CN116366125A - S/C frequency band antenna foundation integrated measurement and control terminal - Google Patents
S/C frequency band antenna foundation integrated measurement and control terminal Download PDFInfo
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Abstract
The invention discloses an S/C frequency band antenna foundation integrated measurement and control terminal, which is used for automatically switching corresponding baseband processing programs through ground uplink matrix instructions or according to the judgment result of the power intensity of uplink signals received by a current radio frequency receiving channel, intelligently processing the uplink signals received by the radio frequency receiving channel of current equipment, demodulating remote control instructions and ranging sounds, modulating the remote measurement and ranging sounds according to the current working frequency band, and then sending the remote measurement and ranging sounds to corresponding radio frequency transmitting channels. The design method realizes the automatic/manual switching use of the S-band TDRSS space-based spread spectrum transponder function and the C-band unified carrier system TT & C foundation measurement and control function on the basis of a set of digital processing hardware platform, greatly improves the measurement and control capacity and measurement and control range of satellites, reduces the weight, volume and power consumption of similar products, has strong functionality, and can be widely applied to aircrafts with relay measurement and control requirements; the method can also be applied to an aircraft based on foundation measurement and control, and the relay function is used as a backup.
Description
Technical Field
The invention relates to an S/C frequency band antenna foundation integrated measurement and control terminal, and belongs to the technical field of satellite measurement and control.
Background
With the development of aerospace industry, the number of in-orbit satellites is increased year by year, which puts a high coverage requirement on a satellite measurement and control system. The current system mainly supporting measurement and control comprises: ground measurement and control systems (ground measurement and control systems, TT & C) and tracking and data relay systems (space-based measurement and control systems, TDRSS).
At present, a ground measurement and control system with C frequency band standard is formed in China. Meanwhile, the tracking and data relay system also greatly improves the transmission efficiency of the space information and improves the satellite measurement and control coverage area. Currently, second generation relay satellite systems have been put into use. In the future, a space-based measurement and control system mainly comprising a tracking and data relay system is a main direction of measurement and control development in China.
At present, due to the limitation of coverage angles of the ground measurement and control system, part of satellites can float out of a ground measurement and control range and touch a measurement and control blind area of a ground monitoring station in China. In order to timely master telemetry data of the whole satellite, the gesture of the whole satellite is controlled and monitored most timely, and a relay terminal is often used when the whole satellite is designed. The relay terminal firstly exchanges data with the space-chain satellite based on space-based measurement and control, and then exchanges data with a ground monitoring station in China, so that the aim of indirect communication between the ground and the whole satellite is fulfilled. And after the whole satellite enters the orbit determination operation stage, the responsibility of data exchange with the ground monitoring station is to be carried out by the measurement and control transponder. At this time, the relay terminal is generally used as a cold backup and is left for standby.
In order to adapt to different requirements of high orbit satellites for measurement and control in an orbit-changing stage and an orbit-fixing stage, the advantages of the aerospace measurement and control network are fully exerted, the measurement and control capability and coverage range of the satellites are improved, and meanwhile, the space layout, the quality and the power consumption of the satellites are reasonably optimized, so that an antenna-base integrated measurement and control terminal capable of working in an S frequency band and a C frequency band is focused. The S/C frequency band antenna foundation integrated measurement and control terminal can switch different baseband processing programs and working frequency bands according to the signal intensity of a receiving channel or ground instructions.
Disclosure of Invention
The technical solution of the invention is as follows: the S/C frequency band antenna foundation integrated measurement and control terminal overcomes the defects of the prior art, and is designed in such a way that an S frequency band radio frequency receiving and transmitting channel and a C frequency band radio frequency receiving and transmitting channel share a set of digital processing module, and different baseband processing programs are switched through automatic/manual instructions, so that the differential requirements of measurement and control on the whole satellite are realized.
The technical scheme of the invention is as follows:
the invention discloses an S/C frequency band antenna foundation integrated measurement and control terminal, which comprises an S frequency band radio frequency transceiver channel, a C frequency band radio frequency transceiver channel and a digital processing module; wherein,,
the S-band radio frequency receiving and transmitting channel down-converts an S-band radio frequency input signal into an S-band baseband signal and sends the S-band baseband signal to the digital processing module; up-converting the modulated S-band baseband signal sent by the digital processing module to an S-band radio frequency signal for output; transmitting the S frequency band analog AGC level to a digital processing module;
the C-band radio frequency receiving and transmitting channel down-converts the C-band radio frequency input signal into a C-band baseband signal and sends the C-band baseband signal to the digital processing module; up-converting the modulated C-band baseband signal sent by the digital processing module into a C-band radio frequency signal to be output, and providing the C-band radio frequency signal to a clock source for synchronizing the S-band radio frequency receiving and transmitting channel and the digital processing module; transmitting the C frequency band analog AGC level to a digital processing module;
the digital processing module is used for carrying out S-band remote control signal processing on the S-band baseband signals sent by the S-band radio frequency receiving and transmitting channel, tracking and demodulating the uplink signals, demodulating an S-band remote control instruction and an S-band ranging sound, and outputting the S-band remote control instruction and the S-band ranging sound outwards; c frequency band remote control signal processing is carried out on the C frequency band baseband signal sent by the C frequency band radio frequency receiving and transmitting channel, the uplink signal is tracked and demodulated, a C frequency band remote control instruction and a C frequency band ranging sound are demodulated, and the C frequency band remote control instruction and the C frequency band ranging sound are output outwards; processing the S-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated S-band baseband signal and sending the modulated S-band baseband signal to the S-band radio frequency receiving and sending channel; processing the C-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated C-band baseband signal and sending the modulated C-band baseband signal to the C-band radio frequency transceiver channel; and performing mode switching according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel.
