A method for realizing automatic calibration and compensation of intermediate frequency radar

Abstract

The present application relates to a kind of method for realizing intermediate frequency radar automatic calibration and compensation, and digital transceiver subsystem generates calibration signal;When receiving calibration, after equal power division, calibration signal is accessed to the analog input end of 8 receiving channels of radar system;When transmitting calibration, 8 transmitting channels of radar system are calibrated respectively, calibration signal is accessed to the transmitter excitation end of the channel to be calibrated, and a part of the signal coupled from transmitting channel analog output end is sent into receiving channel;Digital transceiver subsystem processes the calibration data received, and sends to local control software according to the agreed interface, and local control software calculates the amplitude and phase of 8 channels when receiving and transmitting calibration, and compensates the amplitude and phase of each channel when receiving and transmitting based on it.The present application realizes the amplitude and phase calibration of intermediate frequency radar receiving and transmitting channel on the basis of increasing calibration signal in intermediate frequency radar digital transceiver subsystem.

Description

Technical Field

[0001] This invention relates to the field of radar calibration technology, and in particular to a method for automatic calibration and compensation of intermediate frequency radar. Background Technology

[0002] Mid-frequency radar is a specialized instrument for detecting the middle atmosphere, primarily used to measure physical parameters of the middle atmosphere at a depth of 60–100 km, such as horizontal wind speed / direction and ionospheric electron density. Mid-frequency radar is a typical pulse radar system, operating at a mid-frequency (around 2 MHz), and employs distributed antenna technology, typically consisting of four vertically oriented transmit / receive antennas. The antennas utilize a dual-polarization design, with each antenna consisting of two vertically intersecting antenna elements. By adjusting the phase relationship of the signals between the antenna elements, linear polarization or circular polarization (left-hand or right-hand circular polarization) transmission can be achieved. During operation, the excitation signal generated by the digital transceiver subsystem is divided and phase-shifted before being sent to four transmitting components. After shaping, filtering, and amplification, eight transmitting signals are obtained and radiated through four antennas (i.e., four sets of vertically intersecting antenna elements). When the electromagnetic wave signal encounters an ionospheric inhomogeneity, it undergoes Fresnel partial reflection. The four antennas (eight antenna elements) send the received eight echo signals to the digital transceiver subsystem. After amplification, mixing, A / D sampling, filtering, and decimation, each echo signal is converted into a digital baseband signal and sent to the computer for further processing.

[0003] Maintaining the consistency of amplitude and phase across the eight transmit and receive channels of an intermediate frequency (IF) radar is crucial for radar data processing. However, since the eight transmit and receive channels operate independently, their amplitude and phase will inevitably differ over time. Therefore, in the daily operation and detection of IF radar, automatic calibration and compensation of the transmit and receive channels are of great significance for improving the radar's detection performance and data quality. Currently, however, there is no satisfactory solution to this problem. Summary of the Invention

[0004] To address the existing technical problems, this invention provides a method for automatic calibration and compensation of intermediate frequency radar.

[0005] The specific content of this invention is as follows: A method for automatic calibration and compensation of intermediate frequency radar, comprising the following steps: the digital transceiver subsystem of the intermediate frequency radar generates a calibration signal; during receiving calibration, the calibration signal is divided into equal parts and connected to the analog input terminals of the eight receiving channels of the radar system; during transmitting calibration, the eight transmitting channels of the radar system are calibrated respectively, the calibration signal is connected to the transmitter excitation terminal of the channel to be calibrated, and a portion of the signal from the analog output terminal of the transmitting channel is coupled and sent to the receiving channel; the digital transceiver subsystem processes the received calibration data and sends it to the local control software of the intermediate frequency radar according to the agreed interface; after the local control software of the intermediate frequency radar collects the calibration data sent by the digital transceiver subsystem, it calculates the amplitude and phase of the eight channels during receiving and transmitting calibration, and uses this as a basis to compensate for the amplitude and phase of each channel during receiving and transmitting.

[0006] Furthermore, during the receiving calibration, the eight signals are processed through eight receiving channels, packaged in the data fusion module, and sent to the intermediate frequency radar local control software to calculate the amplitude and phase of each channel. Using the value of the first channel as a reference, the amplitude and phase compensation values ​​of each channel are obtained, recorded, and then used for compensation during actual operation.

[0007] Furthermore, during the transmission calibration, each of the eight transmission channels is calibrated individually. The entire control process is completed by the local control software of the intermediate frequency radar. After the calibration signal is amplified, it is sent to the transceiver component. A portion of the signal is coupled back through the transmission calibration coupler and sent to the first receiving channel for reception processing. The data is packaged by the data fusion module and sent to the local control software of the intermediate frequency radar. After the transmission calibration of the eight transmission channels is completed, the local control software of the intermediate frequency radar calculates the amplitude and phase of each channel. Using the value of the first channel as a reference, the amplitude and phase compensation values ​​of each channel are obtained. After recording, compensation is performed according to this result during actual operation.

