenna servo feed system, efficiently eliminates faults of the antenna servo feed system, and prolongs the service life of the antenna servo feed tracking system.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to an antenna servo feedback tracking system for integrated measurement, operation and control equipment. Background Art

[0002] In recent years, my country's commercial space launches have been in a state of continuous high-intensity launches. In order to complete these high-intensity space launch missions, the integrated measurement, operation and control equipment needs to be kept in a good and healthy state at all times to ensure that the mission can be successfully completed. As a key front-end device of the measurement and control equipment, the antenna servo feedback system is a typical mechatronics system, which is greatly affected by the external environment, has high wear and tear during operation, and has many technical parameters. Once a failure occurs, it will cause serious consequences.

[0003] Therefore, in order to effectively solve the urgent needs of frequent failures and difficult maintenance and management of the antenna, servo and feeder systems of integrated measurement, operation and control equipment, realize the efficient management of measurement and control resources, improve the maintenance level of the antenna, servo and feeder systems, efficiently eliminate failures of the antenna, servo and feeder systems, and extend the service life of the antenna, servo and feeder systems, a standard system of antenna, servo and feeder systems is needed. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the present application provides an antenna servo feed system for integrated measurement, operation and control equipment, which is used to achieve efficient management of measurement and control resources, improve the maintenance level of the antenna servo feed system, efficiently eliminate antenna servo feed system failures, and extend the service life of the antenna servo feed system.

[0005] To achieve the above purpose, the present application is implemented through the following technical solutions: an antenna servo feedback tracking system for integrated measurement, operation and control equipment, comprising:

[0006] Station control management unit, used to upload the orbit program guide file and load it into the program guide module, and calibrate the distance to zero;

[0007] The antenna control unit receives the information after the station control management unit completes the distance zeroing, drives the antenna through the antenna driving unit to complete the position preset, and when the satellite enters the antenna wave speed range, controls the antenna through the antenna driving unit to perform program tracking, automatic phase calibration, automatic capture and automatic tracking of the satellite;

[0008] An antenna driving unit controls the antenna to rotate according to a control signal sent by an antenna control unit;

[0009] S / X feed, used to capture and track the S / X band signals of satellites, receive S / X band digital telemetry data, and transmit S / X band remote control commands to the antenna;

[0010] Polarization control unit, used to switch the coaxial polarization switch for S / X band tracking; receive and execute polarization control commands in real time to report the current state of the polarization switch.

[0011] Preferably, the S / X feed is designed as an integrated S / X dual-band receiver and transmitter, and is used to capture and track satellite S / X band signals, receive S / X band digital telemetry data, and transmit S / X band remote control commands.

[0012] Preferably, the antenna control unit includes a communication module and a processing module;

[0013] The communication module is used to communicate with the station control management unit and the antenna, and receive the guidance data information sent by the station control management unit and the operation information of the antenna;

[0014] The processing module is used to perform difference processing on the guidance data information received from the station control management unit, and send the guidance data information after the difference processing to the antenna driving unit through the communication module, and the antenna driving unit drives the antenna to complete the position preset;

[0015] It is used to receive the operation information of the antenna and send the real-time operation information of the antenna to the station control management unit through the communication unit. When the station control management unit fails, the processing module controls the antenna to track the satellite in real time according to the orbit information previously sent by the station control management unit.

[0016] Preferably, the antenna control unit further includes:

[0017] Inspection module, used for automatic inspection of station control management unit;

[0018] The data storage module is used to store the operation information of the antenna during operation and the data detected by the inspection module.

[0019] Preferably, the antenna driving unit comprises:

[0020] The control module is used for the interlocking and action sequence of antenna protection, receives the control instructions of the antenna control unit, and sends the status of the detection point to the antenna control unit;

[0021] The driving module receives the instructions sent by the control module and drives the antenna according to the instructions sent by the control module. Specifically, it is composed of a driving power amplifier, a loop control and protection circuit, and an actuator motor, a speed sensor, and a current sensor installed on the antenna. It converts the error signal and amplifies the power, and finally drives the antenna to rotate and realize the movement of the antenna.

[0022] Preferably, the drive module is composed of dual motor drives, each motor has an independent current loop, and the two motors share a speed loop.

[0023] Preferably, the polarization control unit comprises:

[0024] Switching module, used to switch the coaxial polarization switch for S-band tracking, data and X-band tracking;

[0025] The communication module is used to communicate with the station control management unit and report the polarization control commands received and executed. It mainly completes the polarization control of the uplink signal so that the antenna outputs the rotation direction signal required by the satellite;

[0026] Preferably, the antenna control unit further comprises an angle encoding module, which is used to perform real-time synchronous encoding and transmit the encoded data to the processing unit, wherein the encoded data comprises the encoded data of the antenna azimuth, pitch and third axis angle.