In the integrated measurement and control terminal, the S-band radio frequency transceiver channel includes an S-band radio frequency receiving channel and an S-band radio frequency transmitting channel, where the S-band radio frequency receiving channel includes a low noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low pass filter and an AGC circuit, and outputs an S-band baseband signal after performing low noise amplification, mixing, amplification, attenuation adjustment, low pass filtering and AGC automatic gain control on the received S-band radio frequency signal; the S-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs an S-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the S-band radio frequency receiving channel outputs an S-band analog AGC level to the digital processing module.
Further, in the integrated measurement and control terminal, the C-band radio frequency transceiver channel includes a C-band radio frequency receiving channel, a C-band radio frequency transmitting channel and a clock source module; the C-band radio frequency receiving channel comprises a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low-pass filter and an AGC circuit, and outputs a C-band baseband signal after low-noise amplification, mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control are carried out on a received C-band radio frequency signal; c frequency band radio frequency receiving channel outputs C frequency band analog AGC level to digital processing module; the C-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs a C-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the clock source module comprises a 10MHz crystal oscillator and provides clock signals for the C-band radio frequency receiving and transmitting channel, the S-band radio frequency receiving and transmitting channel and the digital processing module.
Further, in the integrated measurement and control terminal, the digital processing module comprises an S-band antenna base signal processing module, a C-band foundation signal processing module, a baseband processing program refreshing module and a PROM; wherein PROM includes PROM1 and PROM2; the PROM1 is used for operating the C frequency band foundation signal processing module, and the PROM2 is used for operating the S frequency band space base signal processing module; the baseband processing program refreshing module receives an uplink instruction sent by the ground to carry out power-on and power-off processing on the PROM, or enables the PROM1 or PROM2 according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel to realize mode switching.
Further, in the integrated measurement and control terminal, the S-band antenna-based signal processing module performs S-band remote control signal processing on the received S-band baseband signal, tracks and demodulates the uplink signal, despreads the spreading system, and decodes the S-band remote control command and the S-band ranging audio; and forwarding or transcoding the S-band telemetry signal and the ranging voice sent by the upper computer to an S-band transmitting and receiving channel.
And the C-band antenna-based signal processing module is used for carrying out C-band remote control signal processing on the received C-band baseband signal, tracking and demodulating the uplink signal, carrying out unified carrier system demodulation, solving a C-band remote control instruction and a C-band ranging sound, and transparently forwarding or transcoding the C-band remote control signal and the ranging sound sent by the upper computer to the C-band transmitting and receiving channel.
Further, in the integrated measurement and control terminal, the baseband processing program refreshing module comprises a power comparison module and a matrix instruction module; the power comparison module receives an S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and a C-band analog AGC level of the C-band radio frequency receiving and transmitting channel, sends the S-band analog AGC level and the C-band analog AGC level to the comparator, generates a judgment state quantity, directly sends the judgment state quantity to an enabling end of the PROM1, and sends the judgment state quantity to an enabling end of the PROM2 simultaneously after reverse processing to enable the PROM1 or the PROM2, so that mode switching is realized; the matrix instruction module receives an uplink instruction sent by the ground, and performs power-on and power-off processing on the PROM storing the processing program by controlling the on-off of the relay.
Further, in the integrated measurement and control terminal, the C-band foundation signal processing module includes: the device comprises an analog-to-digital conversion ADC1, a C-band quadrature down-conversion module, a C-band low-pass filter module, a C-band CIC filter module, a C-band carrier frequency discrimination acquisition tracking module, a C-band remote control subcarrier demodulation module, a C-band ranging demodulation and forwarding module, a C-band telemetry signal processing module and a digital-to-analog conversion DAC1; wherein,,
the analog-to-digital conversion ADC1 carries out analog-to-digital conversion on a C-band baseband signal sent by a C-band radio frequency receiving channel to obtain a digital signal;
the C frequency band quadrature down-conversion module carries out quadrature down-conversion to form a baseband signal;
the C-band low-pass filtering module and the C-band CIC filtering module carry out low-pass filtering and CIC filtering on the baseband signals, the filtered baseband signals are sent to the C-band carrier frequency discrimination capturing and tracking module, feedback processing is carried out until the signals are stable, capturing and tracking are completed, and then the stable baseband signals are sent to the C-band remote control subcarrier demodulation module and the C-band ranging demodulation and forwarding module; meanwhile, the C-band telemetry signal processing module carries out PM modulation on a C-band telemetry signal PSK code and a ranging tone sent by the upper computer, and sends the C-band telemetry signal PSK code and the ranging tone to a C-band radio frequency emission channel; or PSK modulation is carried out on the PCM code stream of the C-band telemetry signal sent by the upper computer, PM modulation is carried out on the PCM code stream, digital-to-analog conversion is carried out through the digital-to-analog conversion DAC1, and then the PCM code stream is sent to the C-band radio frequency emission channel.