[0008] Furthermore, the local control software of the intermediate frequency radar performs radar control on a unit basis according to the detection mission, and periodically calibrates and compensates for the amplitude and phase consistency of the reception and transmission of the eight channels.

[0009] Furthermore, the detection mission content of the intermediate frequency radar includes: detection mission name, start and end time, detection cycle, automatic calibration configuration, and detection mode selection. When configuring automatic calibration, you can choose whether to enable the automatic amplitude and phase consistency calibration of the intermediate frequency radar, the calibration cycle of automatic calibration, and the execution time.

[0010] Furthermore, after the user initiates the detection task through the local control software of the intermediate frequency radar, the software manages and schedules the detection task of the intermediate frequency radar according to the detection task. First, it checks whether the user has enabled the automatic calibration function of the intermediate frequency radar. If it has been enabled, it determines whether the intermediate frequency radar calibration operation needs to be performed immediately based on the configured automatic calibration cycle, time, and the current time. If calibration is required, the receiving and transmitting calibration of the intermediate frequency radar is performed sequentially. The corresponding calibration parameters are read from the configuration file, decomposed into the working parameters of each subsystem, and sent to each subsystem for execution to start the radar calibration operation. During the calibration process, the calibration data sent back by the digital transceiver subsystem is collected and recorded. After the calibration is completed, the amplitude and phase of each of the eight channels during receiving and transmitting calibration are calculated respectively. Using the amplitude and phase of the first channel as a reference, the amplitude and phase compensation values ​​of each channel during receiving and transmitting are obtained, recorded, and then used for compensation during actual detection. After the entire automatic calibration process is completed, the local control software of the intermediate frequency radar continues to schedule the current detection task until the next detection mode is executed.

[0011] This invention adds a calibration signal to the intermediate frequency radar digital transceiver subsystem to achieve amplitude and phase calibration of the intermediate frequency radar receiving and transmitting channels. It is suitable for situations where intermediate frequency radar performs automatic calibration and compensation of the receiving and transmitting channels. Attached Figure Description

[0012] The invention will be further explained below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the intermediate frequency radar configuration of the present invention.

[0014] Figure 2 This is a schematic diagram of the intermediate frequency radar receiver calibration of the present invention.

[0015] Figure 3 This is a schematic diagram of the intermediate frequency radar transmission calibration of the present invention.

[0016] Figure 4 This is a schematic diagram illustrating the local control software's detection task editing capabilities according to the present invention.

[0017] Figure 5 This is a schematic diagram of the local control software detection task scheduling of the present invention. Detailed Implementation

[0018] This invention provides a method for automatic calibration and compensation of intermediate frequency radar, such as... Figure 1As shown, the intermediate frequency (IF) radar consists of an antenna subsystem, a transmission subsystem, a transceiver assembly, a digital transceiver subsystem, a software subsystem, and a switching switch. The switching switch is used for amplitude and phase calibration of the receiving and transmitting channels. When the IF radar is in operation, the user sets the detection task on the interface of the IF radar's local control software and starts it. The software performs comprehensive management and scheduling of radar detection according to the detection task.

[0019] During normal detection, the local control software of the intermediate frequency radar sends operating parameter instructions (including amplitude and phase compensation values ​​for the receiving and transmitting channels) to the radar control module of the digital transceiver subsystem. This module generates corresponding timing sequences according to the operating parameters, controls the radar to generate excitation signals, and sends them to eight transmitters. After amplification, the energy is radiated through the transceiver components and antenna elements. Under the radar timing control, the state of the transceiver components is switched to receiving mode. The echo signals received by the eight antenna elements enter the eight receiving channels of the digital transceiver subsystem after passing through the transceiver components. After processing, the data fusion module sends the data to the software subsystem for product generation and display operations.

[0020] like Figure 2 As shown, during the calibration of the receiving channels, the state of the switching switch is controlled to ensure that the calibration signal generated by the digital transceiver subsystem is divided into equal parts and sent to the analog input terminals of the eight receiving channels. Under the control of the radar timing signal, the receiving process proceeds normally. After the eight received data channels are processed, they are packaged in the data fusion module and sent to the intermediate frequency radar local control software to calculate the amplitude and phase of each channel. Using the value of the first channel as a reference, the amplitude and phase compensation values ​​of each channel are obtained, recorded, and used for compensation during actual operation.

[0021] During the calibration of the transmission channels, each of the eight transmission channels needs to be calibrated individually. The entire control process is completed by the local control software of the intermediate frequency radar. Figure 3 As shown, by controlling the state of the switching switch, the calibration signal generated by the digital transceiver subsystem is sent to the transmitter excitation end of the transmission channel to be calibrated. Under the control of the radar timing signal, it works according to the normal transmission process. After the calibration signal is amplified, it is sent to the transceiver component. A part of the signal is coupled back through the transmission calibration coupler and sent to the first receiving channel for reception processing. After being packaged by the data fusion module, it is sent to the local control software of the intermediate frequency radar.

[0022] After completing the transmission calibration of the eight transmission channels, the local control software of the intermediate frequency radar performs unified data processing to calculate the amplitude and phase of each channel. Similarly, using the value of the first channel as a reference, the amplitude and phase compensation values ​​received by each channel are obtained, recorded, and then used for compensation in actual operation.

