Channel calibration compensation method based on low-temperature receiving array

Abstract

In order to solve the problem that channel amplitude and phase need to be calibrated and compensated in real time when a low-temperature phased array radar works normally, the invention provides a channel calibration and compensation method based on a low-temperature receiving array. A function relation of channel amplitude-phase characteristics with respect to temperature is obtained, array surface temperature is further monitored in real time in a radar working process, temperature of each channel is fitted by using a temperature monitoring result, a channel amplitude-phase compensation correction coefficient brought by temperature change is calculated, and channel real-time calibration compensation of the low-temperature receiving array is realized.

Description

Technical Field

[0001] The invention belongs to the field of radar technology, and in particular relates to a channel calibration compensation method based on a cryogenic receiving array. Background Art

[0002] In recent years, the development of technologies such as extremely stealthy aircraft, distributed micro-nano satellites, and high-orbit anti-satellite weapons, as well as centimeter-level space debris detection, require radar detection power to continue to increase. The power of traditional radars depends on the power aperture product, but as the scale of the system increases, the cost and system complexity of radars rise sharply, the platform adaptability and battlefield survivability decrease, and the detection power of radars encounters a bottleneck. High-sensitivity microwave detection technology based on cryogenic refrigeration can effectively reduce radar system noise, improve detection sensitivity, and improve radar detection power under a certain power aperture product. It is an important exploration direction for the future development of radar systems.

[0003] Similar to conventional phased array radars, the normal operation of cryogenic phased array radars also requires calibration and compensation of the amplitude and phase (or simply amplitude and phase) of the channel so that the antenna pattern meets the performance requirements. If the operating temperature of the array changes significantly after the calibration is completed, causing the amplitude and phase characteristics of each channel to change, the calibration process must be re-executed, which is not conducive to the long-term continuous operation of the radar. Especially for cryogenic phased array radars, since the operating temperature of the array itself is relatively low, the relative impact of temperature changes is greater, and a simpler and faster method is needed to compensate for the changes in channel amplitude and phase characteristics caused by temperature changes during the operation of the radar in real time. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a channel calibration compensation method based on a cryogenic receiving array, which can correct the influence of the temperature of each channel in real time during the operation of the cryogenic phased array radar to ensure the channel amplitude consistency of the cryogenic phased array radar. Specifically, the following steps are included:

[0005] (1) Measure the relationship between the amplitude and phase characteristics of the cryogenic phased array radar channel and the temperature, and obtain the amplitude and phase characteristics of each channel of the cryogenic phased array radar as a function of temperature.

[0006] (2) Setting up and measuring the temperature monitoring equipment of the cryogenic phased array radar array, and recording the positions of each temperature monitor and channel on the cryogenic cold plate in two-dimensional coordinates.

[0007] (3) Under the initial working conditions, the calibration signal is used to calibrate the channel consistency of the cryogenic phased array radar, which serves as the benchmark for subsequent real-time calibration compensation.

[0008] (4) During the operation of the cryogenic phased array radar, the array surface temperature monitoring device is used to fit the temperature of each channel, and real-time calibration compensation is performed based on the functional relationship between the channel's amplitude and phase characteristics and temperature.

[0009] Furthermore, the step (1) includes the following specific steps:

[0010] 1) Measurement of the relationship between channel amplitude and phase characteristics and temperature

[0011] For the channel (m,n) of the low-temperature phased array, where m and n represent the mth row and nth column of the channel on the array surface, respectively, a temperature monitoring device and a temperature control device (such as a heating resistor, etc.) are set up close to the channel, and a calibration signal is injected. The temperature of the channel is changed by the temperature control device. At different temperatures, the channel output signal is sampled and recorded. The output signal at a certain temperature T0 is used as a reference to obtain the channel amplitude A and phase at different temperatures T. relative change.

[0012] 2) Fitting of the relationship between channel amplitude and phase characteristics and temperature function

[0013] According to the result in 1), the amplitude A of channel (m,n) is fitted by interpolation method m,n and Phase As a function of temperature:

[0014] A m,n =f m,n (T)

[0015]

[0016] Traverse all channels (m,n) of the cryogenic phased array and obtain all interpolation functions A m,n ,

[0017] Furthermore, the step (2) includes the following specific steps:

[0018] 1) Install temperature monitoring equipment on the cryogenic phased array radar array

[0019] Considering the temperature monitoring accuracy and cost comprehensively, K temperature monitoring devices S1, ..., S K .

