A method for receiving multi-channel phase fast calibration compensation

Abstract

The application relates to the technical field of data processing, and discloses a receiving multi-channel phase fast calibration compensation method, which comprises the following steps: sending original sampled data into a digital down-conversion module, sending filtered data into a peak value searching module, calculating a signal phase, calculating corresponding sine and cosine values, and outputting calibrated data after the down-converted data are multiplied with the sine and cosine values calculated in step S4 through a phase compensation module; the receiving multi-channel phase fast calibration compensation method can perform real-time phase calibration compensation, can perform phase calibration compensation on multiple different frequency points respectively, and greatly improves the calibration precision and the calibrated performance; the method can enable a large phased array system to be quickly deployed, greatly saves the time spent in calibrating the phase, can also reduce the uncertainty caused by human measurement errors, and greatly improves the stability of the system.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, specifically to a method for rapid phase calibration and compensation of receiving multi-channel phase. Background Technology

[0002] Phased array radar is one of the most fundamental and important new types of radar in modern times. It features high precision, multi-target capability, and multi-functionality. However, its system is extremely complex, and developing and applying it to the modern military field with actual hardware is highly challenging and costly. Radar simulation systems based on computer simulation technology offer advantages such as low cost, short development cycle, and high efficiency. Furthermore, they can approximate real-world environments as closely as possible through digital simulation, making them an important tool for algorithm verification, optimization, and evaluation of radar systems.

[0003] With the development of digital phased array technology, a single digital phased array system contains anywhere from dozens to tens of thousands of receiving channels. Digital phased array systems require phase consistency between receiving channels. However, during system design, it is difficult to guarantee phase consistency between receiving channels. The traditional method is to compensate by measuring the phase difference of each channel. With the continuous development of digital phased array technology, the number of channels increases exponentially, and system aging after a period of operation necessitates recalibration of the compensation data. This method introduces measurement errors and consumes a significant amount of time and manpower, making it difficult to meet the needs of large-scale phased arrays. Therefore, we propose a rapid phase calibration and compensation method for multiple receiving channels. Summary of the Invention

[0004] The purpose of this invention is to provide a fast phase calibration and compensation method for receiving multiple channels, in order to solve the problem that the number of channels increases exponentially and the system ages after a period of operation, requiring recalibration of the compensation data. This method introduces measurement errors and consumes a lot of time and manpower, which is difficult to meet the needs of large phased arrays.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for fast phase calibration and compensation of multiple receiving channels, comprising the following steps:

[0006] Step S1: The sampled raw data is sent to the digital downconversion module. The digital downconversion module performs complex multiplication of the raw sampled signal and its own generated DDS signal and then sends the data to the filterable module for filtering. The filtered data is then output.

[0007] Step S2: Send the filtered data into the peak search module, wait for the start command to be received, and then perform FFT transformation to obtain the real and imaginary parts of the peak position in the FFT result.

[0008] Step S3: Input the calculated real and imaginary part values ​​into the phase calculation module to obtain the signal phase;

[0009] Step S4: Based on the calculated phase value, obtain the corresponding sine and cosine values ​​and store them;

[0010] Step S5: After the down-converted data is processed by the phase compensation module, the sine and cosine values ​​calculated in step S4 are multiplied together to output the calibrated data.

[0011] Optionally, the control calibration interface sends the calibration frequency, and the digital down-conversion module calculates the data using the following formula: y(n)=x(n)e j2πfcn The x(n) is the input intermediate frequency signal, and the e j2πfcn This is the down-conversion local oscillator frequency signal.

[0012] Optionally, the calculation formula for the peak search module is as follows: f (n) =f (in) *n / f s The f (n) f represents the peak position of the input intermediate frequency signal. (in) The frequency signal after down-conversion, where n is the number of FFT transform points, and f... s The sampling rate is [value].

[0013] Optionally, the phase calculation module calculates the signal phase using the following formula: phase = angle(f (n) ), where phase is the calculated signal phase, and f (n) The peak value is the signal peak value, and the angle is the angle calculation formula.

[0014] Optionally, the calculated sine compensation value and cosine compensation value are as follows: sinout = -0.5 * j * (e jθ -e -jθ ), cosout = 0.5 * (e jθ +e -jθ ), where θ is the calculated signal phase, sinout is the corresponding sine compensation value, and cosout is the corresponding cosine compensation value.

[0015] Optionally, the down-converted data is processed by multiplying the sine and cosine compensation values ​​calculated in step S4 using the phase compensation module, and then the calibrated data is output. The phase compensation algorithm is shown in the following formula:

[0016] I y(n) = I*cosout + Q*sinout

[0017] Q y(n)=Q*cosout - I*sinout

[0018] Optionally, the I y(n) To compensate for the real part of the signal, the Q... y(n) For the compensated imaginary part of the signal, I is the real part of the signal to be compensated, Q is the imaginary part of the signal to be compensated, sinout is the sine compensation value, and cosout is the cosine compensation value x.

[0019] Compared with the prior art, the present invention provides a fast phase calibration and compensation method for receiving multi-channel phase, which has the following beneficial effects:

[0020] 1. This multi-channel phase fast calibration and compensation method can perform real-time phase calibration and compensation, and can perform phase calibration and compensation for multiple different frequency points separately, greatly improving the accuracy and performance after calibration; it enables the rapid deployment of large phased array systems, greatly saving the time spent on phase calibration, and also reducing the uncertainty caused by human measurement errors, thus greatly improving the stability of the system.