[0027] Preferably, the angle encoding module is composed of a first microcontroller unit and a second microcontroller unit, wherein the first microcontroller unit is used for an external interrupt source for shaft angle encoding data management, and completes angle data collection, encoding and serial output in the interrupt service program; the second microcontroller unit is used to decode IRIG-B (DC) code time information, and to convert internal timing operation and external timing operation.

[0028] Preferably, it also includes a tracking receiver, which is used to track and demodulate the sum and difference signals of the satellite's beacon signal and broadband remote sensing signal coupled from the feed source, and send the azimuth and pitch error voltage and locking indication to the antenna control unit to complete self-tracking of the satellite.

[0029] The beneficial effects of the present invention are:

[0030] The present invention, through the provision of a station control management unit, an antenna control unit, an antenna driving unit, an S / X feed source and a polarization control unit, can complete program tracking, automatic phase calibration, automatic capture and automatic tracking of the antenna and simultaneously control and polarization control the antenna, thereby achieving efficient management of measurement and control resources, improving the maintenance level of the antenna servo feed system, efficiently eliminating faults in the antenna servo feed system and extending the service life of the antenna servo feed system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a structural block diagram of an antenna servo feedback system of an integrated measurement, operation and control device in an embodiment of the present invention;

[0033] Figure 2It is a connection block diagram of the antenna servo feedback system of the integrated measurement, operation and control equipment in an embodiment of the present invention;

[0034] Figure 3 is a structural block diagram of an antenna control unit in an embodiment of the present invention;

[0035] Figure 4 is a structural block diagram of an antenna driving unit in an embodiment of the present invention;

[0036] Figure 5 is a block diagram of the antenna control unit in an embodiment of the present invention;

[0037] Figure 6 It is a block diagram of the tracking receiver in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0043] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0045] In recent years, with the development of computer technology, communication technology and cloud technology, integrated measurement, operation and control technology and equipment have developed rapidly. In order to effectively solve the urgent needs of frequent failures and difficult maintenance and management of integrated measurement, operation and control equipment, and realize efficient management of measurement and control resources.

[0046] In order to solve the above technical problems, this embodiment discloses Figure 1 and Figure 2 The present invention provides an integrated measurement, operation and control equipment antenna servo feedback tracking system, comprising:

[0047] The station control management unit is used to load the uploaded orbit program guidance file into the program guidance module and calibrate the distance to zero; the station control management unit issues the mission plan through the network, and the mission plan includes the mission code, target code, AGC start control level, angular error start control voltage and mission point information, and at the same time processes the uploaded orbit program guidance file through the program guidance module to obtain guidance data information;

[0048] The antenna control unit is the control center of the entire system. It is composed of special function templates and computer general templates that meet national standards. It completes various controls of antenna movement and real-time calculation and implementation of various control strategies, and finally completes the precise tracking of the target by the antenna. It is a fully digital device that integrates control, measurement, monitoring, calculation, communication, recording and other functions.

[0049] like Figure 3 The antenna control unit includes a communication module, a processing module, an inspection module, a data storage module, an angle encoding module and a display module; specifically, the antenna control unit uses an industrial computer, and all the boards in the industrial computer are built in a 19-inch standard chassis, such as Figure 5The industrial computer shown uses CPCI bus, A / D acquisition card, D / A conversion card, RS422 / 485 serial communication card, single board computer, etc. are all installed on the bus, and the input and output functions are realized by KVM switch. The A / D acquisition card mainly performs analog-to-digital conversion on the broadband error voltage, narrowband error voltage and AGC voltage sent by the tracking receiver. The D / A conversion card mainly performs digital-to-analog conversion on the output speed command signal and polarization control signal, and the RS422 / 485 serial communication card mainly realizes the communication between PDU (time code unit), ADU and tracking receiver;

[0050] In specific implementation, the communication module realizes communication through RS422 / 485 serial communication card, and the processing module is connected with other modules through CPC1 bus;

[0051] The antenna control unit in one embodiment of the present application mainly performs the following tasks:

[0052] Complete the setting and switching of various working modes to realize the control of the antenna;

[0053] Complete centralized monitoring of the working status of each subsystem (including working mode, measurement system geodetic coordinates, polarization mode, communication interface, communication status, handwheel status data, working status of other equipment, etc.), automatic parameter setting and switching;

[0054] The inspection module completes automatic inspection of subsystems, fault alarm (sound), and display of fault locations; it immediately issues an alarm when a fault is found and reports it to the station control management unit;

[0055] Realize "local" control and "remote control" in an automated process:

[0056] The communication module completes the communication with the station control management unit;

[0057] The processing unit receives the status query information, instructions and working parameters sent by the station control management unit and interprets and executes them; it transmits the subsystem equipment inspection information, working status, parameters and antenna angle measurement data to the station reporting control management unit; when an unexpected failure occurs in the station reporting control management unit, the subsystem can independently and automatically complete the real-time tracking of the target according to the orbit parameters input in advance;