Further, in the integrated measurement and control terminal, the S-band space-based signal processing module includes: the system comprises an analog-to-digital conversion ADC2, an S frequency band anti-interference module, an S frequency band FFT module, an S frequency band capturing module, an S frequency band signal tracking module, an S frequency band remote control signal processing module, an S frequency band ranging signal processing module, an S frequency band telemetry data framing module and a digital-to-analog conversion DAC2; wherein,,
the analog-to-digital conversion ADC2 performs analog-to-digital conversion on the S-band baseband signal to obtain a digital signal, and sends the digital signal to the S-band anti-interference module;
the S-band anti-interference module performs FFT operation on the digital signals, and sends the FFT data to the S-band FFT module;
the S frequency band FFT module performs IFFT conversion on the FFT data to obtain an anti-interference digital baseband signal, and outputs the anti-interference digital baseband signal to the S frequency band capturing module;
the S frequency band capturing module captures the anti-interference digital baseband signal to obtain a capturing processing result, and sends the capturing processing result to the S frequency band signal tracking module;
the S frequency band signal tracking module performs frame synchronization on the capturing processing result, and solves a remote control signal and a ranging tone, and sends the remote control signal to the S frequency band remote control signal processing module; transmitting the ranging sound to an S-band ranging signal processing module;
the S frequency band remote control signal processing module outputs a remote control data stream and a corresponding remote control clock according to the remote control signal;
the S-band ranging signal processing module forwards ranging voice to the S-band telemetry data framing module;
and the S-band telemetry data framing module modulates the ranging voice and the S-band telemetry signal sent by the upper computer to generate a downlink baseband signal and outputs the modulated S-band baseband signal.
Further, in the integrated measurement and control terminal, the capturing process specifically includes:
generating a regenerated carrier wave, and performing down-conversion on the anti-interference digital baseband signal to finish carrier wave stripping;
performing related operation on the data group codes after carrier stripping, and then accumulating;
FFT is carried out on the accumulated data, and detection judgment is carried out on FFT operation results;
capturing according to the detection judgment result, and outputting a capturing processing result.
In the integrated measurement and control terminal, the capturing processing result includes a pseudo code phase of the spread spectrum signal, rough estimation of carrier Doppler frequency shift and capturing state.
The beneficial effects of the invention compared with the prior art are as follows:
(1) Compared with the conventional S-band space-based relay terminal and the C-band ground-based measurement and control transponder, the S/C-band space-based integrated measurement and control terminal provided by the invention has the capacity of the space-based integrated measurement and control terminal, saves half of the products, effectively reduces the weight, volume and power consumption expenditure of the satellite platform on the premise of realizing the same functions, and is an integrated, miniaturized and integrated design with obvious advantages.
(2) According to the S/C frequency band antenna foundation integrated measurement and control terminal, a manual/automatic processing dual-mode design scheme is adopted for the baseband processing program refreshing module, active switching between the S frequency band antenna foundation signal processing module and the C frequency band foundation signal processing module can be achieved, and the S frequency band antenna foundation signal processing module and the C frequency band foundation signal processing module can be manually set and used according to satellite user requirements and actual requirements.
(3) The invention can adapt to different types of telemetry data types (PSK modulated telemetry data/telemetry PCM code data) sent to the S/C frequency band antenna foundation integrated measurement and control terminal by the upper computer, and can switch different working modes according to the instruction to perform different treatments on the telemetry data sent by the upper computer.
(4) The S/C frequency band space foundation integrated measurement and control terminal has the characteristics of strong function and performance expansibility, and can realize space foundation measurement and control and foundation measurement and control on the same set of hardware platform; in addition, the signal processing module in the digital processing module can be changed according to different requirements while the hardware design is kept unchanged, so that the unified carrier system measurement and control of the S frequency band can be realized. The problem of mass production and batch emission of satellites with multi-band measurement and control requirements can be solved.
(5) According to the S/C frequency band antenna foundation integrated measurement and control terminal, the frequency precision of the S frequency band transmitting/receiving local oscillator and the frequency precision of the C frequency band transmitting/receiving local oscillator are controlled to be 1kHz, the frequency precision is high, and aiming at the situation that frequency resources are increasingly tense, the S/C frequency band antenna foundation integrated measurement and control terminal can adapt to different frequency point requirements under the condition that circuit design is unchanged, effectively solves the situation of frequency resource conflict, and reduces the problem of frequency resource coordination.
(6) According to the S/C frequency band antenna foundation integrated measurement and control terminal, the S frequency band signal and the C frequency band signal of the downlink output signal can be output simultaneously, and one path of signal can be selected to be output independently according to the requirement. The adaptive selection of the matched uplink signals can realize the selection of a plurality of working modes under one set of products, and the product has good adaptability and strong practicability.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a functional block diagram of a C-band radio frequency transceiver module according to the present invention;
fig. 3 is a functional block diagram of an S-band radio frequency transceiver module according to the present invention;
FIG. 4 is a functional block diagram of a C-band foundation signal processing module according to the present invention;
FIG. 5 is a functional block diagram of the S-band space-based signal processing module according to the present invention;
fig. 6 is a functional block diagram of a baseband processing program refreshing module according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings and detailed description.
