CN113824517B - Wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis - Google Patents
Wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis Download PDFInfo
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Abstract
The invention discloses a wireless on-orbit self-adaptive amplitude-phase correction system based on digital beam synthesis, which comprises an energy detection module, a phase coarse compensation module, an SNR estimation module, an amplitude measurement module, a phase measurement module, a correction coefficient calculation module, an amplitude-phase correction module and an amplitude-phase correction coefficient storage module. The self-adaptive amplitude and phase correction system provided by the invention can ensure that signals with SNR more than or equal to 20dB of each channel are selected to calculate and obtain high-precision and high-reliability correction coefficients, compensate multi-period phase differences, avoid judgment of positive and negative pi jump in a single period, ensure that the link layer test is not influenced while the amplitude and phase correction coefficients are calculated, improve the precision and communication efficiency of the correction coefficients, simplify the operation complexity, and have very important significance and very wide application prospect for carrying out high-precision and high-reliability amplitude and phase correction on multiple channels of a satellite-borne digital wave beam forming system.
Description
Technical Field
The invention relates to the technical field of amplitude and phase correction, in particular to a wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis.
Background
Digital beamforming (Digital Beamforming, DBF) refers to weighted summation of sampled data to boost signal power in certain specific directions while suppressing interference power in certain other directions. Compared with an active phased array realized by the traditional analog technology, the digital beam forming technology has obvious advantages in the aspects of precision, stability, flexibility and the like of the system. With the progress of electronic technology, devices such as FPGA and DSP make continuous breakthroughs in terms of performance, volume, power consumption, etc., so that satellite-borne implementation of digital beam forming technology becomes reality and will become one of the development directions in the future. However, the requirements of the digital beam forming system on the amplitude-phase consistency of the radio frequency channels are quite strict, in engineering application, the components of the radio frequency channels are mostly analog devices, the amplitude-phase differences among the channels inevitably exist, the non-consistency of the array antenna and the radio frequency channels can cause the degradation of the digital beam forming performance, including the reduction of the direction finding precision and the degradation of the beam forming performance, so that the digital beam forming system has very important significance in carrying out high-precision and high-reliability amplitude-phase correction on the channels of the satellite-borne digital beam forming system.
Disclosure of Invention
For an on-orbit multi-beam receiver, the detection and correction of multi-channel amplitude-phase inconsistencies can only be achieved by means of the on-board system itself. The invention provides a wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis, which can automatically screen out a received signal with an SNR more than or equal to 20dB to carry out amplitude and phase correction in the satellite on-orbit flight process by utilizing an SNR value estimated in real time when a ground monitoring station injects a modulation signal into a satellite-borne system. The space-borne receiver firstly estimates the amplitude-phase coefficient of the received signal of each channel, and then obtains the amplitude-phase correction coefficient of each channel by matrix inverse operation, thereby realizing amplitude-phase correction. The system does not need to configure additional antennas of a satellite-borne system, does not need to inject additional signals and add other hardware, and has the advantages of simple structure, low hardware cost, stability and easy realization.
In order to achieve the above object, the technical scheme adopted for solving the technical problems is as follows:
The wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis comprises an energy detection module, a phase coarse compensation module, an SNR estimation module, an amplitude measurement module, a phase measurement module, a correction coefficient calculation module, an amplitude and phase correction module and an amplitude and phase correction coefficient storage module, wherein:
The energy detection module is used for receiving the signals after the multichannel intermediate frequency down conversion and filtering extraction, carrying out correlation operation on the received signals and the local sequence, searching peak values, and determining accurate initial positions of the signals of all channels;
The phase coarse compensation module is used for moving the multi-channel phase difference to be within one sampling point;
The SNR estimation module is used for selecting burst signal frames with SNR more than or equal to 20 dB;
The amplitude measurement module is used for calculating the energy difference of each channel and determining a reference channel;
the phase measurement module is used for calculating the relative phase difference of each channel relative to a reference channel and transmitting the relative phase difference to the correction coefficient calculation module;
the correction coefficient calculation module is used for obtaining the amplitude and phase correction coefficient of each channel by matrix inverse operation according to the amplitude and phase coefficients of the received signals of each channel obtained by the amplitude measurement module and the phase measurement module, and transmitting the amplitude and phase correction coefficient to the amplitude and phase correction module and the amplitude and phase correction coefficient storage module so as to realize amplitude and phase correction;
The amplitude phase correction module is used for carrying out amplitude phase compensation on each channel by utilizing the amplitude phase correction coefficient obtained by the correction coefficient calculation module and transmitting corrected signals of each channel to the DBF system;
and the amplitude and phase correction coefficient storage module is used for storing the amplitude and phase correction coefficient obtained by the correction coefficient calculation module.