[0020] 2) Measure and record the location of temperature monitoring equipment and channels

[0021] The temperature monitoring device S is measured and recorded in the form of two-dimensional coordinates (x, y) i (1≤i≤K) position (x i ,y i), and the position (x) of channel (m,n) m,n ,y m,n ).

[0022] Furthermore, the step (3) includes the following specific steps:

[0023] 1) Recording of the temperature of the temperature monitoring equipment under initial working conditions

[0024] When the radar is fully powered on and the cooling temperature is basically stable, record the temperature of each temperature monitoring device S i (1≤i≤K) Working temperature T under initial working conditions a,i .

[0025] 2) Measurement of channel amplitude and phase characteristics under initial working conditions

[0026] Inject completely consistent calibration signals into each channel, and sample and record the channel output signals.

[0027] 3) Calculation of channel amplitude and phase compensation coefficients under initial working conditions

[0028] Taking a certain channel as the reference, compare the relationship between the output signal amplitude and phase of other channels and this channel, and obtain the amplitude and phase difference as the channel amplitude and phase compensation coefficient A under the initial working conditions. a,m,n and

[0029] Furthermore, the step (4) includes the following specific steps:

[0030] 1) Recording of temperature of temperature monitoring equipment

[0031] When the radar is turned on and works for a period of time, the temperature monitoring device S i (1≤i≤K) temperature T b,i .

[0032] 2) Fitting of channel temperature

[0033] For channel (m,n), select the 4 temperature monitoring devices (S t , S u , S v , S w ), based on the monitored temperature T b,t , T b,u , T b,v , T b,w Calculate the real-time temperature T b,m,n , the calculation method is:

[0034] According to the two-dimensional coordinates recorded in step (2), calculate the distance between the channel (m,n) and the temperature detection device:

[0035] R t 2 =(x m,n -x t ) 2 +(y m,n -y t ) 2

[0036] R u 2 =(x m,n -x u ) 2 +(y m,n -y u ) 2

[0037] R v 2 =(x m,n -x v ) 2 +(y m,n -y v ) 2

[0038] R w 2 =(x m,n -x w ) 2 +(y m,n -y w ) 2

[0039] Among them, R t , R u , R v , R w They are channel (m, n) and temperature detection device S t , S u , S v , S w The distance between.

[0040] Calculate the real-time temperature T of channel (m,n) by weighting according to the inverse square of the distance b,m,n :

[0041]

[0042] According to the same method, based on the temperature monitoring device S t , S u , S v , S w Monitoring temperature T under initial operating conditions a,t , T a,u , T a,v , Ta,w , calculate the temperature T of channel (m,n) under initial working conditions a,m,n :

[0043]

[0044] 3) Calculation of real-time channel amplitude and phase compensation coefficients

[0045] On the basis of the channel amplitude-phase compensation coefficient under the initial working conditions, the channel amplitude-phase characteristic change caused by temperature change is superimposed, and the channel amplitude-phase compensation coefficient is calculated in real time. The calculation method is:

[0046] According to the initial working temperature T a,m,n and real-time temperature T b,m,n , and the functional relationship between the channel amplitude and phase characteristics obtained in step (1) and temperature, calculate the changes in channel amplitude and phase compensation coefficients due to temperature changes

[0047] ΔA a,b,m.n =f m,n (T b,m,n )-f m,n (T a,m,n )

[0048]

[0049] Where ΔA a,b,m.n is the change in amplitude compensation coefficient, is the change of the phase compensation coefficient.

[0050] The change value is superimposed on the channel amplitude and phase compensation coefficients under the initial working conditions to obtain the real-time channel amplitude and phase compensation coefficients:

[0051] A b,m,n =A a,m,n +ΔA a,b,m.n

[0052]

[0053] Among them, A b,m,n and are the real-time compensation coefficients of amplitude and phase respectively.

[0054] The beneficial effects of the present invention are

[0055] During the operation of the cryogenic phased array radar, the amplitude and phase characteristic changes caused by temperature can be corrected in real time, avoiding the time loss caused by frequent channel amplitude and phase consistency calibration operations, and ensuring the channel amplitude and phase consistency of the cryogenic phased array radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1This is a measurement diagram of the relationship between channel amplitude and phase characteristics and temperature.