As shown in FIG. 1, the invention discloses an S/C frequency band antenna foundation integrated measurement and control terminal, which comprises an S frequency band radio frequency transceiver channel, a C frequency band radio frequency transceiver channel and a digital processing module; wherein,,
the S-band radio frequency receiving and transmitting channel down-converts an S-band radio frequency input signal into an S-band baseband signal and sends the S-band baseband signal to the digital processing module; up-converting the modulated S-band baseband signal sent by the digital processing module to an S-band radio frequency signal for output; transmitting the S frequency band analog AGC level to a digital processing module;
the C-band radio frequency receiving and transmitting channel down-converts the C-band radio frequency input signal into a C-band baseband signal and sends the C-band baseband signal to the digital processing module; up-converting the modulated C-band baseband signal sent by the digital processing module into a C-band radio frequency signal to be output, and providing the C-band radio frequency signal to a clock source for synchronizing the S-band radio frequency receiving and transmitting channel and the digital processing module; transmitting the C frequency band analog AGC level to a digital processing module;
the digital processing module is used for carrying out S-band remote control signal processing on the S-band baseband signals sent by the S-band radio frequency receiving and transmitting channel, tracking and demodulating the uplink signals, demodulating an S-band remote control instruction and an S-band ranging sound, and outputting the S-band remote control instruction and the S-band ranging sound outwards; c frequency band remote control signal processing is carried out on the C frequency band baseband signal sent by the C frequency band radio frequency receiving and transmitting channel, the uplink signal is tracked and demodulated, a C frequency band remote control instruction and a C frequency band ranging sound are demodulated, and the C frequency band remote control instruction and the C frequency band ranging sound are output outwards; processing the S-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated S-band baseband signal and sending the modulated S-band baseband signal to the S-band radio frequency receiving and sending channel; processing the C-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated C-band baseband signal and sending the modulated C-band baseband signal to the C-band radio frequency transceiver channel; and performing mode switching according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel.
As shown in fig. 2, the S-band radio frequency transceiver channel includes an S-band radio frequency receiving channel and an S-band radio frequency transmitting channel, where the S-band radio frequency receiving channel includes a low noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low pass filter and an AGC circuit, and outputs an S-band baseband signal after performing low noise amplification, mixing, amplification, attenuation adjustment, low pass filtering and AGC automatic gain control on a received S-band radio frequency signal; the S-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs an S-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the S-band radio frequency receiving channel outputs an S-band analog AGC level to the digital processing module.
As shown in fig. 3, the C-band radio frequency transceiver channel includes a C-band radio frequency receiving channel, a C-band radio frequency transmitting channel, and a clock source module; the C-band radio frequency receiving channel comprises a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low-pass filter and an AGC circuit, and outputs a C-band baseband signal after low-noise amplification, mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control are carried out on a received C-band radio frequency signal; c frequency band radio frequency receiving channel outputs C frequency band analog AGC level to digital processing module; the C-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs a C-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the clock source module comprises a 10MHz crystal oscillator and provides clock signals for the C-band radio frequency receiving and transmitting channel, the S-band radio frequency receiving and transmitting channel and the digital processing module.
As shown in fig. 1, the digital processing module comprises an S-band antenna base signal processing module, a C-band base signal processing module, a baseband processing program refreshing module and a PROM; wherein PROM includes PROM1 and PROM2; the PROM1 is used for loading the C frequency band foundation signal processing module, and the PROM2 is used for loading the S frequency band antenna base signal processing module; the baseband processing program refreshing module receives an uplink instruction sent by the ground to enable the PROM to be on-off processed, or enables the PROM1 and the PROM2 according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel, so that mode switching is realized.
The S frequency band space-based signal processing module is used for carrying out S frequency band remote control signal processing on the received S frequency band baseband signal, tracking and demodulating an uplink signal, and carrying out despreading processing on a spread spectrum system to obtain an S frequency band remote control instruction and an S frequency band ranging sound; and forwarding or transcoding the S-band telemetry signal and the ranging voice sent by the upper computer to an S-band transmitting and receiving channel.
And the C-band antenna-based signal processing module is used for carrying out C-band remote control signal processing on the received C-band baseband signal, tracking and demodulating the uplink signal, carrying out unified carrier system demodulation, solving a C-band remote control instruction and a C-band ranging sound, and transparently forwarding or transcoding the C-band remote control signal and the ranging sound sent by the upper computer to the C-band transmitting and receiving channel.
The baseband processing program refreshing module comprises a power comparison module and a matrix instruction module; the power comparison module receives an S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and a C-band analog AGC level of the C-band radio frequency receiving and transmitting channel, sends the S-band analog AGC level and the C-band analog AGC level to the comparator, generates a judgment state quantity, directly sends the judgment state quantity to an enabling end of the PROM1, and sends the judgment state quantity to an enabling end of the PROM2 at the same time after reverse processing, so that the PROM1 or the PROM2 is enabled, and mode switching is realized; the matrix instruction module receives an uplink instruction sent by the ground, and performs power-on and power-off processing on the PROM storing the processing program by controlling the on-off of the relay.