[0021] 2. This fast phase calibration and compensation method for receiving multiple channels can greatly save the development and testing time of phased array systems and significantly reduce the deployment cost of phased array systems; it is applicable to large-scale digital phased array systems and can also be applied to other receiving communication systems that require multi-channel phase synchronization. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the principle structure of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the present invention provides a technical solution: a method for fast phase calibration and compensation of multiple receiving channels, comprising the following steps:

[0025] Step S1: Send the calibration frequency through the control calibration interface, then configure and select the corresponding calibration frequency point. Send the sampled calibration data to the digital down-conversion module. The digital down-conversion module performs complex multiplication of the original sampled signal and the DDS signal generated by its own NCO, and then sends it to the filterable module for filtering. Output the filtered data, and send the calibration frequency through the control calibration interface. The digital down-conversion module calculates the data using the following formula:

[0026] y(n)=x(n)e j2πfcn (1)

[0027] In formula (1), x(n) is the input intermediate frequency signal, e j2πfcn The down-conversion local oscillator frequency signal;

[0028] Step S2: The filtered data is sent to the peak search module. After receiving the search start command, an N-point FFT transformation is performed. Based on the transformed result, the real and imaginary parts of the peak position in the FFT result are calculated. The calculation formula of the peak search module is shown in the following formula:

[0029] f (n) =f (in) *n / f s (2)

[0030] In formula (2) f (n) f represents the peak position of the input intermediate frequency signal. (in) Here, n is the frequency signal after down-conversion, and f is the number of FFT transform points. s Sampling rate;

[0031] Step S3: Input the calculated real and imaginary part values ​​into the phase calculation module, and use the angle calculation formula to obtain the signal phase. The formula for obtaining the signal phase by the phase calculation module is shown below:

[0032] phase = angle(f (n) (3)

[0033] In formula (3), phase is the calculated signal phase, f (n) The peak value is the signal peak value, and angle is the angle calculation formula.

[0034] Step S4: Based on the calculated signal phase value, calculate the corresponding sine compensation value and cosine compensation value, and store them. The calculation of the corresponding sine compensation value and cosine compensation value is as follows:

[0035] sinout = -0.5 * j * (e jθ -e -jθ ), cosout = 0.5 * (e jθ +e -jθ(4)

[0036] In formula (4), θ is the calculated signal phase, sinout is the corresponding sine compensation value, and cosout is the corresponding cosine compensation value;

[0037] Step S5: The down-converted data is processed by multiplying the sine and cosine values ​​calculated in step S4 using the phase compensation module, and then the calibrated data is output. The down-converted data is processed by multiplying the sine and cosine compensation values ​​calculated in step 4 using the phase compensation module, and then the calibrated data is output. The phase compensation algorithm is shown in the following formula:

[0038] I y(n) = I*cosout + Q*sinout (5)

[0039] Q y(n) =Q*cosout - I*sinout (6)

[0040] In formulas (5) and (6), I y(n) To compensate for the real part of the signal, Q y(n) For the compensated imaginary part of the signal, I is the real part of the signal to be compensated, Q is the imaginary part of the signal to be compensated, sinout is the sine compensation value, and cosout is the cosine compensation value.

[0041] The above method enables real-time phase calibration and compensation, and allows for phase calibration and compensation at multiple different frequency points, greatly improving the accuracy and performance after calibration. It also enables the rapid deployment of large phased array systems, significantly saving the time spent on phase calibration, and reducing the uncertainty caused by human measurement errors, thus greatly improving the stability of the system.

[0042] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for rapid phase calibration and compensation of receiving multi-channel receivers, characterized in that: Includes the following steps: Step S1: Send the calibration frequency through the control calibration interface, then configure and select the corresponding calibration frequency point. Send the sampled raw data to the digital down-conversion module. The digital down-conversion module performs complex multiplication of the raw sampled signal and its own generated DDS signal, and then sends the result to the filterable module for filtering. The filtered data is then output. The calculation formula for the data by the digital down-conversion module is shown in the following formula: In the formula, The input intermediate frequency signal, The down-conversion local oscillator frequency signal; Step S2: Send the filtered data into the peak search module, wait for the start command to be received, and then perform FFT transformation to obtain the real and imaginary parts of the peak position in the FFT result. Step S3: Input the calculated real and imaginary part values ​​into the phase calculation module to obtain the signal phase; Step S4: Based on the calculated phase value, obtain the corresponding sine and cosine values ​​and store them; Step S5: After the down-converted data is processed by the phase compensation module, the sine and cosine values ​​calculated in step S4 are multiplied together to output the calibrated data; The corresponding sine and cosine compensation values ​​are calculated as follows: The For calculating the signal phase, the For the corresponding sine compensation value, the This is the corresponding cosine compensation value.

2. The method for rapid phase calibration and compensation of receiving multi-channel receivers according to claim 1, characterized in that: The calculation formula for the peak search module is as follows: The The peak position of the input intermediate frequency signal, the The frequency signal after down-conversion, the The number of FFT transform points, the The sampling rate is [value].

3. The method for fast phase calibration and compensation of receiving multi-channel receivers according to claim 1, characterized in that: The formula used by the phase calculation module to determine the signal phase is as follows: The For calculating the signal phase, the For the signal peak value, the Here is the formula for calculating angles.

4. The method for fast phase calibration and compensation of receiving multi-channel receivers according to claim 1, characterized in that: The down-converted data is processed by multiplying the sine and cosine compensation values ​​calculated in step S4 using the phase compensation module, and then the calibrated data is output. The phase compensation algorithm is shown in the following formula: 。 5. The method for rapid phase calibration and compensation of receiving multi-channel receivers according to claim 4, characterized in that: The To compensate for the real part of the signal, the To compensate for the imaginary part of the signal, the For the real part of the signal to be compensated, the For the imaginary part of the signal to be compensated, the The sine compensation value, the This is the cosine compensation value.

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