[0057] Figure 2 Schematic diagram of array surface temperature monitoring. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The present invention includes four steps: (1) measuring the relationship between the amplitude and phase characteristics of the cryogenic phased array radar channel and the temperature, and obtaining the amplitude and phase characteristics of each channel of the cryogenic phased array radar as a function of the temperature; (2) setting and measuring the array surface temperature monitoring equipment of the cryogenic phased array radar, and recording the positions of each temperature monitor and channel on the cryogenic cold plate in two-dimensional coordinates; (3) under the initial working conditions, calibrating the channel consistency of the cryogenic phased array radar using the calibration signal as a reference for subsequent real-time calibration compensation; (4) during the operation of the cryogenic phased array radar, fitting the temperature of each channel through the array surface temperature monitoring equipment, and performing real-time calibration compensation according to the functional relationship between the amplitude and phase characteristics of the channel and the temperature. Each step is explained in detail as follows:

[0060] (1) Measure the relationship between the amplitude and phase characteristics of the cryogenic phased array radar channel and the temperature, and obtain the amplitude and phase characteristics of each channel of the cryogenic phased array radar as a function of temperature. The main purpose of this step is to obtain the amplitude and phase characteristics of each channel of the cryogenic phased array as a function of temperature, so as to provide a basis for the subsequent real-time correction of the amplitude and phase characteristics by monitoring the temperature. In the embodiment, we consider the case of a channel, and place a temperature monitoring device and a temperature control device in close proximity to it. The temperature monitoring device mainly monitors the channel temperature and corresponds the measured amplitude and phase results to the temperature one by one. The temperature control device can be a device such as a heating resistor, and its main function is to artificially control the temperature of the channel by generating heat, so as to obtain the amplitude and phase characteristics at different temperatures. The measurement diagram of the relationship between the amplitude and phase characteristics of a single channel and the temperature is shown in FIG. Figure 1 shown.

[0061] 1) Measurement of the relationship between channel amplitude and phase characteristics and temperature

[0062] Assume that the channel is the channel in the first row and first column on the array, that is, channel (1,1), inject the calibration signal, change the temperature of the channel through the temperature control device, sample and record the channel output signal at different temperatures, adjust the temperature of the channel through the temperature control device, measure the amplitude and phase characteristics of the channel between 20K and 30K, record once every 2K, and use the output signal at 20K as the reference to obtain the amplitude A and phase of the channel at different temperatures An example of the relative change of the measurement results is shown in Table 1.

[0063] Table 1

[0064]

[0065] 2) Fitting of the relationship between channel amplitude and phase characteristics and temperature function

[0066] According to the result in 1), the amplitude A of channel (1,1) is fitted by interpolation method. m,n and Phase Regarding the temperature function, in the embodiment, we use the griddedInterpolant function of matlab for fitting:

[0067] T = [20 22 24 26 28 30];

[0068] A=[0 0.1 0.2 0.3 0.5 0.7];

[0069]

[0070] A 1,1 =f 1,1 (T)=griddedInterpolant(T,A,'spline');

[0071]

[0072] like Figure 2 As shown, in the embodiment, we have a total of 4 channels, traverse these 4 channels, and obtain all interpolation functions f m,n (T), g m,n (T), since the design of the channel is basically the same, to simplify the analysis of the embodiment, we assume that all A in the embodiment m,n , The relationship with relative change of temperature is the same, that is, for all 4 channels, it can be expressed as:

[0073] A=f(T)=griddedInterpolant(T,A,'spline');

[0074]

[0075] (2) Setting up and measuring the temperature monitoring equipment of the cryogenic phased array radar array, and recording the positions of each temperature monitor and channel on the cryogenic cold plate in two-dimensional coordinates. The main purpose of this step is to locate the positions of all temperature monitors and channels, so as to facilitate the subsequent fitting of the channel temperature based on the data of the temperature monitor.

[0076] 1) Install temperature monitoring equipment on the cryogenic phased array radar array

[0077] In an embodiment, Figure 2 As shown, the cryogenic array has four channels, (1,1), (1,2), (2,1) and (2,2), and four temperature monitoring devices S1, S2, S3 and S4 are set on the cryogenic array. It should be noted that this embodiment is only an example to illustrate the principle of the method. The number of channels in an actual cryogenic phased array radar can reach thousands or even tens of thousands. Considering the cost issue, the number of temperature monitoring devices is far less than the number of channels. It is impossible to closely monitor the temperature of each channel, so the temperature fitting method is necessary.