Further, the energy detection module is configured to receive the signals after the multichannel intermediate frequency down-conversion and filtering extraction, adopt a processing method of combining UTC frame header time range estimation and sliding window of the GPS, evaluate a difference Δt between a maximum delay and a minimum delay of a satellite uplink burst signal according to a maximum distance and a minimum distance between the satellite and a ship, perform sliding window detection on Δt data at a starting time of each time slot only, find a peak value, determine a starting position of the signal, and transmit the peak value to the phase coarse compensation module.
Further, the phase coarse compensation module is configured to align all channel data by using a FIFO shift register according to the position of the maximum value determined by the multi-channel energy detection module, so that the multi-channel phase difference value is within a sampling point, and transmit the multi-channel phase difference value to the SNR estimation module.
Further, the SNR estimation module is configured to estimate an SNR value of the burst modulation signal, and if the SNR values of all channels are not less than 20dB, transmit the SNR value to the amplitude measurement module, otherwise continue to detect the next burst modulation signal.
Further, selecting l=256 points to calculate a channel signal mean and variance var:
The SNR estimate is:
and (5) performing curve fitting to obtain an accurate SNR value.
Further, the amplitude measurement module is configured to calculate energy values of the channels, and select a channel with centered energy as a reference channel.
Further, the amplitude measurement module determines a reference channel by calculating energy values of the first 1024 points, and transmits the burst modulation signal and the reference channel number to the phase measurement module, and transmits the reference channel number and the energy values of each channel to the correction coefficient calculation module.
Further, the reference channel of the phase measurement module is used as the reference channel obtained by the amplitude measurement module, if the absolute value of the obtained relative phase difference of the two channels is more than or equal to 150 degrees, the data after complex multiplication is rotated for 90 degrees, then the phase difference is obtained, and finally the calculated phase value is compensated for-90 degrees again.
Further, the amplitude phase correction coefficient storage module stores the amplitude phase correction coefficient obtained by the correction coefficient calculation module, and transmits the stored correction coefficient to the amplitude phase correction module through a power-on or remote control instruction.
Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme:
the invention provides a wireless on-orbit self-adaptive amplitude-phase correction system based on digital beam synthesis, which combines a satellite network, ensures high-precision and high-reliability correction effect, reduces calculation errors caused by satellite-ground space positions through SNR estimation, and improves test accuracy and test efficiency; the system can correct the multi-period phase difference through the energy detection module, and ensures that the phase difference is within one sampling point through the phase coarse compensation module; the algorithm adopted by the phase measurement module avoids the judgment of positive and negative pi jump, and the accurate phase difference between each channel and the calibration channel is obtained; the system adopts a physical layer modulation signal, does not need a ground monitoring station to additionally inject a single-frequency correction signal with a certain signal-to-noise ratio into the satellite-borne system, reduces uncertainty caused by a satellite-to-ground link, and achieves the effects of real-time processing and self-adaption. The wireless on-track amplitude phase correction self-adaptive system provided by the invention can ensure that signals with SNR more than or equal to 20dB of each channel are selected to calculate and obtain high-precision and high-reliability correction coefficients, compensate multi-period phase differences, avoid judgment of positive and negative pi jump in a single period, ensure that the link layer test is not influenced while the amplitude phase correction coefficients are calculated, improve the coefficient precision and communication efficiency, and simplify the operation complexity.
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In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the invention and that other drawings may be obtained from these drawings by those skilled in the art without inventive effort. In the accompanying drawings:
FIG. 1 is a schematic block diagram of an adaptive amplitude and phase correction system based on digital beam synthesis according to an embodiment of the present invention;
FIG. 2 is a flow chart of the modules of the adaptive system for amplitude and phase correction according to one embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the present embodiment discloses a wireless on-orbit adaptive amplitude-phase correction system based on digital beam synthesis, which includes an energy detection module, a phase coarse compensation module, an SNR estimation module, an amplitude measurement module, a phase measurement module, a correction coefficient calculation module, an amplitude-phase correction module and an amplitude-phase correction coefficient storage module, wherein:
The energy detection module is used for receiving the signals after the multichannel intermediate frequency down conversion and filtering extraction, carrying out correlation operation on the received signals and the local sequence, searching peak values, and determining accurate initial positions of the signals of all channels;
The phase coarse compensation module is used for moving the multi-channel phase difference to be within one sampling point;
and the SNR estimation module is used for selecting burst signal frames with SNR more than or equal to 20 dB. Since only one sample can obtain good correction effect when the signal-to-noise ratio is high. The method reduces the influence of the physical links on the satellite and the ground. When the ground monitoring station continuously transmits the modulated signals in the satellite in-orbit visible range, the scheme can automatically screen out the signals meeting the requirements and calculate the amplitude-phase correction coefficients.
