CN116366125A - An S/C frequency band space-ground integrated measurement and control terminal - Google Patents

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

An S/C frequency band space-ground integrated measurement and control terminal

technical field

The invention relates to an S/C frequency band space-ground-based integrated measurement and control terminal, which belongs to the technical field of satellite measurement and control.

Background technique

With the development of the aerospace industry, the number of satellites in orbit is increasing year by year, which puts forward high coverage requirements for satellite measurement and control systems. Currently, the main systems supporting TT&C include: ground TT&C system (ground-based TT&C system, TT&C) and tracking and data relay system (space-based TT&C system, TDRSS).

At present, my country has formed a ground measurement and control system based on the C-band standard. At the same time, the tracking and data relay system has also greatly improved the transmission efficiency of space information and improved the coverage of satellite measurement and control. Currently, the second-generation relay satellite system has been put into use. In the future, the space-based measurement and control system based on the tracking and data relay system will be the main direction of the development of measurement and control in my country.

At present, due to the limitation of the coverage angle of the ground measurement and control system, some satellites will float out of the range of ground-based measurement and control, and touch the measurement and control blind area of the ground monitoring station in my country. In order to grasp the telemetry data of the entire satellite in time, and to control and monitor the attitude of the entire satellite in the most timely manner, a relay terminal is often used in the design of the entire satellite. The relay terminal first exchanges data with the Skylink satellites based on space-based measurement and control, and then the Skylink satellites exchange data with the ground monitoring stations in my country, so as to achieve the purpose of indirect communication between the ground and the entire satellite. After the entire satellite enters the stage of orbit determination operation, it will be the measurement and control transponder that will assume the responsibility of data exchange with the ground monitoring station. At this time, the relay terminal is generally used as a cold backup and reserved as a backup.

In order to adapt to the different needs of high-orbit satellites for measurement and control during the orbit change phase and orbit determination phase, give full play to the advantages of aerospace measurement and control networks, improve satellite measurement and control capabilities and coverage, and rationally optimize satellite space layout, quality, and power consumption. A space-ground-based integrated measurement and control terminal that can work in the S-band and C-band has received a lot of attention. There is an urgent need for an S/C-band space-ground-based integrated measurement and control terminal that can switch between different baseband processing programs and working frequency bands according to the signal strength of the receiving channel or ground instructions.

Contents of the invention

The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide an S/C frequency band space-ground integrated measurement and control terminal, the design idea is that the S frequency band radio frequency transceiver channel and the C frequency band radio frequency transceiver channel share a set of digital processing modules, Different baseband processing programs can be switched through automatic/manual commands to achieve differentiated requirements for measurement and control throughout the star.

Technical solution of the present invention is:

The invention discloses an S/C frequency band space-ground integrated measurement and control terminal, including 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 transceiver channel down-converts the S-band radio frequency input signal to the S-band baseband signal and sends it to the digital processing module; up-converts the modulated S-band baseband signal sent by the digital processing module to the S-band radio frequency signal output; The frequency band analog AGC level is given to the digital processing module;

The C-band radio frequency transceiver channel down-converts the C-band radio frequency input signal to the C-band baseband signal and sends it to the digital processing module; the modulated C-band baseband signal sent by the digital processing module is up-converted to the C-band radio frequency signal output and provided to the C-band radio frequency signal. S-band radio frequency transceiver channel and digital processing module synchronization clock source; send C-band analog AGC level to digital processing module;

The digital processing module performs S-band remote control signal processing on the S-band baseband signal sent by the S-band radio frequency transceiver channel, tracks and demodulates the uplink signal, demodulates the S-band remote control command and the S-band ranging tone, and outputs it to the outside; The C-band baseband signal sent by the C-band radio frequency transceiver channel is processed by the C-band remote control signal, and the uplink signal is tracked and demodulated, and the C-band remote control command and the C-band ranging tone are demodulated, and output to the outside; the S sent by the host computer The frequency band telemetry signal and ranging tone are processed to generate a modulated S-band baseband signal and sent to the S-band RF transceiver channel; the C-band telemetry signal and ranging tone sent by the host computer are processed to generate a modulated C-band baseband signal and sent to C-band RF transceiver channel; mode switching is performed according to the S-band analog AGC level of the S-band RF transceiver channel and the C-band analog AGC level of the C-band RF transceiver channel.