[0078] 2) Measure and record the location of temperature monitoring equipment and channels

[0079] The temperature monitoring device S is measured and recorded in the form of two-dimensional coordinates (x, y) i (1≤i≤4) position (x i ,y i ), and the position (x) of channel (m,n) m,n ,y m,n ). An example of the measurement results is shown in Table 2.

[0080] Table 2

[0081]

[0082]

[0083] (3) Under the initial working conditions, the calibration signal is used to calibrate the channel consistency of the cryogenic phased array radar as a benchmark for subsequent real-time calibration compensation. The main purpose of this step is to initialize the amplitude and phase consistency of the channel and provide the amplitude and phase correction coefficients under the initial working conditions. The subsequent additional correction based on temperature changes is adjusted based on the initial correction coefficients.

[0084] 1) Recording of the temperature of the temperature monitoring equipment under initial working conditions

[0085] When the radar is fully powered on and the cooling temperature is basically stable, record the temperature of each temperature monitoring device S i(1≤i≤K) Temperature T under initial working conditions a,i An example of the measurement results is shown in Table 3.

[0086] Table 3

[0087] <![CDATA[Temperature monitoring device S i > <![CDATA[Temperature T under initial working conditions a,i > <![CDATA[S1]]> 21K <![CDATA[S2]]> 23K <![CDATA[S3]]> 22K <![CDATA[S4]]> 26K

[0088] 2) Measurement of channel amplitude and phase characteristics under initial working conditions

[0089] Inject completely consistent calibration signals into each channel, and sample and record the channel output signals.

[0090] 3) Calculation of channel amplitude and phase compensation coefficients under initial working conditions

[0091] In the embodiment, channel (1,1) is used as a reference, and the relationship between the output signal amplitude and phase of other channels and this channel is compared to obtain the amplitude and phase difference, which is used as the channel amplitude and phase compensation coefficient A under the initial working condition. a,m,n and Examples of initial compensation coefficients are shown in Table 4.

[0092] Table 4

[0093]

[0094]

[0095] (4) During the operation of the cryogenic phased array radar, the array surface temperature monitoring device is used to fit the temperature of each channel, and real-time calibration compensation is performed based on the functional relationship between the channel's amplitude-phase characteristics and temperature. The main purpose of this step is to use the real-time temperature measurement results of the temperature monitoring device during the radar operation to fit the channel temperature, and further obtain additional amplitude-phase correction coefficients based on the relationship between the amplitude-phase characteristics and temperature to ensure that the radar can maintain amplitude-phase consistency when the temperature changes during continuous operation.

[0096] 1) Recording of temperature of temperature monitoring equipment

[0097] When the radar is turned on and works for a period of time, the temperature monitoring device S i (1≤i≤K) temperature T b,i An example of the measurement results is shown in Table 5.

[0098] Table 5

[0099] <![CDATA[Temperature monitoring device S i > <![CDATA[Real-time temperature T b,i > <![CDATA[S1]]> 25K <![CDATA[S2]]> 27K <![CDATA[S3]]> 26K <![CDATA[S4]]> 29K

[0100] 2) Fitting of channel temperature

[0101] For channel (m,n), select the 4 temperature monitoring devices (St , S u , S v , S w ), based on the monitored temperature T b,t , T b,u , T b,v , T b,w Calculate the real-time temperature T b,m,n , the calculation method is:

[0102] According to the two-dimensional coordinates recorded in step (2), calculate the distance between the channel (m, n) and the temperature detection device

[0103] R t 2 =(x m,n -x t ) 2 +(y m,n -y t ) 2

[0104] R u 2 =(x m,n -x u ) 2 +(y m,n -y u ) 2

[0105] R v 2 =(x m,n -x v ) 2 +(y m,n -y v ) 2

[0106] R w 2 =(x m,n -x w ) 2 +(y m,n -y w ) 2

[0107] Among them, R t , R u , R v , R w They are channel (m, n) and temperature detection device S t , S u , S v , S w The distance between.

[0108] In this embodiment, since there are only four temperature monitoring devices S1, S2, S3, and S4, the distances R1, R2, R3, and R4 from the four monitoring devices are calculated for all channels. According to the measurement results in Table 2, the calculation results are shown in Table 6.