As shown in fig. 4, the C-band foundation signal processing module includes: the device comprises an analog-to-digital conversion ADC1, a C-band quadrature down-conversion module, a C-band low-pass filter module, a C-band CIC filter module, a C-band carrier frequency discrimination acquisition tracking module, a C-band remote control subcarrier demodulation module, a C-band ranging demodulation and forwarding module, a C-band telemetry signal processing module and a digital-to-analog conversion DAC1; the analog-to-digital conversion ADC1 performs analog-to-digital conversion on a C-band baseband signal sent by the C-band radio frequency receiving channel to obtain a digital signal; the C frequency band quadrature down-conversion module carries out quadrature down-conversion to form a baseband signal; the C-band low-pass filtering module and the C-band CIC filtering module carry out low-pass filtering and CIC filtering on the baseband signals, the filtered baseband signals are sent to the C-band carrier frequency discrimination capturing and tracking module, feedback processing is carried out until the signals are stable, capturing and tracking are completed, and then the stable baseband signals are sent to the C-band remote control subcarrier demodulation module and the C-band ranging demodulation and forwarding module; meanwhile, the C-band telemetry signal processing module carries out PM modulation on a C-band telemetry signal PSK code and a ranging tone sent by the upper computer, and sends the C-band telemetry signal PSK code and the ranging tone to a C-band radio frequency emission channel; or PSK modulation is carried out on the PCM code stream of the C-band telemetry signal sent by the upper computer, PM modulation is carried out on the PCM code stream, digital-to-analog conversion is carried out through the digital-to-analog conversion DAC1, and then the PCM code stream is sent to the C-band radio frequency emission channel.
As shown in fig. 5, the S-band space-based signal processing module includes: the system comprises an analog-to-digital conversion ADC2, an S frequency band anti-interference module, an S frequency band FFT module, an S frequency band capturing module, an S frequency band signal tracking module, an S frequency band remote control signal processing module, an S frequency band ranging signal processing module, an S frequency band telemetry data framing module and a digital-to-analog conversion DAC2; the analog-to-digital conversion ADC2 performs analog-to-digital conversion on the S-band baseband signal to obtain a digital signal, and sends the digital signal to the S-band anti-interference module; the S-band anti-interference module performs FFT operation on the digital signals, and sends the FFT data to the S-band FFT module; the S frequency band FFT module performs IFFT conversion on the FFT data to obtain an anti-interference digital baseband signal, and outputs the anti-interference digital baseband signal to the S frequency band capturing module; the S frequency band capturing module captures the anti-interference digital baseband signal to obtain a capturing processing result, and sends the capturing processing result to the S frequency band signal tracking module; the S frequency band signal tracking module performs frame synchronization on the capturing processing result, and solves a remote control signal and a ranging tone, and sends the remote control signal to the S frequency band remote control signal processing module; transmitting the ranging sound to an S-band ranging signal processing module; the S-band remote control signal processing module outputs a remote control data stream and a corresponding remote control clock according to the remote control signal; the S-band ranging signal processing module forwards ranging voice to the S-band telemetry data framing module; and the S-band telemetry data framing module modulates the ranging voice and the S-band telemetry signal sent by the upper computer to generate a downlink baseband signal and outputs the modulated S-band baseband signal.
The S frequency band capturing module captures the digital baseband signal after interference resistance to obtain capturing processing results, which are specifically as follows:
step S91, generating a regenerated carrier wave, and performing down-conversion on the anti-interference digital baseband signal to finish carrier wave stripping;
step S92, performing code correlation operation on the data group after carrier stripping, and then accumulating;
step S93, FFT is carried out on the accumulated data, and detection judgment is carried out on FFT operation results;
step S94, capturing according to the detection judgment result, and outputting a capturing processing result.
The acquisition processing results include the pseudo code phase of the spread spectrum signal, a rough estimate of the carrier doppler shift, and the acquisition state.
Examples
The embodiment provides a design method of an antenna-base integrated measurement and control terminal of an S frequency band and a C frequency band, which comprises an S frequency band radio frequency receiving and transmitting channel, a C frequency band radio frequency receiving and transmitting channel and a digital processing module.
The S frequency band radio frequency receiving channel consists of an S frequency band receiving channel and an S frequency band transmitting channel, and as shown in figure 1, the S frequency band radio frequency receiving channel comprises a low noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low pass filter, an AGC circuit and the like; wherein,,
the S-band radio frequency receiving channel receives an S-band radio frequency signal input by the front end, and the signal is amplified by the low-noise amplifier and the amplifier and then subjected to down-conversion processing. Then the signals sequentially enter an attenuator and an amplifier for signal matching, then enter a filter and the amplifier for filtering, finally enter an AGC (automatic gain control) circuit for amplification processing, and output baseband signals to a digital processing unit;
the S frequency band radio frequency transmitting module receives the modulated baseband signal from the digital processing unit, mixes the modulated baseband signal with a local oscillation signal generated by PLS (phase locked source) to a first baseband signal, and then carries out low-pass filtering and sends the first baseband signal to the amplifier; the amplified first baseband signal and the two local oscillators are mixed to obtain an S-band radio frequency signal, the S-band radio frequency signal is subjected to multistage amplification after passing through a band-pass filter, the amplified S-band radio frequency signal is subjected to power divider and then is output into two paths of signals, one path of signal is output as a power telemetry signal through a detector, and the other path of signal is output as a downlink S-band signal.