In the above-mentioned integrated measurement and control terminal, the S-band radio frequency receiving channel includes an S-band radio frequency receiving channel and an S-band radio frequency transmitting channel, wherein the S-band radio frequency receiving channel includes a low-noise amplifier, a mixer, an amplifier, and an adjustable attenuator , low-pass filter and AGC circuit, after performing low-noise amplification, frequency mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control on the received S-band radio frequency signal, output S-band baseband signal; S-band radio frequency transmission The channel includes a mixer, a filter, an amplifier, a power divider and a detector. After mixing, filtering, amplifying, power dividing and detecting the received baseband signal, the S-band RF signal is output; the S-band RF receiving channel outputs The S-band analog AGC level is given to the digital processing module.

Further, in the above-mentioned integrated measurement and control terminal, the C-band radio frequency transceiver channel includes a C-band radio frequency receive channel, a C-band radio frequency transmit channel and a clock source module; wherein, the C-band radio frequency receive channel includes a low-noise amplifier, a mixer , amplifier, adjustable attenuator, low-pass filter and AGC circuit, after performing low-noise amplification, mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control on the received C-band radio frequency signal, the output C-band Baseband signal; C-band RF receiving channel outputs C-band analog AGC level to the digital processing module; C-band RF transmitting channel includes mixer, filter, amplifier, power divider and detector to mix the received baseband signal , filtering, amplification, power division and detection processing, output the C-band radio frequency signal; the clock source module includes a 10MHz crystal oscillator, which provides clock signals for the C-band radio frequency transceiver channel, the S-band radio frequency transceiver channel and the digital processing module.

Further, in the above-mentioned integrated measurement and control terminal, the digital processing module includes an S-band space-based signal processing module, a C-band ground-based signal processing module, a baseband processing program refresh module, and a PROM; wherein, the PROM includes PROM1 and PROM2; PROM1 uses It is used to run the C-band ground-based signal processing module, and PROM2 is used to run the S-band space-based signal processing module; the baseband processing program refresh module receives the uplink command sent by the ground to power on and off the PROM, or according to the S-band radio frequency transceiver channel of the S-band The analog AGC level and the C-band analog AGC level of the C-band RF transceiver channel enable PROM1 or PROM2 to realize mode switching.

Further, in the above-mentioned integrated measurement and control terminal, the S-band space-based signal processing module performs S-band remote control signal processing on the received S-band baseband signal, tracks and demodulates the uplink signal, and despreads the spread spectrum system, Decode the S-band remote control command and the S-band ranging tone; transparently forward or transcode the S-band telemetry signal and ranging tone sent by the host computer to the S-band transmitting and receiving channel.

The C-band space-based signal processing module performs C-band remote control signal processing on the received C-band baseband signal, tracks and demodulates the uplink signal, performs unified carrier system demodulation, and decodes the C-band remote control command and C-band ranging Tone, transparently forward or transcode the C-band telemetry signal and ranging tone sent by the host computer to the C-band transmit and receive channel.

Further, in the above-mentioned integrated measurement and control terminal, the baseband processing program refresh module includes 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 transceiver channel and the C-band radio frequency transceiver The C-band analog AGC level of the channel is sent to the comparator to generate a judgment state quantity, which is then directly sent to the enable terminal of PROM1, and then sent to the enable terminal of PROM2 after inversion processing to realize the control of PROM1 or PROM2 Enable it to realize mode switching; the matrix command module receives the uplink command sent from the ground, and performs power-on and power-off processing for the PROM storing the processing program by controlling the on-off of the relay.