[0109] Table 6

[0110] aisle <![CDATA[R1]]> <![CDATA[R2]]> <![CDATA[R3]]> <![CDATA[R4]]> (1,1) 0.0283m 0.0825m 0.0825m 0.1131m (1,2) 0.0825m 0.0283m 0.1131m 0.0825m (2,1) 0.0825m 0.1131m 0.0283m 0.0825m (2,2) 0.1131m 0.0825m 0.0825m 0.0283m

[0111] Calculate the real-time temperature T of channel (m,n) by weighting according to the inverse square of the distance b,m,n :

[0112]

[0113] According to the same method, based on the temperature monitoring device S t , S u , S v , S w Monitoring temperature T under initial operating conditions a,t 、T a,u 、T a,v 、T a,w , calculate the temperature T of channel (m,n) under initial working conditions a,m,n :

[0114]

[0115] In this embodiment, according to the results of Table 3, Table 5 and Table 6, the temperatures of the four channels under the initial working conditions and the real-time working conditions can be calculated, as shown in Table 7.

[0116] Table 7

[0117] aisle <![CDATA[T b,m,n ]]> <![CDATA[T a,m,n ]]> (1,1) 25.46K 21.51K (1,2) 26.95K 23.04K (2,1) 26.23K 22.32K (2,2) 28.35K 25.12K

[0118] 3) Calculation of real-time channel amplitude and phase compensation coefficients

[0119] On the basis of the channel amplitude-phase compensation coefficient under the initial working conditions, the channel amplitude-phase characteristic change caused by temperature change is superimposed, and the channel amplitude-phase compensation coefficient is calculated in real time. The calculation method is:

[0120] According to the initial operating temperature T a,m,n and real-time temperature T b,m,n , and the functional relationship between the channel amplitude and phase characteristics and temperature obtained in step (1), calculate the changes in channel amplitude and phase compensation coefficients due to temperature changes:

[0121] ΔA a,b,m.n =f m,n (T b,m,n )-f m,n (T a,m,n );

[0122]

[0123] Where ΔA a,b,m.n is the change in amplitude compensation coefficient, is the change of the phase compensation coefficient.

[0124] In this embodiment, we have assumed in step (1) that A of all channels m,n , The relationship of relative change with temperature is the same, and can be expressed as f(T) and g(T). Then, using Table 7, we can calculate the value of T for each channel. a,m,n to T b,m,n The compensation coefficient changes caused by temperature changes, the calculation results are shown in Table 8.

[0125] Table 8

[0126]

[0127] The change value is superimposed on the channel amplitude and phase compensation coefficient under the initial working conditions to obtain the real-time channel amplitude and phase compensation coefficient.

[0128] A b,m,n =A a,m,n +ΔA a,b,m.n ;

[0129]

[0130] Among them, A b,m,n and are the real-time compensation coefficients of amplitude and phase respectively.

[0131] In this embodiment, according to Table 4 and Table 8, a real-time compensation coefficient can be calculated, as shown in Table 9.

[0132] Table 9

[0133]

[0134] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A channel calibration compensation method based on a cryogenic receiving array, characterized in that: The following steps are involved: (1) Measure the relationship between the amplitude and phase characteristics of the cryogenic phased array radar channel and the temperature, and obtain the functions of the amplitude and phase characteristics of each channel of the cryogenic phased array radar with respect to temperature; (2) Setting up and measuring the temperature monitoring equipment of the cryogenic phased array radar array, and recording the positions of each temperature monitor and channel on the cryogenic cold plate in two-dimensional coordinates; (3) Under the initial working conditions, the calibration signal is used to calibrate the channel consistency of the cryogenic phased array radar as a benchmark for subsequent real-time calibration compensation; (4) During the operation of the cryogenic phased array radar, the array surface temperature monitoring device is used to fit the temperature of each channel, and real-time calibration compensation is performed based on the functional relationship between the channel's amplitude and phase characteristics and temperature.

2. A channel calibration compensation method based on a cryogenic receiving array according to claim 1, characterized in that: The step (1) comprises: 1) Measurement of the relationship between channel amplitude and phase characteristics and temperature For the channel (m,n) of the low-temperature phased array, where m and n represent the mth row and nth column of the channel on the array surface, respectively, a temperature monitoring device and a temperature control device are set up close to the channel, and a calibration signal is injected. The temperature of the channel is changed by the temperature control device. At different temperatures, the channel output signal is sampled and recorded. The output signal at a certain temperature T0 is used as a reference to obtain the channel amplitude A and phase at different temperatures T. relative changes in 2) Fitting of the relationship between channel amplitude and phase characteristics and temperature function According to the result in 1), the amplitude A of channel (m,n) is fitted by interpolation method m,n and Phase As a function of temperature: A m,n =f m,n (T); All channels of the cryogenic phased array are traversed to obtain the functions of the amplitude and phase of all channels with respect to temperature.