The C frequency band radio frequency receiving channel consists of a C frequency band receiving channel, a C frequency band transmitting channel and a clock source module, and as shown in figure 3, the C frequency band radio frequency receiving channel comprises a low noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low pass filter, an AGC circuit and the like; wherein,,
the C-band radio frequency receiving channel receives a C-band radio frequency signal input by the front end, and the signal is amplified by the low-noise amplifier and the amplifier and then subjected to down-conversion treatment. Then the signals sequentially enter an attenuator and an amplifier for signal matching, then enter a filter and the amplifier for filtering, finally enter an AGC (automatic gain control) circuit for amplification processing, and output baseband signals to a digital processing unit;
the C frequency band radio frequency transmitting module receives the modulated baseband signal from the digital processing unit, mixes the modulated baseband signal with a local oscillation signal generated by PLS (phase locked source) to a first baseband signal, and then carries out low-pass filtering and sends the first baseband signal to the amplifier; the amplified first baseband signal and the two local oscillators are mixed to obtain a C-band radio frequency signal, the C-band radio frequency signal is subjected to multistage amplification after passing through a band-pass filter, the amplified C-band radio frequency signal is subjected to power divider and then is output into two paths of signals, one path of signal is output as a power telemetry signal through a detector, and the other path of signal is output as a downlink C-band signal. Meanwhile, the stable 10MHz clock source can be provided for the S-band radio frequency receiving and transmitting channel.
The digital processing module comprises a C-band foundation signal processing module, an S-band space-based signal processing module and a baseband processing program refreshing module;
the C-band baseband signal processing module is shown in fig. 4, and includes: ADC1 (digital-to-analog conversion), DAC1 (analog-to-digital conversion), C frequency band quadrature down-conversion module, C frequency band low-pass filter module, C frequency band CIC filter module, C frequency band carrier frequency discrimination capture tracking module, C frequency band remote control subcarrier demodulation module, C frequency band ranging demodulation and forwarding module and C frequency band telemetry signal processing unit;
when processing the C frequency band foundation unified carrier body uplink signal, the C frequency band orthogonal down-conversion module carries out orthogonal down-conversion on the digital signal sent by the ADC1 to form a baseband signal, then carries out low-pass filtering and CIC filtering, sends the signal to the frequency discrimination module, carries out feedback processing until the signal is stable, completes capturing and tracking, and sends the baseband signal obtained after the low-pass filtering to the remote control subcarrier demodulation module and the ranging tone demodulation forwarding module; meanwhile, the remote measurement PSK signal (in PSK mode) sent by the upper computer is directly PM modulated together with the ranging sound and sent to the DAC1; or the remote measurement PCM code (in the PCM mode) sent by the upper computer is PSK modulated, PM modulated and sent to DAC1 (analog-to-digital conversion).
The S-band baseband signal processing module, as shown in fig. 5, includes: ADC2, DAC2, S frequency channel anti-interference module, S frequency channel FFT module, S frequency channel acquisition module, S frequency channel signal tracking module, S frequency channel remote control signal processing module, S frequency channel ranging signal processing module and S frequency channel telemetry data framing module.
When processing an uplink signal of an S-band space-based spread spectrum system, the S-band anti-interference module carries out FFT operation on a sampling data frame of the ADC2 which is currently input, and sends the judged data to the S-band FFT module for IFFT conversion to obtain anti-interference data, and the anti-interference data is output to the S-band capturing module. The S frequency band capturing module receives the anti-interference digital baseband signal, generates a regenerated carrier wave to carry out down-conversion on the digital baseband signal, and completes carrier wave stripping. Performing related operation on the data group codes after carrier stripping, and then accumulating; FFT is carried out on the accumulated data, and detection judgment is carried out on FFT operation results; in order to obtain a more accurate carrier value when the acquisition is completed, the S-band carrier tracking module is also required to continuously update the carrier frequency point. The pseudo code phase of the spread spectrum signal is then output to the S-band signal tracking module along with a rough estimate of the carrier Doppler shift and the acquisition state. After pseudo code phase and carrier frequency point tracking and locking, the S frequency band signal tracking module completes frame synchronization according to remote control data. Then sending the remote control signal into an S-band remote control signal processing module, solving a remote control data stream and a corresponding remote control clock, and outputting the remote control data stream and the corresponding remote control clock to the subsequent-stage equipment; meanwhile, the S-band telemetry data framing module modulates the ranging signal and the telemetry signal to generate a downlink baseband signal, outputs the modulated baseband signal through the DAC2, and sends the modulated baseband signal to the S-band radio frequency transmitting module.
The baseband processing program refreshing module, as shown in fig. 6, includes: a power comparison module and a matrix instruction module.