[0058] Complete the coordinate transformation and error correction from the antenna earth system to the measurement system;

[0059] The display unit is used to display the main screen content (permanent screen): Beijing time, working mode, polarization mode, antenna angle position, S / X band error voltage (DUA, DUE) and AGC level (UAGC), etc.;

[0060] It has safety protection function display, including the pre-limit, final limit, emergency stop, handwheel interlock, pitch door interlock, antenna storage lock and other status display functions of azimuth, pitch and third axis, and there is soft limit setting in the software;

[0061] During operation, the station control management unit loads the uploaded orbit program guide file into the program guide module and completes the distance zero calibration; the antenna control unit receives the information after the zero calibration, that is, the guide data information, and drives the antenna to complete the antenna position preset according to the guide data information. When the satellite enters the antenna wave speed range, the antenna driving unit controls the antenna to perform program tracking, automatic phase calibration, automatic capture and automatic tracking of the satellite;

[0062] like Figure 4 The antenna driving unit shown controls the antenna to rotate according to the control signal sent by the antenna control unit; specifically, the antenna driving unit includes:

[0063] The control module is used for the interlocking and action sequence of antenna protection, receives the control instructions of the antenna control unit, and sends the status of the detection point to the antenna control unit;

[0064] The driving module receives the instruction sent by the control module and drives the antenna to move according to the instruction sent by the control module;

[0065] In one embodiment of the present application, the antenna drive unit (ADU) is an actuator for realizing the control and driving of various functions of the antenna. When designing its drive, it includes load torque calculation, motor power calculation, power amplifier design, control and protection design, interface design, loop design, etc.

[0066] It should be noted that the antenna drive unit logically includes a control module, which uses a programmable logic controller (PLC). This component has the advantages of high integration, high reliability, and flexible logic control. The input of the programmable controller includes: antenna mechanical protection switch status, electrical protection status, and control commands. The output of the programmable controller includes: the connection and disconnection of the three-phase rectifier main power supply control, DC power supply control, brake power supply control, plug-in lock control, etc., and controls the operation and stop of the power amplifier.

[0067] Through PLC programming, the interlocking and action sequence of various antenna protections are realized. Through the RS485 serial interface between PLC and antenna control unit, the communication with antenna control unit is realized, the antenna control unit (ACU) instructions are received, and the status of antenna drive unit and antenna base detection point is reported.

[0068] It should be noted that the drive module is composed of dual motor drive, each motor has an independent current loop, and the two motors share a speed loop. In the specific implementation, the drive module adopts dual motor drive, electric backlash elimination, speed, torque (current) double closed loop speed control system, each motor constitutes an independent current loop, which is convenient for torque equalization and electric backlash elimination. The output signals of the two tachometers are summed as speed feedback information;

[0069] In one embodiment of the present application, a torque bias circuit is used to achieve electrical backlash elimination, improve the rigidity of the transmission chain, and reduce the impact of nonlinear factors of the transmission chain on system performance. The input signal of the bias circuit is taken from the current command, and the bias circuit is essentially a trapezoidal function generator.

[0070] In another embodiment of the present application, after the current negative feedback correction and the series compensation network compensation, the speed loop control object will be improved to a certain extent, which lays the foundation for the design of the speed loop. When designing the speed loop, the goal is to be fast, stable, and have a small overshoot;

[0071] In another embodiment of the present application, a complete motor speed controller is constructed by setting a current loop and a speed loop inside the power amplifier. Due to the use of dual motor drive, each motor forms an independent current loop, which is convenient for torque equalization and electrical backlash elimination. The speed difference between the two motors is used to suppress differential oscillation, and the output signals of the two tachometers are summed as speed feedback information. The two motors share a speed loop.

[0072] In the S / X feed, the S / X feed is used to capture and track the S / X band signals of the satellite, receive S / X band digital telemetry data, and transmit S / X band remote control commands to the antenna; and accept commands from the station control management unit or send confidences to the station control management unit.

[0073] In another embodiment of the present application, the S / X feed is designed with an integrated S / X dual-band reception and transmission, and is used to capture and track satellite S / X band signals, receive S / X band digital telemetry data, and transmit S / X band remote control commands; when the operation mode of the antenna control unit is the automatic operation mode or the automatic capture mode, the automatic tracking function when the satellite passes by can be realized; the S / X dual-band feed design mode can simultaneously realize the function of using the S / X feed to receive remote sensing data of commercial satellites, and the subsystem can use measurement and control signals and digital transmission signals to track satellites.

[0074] In one embodiment of the present application, the main reflector of the antenna is composed of 18 lobes, the sub-reflector is fixed by four supporting legs, the S feed completes the reception and radiation functions of the S-band signal, the X feed completes the reception and radiation functions of the X-band signal, and the two sets of feed sources are fixed together in a coaxial manner and installed on the center body of the antenna.