3. A channel calibration compensation method based on a cryogenic receiving array according to claim 2, characterized in that: The step (2) comprises: 1) Install temperature monitoring equipment on the cryogenic phased array radar array Set up K temperature monitoring devices S1, ..., S1 on the low temperature front. K ; 2) Measure and record the location of temperature monitoring equipment and channels The temperature monitoring device S is measured and recorded in the form of two-dimensional coordinates (x, y) i The position (x i ,y i ), and the position (x) of channel (m,n) m,n ,y m,n ), 1≤i≤K.

4. A channel calibration compensation method based on a cryogenic receiving array according to claim 3, characterized in that: The step (3) comprises: 1) Recording of the temperature of the temperature monitoring equipment under initial working conditions The radar is fully powered on and enters cooling mode. Under stable temperature conditions, record the temperature of each temperature monitoring device S i Working temperature T under initial working conditions a,i , 1≤i≤K; 2) Measurement of channel amplitude and phase characteristics under initial working conditions Inject completely consistent calibration signals into each channel, and sample and record the channel output signals; 3) Calculation of channel amplitude and phase compensation coefficients under initial working conditions Taking a certain channel as the reference, compare the relationship between the output signal amplitude and phase of other channels and this channel, and obtain the amplitude and phase difference as the channel amplitude and phase compensation coefficient A under the initial working conditions. a,m,n and 5. A channel calibration compensation method based on a cryogenic receiving array according to claim 4, characterized in that: The step (4) comprises: 1) Recording of temperature of temperature monitoring equipment When the radar is turned on and works for a period of time, the temperature monitoring device S i Temperature T b,i ; 2) Fitting of channel temperature For channel (m,n), select the 4 temperature monitoring devices S closest to the channel t , S u , S v , S w , based on the corresponding monitoring temperature T b,t , T b,u , T b,v , T b,w , calculate its real-time temperature T b,m,n , the calculation method is: According to the two-dimensional coordinates recorded in step (2), calculate the distance between the channel (m, n) and the temperature detection device R t 2 =(x m,n -x t ) 2 +(y m,n -y t ) 2 ; R u 2 =(x m,n -x u ) 2 +(y m,n -y u ) 2 ; R v 2 =(x m,n -x v ) 2 +(y m,n -y v ) 2 ; R w 2 =(x m,n -x w ) 2 +(y m,n -y w ) 2 ; Among them, R t , R u , R v , R w They are channel (m, n) and temperature detection device S t , S u , S v , S w The distance between Calculate the real-time temperature T of channel (m,n) by weighting according to the inverse square of the distance b,m,n : According to the same method, based on the temperature monitoring device S t , S u , S v , S w Monitoring temperature T under initial operating conditions a,t 、T a,u 、T a,v 、T a,w , calculate the temperature T of channel (m,n) under initial working conditions a,m,n : 3) Calculation of real-time channel amplitude and phase compensation coefficients On the basis of the channel amplitude-phase compensation coefficient under the initial working conditions, the channel amplitude-phase characteristic change caused by temperature change is superimposed, and the channel amplitude-phase compensation coefficient is calculated in real time. The calculation method is: According to the initial working temperature T a,m,n and real-time temperature T b,m,n , and the functional relationship between the channel amplitude and phase characteristics and temperature obtained in step (1), calculate the changes in channel amplitude and phase compensation coefficients due to temperature changes: ΔA a,b,m.n =f m,n (T b,m,n )-f m,n (T a,m,n ) in, ΔA a,b,m.n is the change value of the amplitude compensation coefficient, is the change value of the phase compensation coefficient; The change values ​​of the amplitude and phase compensation coefficients are superimposed on the channel amplitude and phase compensation coefficients under the initial working conditions to obtain the real-time channel amplitude and phase compensation coefficients: IN b,m,n = Yes a,m,n +ΔA a,b,m.n Among them, A b,m,n and are the real-time compensation coefficients of amplitude and phase respectively.

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