The base band processing program refreshing module software program operated by the FPGA in the digital processing module has two loading modes, and the first mode is to load the corresponding program through the output value of the power comparison circuit. Firstly, a power supply controlled switch is required to be switched to output a comparator circuit, a power comparison circuit receives an AGC value of an S frequency band receiving channel and an AGC value of a C frequency band receiving channel simultaneously, and performs size comparison, and outputs 0 or 1 to an enabling end of a PROM, and an inverter is designed before the enabling end of the PROM2 is input, so that only one of the PROM1 and the PROM2 is enabled to be effective; the second is to send matrix instructions to the ground to conduct the actuation state of the relay at the front end of the corresponding PROM power supply circuit, at this time, the enabling end needs to be manually switched to a normally high signal, and then the on-off of the relay is controlled by the ground matrix instructions to supply power to the PROM, so that the corresponding program in the PROM is selectively controlled and loaded.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (10)
1. The S/C frequency band antenna foundation integrated measurement and control terminal is characterized by comprising an S frequency band radio frequency transceiver channel, a C frequency band radio frequency transceiver channel and a digital processing module; wherein,,
the S-band radio frequency receiving and transmitting channel down-converts an S-band radio frequency input signal into an S-band baseband signal and sends the S-band baseband signal to the digital processing module; up-converting the modulated S-band baseband signal sent by the digital processing module to an S-band radio frequency signal for output; transmitting the S frequency band analog AGC level to a digital processing module;
the C-band radio frequency receiving and transmitting channel down-converts the C-band radio frequency input signal into a C-band baseband signal and sends the C-band baseband signal to the digital processing module; up-converting the modulated C-band baseband signal sent by the digital processing module into a C-band radio frequency signal to be output, and providing the C-band radio frequency signal to a clock source for synchronizing the S-band radio frequency receiving and transmitting channel and the digital processing module; transmitting the C frequency band analog AGC level to a digital processing module;
the digital processing module is used for carrying out S-band remote control signal processing on the S-band baseband signals sent by the S-band radio frequency receiving and transmitting channel, tracking and demodulating the uplink signals, demodulating an S-band remote control instruction and an S-band ranging sound, and outputting the S-band remote control instruction and the S-band ranging sound outwards; c frequency band remote control signal processing is carried out on the C frequency band baseband signal sent by the C frequency band radio frequency receiving and transmitting channel, the uplink signal is tracked and demodulated, a C frequency band remote control instruction and a C frequency band ranging sound are demodulated, and the C frequency band remote control instruction and the C frequency band ranging sound are output outwards; processing the S-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated S-band baseband signal and sending the modulated S-band baseband signal to the S-band radio frequency receiving and sending channel; processing the C-band telemetry signal and the ranging sound sent by the upper computer to generate a modulated C-band baseband signal and sending the modulated C-band baseband signal to the C-band radio frequency transceiver channel; and performing mode switching according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel.
2. The S/C band antenna base integrated measurement and control terminal according to claim 1, wherein: the S frequency band radio frequency receiving and transmitting channel comprises an S frequency band radio frequency receiving channel and an S frequency band radio frequency transmitting channel, wherein the S frequency band radio frequency receiving channel comprises a low noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low pass filter and an AGC circuit, and the S frequency band radio frequency receiving channel outputs an S frequency band baseband signal after low noise amplification, mixing, amplification, attenuation adjustment, low pass filtering and AGC automatic gain control are carried out on a received S frequency band radio frequency signal; the S-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs an S-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the S-band radio frequency receiving channel outputs an S-band analog AGC level to the digital processing module.
3. The S/C band antenna base integrated measurement and control terminal according to claim 1, wherein: the C-band radio frequency receiving and transmitting channel comprises a C-band radio frequency receiving channel, a C-band radio frequency transmitting channel and a clock source module; the C-band radio frequency receiving channel comprises a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low-pass filter and an AGC circuit, and outputs a C-band baseband signal after low-noise amplification, mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control are carried out on a received C-band radio frequency signal; c frequency band radio frequency receiving channel outputs C frequency band analog AGC level to digital processing module; the C-band radio frequency emission channel comprises a mixer, a filter, an amplifier, a power divider and a detector, and outputs a C-band radio frequency signal after the received baseband signal is subjected to mixing, filtering, amplifying, power division and detection; the clock source module comprises a 10MHz crystal oscillator and provides clock signals for the C-band radio frequency receiving and transmitting channel, the S-band radio frequency receiving and transmitting channel and the digital processing module.
4. The S/C band antenna base integrated measurement and control terminal according to claim 1, wherein: the digital processing module comprises an S-band space-based signal processing module, a C-band foundation signal processing module, a baseband processing program refreshing module and a PROM; wherein PROM includes PROM1 and PROM2; the PROM1 is used for operating the C frequency band foundation signal processing module, and the PROM2 is used for operating the S frequency band space base signal processing module; the baseband processing program refreshing module receives an uplink instruction sent by the ground to carry out power-on and power-off processing on the PROM, or enables the PROM1 or PROM2 according to the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel to realize mode switching.
5. The S/C band antenna base integrated measurement and control terminal according to claim 4, wherein: the S frequency band space-based signal processing module is used for carrying out S frequency band remote control signal processing on the received S frequency band baseband signal, tracking and demodulating an uplink signal, and despreading the uplink signal by a spread spectrum system to obtain an S frequency band remote control instruction and an S frequency band ranging sound; and forwarding or transcoding the S-band telemetry signal and the ranging voice sent by the upper computer to an S-band transmitting and receiving channel.