Further, in the above-mentioned integrated measurement and control terminal, the C-band ground-based signal processing module includes: analog-to-digital conversion ADC1, C-band quadrature down-conversion module, C-band low-pass filter module, C-band CIC filter module, C-band carrier Frequency identification capture and tracking module, C-band remote control subcarrier demodulation module, C-band ranging demodulation and forwarding module, C-band telemetry signal processing module and digital-to-analog conversion DAC1; among them,

Analog-to-digital conversion ADC1 converts the C-band baseband signal sent by the C-band radio frequency receiving channel into a digital signal;

The C-band quadrature down-conversion module performs quadrature down-conversion to form a baseband signal;

The C-band low-pass filter module and the C-band CIC filter module perform low-pass filtering and CIC filtering on the baseband signal, and send the filtered baseband signal to the C-band carrier frequency discrimination capture and tracking module, and perform feedback processing until it is stable, and complete the capture and tracking , and then send the stable baseband signal to the C-band remote control subcarrier demodulation module and C-band ranging demodulation and forwarding module; at the same time, the C-band telemetry signal processing module sends the C-band telemetry signal PSK code and ranging PM modulation is performed on the tone and sent to the C-band RF transmission channel; or the PCM code stream of the C-band telemetry signal sent by the host computer is PSK-modulated and then PM-modulated, and then digital-to-analog conversion is performed through the digital-to-analog conversion DAC1, and then sent to the C-band Frequency band radio frequency transmission channel.

Further, in the above-mentioned integrated measurement and control terminal, the S-band space-based signal processing module includes: analog-to-digital conversion ADC2, S-band anti-jamming module, S-band FFT module, S-band capture module, S-band signal tracking module, S-band remote control Signal processing module, S-band ranging signal processing module, S-band telemetry data framing module and digital-to-analog conversion DAC2; wherein,

Analog-to-digital conversion ADC2 converts the S-band baseband signal into a digital signal and sends it to the S-band anti-jamming module;

The S-band anti-jamming module performs FFT operation on the digital signal, and sends the data after FFT to the S-band FFT module;

The S-band FFT module performs IFFT transformation on the data after FFT to obtain the anti-interference digital baseband signal, which is output to the S-band capture module;

The S-band capture module captures and processes the digital baseband signal after anti-interference, obtains the capture processing result, and sends it to the S-band signal tracking module;

The S-band signal tracking module performs frame synchronization on the capture and processing results, decodes the remote control signal and ranging tone, and sends the remote control signal to the S-band remote control signal processing module; sends the ranging tone to the S-band ranging signal processing module;

The S-band remote control signal processing module outputs the remote control data stream and the corresponding remote control clock according to the remote control signal;

The S-band ranging signal processing module forwards the ranging tone to the S-band telemetry data framing module;

The S-band telemetry data framing module modulates the ranging tone and the S-band telemetry signal sent by the host computer to generate a downlink baseband signal, and outputs the modulated S-band baseband signal.

Further, in the above-mentioned integrated measurement and control terminal, the capture processing is specifically:

Generate a regenerated carrier wave, down-convert the digital baseband signal after anti-interference, and complete the carrier stripping;

Carrier stripped data group code related operations, and then accumulated;

Perform FFT on the accumulated data, and perform detection and judgment on the FFT operation results;

Capture according to the detection and judgment result, and output the capture processing result.

In the above-mentioned integrated measurement and control terminal, the acquisition processing results include the pseudo-code phase of the spread spectrum signal, the rough estimation of the carrier Doppler frequency shift and the acquisition state.

The beneficial effects of the present invention and prior art are:

(1) The S/C frequency band space-ground-based integrated measurement and control terminal of the present invention, compared with conventional S-band space-based relay terminals and C-band ground-based measurement and control transponders, can simultaneously possess the ability of space-ground-based integrated measurement and control terminal, saving Half the number of products, on the premise of achieving the same function, effectively reduces the weight, volume, and power consumption of the satellite platform. It is an integrated, miniaturized, and integrated design with obvious advantages.

(2) The S/C band space-ground-based integrated measurement and control terminal of the present invention has a dual-mode design scheme of manual/automatic processing for the baseband processing program refresh module, which can realize the S-band space-based signal processing module/C-band ground-based signal The active switching between processing modules is also manually set according to the needs of satellite users and actual needs to choose to use the S-band space-based signal processing module/C-band ground-based signal processing module.

(3) The present invention can adapt to the different types of telemetry data types (telemetry data/telemetry PCM code data after PSK modulation) sent by the host computer to the S/C frequency band space-ground integrated measurement and control terminal, and switch different working modes according to the instructions. The telemetry data sent by the host computer is processed differently.

