CN116930893A - Multichannel consistency calibration method based on optical fiber data platform - Google Patents
Multichannel consistency calibration method based on optical fiber data platform Download PDFInfo
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- CN116930893A CN116930893A CN202310905972.4A CN202310905972A CN116930893A CN 116930893 A CN116930893 A CN 116930893A CN 202310905972 A CN202310905972 A CN 202310905972A CN 116930893 A CN116930893 A CN 116930893A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 28
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Abstract
The invention discloses a multichannel consistency calibration method based on an optical fiber data platform, and belongs to the technical field of array measurement and control and phased array radar. The invention can rapidly realize the consistency calibration work of the receiving channels and the transmitting channels of the multichannel system by utilizing the generalized network protocol and the optical fiber data platform, thereby realizing the coherent combination of the transmitting and receiving of a plurality of channels and greatly enhancing the detection power of the array measurement and control and the phased array radar. The invention does not need to manually calibrate or rely on complex signal processing algorithms by means of a testing instrument (comprising a vector network analyzer, a frequency spectrograph and the like), and has the advantages of simple structure, strong practicability, high precision and the like.
Description
Technical Field
The invention relates to the technical field of array measurement and control and phased array radar, in particular to a multichannel consistency calibration method based on an optical fiber data platform, which is applied to zero value calibration of a phased array and array measurement and control system, and can eliminate inconsistency of amplitude and phase of signals received and transmitted by different channels through zero value calibration, thereby realizing coherent synthesis of transmission and reception of a plurality of channels and greatly enhancing detection power of the array measurement and control and phased array radar.
Background
Zero value calibration is a critical ring for large-scale digital array measurement and control systems or digital phased array systems, and accurate beam control of the array systems and the phased array systems can be realized only by accurately calibrating the zero values of all receiving channels and transmitting channels, so that the aims of enhancing target direction signals and simultaneously inhibiting interference in other directions are fulfilled. The inconsistency of the multi-channel system is usually caused by the difference of radio frequency devices (including antennas, mixers, filters and the like) in the channels, the zero value calibration of the system is performed, and the amplitude and phase calibration values on all the receiving channels and the transmitting channels need to be accurately known, so that the workload is large. The traditional channel calibration method of the large-scale digital array system and the digital phased array system mainly carries out manual calibration by means of a testing instrument (comprising a vector network analyzer, a frequency spectrograph and the like), has large calibration workload or depends on a complex signal processing algorithm, and the calibration precision is difficult to ensure. The invention aims to provide a general multi-channel calibration method for a large digital array or phased array system, which utilizes calibration channels to construct a receiving calibration working mode and an emitting calibration working mode, realizes the quick implementation of one-key calibration working, simultaneously adopts an optical fiber and a generalized UDP network protocol to realize the calibration work of all the emitting channels and the receiving channels at one time, and the calibration result is only related to the hardware characteristics of each channel, thereby having the characteristics of high precision and high reliability.
Disclosure of Invention
The invention mainly aims to provide a calibration method capable of rapidly and accurately calibrating amplitude and phase consistency of multiple receiving channels and multiple transmitting channels in a large digital array and phased array system. The method takes a second pulse signal provided by external time-frequency equipment as a reference, can realize the consistency calibration work of all receiving channels and transmitting channels at one time by means of an independent calibration channel and an optical fiber data platform, and has the characteristics of simple system structure, quick calibration flow and high precision.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the multi-channel consistency calibration method based on the optical fiber data platform is realized based on a calibration system, and the calibration system comprises a data platform, multi-channel equipment to be tested, a mixer, a horn antenna, time-frequency equipment, a 1-way calibration AD channel and a 1-way calibration DA channel, wherein the number N of the channels of the multi-channel equipment to be tested is more than or equal to 2, and the method specifically comprises the following steps:
the equipment to be tested works in a receiving calibration working mode:
(1) The device to be tested plays a single-tone signal through the calibration DA channel, and the single-tone signal is radiated through the horn antenna after being changed to a radio frequency signal through the mixer, meanwhile, the device to be tested adds time scale information to sampling signals of N receiving channels, and then the sampling signals are packaged and transmitted back to the data platform through the optical fiber according to the UDP network protocol;
(2) The data platform judges the time slots according to the network data returned by the optical fiber, and then stores 1 whole second of sampling data containing N receiving channel signals;
(3) The data platform carries out FFT analysis on sampling data containing N receiving channels in 1 whole second, and calculates the amplitude and phase of signals of the N receiving channels;
the equipment to be tested works in the emission calibration working mode:
(4) The device to be tested takes N seconds as a period and 1 second as an interval, N emission channels are used for broadcasting signals in a round-robin mode, meanwhile, a single-tone signal received by a horn antenna is connected to a mixer, the single-tone signal is sent to a calibration AD channel of the device to be tested after being subjected to frequency down conversion by the mixer, the device to be tested adds time scale information to a sampling signal of the calibration AD channel, and then the sampling signal is packaged and is transmitted back to a data platform through an optical fiber according to a UDP network protocol;
(5) The data platform judges the time mark according to the optical fiber return network data and then stores N seconds of sampling data, wherein 1 second of sampling data corresponds to 1 transmitting channel;
(6) The data platform performs FFT analysis on the N seconds of sampling data to calculate the amplitude and phase of the N transmitting channel signals.