[0075] In one embodiment of the present application, the S-band feed is mainly composed of four cut-angle speakers, a polarization compensation section, a partition polarizer, a sum-difference network, a duplexer, etc. The four speakers S1, S2, S3, and S4 are arranged according to a fixed rule, with two arranged in the horizontal azimuth direction and two arranged in the vertical direction of pitch. The signals from the main and secondary reflectors enter the four speakers, and the sum signal can be obtained by summing the four speaker signals. The difference and resynthesis of the speaker receiving signals in the azimuth and pitch directions can obtain the difference signal.

[0076] It should be noted that the S-band synthesis network adopts the stripline form, and the broadband magic T and 3dB bridge are combined to output the sum and difference signals respectively. The S-band duplexer uses two bandpass filters with different center frequencies to mix and separate frequencies. The suppression of the transmission frequency is ≥90dB, and the suppression of the reception frequency is ≥35dB. The passband insertion loss is ≤0.5dB. The voltage standing wave ratio is ≤1.2∶1.

[0077] The X-band feed is mainly composed of an X-band corrugated horn, a tracker, a tracking network, a polarizer, an orthogonalizer, a duplexer, a polarization switch, etc. The downlink signal from the sub-reflector enters the corrugated horn, and the excited sum signal (TE11 mode) reaches the downlink channel along the horn, circular waveguide, polarizer, orthogonalizer, and duplexer. When the target deviates from the antenna electrical axis, the TE21 mode signal is coupled out in the eight square waveguides around the corrugated horn, and the four-way left-handed or right-handed coupled signals are subtracted from each other and then synthesized to form a difference signal, which is sent to the sum-difference phase-shifting synthesis network.

[0078] The X-band speaker adopts a small-angle corrugated speaker, which has the following advantages: low cross-polarization level, good standing wave characteristics, excellent radiation pattern and other performances; when the irradiation angle of the speaker to the edge of the sub-surface is 15, the edge irradiation level of the X-band is about -7dB.

[0079] It should be noted that the tracker is in the form of a TE21 mode tracker. Eight square waveguides with coupling holes are arranged at 45 degrees around the corrugated horn, so that two spatially orthogonal signals, left-handed and right-handed, can be coupled out. The TE21 mode coupler is a mode-selective coupler that selects a specific mode, and is composed of a circular waveguide as the main coupling line and a rectangular waveguide as the secondary coupling line.

[0080] The X-band uses a 90° dielectric plate phase shifter to achieve circular polarization. A low-loss dielectric plate is placed in a circular waveguide at 45° or 135°. When the electric field passes through the phase shifter at 45° or 135°, it is decomposed into two components, one parallel to the dielectric plate and the other perpendicular to the dielectric plate. After passing a certain distance, the phase difference between the two components is 90°, forming a circularly polarized wave.

[0081] The X-band duplexer is a device that realizes the sharing of X-band uplink and downlink signal waveguides. The duplexer adopts a waveguide duplexer. The suppression of the transmission frequency is ≥110dB, and the suppression of the reception frequency is ≥35dB. The passband insertion loss is ≤0.6dB. The voltage standing wave ratio is ≤1.2∶1.

[0082] In the polarization control unit, the polarization control unit includes a switching module and a communication module, which are mainly used to switch the coaxial polarization switch for S / X band tracking; receive and execute polarization control commands in real time to report the current state of the polarization switch.

[0083] In one embodiment of the present application, the switching module is mainly used for the local / remote control switching function to complete the coaxial polarization switch switching of S-band tracking, data and X-band tracking; the communication module is used to communicate with the station control management unit, receive and execute the polarization control commands issued by the station control management unit in real time, or report the current state of the polarization switch to the station control management unit.

[0084] It should be noted that the polarization control unit has two working modes: local control and remote control. In the local control mode, the polarization mode is switched by controlling the switch through the LCD touch screen. After it is in place, the status information is returned and sent to the LCD screen for display and reported to the antenna control unit. In the remote control mode, there is no LCD touch screen, and the switching of the polarization switch is controlled by the remote control command of the antenna control unit.

[0085] In one embodiment of the present application, a tracking receiver is also included for tracking and demodulating the satellite's beacon signal, broadband remote sensing signal and the sum and difference signals coupled from the feed source, and sending the azimuth and pitch error voltage and locking indication to the antenna control unit to complete self-tracking of the satellite.

[0086] It should be noted that the main function of the tracking receiver is to phase-lock and detect the beacon signal, convert it into a DC voltage signal, send it to the servo control system, and drive the antenna to point to the target in a way to find the maximum value of the signal.