(4) The space-ground-based integrated measurement and control terminal in the S/C frequency band of the present invention has the characteristics of strong function and performance scalability, and can realize space-based measurement and control and ground-based measurement and control on the same hardware platform; in addition, according to different needs, While keeping the hardware design unchanged, the signal processing module in the digital processing module is changed to realize the measurement and control of the unified carrier system of the S-band. It can solve the mass production and mass launch of satellites that require multi-band measurement and control.

(5) In the S/C frequency band space-ground integrated measurement and control terminal of the present invention, the frequency accuracy of the S frequency band transmitting/receiving local oscillator and the C frequency band transmitting/receiving local oscillator are controlled at 1kHz, and the frequency accuracy is high, which is aimed at the increasingly tight frequency resources It can adapt to different frequency point requirements without changing the circuit design, effectively solve the current situation of frequency resource conflicts, and reduce frequency resource coordination problems.

(6) In the S/C-band space-ground-based integrated measurement and control terminal of the present invention, the S-band signal and the C-band signal of the downlink output signal can be output at the same time, or one signal can be selected and output separately according to requirements. With the adaptive selection of the uplink signal, it can realize the selection of multiple working modes under a set of products, and the product has good adaptability and strong practicability.

Description of drawings

Fig. 1 is a working principle block diagram of the present invention;

Fig. 2 is a working principle block diagram of the C-band radio frequency transceiver module of the present invention;

Fig. 3 is a working principle block diagram of the S-band radio frequency transceiver module of the present invention;

Fig. 4 is a working principle block diagram of the C-band ground-based signal processing module of the present invention;

Fig. 5 is a working principle block diagram of the S-band space-based signal processing module of the present invention;

Fig. 6 is a working principle block diagram of the baseband processing program refreshing module of the present invention.

Detailed ways

The patent of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the present invention discloses an S/C band space-ground integrated measurement and control terminal, including an S-band radio frequency transceiver channel, a C-band radio frequency transceiver channel, and a digital processing module; wherein,

The S-band radio frequency transceiver channel down-converts the S-band radio frequency input signal to the S-band baseband signal and sends it to the digital processing module; up-converts the modulated S-band baseband signal sent by the digital processing module to the S-band radio frequency signal output; The frequency band analog AGC level is given to the digital processing module;

The C-band radio frequency transceiver channel down-converts the C-band radio frequency input signal to the C-band baseband signal and sends it to the digital processing module; the modulated C-band baseband signal sent by the digital processing module is up-converted to the C-band radio frequency signal output and provided to the C-band radio frequency signal. S-band radio frequency transceiver channel and digital processing module synchronization clock source; send C-band analog AGC level to digital processing module;

The digital processing module performs S-band remote control signal processing on the S-band baseband signal sent by the S-band radio frequency transceiver channel, tracks and demodulates the uplink signal, demodulates the S-band remote control command and the S-band ranging tone, and outputs it to the outside; The C-band baseband signal sent by the C-band radio frequency transceiver channel is processed by the C-band remote control signal, and the uplink signal is tracked and demodulated, and the C-band remote control command and the C-band ranging tone are demodulated, and output to the outside; the S sent by the host computer The frequency band telemetry signal and ranging tone are processed to generate a modulated S-band baseband signal and sent to the S-band RF transceiver channel; the C-band telemetry signal and ranging tone sent by the host computer are processed to generate a modulated C-band baseband signal and sent to C-band RF transceiver channel; mode switching is performed according to the S-band analog AGC level of the S-band RF transceiver channel and the C-band analog AGC level of the C-band RF transceiver channel.

As shown in Figure 2, the S-band radio frequency transceiver channel includes an S-band radio frequency receiving channel and an S-band radio frequency transmitting channel, wherein the S-band radio frequency receiving channel includes a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, and a low-pass filter The device and AGC circuit, after performing low-noise amplification, frequency mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control on the received S-band radio frequency signal, output the S-band baseband signal; the S-band radio frequency transmission channel includes frequency mixing After mixing, filtering, amplifying, power dividing and detecting the received baseband signal, the S-band RF signal is output; the S-band RF receiving channel outputs the S-band analog AGC level to the digital processing module.