Further, the time scale information added to the sampling signal in the steps (1) and (4) is the accumulated count of sampling points contained in each frame of data, and the data processing platform determines the whole second time according to the time scale count and the current sampling rate.
Further, in the step (4), the transmission channel switching is in the form of sampling clock counting.
Compared with the traditional multichannel consistency calibration method for the large-scale digital array and the digital phased array system, the method has the following gain effects:
1. the multichannel consistency calibration method based on the optical fiber data platform can utilize the independent calibration channels to design the corresponding calibration links to rapidly realize consistency calibration work of all receiving channels and transmitting channels, does not need to manually measure all channels by means of a vector network analyzer and other devices, does not need to use a complex signal processing algorithm, and can realize high-precision consistency calibration work by only using single-tone signals.
2. The multichannel consistency calibration method based on the optical fiber data platform has the advantages of simple system structure and low operation difficulty, and meanwhile, the data transmission and the instruction transmission of the system both adopt a generalized standard network protocol, so that the method has the characteristic of high interface universalization degree.
Drawings
FIG. 1 is a schematic diagram of a calibration system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a "receive calibration" operation mode according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an operation mode of "emission calibration" according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples of embodiments thereof, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The invention provides a multichannel consistency calibration method based on an optical fiber data platform, which is realized based on a calibration system, wherein the calibration system comprises 1 data platform server (an upper computer monitoring software and a data storage analysis software are deployed), 1 set of multichannel equipment to be tested (the channel number N (N > =2)), and additionally comprises 1 road marking AD channel and 1 road marking DA channel), 1 mixer, 1 horn antenna and 1 set of time-frequency equipment (a second pulse signal, a sampling clock signal and a local oscillation signal are provided), and the connection mode among the equipment is shown in figure 1; the channel consistency calibration test is carried out in a microwave darkroom to eliminate external interference and multipath influence, so that the reliability of a test result is ensured; two calibration working modes, namely a 'receiving calibration' working mode and a 'transmitting calibration' working mode, are designed aiming at the consistency calibration of all receiving channels and the consistency calibration of all transmitting channels.
For ease of understanding, prior to describing the specific calibration procedure of the present example, the implementation principles of the two modes of operation of the present invention are briefly described as follows:
the signal link in the "receiving calibration" working mode is shown in fig. 2, the device to be tested generates an intermediate frequency single-tone signal by using the calibration DA, and the signal is radiated through the horn antenna after being changed to a radio frequency signal by the mixer. After the sampling signals of all the receiving channels are subjected to extraction filtering in a digital domain and time marks are added, the sampling signals are packaged according to a UDP network protocol and transmitted to a data platform through an optical fiber, wherein time mark information is accumulated and generated according to the number of sampling points contained in each frame of data, so that the data platform can strictly determine the whole second sampling moment of equipment to be tested according to the time mark information, and finally, the amplitude and phase consistency of all the receiving channels can be obtained through FFT analysis.
The signal link in the "transmitting calibration" working mode is shown in fig. 3, the device to be tested is clocked by the sampling clock, N seconds are taken as a period, 1 second is taken as an interval, N channels alternately transmit single-tone signals, after receiving radio frequency signals, the horn antenna down-converts the radio frequency signals to intermediate frequency signals through the mixer, the intermediate frequency signals are collected through the calibration AD channels and extracted and filtered, time scale information is added, the time scale information is packaged according to a UDP network protocol and transmitted to the data platform through the optical fiber, the data platform stores the sampling signals of the calibration AD channels at the whole second moment according to the time scale information, and finally the amplitude and phase consistency of all transmitting channels can be obtained by carrying out FFT analysis on N seconds of stored data.