[0087] like Figure 6 The tracking receiver shown is composed of a high-frequency channel part and a tracking receiver; the high-frequency channel part is composed of a phase-shift synthesis network, a tracking frequency converter and a receiving polarization switch; the tracking receiver is composed of a 2U industrial computer, a signal processing board, an intermediate frequency channel box and a level conversion board; the tracking receiver adopts a dual-channel design and can receive broadband signals and narrowband signals at the same time.

[0088] The remote sensing or telemetry signal from the differential path LNA is sent to the S phase-shift synthesis network or the X phase-shift synthesis network, and is first synthesized with the four-phase square wave modulation signal from the tracking receiver to achieve frequency conversion, and then synthesized with the signal from the sum LNA to send a signal to the tracking down-converter. The tracking down-converter converts the RF signal into an intermediate frequency signal with a frequency of 70MHz and sends it to the tracking receiver.

[0089] The 10MHz frequency reference signal of the time-frequency unit is sent to the baseband card. The clock circuit of the baseband card generates the clock signal required by the FPGA chip and the DSP chip to complete various functions based on the 10MHz frequency reference signal. The FPGA chip mainly realizes the capture and demodulation process of the sum and difference signals, and the DSP chip completes the communication with the host computer and the loading of the firmware program.

[0090] The tracking receiver uses correlation demodulation to extract the angle error voltage for narrowband signals such as standard signals and spread spectrum signals, uses correlation AGC circuit to perform gain control on the sum and difference signals, and achieves phase normalization of the sum and difference signals by capturing and tracking the sum signal. The core demodulation process includes carrier capture, code loop capture, signal tracking and other links.

[0091] In one embodiment of the present application, the tracking receiver has two working modes, one is a standard + digital transmission working mode, and the other is a non-coherent spread spectrum + digital transmission working mode;

[0092] It should be noted that in the standard + digital transmission working mode, the tracking receiver can simultaneously complete the reception and demodulation functions of the standard TT&C signal and the digital transmission signal. The standard TT&C signal uses the correlation demodulation method to extract the angle error voltage, and the digital transmission uses the envelope detection method to extract the angle error voltage.

[0093] In the non-coherent spread spectrum + digital transmission working mode, the tracking receiver can simultaneously complete the reception and demodulation functions of the spread spectrum signal and the digital transmission signal. The non-coherent spread spectrum signal adopts the correlation demodulation method to extract the angle error voltage, and the digital transmission adopts the envelope detection method to extract the angle error voltage.

[0094] In one embodiment of the present application, since the uplink of the system works in the S / X frequency band, and the downlink may work in S or X at the same time, in order to ensure that the transmitted uplink high power does not affect the reception of the downlink high-sensitivity signal, the mutual compatibility of the S and X frequency bands needs to be considered. This embodiment designs a transceiver isolation unit to ensure that the S and X dual-band transceivers of the system can work normally at the same time;

[0095] It should be noted that:

[0096] (1) Calculation of the S transmission power leakage to the S field amplifier input level; According to engineering experience, the antenna's receive-transmit isolation is 95dB, and the polarization isolation is 0dB. The maximum transmission power of the transmitter is 100W (50dBm), and the signal level of its transmission signal falling on the input end of the receiving field amplifier is 50-95=-45dBm. The net gain of LNA is 80dB~82dB. It is initially considered to add two stages of 40dB transmission impedance suppression in the middle of the field amplifier, located at different amplification positions inside the field amplifier. The output level of the transmission signal after the field amplifier is -45dBm~-42dBm, and the field amplifier output 1dB compression point P-1≥+13dBm. Therefore, when transmitting uplink in the S band, the front and rear stages of the S field amplifier work in a linear state, which does not affect the normal reception of the S band signal.

[0097] (2) The impact of the noise power of the S transmitter in the S receiving frequency band leaking to the S field amplifier input terminal on its noise temperature; Under normal circumstances, when the transmitter is working, its far-end noise spectrum will leak to the field amplifier input terminal, causing an increase in the noise temperature of the receiving system, and in severe cases, it will cause a decrease in the system G / T value. The general system design requires that when the transmitter is working, the noise spectrum density leaked from the transmitter to the receiving frequency band is 20dB less than the spectrum density of the receiving system, and the noise temperature deterioration caused by it is less than 1K.

[0098] The S-band transmitter power of this system is 100W. After being suppressed by the output filter, the power spectrum density of the signal output by the power amplifier in the S-band receiving band is ≤-193dBW / Hz. The suppression degree of the antenna S-band transmitting feeder on the S-band receiving band is ≥40dB, so the power spectrum density leaked to the receiving system is ≤

[0099] -233dBW / Hz, while the noise power spectral density of the S-band receiving system is: -206.09dBW / Hz. The power spectral density of the power amplifier leakage is 27dB lower than the system noise power spectral density, and its noise temperature contribution is less than 1K.