As shown in Figure 3, the C-band RF transceiver channel includes a C-band RF receive channel, a C-band RF transmit channel, and a clock source module; wherein, the C-band RF receive channel includes a low-noise amplifier, a mixer, an amplifier, and an adjustable attenuator , low-pass filter and AGC circuit, after performing low-noise amplification, frequency mixing, amplification, attenuation adjustment, low-pass filtering and AGC automatic gain control on the received C-band RF signal, output C-band baseband signal; C-band RF receiver The channel outputs the C-band analog AGC level to the digital processing module; the C-band radio frequency transmission channel includes a mixer, filter, amplifier, power divider and detector to perform mixing, filtering, amplification and power division on the received baseband signal After processing and detection, the C-band radio frequency signal is output; the clock source module includes a 10MHz crystal oscillator, which provides clock signals for the C-band radio frequency transceiver channel, the S-band radio frequency transceiver channel and the digital processing module.

As shown in Figure 1, the digital processing module includes an S-band space-based signal processing module, a C-band ground-based signal processing module, a baseband processing program refresh module, and a PROM; among them, the PROM includes PROM1 and PROM2; PROM1 is used to load the C-band ground-based signal processing module. Module, PROM2 is used to load the S-band space-based signal processing module; the baseband processing program refresh module receives the uplink command sent by the ground to enable the on-off processing of the PROM, or according to the S-band analog AGC level and C The C-band analog AGC level of the frequency-band RF transceiver channel enables PROM1 and PROM2 to realize mode switching.

The S-band space-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 spread spectrum system, and decodes the S-band remote control command and the S-band ranging tone; Transparently forward or transcode the S-band telemetry signal and ranging tone sent by the host computer to the S-band transmitting and receiving channel.

The C-band space-based signal processing module performs C-band remote control signal processing on the received C-band baseband signal, tracks and demodulates the uplink signal, performs unified carrier system demodulation, and decodes the C-band remote control command and the C-band ranging tone. Transparently forward or transcode the C-band telemetry signal and ranging tone sent by the host computer to the C-band transmit and receive channel.

The baseband processing program refresh module includes 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 RF transceiver channel and the C-band analog AGC level of the C-band RF transceiver channel, and sends them to the comparator , to generate a judgment state quantity, which is directly sent to the enable terminal of PROM1, and sent to the enable terminal of PROM2 at the same time after inversion processing, so as to enable PROM1 or PROM2 to realize mode switching; the matrix command module receives The uplink command sent from the ground controls the on and off of the relay to power on and off the PROM that stores the processing program.

As shown in Figure 4, the C-band ground-based signal processing module includes: analog-to-digital conversion ADC1, C-band quadrature down-conversion module, C-band low-pass filter module, C-band CIC filter module, C-band carrier frequency discrimination capture and tracking module, C-band Frequency-band remote control subcarrier demodulation module, C-band ranging demodulation and forwarding module, C-band telemetry signal processing module and digital-to-analog conversion DAC1; wherein, the analog-to-digital conversion ADC1 converts the C-band baseband signal sent by the C-band radio frequency receiving channel to analog The C-band quadrature down-conversion module performs quadrature down-conversion to form a baseband signal; the C-band low-pass filter module and the C-band CIC filter module perform low-pass filtering and CIC filtering on the baseband signal, and the filtered The baseband signal is sent to the C-band carrier frequency discrimination capture and tracking module, and after feedback processing until it is stable, the capture and tracking is completed, and then the stable baseband signal is sent to the C-band remote control subcarrier demodulation module and the C-band ranging demodulation and forwarding module ; At the same time, the C-band telemetry signal processing module PM-modulates the C-band telemetry signal PSK code and the ranging tone sent by the host computer, and sends them to the C-band radio frequency transmission channel; or processes the C-band telemetry signal PCM code stream sent by the host computer. After PSK modulation, PM modulation is performed, and then digital-to-analog conversion is performed by DAC1, and then sent to the C-band RF transmission channel.