The embodiment of the invention specifically discloses 1-set phased array radar equipment, which comprises the following steps of:
(1) The method comprises the steps that upper computer monitoring software is used for sending a working macro instruction to equipment to be tested, so that the equipment to be tested works in a receiving calibration working mode, at the moment, the equipment to be tested generates an intermediate frequency single-tone signal which is played through a calibration DA channel, the intermediate frequency single-tone signal is up-converted to a radio frequency signal through a mixer and then is transmitted through a horn antenna, at the moment, the equipment to be tested adds time scale information to the intermediate frequency sampling signals received by 16 receiving channels, and then the intermediate frequency single-tone signal is packaged and transmitted back to a data platform through an optical fiber according to a UDP network protocol;
(2) The data platform judges the data time mark according to the network data returned by the optical fiber, and then stores 1 whole second of sampling data containing N receiving channel signals;
(3) The data platform carries out FFT analysis on 1 whole second of sampling data containing N receiving channels, and calculates the amplitude and phase of 16 receiving channel signals
(4) The method comprises the steps that upper computer monitoring software is used for sending a working macro instruction to equipment to be tested, so that the equipment to be tested works in an emission calibration working mode, at the moment, the equipment to be tested takes 16 seconds as a period, 1 second as an interval, 16 emission channels circularly play single-tone signals, meanwhile, the single-tone signals received by a horn antenna are connected to a mixer, the single-tone signals are sent to a calibration AD channel inlet of the equipment to be tested after being subjected to down-conversion, the equipment to be tested adds time mark information to sampling signals of the calibration AD channel, and then the sampling signals are packaged and transmitted back to a data platform through optical fibers according to a UDP network protocol;
(5) The data platform judges the time mark according to the optical fiber return network data and then stores 16 seconds of sampling data, wherein 1 second of sampling data corresponds to 1 transmitting channel;
(6) The data platform carries out FFT analysis on the data containing 16 seconds of sampling data to calculate the amplitude and the phase of 16 transmitting channel signals
Claims (3)
1. The multi-channel consistency calibration method based on the optical fiber data platform is realized based on a calibration system, and the calibration system comprises a data platform, multi-channel equipment to be tested, a mixer, a horn antenna, time-frequency equipment, a 1-way calibration AD channel and a 1-way calibration DA channel, wherein the number N of the channels of the multi-channel equipment to be tested is more than or equal to 2, and the method is characterized by specifically comprising the following steps:
the equipment to be tested works in a receiving calibration working mode:
(1) The device to be tested plays a single-tone signal through the calibration DA channel, and the single-tone signal is radiated through the horn antenna after being changed to a radio frequency signal through the mixer, meanwhile, the device to be tested adds time scale information to sampling signals of N receiving channels, and then the sampling signals are packaged and transmitted back to the data platform through the optical fiber according to the UDP network protocol;
(2) The data platform judges the time slots according to the network data returned by the optical fiber, and then stores 1 whole second of sampling data containing N receiving channel signals;
(3) The data processing platform performs FFT analysis on 1 whole second of sampling data containing N receiving channels, and calculates the amplitude and phase of the signals of the N receiving channels;
the equipment to be tested works in the emission calibration working mode:
(4) The device to be tested uses a sampling clock generated by time-frequency equipment to time, N seconds are taken as a period, 1 second is taken as an interval, N transmitting channels are used for circulating and playing signals, a horn antenna is used for connecting a received single-tone signal to a mixer, the single-tone signal is sent to a calibration AD channel of the device to be tested after being subjected to frequency down conversion of the mixer, the device to be tested adds time scale information to the sampling signal of the calibration AD channel, and then the sampling signal is packaged and transmitted back to a data platform through an optical fiber according to a UDP network protocol;
(5) The data platform judges the time mark according to the optical fiber return network data and then stores N seconds of sampling data, wherein 1 second of sampling data corresponds to 1 transmitting channel;
(6) The data processing platform performs FFT analysis on the N seconds of sampling data to calculate the amplitude and the phase of N transmitting channel signals.
2. The method for calibrating multi-channel consistency based on an optical fiber data platform according to claim 1, wherein the time scale information added to the sampled signals in the steps (1) and (4) is an accumulated count of sampling points contained in each frame of data, and the data processing platform determines the whole second time according to the time scale count and the current sampling rate.
3. The method for calibrating multi-channel consistency based on an optical fiber data platform according to claim 1, wherein the transmitting channel switching in the step (4) adopts a sampling clock counting mode.
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