[0100] The receiving waveguide of the X-band is in a cutoff state for the transmitting power spectrum of the S-band, so the transmitting signal of the S-band will not leak to the receiving end of the X-band, and therefore the transmitting signal of the S-band will not affect the normal reception of the X-band signal.

[0101] (3) Analysis of the impact of the noise power transmitted by S in the X receiving frequency band to the input end of the X field amplifier on its noise temperature.

[0102] The S-band transmitter power of this system is 100W. After being suppressed by the stop filter and harmonic filter at the output end, the power spectrum density of the signal output by the power amplifier in the X-band receiving band is ≤-193dBW / Hz, and the suppression degree of the antenna S-band transmitting feeder on the X-band receiving band is ≥40dB. Therefore, the power spectrum density leaked to the receiving system is ≤-233dBW / Hz, and the noise power spectrum density of the X-band receiving system is -206.32dBW / Hz. The power spectrum density of the power amplifier leakage is 26.7dB lower than the system noise power spectrum density, and its noise temperature contribution is less than 1K.

[0103] (4) Calculation of X transmit power leakage to X field discharge input level.

[0104] According to engineering experience, the antenna's receive-transmit isolation is 95dB, and the polarization isolation is 0dB. The maximum transmit power of the transmitter is 100W (50dBm), and the signal level of its transmit signal falling on the input end of the receiver is 50-95=-45dBm. The net gain of LNA is 80dB~82dB. It is initially considered to add two stages of 40dB transmit impedance suppression in the middle of the field amplifier, located at different amplification positions inside the field amplifier. The output level of the transmit signal through the field amplifier is -45dBm~-43dBm, and the field amplifier output 1dB compression point P-1≥+13dBm. Therefore, when transmitting uplink in the X-band, the front and rear stages of the X field amplifier work in a linear state, which does not affect the normal reception of the X-band signal.

[0105] (5) The influence of the noise power of X transmitter in the X receiving frequency band leaking to the input end of X field amplifier on its noise temperature.

[0106] Normally, when the transmitter is working, the noise spectrum at the far end will leak to the input of the field amplifier, causing the noise temperature of the receiving system to increase, and in severe cases, causing the G / T value of the system to decrease. The general system design requires that when the transmitter is working, the noise spectrum density leaked from the transmitter to the receiving frequency band is 20dB less than the spectrum density of the receiving system, and the noise temperature deterioration caused by it is less than 1K.

[0107] The X-band transmitter power of this system is 100W. After being suppressed by the output stop filter, the power spectrum density of the signal output by the power amplifier in the X-band receiving band is ≤-193dBW / Hz. The suppression degree of the antenna X-band transmitting feeder on the X-band receiving band is ≥40dB. Therefore, the power spectrum density leaked to the receiving system is ≤-233dBW / Hz, and the noise power spectrum density of the X-band receiving system is: -206.32dBW / Hz. The power spectrum density of the power amplifier leakage is 26.7dB lower than the system noise power spectrum density, and its noise temperature contribution is less than 1K.

[0108] (6) Calculation of the X-transmit leakage to the S-field receiving level.

[0109] Because the antenna servo feed subsystem is a dual-frequency feed source, due to the high-order mode, if no measures are taken, the X-band transmission signal will leak to the S-band field amplifier receiving end, causing the field amplifier to be saturated and the S-band receiving system to not work properly. According to engineering experience, the antenna's receive-to-transmit isolation is 95dB, and the polarization isolation is 0dB. The maximum transmission power of the X transmitter is 100W (50dBm), and the signal level of its transmission signal falling to the S-band field amplifier input end of the receiver is 50-95=-45dBm. Assuming that the net gain of the S field amplifier in the X-band is still 80dB~82dB, it is initially considered to add two stages of 40dB transmission impedance suppression in the middle of the field amplifier, located at different amplification positions inside the field amplifier. The output level of the transmitted signal through the field amplifier is -45dBm~-43dBm, and the field amplifier output 1dB compression point P-1≥+13dBm. Therefore, when transmitting uplink in the X-band, the front and rear stages of the S field amplifier work in a linear state, which does not affect the normal reception of the S-band signal.

[0110] In one embodiment of the present application, the data storage module in the antenna control unit is used to archive the antenna angle measurement information and tracking parameter records. It should be noted that the parameter records include Beijing time, measurement system azimuth, elevation angle, third axis azimuth T; geodetic system azimuth A, elevation angle E; S / X band error voltage (DUA, DUE) and AGC level (UAGC), etc.;

[0111] In one embodiment of the present application, the processing module in the antenna control unit receives the task plan issued by the station control management unit through the network, and the content of the plan is the task code, target code, AGC start control level, angle error start control voltage and task point information. After receiving the guidance data information, interpolation processing is performed, and the antenna is guided to wait at the first point, that is, the preset point.

[0112] In one embodiment, the antenna control unit may also have a subsystem automatic testing function, and the test items include servo bandwidth, antenna motion range, maximum and minimum angular velocity, angular acceleration, etc.