As shown in Figure 5, the S-band space-based signal processing module includes: analog-to-digital conversion ADC2, S-band anti-jamming module, S-band FFT module, S-band capture module, S-band signal tracking module, S-band remote control signal processing module, S-band Frequency-band ranging signal processing module, S-band telemetry data framing module and digital-to-analog conversion DAC2; among them, analog-to-digital conversion ADC2 converts S-band baseband signals into digital signals and sends them to S-band anti-jamming module; S-band anti-jamming module The interference module performs FFT operation on the digital signal, and sends the data after FFT to the S-band FFT module; the S-band FFT module performs IFFT transformation on the data after FFT to obtain the digital baseband signal after anti-jamming, and outputs it to the S-band capture module; The S-band capture module captures and processes the digital baseband signal after anti-jamming, obtains the capture processing result, and sends it to the S-band signal tracking module; the S-band signal tracking module performs frame synchronization on the capture processing result, and decodes the remote control signal and ranging tone, Send the remote control signal to the S-band remote control signal processing module; send the ranging tone to the S-band ranging signal processing module; the S-band remote control signal processing module outputs the remote control data stream and the corresponding remote control clock according to the remote control signal; S-band ranging The signal processing module forwards the ranging tone to the S-band telemetry data framing module; the S-band telemetry data framing module modulates the ranging tone and the S-band telemetry signal sent by the host computer to generate a downlink baseband signal, and outputs the modulated S-band baseband Signal.

The S-band acquisition module performs acquisition processing on the digital baseband signal after anti-interference, and obtains the acquisition processing results, specifically:

Step S91, generate a regenerated carrier, and down-convert the digital baseband signal after anti-interference to complete carrier stripping;

Step S92, perform correlation calculations on the data group codes after carrier stripping, and then accumulate them;

Step S93, performing FFT on the accumulated data, and detecting and judging the FFT operation result;

Step S94 , capture according to the detection and judgment result, and output a capture processing result.

Acquisition processing results, including the pseudo-code phase of the spread spectrum signal, a rough estimate of the carrier Doppler shift, and the acquisition status.

Example

This embodiment provides a design method for an S-band and C-band space-ground-based integrated measurement and control terminal, including an S-band radio frequency transceiver channel, a C-band radio frequency transceiver channel, and a digital processing module.

The S-band RF transceiver channel consists of an S-band receive channel and an S-band transmit channel. As shown in Figure 1, the S-band RF receive channel includes a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low-pass filter, and an AGC. circuits, etc.; where,

The S-band radio frequency receiving channel receives the S-band radio frequency signal input by the front end, and the signal is amplified by the low-noise amplifier and the amplifier for down-conversion processing. After that, the signal enters the attenuator and amplifier in turn for signal matching, then enters the filter and amplifier for filtering, and finally enters the AGC (automatic gain control) circuit for amplification processing, and outputs the baseband signal to the digital processing unit;

The S-band RF transmitter module receives the modulated baseband signal from the digital processing unit, and mixes the modulated baseband signal with the local oscillator signal generated by PLS (phase-locked source) to the first baseband signal, and then performs low-pass After filtering, it is sent to the amplifier; the amplified first baseband signal is mixed with two local oscillators to obtain an S-band radio frequency signal, which is multi-stage amplified after passing through a band-pass filter, and the amplified S-band radio frequency signal is passed through a power divider Two signals are output, one is output as a power telemetry signal through the detector, and the other is output as a downlink S-band signal.

The C-band RF transceiver channel consists of a C-band receive channel, a C-band transmit channel, and a clock source module. As shown in Figure 3, the C-band RF receive channel includes a low-noise amplifier, a mixer, an amplifier, an adjustable attenuator, a low-pass filter and AGC circuit, etc.; where,

The C-band radio frequency receiving channel receives the C-band radio frequency signal input by the front end, and the signal is amplified by the low-noise amplifier and the amplifier for down-conversion processing. After that, the signal enters the attenuator and amplifier in turn for signal matching, then enters the filter and amplifier for filtering, and finally enters the AGC (automatic gain control) circuit for amplification processing, and outputs the baseband signal to the digital processing unit;

The C-band RF transmitter module receives the modulated baseband signal from the digital processing unit, and mixes the modulated baseband signal with the local oscillator signal generated by PLS (phase-locked source) to the first baseband signal, and then performs low-pass After filtering, it is sent to the amplifier; the amplified first baseband signal is mixed with two local oscillators to obtain a C-band radio frequency signal, which is multi-stage amplified after passing through a band-pass filter, and the amplified C-band radio frequency signal is passed through a power divider Two signals are output, one is output as a power telemetry signal through the detector, and the other is output as a downlink C-band signal. At the same time, it can provide a stable 10MHz clock source for the S-band RF transceiver channel.