The amplitude measurement module is used for calculating the energy difference of each channel and determining a reference channel;
the phase measurement module is used for calculating the relative phase difference of each channel relative to a reference channel and transmitting the relative phase difference to the correction coefficient calculation module;
the correction coefficient calculation module is used for obtaining the amplitude and phase correction coefficient of each channel by matrix inverse operation according to the amplitude and phase coefficients of the received signals of each channel obtained by the amplitude measurement module and the phase measurement module, and transmitting the amplitude and phase correction coefficient to the amplitude and phase correction module and the amplitude and phase correction coefficient storage module so as to realize amplitude and phase correction;
The amplitude phase correction module is used for carrying out amplitude phase compensation on each channel by utilizing the amplitude phase correction coefficient obtained by the correction coefficient calculation module and transmitting corrected signals of each channel to the DBF system;
and the amplitude and phase correction coefficient storage module is used for storing the amplitude and phase correction coefficient obtained by the correction coefficient calculation module.
In this embodiment, taking a satellite multi-beam based on a VDE communication system as an example, the number of beam is 8. The energy detection module adopts a processing method of combining UTC frame head time range estimation and double sliding windows of GPS, and evaluates the difference delta T between the maximum delay and the minimum delay of the uplink burst signal of the satellite according to the maximum and minimum distances from the satellite to the ship, if the maximum delay difference according to the VDE proposal is 8ms, the starting time of each time slot is aligned with the fixed UTC time (2250 VDE time slots are arranged in each minute period of UTC), wherein only the delta T data of the starting time of each time slot is detected by the double sliding window method, firstly, the received 8 paths of multichannel VDE intermediate frequency signals are subjected to down-conversion and filtering extraction in parallel, the sampling rate of the extracted signals is 4 times of symbol rate, and the UTC time is started according to the fixed time slots. For example 48 symbols in length according to the synchronization sequence specified by ITU-R M.2092-0+ (VDE), the symbol rate of the VDE is 33.6khz/s. 1075 symbols are included in 8ms after 4 times sampling, and the length of the spread spectrum sequence is 3072 symbols, so 4096 symbols are adopted for frequency correlation operation. Firstly, carrying out Fourier transform on received 4096 symbols, then carrying out complex multiplication on the received 4096 symbols with a local sequence, finally carrying out Fourier inverse operation on the complex signals, searching peak values, determining accurate starting positions of signals of all channels, and transmitting burst signals and the starting positions of all channels to the coarse phase compensation module.
Further, the phase coarse compensation module is configured to align all channel data by using a FIFO shift register according to the position of the maximum value determined by the multi-channel energy detection module, so that the multi-channel phase difference value is within a sampling point, wait for the last signal to obtain the starting position, read out 8 signals at the same time, and send the 8 signals to the SNR estimation module at the same time. The module adapts the system to environments where multi-period phase differences exist.
Further, the SNR estimation module is configured to estimate an SNR value of the burst modulation signal, and if the SNR values of all channels are not less than 20dB, transmit the SNR value to the amplitude measurement module, otherwise continue to detect the next burst modulation signal. Selecting L=256 points to calculate a channel signal mean and variance var:
The SNR estimate is:
and (5) performing curve fitting to obtain an accurate SNR value.
Further, the amplitude measurement module is configured to calculate energy values of the channels, select a reference channel, and calibrate other channels. Because the DBF system can amplify the received signals, the selection of the signals with larger energy easily causes signal overflow, and the signals with smaller energy can not guarantee the signal quality. Therefore, the system selects the signal with centered energy as a reference channel on the premise of ensuring that the signal is not overflowed and the signal quality is ensured. Specifically, the amplitude measurement module determines a reference channel by calculating energy values of the first 1024 points, sends a burst modulation signal and a reference channel number to the phase measurement module, and sends the reference channel number and the energy values of each channel to the correction coefficient calculation module.
Further, the reference channel of the phase measurement module uses the reference channel obtained by the amplitude measurement module, if the absolute value of the obtained relative phase difference of the two channels is more than or equal to 150 degrees, the data after complex multiplication is rotated for 90 degrees, the phase difference is obtained, and finally the calculated phase value is compensated for-90 degrees again, and the algorithm adopted by the phase measurement module avoids the judgment of positive and negative pi jump, so that the obtained relative phase value can accurately reflect the phase between the phase value and the reference channel.