[0113] It should be noted that the correction of the angle zero position is conveniently achieved through the position coding and timely code unit (PDU); the position coding and timely code unit (PDU) receives and demodulates the B code data and sends real-time angle data, time code and synchronization signal to the ACU.

[0114] The antenna control unit (ACU) has multiple working modes, the main working modes are azimuth and elevation axis working modes;

[0115] In the manual control mode, the azimuth, pitch and third axis motors are powered, the brakes are released, the ACU receives the position information from the joystick or manual input, and outputs the corresponding speed command to drive the antenna to rotate to a certain position;

[0116] In the digital guidance working mode, the azimuth, pitch and third axis motors are all powered, the brakes are released, and the ACU generates speed instructions to drive the antenna to rotate continuously based on the position sent by the measurement and control center;

[0117] In the automatic operation mode, ACU executes a series of functions such as transfer to waiting point, program tracking, fast phase calibration, automatic capture, self-tracking, etc. according to the given process;

[0118] In scanning mode, the azimuth, pitch and third axis motors are powered, the brakes are released, and the azimuth speed command and pitch speed command output by the ACU change at a certain slope at the same time or one of them changes separately to achieve the movement of the antenna electric axis in a certain airspace;

[0119] In the memory tracking mode, the azimuth, pitch and third axis motors are powered on, the brakes are released, and during the ACU self-tracking process, the tracking receiver suddenly loses lock. The ACU extrapolates the self-tracking orbit data before the lock is lost, calculates the orbit data for the next 5 seconds, and converts it into a speed command to drive the antenna to rotate;

[0120] In the program tracking working mode, the azimuth, pitch and third axis motors are powered on, the brakes are released, the ACU receives the theoretical orbit data, and calculates the corresponding azimuth speed command and pitch speed command according to the actual position of the antenna to drive the antenna to move;

[0121] It is especially noted that in the automatic tracking (azimuth and pitch tracking are set independently) working mode, the azimuth, pitch and third axis motors are all powered, the brakes are released, and the azimuth speed command and pitch speed command output by the ACU are calculated based on the error voltage sent by the tracking receiver;

[0122] The stowed working mode is actually a special designated working mode. When the antenna moves to the stowed position, it is automatically powered off and the azimuth and elevation are locked.

[0123] In remote control mode, ACU only accepts control from the station control management subsystem.

[0124] In another embodiment, the inspection module in the antenna control unit is used for automatic detection of the system, and completes automatic inspection and fault alarm of the system.

[0125] It should be noted that the fault detection content is refined, such as detecting the board: whether the A / D and D / A are opened normally and displaying the fault code, whether the data conversion status is normal; the encoding board detects whether the coarse and fine channels are normal, and whether the encoding data is valid; the time code board detects whether the input signal is valid;

[0126] Angle measurement data collection and processing, complete the collection, processing, real-time display, record storage, post-printing, etc. of measurement data, record and store angle measurement data of no less than 15 minutes. Realize real-time measurement of target A and E coordinates, and convert them into angle data with time stamp, and the time stamp is in whole seconds;

[0127] Complete the information display function, including antenna feed and subsystem status information, angle data, Beijing time, working mode, status detection and fault alarm information, etc.

[0128] In one embodiment of the present application, the angle coding module in the antenna control unit is used to perform real-time synchronous coding and transmit the coded data to the processing unit, and the coded data includes the coded data of the antenna azimuth, pitch and third axis angle.

[0129] It should be noted that the angle encoding module is composed of a first microcontroller unit and a second microcontroller unit. The first microcontroller unit is used for the external interrupt source of the axis angle encoding data management, and completes the collection, encoding and serial output of the angle data in the interrupt service program; the second microcontroller unit is used to decode the IRIG-B (DC) code time information, and to convert the internal time system work and the external time system work.

[0130] It should be noted that the PDU is an important component of the antenna control unit. It performs real-time synchronous encoding and transmits antenna azimuth, pitch, and third-axis angular encoding data serially at a rate of 100 Hz. It also has the function of a B-code time and frequency terminal: in the external time system working mode, it needs to demodulate the IRIG-B (DC) code signal to generate time information and various synchronization signals required by this subsystem that are strictly synchronized with the leading edge of the B-code reference code element; in the internal time system working mode, it generates the various synchronization signals required by this subsystem.

[0131] The dual MCU solution is adopted in the design of the shaft angle coding data, and the automatic conversion of the two working modes of the B code time and frequency terminal is realized. It automatically switches to the internal time system working mode when there is no external B code input, and automatically switches to the external time system working mode when there is external B code input, without manual intervention. The 100Hz synchronization signal is used as the external interrupt source of the shaft angle coding data management MCU, and the angle data collection, encoding and serial output are completed in the interrupt service program; the other MCU performs software decoding on the IRIG-B (DC) code time information to realize the automatic conversion function of the two working modes, and manages the serial communication (100Hz) and display control with external devices at the same time, while the extraction of the IRIG-B (DC) code second synchronization signal and the generation of each synchronization signal are completed by a CPLD. In addition, there is serial communication between the two MCUs to transmit information.