The digital processing module includes a C-band ground-based signal processing module, an S-band space-based signal processing module, and a baseband processing program refresh module;

Among them, the C-band baseband signal processing module is shown in Figure 4, including: ADC1 (digital-to-analog conversion), DAC1 (analog-to-digital conversion), C-band quadrature down-conversion module, C-band low-pass filter module, and C-band CIC filter module , C-band carrier frequency discrimination capture and tracking module, C-band remote control subcarrier demodulation module, C-band ranging demodulation and forwarding module, C-band telemetry signal processing unit;

When processing the uplink signal of the C-band ground-based unified carrier system, the C-band quadrature down-conversion module first performs quadrature down-conversion on the digital signal sent by ADC1 to form a baseband signal, then performs low-pass filtering and CIC filtering, and then sends the signal to Enter the frequency discrimination module, do feedback processing until it is stable, complete the capture and tracking, and then send the baseband signal obtained after low-pass filtering to the remote control subcarrier demodulation module and the ranging tone demodulation and forwarding module; at the same time, send the host computer to The telemetry PSK signal (in PSK mode) is directly PM-modulated together with the ranging tone and sent to DAC1; or the telemetry PCM code (in PCM mode) sent by the host computer is PSK-modulated and then PM-modulated, and then sent to DAC1 ( analog-to-digital conversion).

The S-band baseband signal processing module, as shown in Figure 5, includes: ADC2, DAC2, S-band anti-jamming module, S-band FFT module, S-band capture module, S-band signal tracking module, S-band remote control signal processing module, S-band Ranging signal processing module and S-band telemetry data framing module.

When processing the uplink signal of the S-band space-based spread spectrum system, the S-band anti-jamming module performs FFT operation on the currently input sampling data frame of ADC2, and sends the judged data to the S-band FFT module for IFFT transformation to obtain the anti-jamming result The data is output to the S-band capture module. The S-band acquisition module receives the anti-jamming digital baseband signal, generates a regenerated carrier to down-convert the digital baseband signal, and completes carrier stripping. Carrier stripped data group code correlation calculation, and then accumulate; FFT is performed on the accumulated data, and the FFT operation result is detected and judged; in order to obtain a more accurate carrier value when the capture is completed, an S-band carrier tracking module is also required Continuously update the carrier frequency point. Then the pseudo-code phase of the spread spectrum signal and the rough estimate of the carrier Doppler frequency shift and the acquisition status are output to the S-band signal tracking module. After the pseudo-code phase and carrier frequency are tracked and locked, the S-band signal tracking module completes the frame synchronization according to the remote control data. Then the remote control signal is sent to the S-band remote control signal processing module, and the remote control data stream and the corresponding remote control clock are decoded, and output to the subsequent equipment together; at the same time, the S-band telemetry data framing module modulates the ranging signal and the telemetry signal to generate a downlink The baseband signal outputs the modulated baseband signal through DAC2, and sends the modulated baseband signal to the S-band radio frequency transmitting module.

The baseband processing program refresh module, as shown in Figure 6, includes: a power comparison module and a matrix instruction module.

There are two ways to load the baseband processing program refresh module software program run by the FPGA in the digital processing module. The first is to load the corresponding program through the output value of the power comparison circuit. First of all, the power supply control switch needs to be switched to the output of the comparator. The power comparison circuit receives the AGC value of the S-band receiving channel and the AGC value of the C-band receiving channel at the same time, and compares them, and outputs "0" or "1" to the PROM. The enable terminal is designed with an inverter before the input of the enable terminal of PROM2 to ensure that only one of PROM1 and PROM2 is enabled; the second is to send the matrix command through the ground to carry out the pull-in of the relay at the front end of the corresponding PROM power supply circuit At this time, the enable terminal first needs to manually switch to the normal high signal, and then rely on the ground matrix command to control the on and off of the relay, and then supply power to the PROM, so as to select and control the corresponding program loaded in the PROM.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

The content that is not described in detail in the specification of the present invention belongs to the well-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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