And the C-band antenna-based signal processing module is used for carrying out C-band remote control signal processing on the received C-band baseband signal, tracking and demodulating the uplink signal, carrying out unified carrier system demodulation, solving a C-band remote control instruction and a C-band ranging sound, and transparently forwarding or transcoding the C-band remote control signal and the ranging sound sent by the upper computer to the C-band transmitting and receiving channel.
6. The S/C band antenna base integrated measurement and control terminal according to claim 4, wherein: the baseband processing program refreshing module comprises a power comparison module and a matrix instruction module; wherein,,
the power comparison module receives the S-band analog AGC level of the S-band radio frequency receiving and transmitting channel and the C-band analog AGC level of the C-band radio frequency receiving and transmitting channel, sends the S-band analog AGC level and the C-band analog AGC level to the comparator, generates a judgment state quantity, then directly sends the judgment state quantity to the enabling end of the PROM1, and sends the judgment state quantity to the enabling end of the PROM2 simultaneously after the reverse phase treatment to enable the PROM1 or the PROM2, so that mode switching is realized;
the matrix instruction module receives an uplink instruction sent by the ground, and performs power-on and power-off processing on the PROM storing the processing program by controlling the on-off of the relay.
7. The S/C band antenna base integrated measurement and control terminal according to claim 3 or 4, wherein: the C frequency band foundation signal processing module comprises: the device comprises an analog-to-digital conversion ADC1, a C-band quadrature down-conversion module, a C-band low-pass filter module, a C-band CIC filter module, a C-band carrier frequency discrimination acquisition tracking module, a C-band remote control subcarrier demodulation module, a C-band ranging demodulation and forwarding module, a C-band telemetry signal processing module and a digital-to-analog conversion DAC1; wherein,,
the analog-to-digital conversion ADC1 carries out analog-to-digital conversion on a C-band baseband signal sent by a C-band radio frequency receiving channel to obtain a digital signal;
the C frequency band quadrature down-conversion module carries out quadrature down-conversion to form a baseband signal;
the C-band low-pass filtering module and the C-band CIC filtering module carry out low-pass filtering and CIC filtering on the baseband signals, the filtered baseband signals are sent to the C-band carrier frequency discrimination capturing and tracking module, feedback processing is carried out until the signals are stable, capturing and tracking are completed, and then the stable baseband signals are sent to the C-band remote control subcarrier demodulation module and the C-band ranging demodulation and forwarding module; meanwhile, the C-band telemetry signal processing module carries out PM modulation on a C-band telemetry signal PSK code and a ranging tone sent by the upper computer, and sends the C-band telemetry signal PSK code and the ranging tone to a C-band radio frequency emission channel; or PSK modulation is carried out on the PCM code stream of the C-band telemetry signal sent by the upper computer, PM modulation is carried out on the PCM code stream, digital-to-analog conversion is carried out through the digital-to-analog conversion DAC1, and then the PCM code stream is sent to the C-band radio frequency emission channel.
8. The S/C band antenna base integrated measurement and control terminal according to claim 4, wherein: the S frequency band space-based signal processing module comprises: the system comprises an analog-to-digital conversion ADC2, an S frequency band anti-interference module, an S frequency band FFT module, an S frequency band capturing module, an S frequency band signal tracking module, an S frequency band remote control signal processing module, an S frequency band ranging signal processing module, an S frequency band telemetry data framing module and a digital-to-analog conversion DAC2; wherein,,
the analog-to-digital conversion ADC2 performs analog-to-digital conversion on the S-band baseband signal to obtain a digital signal, and sends the digital signal to the S-band anti-interference module;
the S-band anti-interference module performs FFT operation on the digital signals, and sends the FFT data to the S-band FFT module;
the S frequency band FFT module performs IFFT conversion on the FFT data to obtain an anti-interference digital baseband signal, and outputs the anti-interference digital baseband signal to the S frequency band capturing module;
the S frequency band capturing module captures the anti-interference digital baseband signal to obtain a capturing processing result, and sends the capturing processing result to the S frequency band signal tracking module;
the S frequency band signal tracking module performs frame synchronization on the capturing processing result, and solves a remote control signal and a ranging tone, and sends the remote control signal to the S frequency band remote control signal processing module; transmitting the ranging sound to an S-band ranging signal processing module;
the S frequency band remote control signal processing module outputs a remote control data stream and a corresponding remote control clock according to the remote control signal;
the S-band ranging signal processing module forwards ranging voice to the S-band telemetry data framing module;
and the S-band telemetry data framing module modulates the ranging voice and the S-band telemetry signal sent by the upper computer to generate a downlink baseband signal and outputs the modulated S-band baseband signal.
9. The S/C band antenna base integrated measurement and control terminal of claim 8, wherein: the capturing process specifically comprises the following steps:
generating a regenerated carrier wave, and performing down-conversion on the anti-interference digital baseband signal to finish carrier wave stripping;
performing related operation on the data group codes after carrier stripping, and then accumulating;
FFT is carried out on the accumulated data, and detection judgment is carried out on FFT operation results;
capturing according to the detection judgment result, and outputting a capturing processing result.
10. The S/C band antenna base integrated measurement and control terminal of claim 8, wherein: the acquisition processing results comprise pseudo code phase of the spread spectrum signal, rough estimation of carrier Doppler frequency shift and acquisition state.
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