[0132] In one embodiment of the present application, the system also provides antenna azimuth soft limit, pre-limit switch, final limit switch, pitch soft limit, pre-limit switch, final limit switch, third-axis pre-limit switch, final limit switch; antenna azimuth zero-crossing switch, hatch opening detection switch, azimuth plug-in lock, pitch plug-in lock; azimuth brake, pitch brake, third-axis brake; three-phase power supply phase sequence detection, overcurrent detection, phase loss detection, and an emergency stop switch and an audible and visual alarm device.

[0133] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An antenna servo feedback system for integrated measurement, operation and control equipment, characterized in that: include: Station control management unit, used to upload the orbit program guide file and load it into the program guide module, and calibrate the distance to zero; The antenna control unit receives the information after the station control management unit completes the distance zeroing, drives the antenna through the antenna driving unit to complete the position preset, and when the satellite enters the antenna wave speed range, controls the antenna through the antenna driving unit to perform program tracking, automatic phase calibration, automatic capture and automatic tracking of the satellite; An antenna driving unit controls the antenna to rotate according to a control signal sent by an antenna control unit; S / X feed, used to capture and track the S / X band signals of satellites, receive S / X band digital telemetry data, and transmit S / X band remote control commands to the antenna; Polarization control unit, used to switch the coaxial polarization switch for S / X band tracking; receive and execute polarization control commands in real time to report the current state of the polarization switch; The S / X feed is designed with an integrated S / X dual-band receiving and transmitting function, and is used to capture and track satellite S / X band signals, receive S / X band digital telemetry data, and transmit S / X band remote control commands. The S-band feed source is mainly composed of four cut-angle horns, a polarization compensation section, a baffle polarizer, a sum-and-difference network, and a duplexer. Two horns are arranged in the horizontal azimuth direction, and two horns are arranged in the elevation vertical direction. The signals from the main and secondary reflection surfaces enter the four horns, and the sum signal can be obtained by summing the signals of the four horns. The difference and resynthesis of the received signals of the horns in the azimuth and elevation directions can be obtained.

2. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 1, characterized in that: The antenna control unit includes a communication module and a processing module; The communication module is used to communicate with the station control management unit and the antenna, and receive the guidance data information sent by the station control management unit and the operation information of the antenna; The processing module is used to perform difference processing on the guidance data information received from the station control management unit, and send the guidance data information after the difference processing to the antenna driving unit through the communication module, and the antenna driving unit drives the antenna to complete the position preset; It is used to receive the operation information of the antenna and send the real-time operation information of the antenna to the station control management unit through the communication unit. When the station control management unit fails, the processing module controls the antenna to track the satellite in real time according to the orbit information previously sent by the station control management unit.

3. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 2, characterized in that: The antenna control unit also includes: Inspection module, used for automatic inspection of station control management unit; The data storage module is used to store the operation information of the antenna during operation and the data detected by the inspection module.

4. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 1, characterized in that: The antenna driving unit comprises: The control module is used for the interlocking and action sequence of the antenna protection, receives the control instructions of the antenna control unit, and sends the status of the detection point to the antenna control unit; The driving module receives the instruction sent by the control module and drives the antenna to move according to the instruction sent by the control module.

5. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 4, characterized in that: The drive unit is composed of dual motor drives, each motor has an independent current loop, and the two motors share a speed loop.

6. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 1, characterized in that: The polarization control unit comprises: Switching module, used for coaxial polarization switching of S-band tracking, data and X-band tracking; The communication module is used to communicate with the station control management unit and report the received and executed polarization control commands.

7. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 1, characterized in that: The antenna control unit also includes an angle encoding module, which is used to perform real-time synchronous encoding and transmit the encoded data to the processing unit. The encoded data includes the encoded data of the antenna azimuth, pitch and third axis angle.

8. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 7, characterized in that: The angle encoding module consists of a first microcontroller unit and a second microcontroller unit. The first microcontroller unit is used for an external interrupt source for shaft angle encoding data management, and completes the collection, encoding and serial output of angle data in the interrupt service program; the second microcontroller unit is used to decode the IRIG-B code time information and to convert internal and external time system operations.

9. The antenna servo feedback system for integrated measurement, operation and control equipment according to claim 1, characterized in that: It also includes a tracking receiver, which is used to track and demodulate the satellite's beacon signal, the sum and difference signals of the broadband remote sensing signal coupled from the feed source, and send the azimuth and pitch error voltage and locking indication to the antenna control unit to complete the self-tracking of the satellite.

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