Further, the amplitude phase correction coefficient storage module stores the amplitude phase correction coefficient obtained by the correction coefficient calculation module, and transmits the stored correction coefficient to the amplitude phase correction module through a power-on or remote control instruction.
The wireless on-orbit self-adaptive amplitude-phase correction system based on digital beam synthesis is provided, the system is combined with a satellite network, the high-precision and high-reliability correction effect is guaranteed, the scheme not only can ensure that signals with SNR more than or equal to 20dB of each channel are selected to calculate and obtain the high-precision and high-reliability correction coefficient, compensate multi-period phase difference and avoid judgment of positive and negative pi jump in a single period, but also can ensure that the link layer test is not influenced while the amplitude-phase correction coefficient is calculated, the coefficient precision and the communication efficiency are improved, and the operation complexity is simplified.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. The wireless on-orbit self-adaptive amplitude and phase correction system based on digital beam synthesis is characterized by comprising an energy detection module, a phase coarse compensation module, an SNR estimation module, an amplitude measurement module, a phase measurement module, a correction coefficient calculation module, an amplitude and phase correction module and an amplitude and phase correction coefficient storage module, wherein:
The energy detection module is used for receiving the signals after multichannel intermediate frequency down-conversion and filtering extraction, adopting a processing method of combining UTC frame head time range estimation and sliding window of a GPS, estimating a difference value delta T of maximum delay and minimum delay of an uplink burst signal of a satellite according to the maximum and minimum distances from the satellite to a ship, detecting delta T data at the starting moment of each time slot by a sliding window method, finding out a peak value, determining the starting position of the signal, and transmitting the signal to the phase coarse compensation module;
the phase coarse compensation module is used for aligning all channel data by using the FIFO shift register according to the position of the maximum value determined by the multi-channel energy detection module, so that the multi-channel phase difference value is within one sampling point and is transmitted to the SNR estimation module;
The SNR estimation module is used for estimating the SNR value of the burst modulation signal, if the SNR value of all channels is more than or equal to 20dB, the SNR value is transmitted to the amplitude measurement module, otherwise, the next burst modulation signal is continuously detected;
The amplitude measurement module is used for calculating the energy value of each channel and selecting the channel with centered energy as a reference channel;
the phase measurement module is used for calculating the relative phase difference of each channel relative to a reference channel and transmitting the relative phase difference to the correction coefficient calculation module; the reference channel of the phase measurement module is used along the reference channel obtained by the amplitude measurement module, if the absolute value of the obtained relative phase difference of the two channels is more than or equal to 150 degrees, the multiplied data is rotated for 90 degrees, then the phase difference is obtained, and finally the calculated phase value is compensated for-90 degrees;
the correction coefficient calculation module is used for obtaining the amplitude and phase correction coefficient of each channel by matrix inverse operation according to the amplitude and phase coefficients of the received signals of each channel obtained by the amplitude measurement module and the phase measurement module, and transmitting the amplitude and phase correction coefficient to the amplitude and phase correction module and the amplitude and phase correction coefficient storage module so as to realize amplitude and phase correction;
The amplitude phase correction module is used for carrying out amplitude phase compensation on each channel by utilizing the amplitude phase correction coefficient obtained by the correction coefficient calculation module and transmitting corrected signals of each channel to the DBF system;
and the amplitude and phase correction coefficient storage module is used for storing the amplitude and phase correction coefficient obtained by the correction coefficient calculation module.
2. The wireless on-orbit adaptive amplitude and phase correction system based on digital beam forming according to claim 1, wherein l=256 points are selected to calculate the channel signal mean and variance var:
The SNR estimate is:
and (5) performing curve fitting to obtain an accurate SNR value.
3. The system of claim 1, wherein the amplitude measurement module determines a reference channel by calculating energy values of the first 1024 points, and transmits the burst modulation signal and the reference channel number to the phase measurement module, and transmits the reference channel number and the energy values of each channel to the correction factor calculation module.
4. The wireless on-orbit adaptive amplitude and phase correction system based on digital beam synthesis according to claim 1, wherein the amplitude and phase correction coefficient storage module stores the amplitude and phase correction coefficient obtained by the correction coefficient calculation module, and transmits the stored correction coefficient to the amplitude and phase correction module through a power-on or remote control instruction.
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| CN115208487B (en) * | 2022-09-16 | 2022-11-29 | 北京天地一格科技有限公司 | Amplitude and phase calibration method and system |
| CN115586501B (en) * | 2022-11-25 | 2023-03-10 | 四川九洲电器集团有限责任公司 | FPGA-based multichannel baseband data amplitude-phase compensation implementation method |
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