[0023] like Figure 4As shown, the detection task of the intermediate frequency radar includes the following parts: detection task name, start and end time (which can be unlimited), detection cycle, automatic calibration configuration, and specific detection mode selection. When configuring automatic calibration, you can choose whether to enable automatic amplitude and phase consistency calibration of the intermediate frequency radar, as well as the calibration cycle and execution time of automatic calibration.

[0024] like Figure 5 As shown, after the user starts the detection task through the local control software of the intermediate frequency radar, the software performs comprehensive management and scheduling of the detection task of the intermediate frequency radar according to the detection task.

[0025] First, check if the user has enabled the automatic calibration function of the intermediate frequency radar. If it has, determine whether the intermediate frequency radar calibration operation needs to be performed immediately based on the configured automatic calibration cycle and time and the current time. If calibration is required, perform the intermediate frequency radar's receiving and transmitting calibrations sequentially. Read the corresponding calibration parameters from the configuration file, decompose them into the working parameters of each subsystem, and send them to each subsystem for execution to begin the radar calibration operation. During the calibration process, collect and record the calibration data sent back by the digital transceiver subsystem. After calibration, calculate the amplitude and phase of each of the eight channels during receiving and transmitting calibrations. Using the amplitude and phase of the first channel as a reference, obtain the amplitude and phase compensation values ​​for each channel during receiving and transmitting. Record these values ​​and use them for compensation during actual detection.

[0026] After the entire automatic calibration process is completed, the local control software of the intermediate frequency radar continues to schedule the current detection task until the next detection mode is executed.

[0027] This invention, based on the addition of calibration signals to the intermediate frequency (IF) radar digital transceiver subsystem, achieves amplitude and phase calibration of the IF radar's receiving and transmitting channels through a series of switch transitions. An automatic calibration option is added to the detection tasks of the IF radar's local control software to achieve periodic, automated calibration of the amplitude and phase of the IF radar's receiving and transmitting channels. This invention is specifically applicable to situations where IF radars need to automatically calibrate and compensate for their receiving and transmitting channels, and it also has certain reference value for other equipment requiring automated calibration and compensation.

[0028] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A method for automatic calibration and compensation of intermediate frequency radar, characterized in that: The digital transceiver subsystem of the intermediate frequency radar generates a calibration signal. During the receiving calibration, the calibration signal is divided into equal parts and then connected to the analog input terminals of the eight receiving channels of the radar system. During the transmitting calibration, the eight transmitting channels of the radar system are calibrated respectively. The calibration signal is connected to the transmitter excitation terminal of the channel to be calibrated, and a portion of the signal from the analog output terminal of the transmitting channel is coupled and sent to the receiving channel. The digital transceiver subsystem processes the received calibration data and sends it to the local control software of the intermediate frequency radar through the agreed interface. After the local control software of the intermediate frequency radar collects the calibration data sent by the digital transceiver subsystem, it calculates the amplitude and phase of the eight channels during the receiving and transmitting calibration, and uses this as a basis to compensate for the amplitude and phase of each channel during receiving and transmitting. The local control software of the intermediate frequency radar controls the radar on a unit basis according to the detection mission, and periodically calibrates and compensates for the amplitude and phase consistency of the reception and transmission of the eight channels; After the user initiates the detection task through the local control software of the intermediate frequency radar, the software manages and schedules the detection task of the intermediate frequency radar according to the detection task. First, it checks whether the user has enabled the automatic calibration function of the intermediate frequency radar. If it has been enabled, it determines whether the intermediate frequency radar calibration operation needs to be performed immediately based on the configured automatic calibration cycle, time and the current time. If calibration is required, the receiving and transmitting calibration of the intermediate frequency radar is performed sequentially. The corresponding calibration parameters are read from the configuration file, decomposed into the working parameters of each subsystem, and sent to each subsystem for execution to start the radar calibration operation. During the calibration process, the calibration data sent back by the digital transceiver subsystem is collected and recorded. After the calibration is completed, the amplitude and phase of each of the eight channels during receiving and transmitting calibration are calculated respectively. Using the amplitude and phase of the first channel as the reference, the amplitude and phase compensation values ​​of each channel during receiving and transmitting are obtained, recorded and used for compensation during actual detection. After the entire automatic calibration process is completed, the local control software of the intermediate frequency radar continues to schedule the current detection task until the next detection mode is executed.

2. The method for automatic calibration and compensation of intermediate frequency radar according to claim 1, characterized in that: During the receiving calibration, the eight signals are processed by eight receiving channels, packaged in the data fusion module, and sent to the intermediate frequency radar local control software to calculate the amplitude and phase of each channel. Using the value of the first channel as a reference, the amplitude and phase compensation values ​​received by each channel are obtained, recorded, and then used for compensation in actual operation.

3. The method for automatic calibration and compensation of intermediate frequency radar according to claim 2, characterized in that: During the transmission calibration, each of the eight transmission channels is calibrated individually. The entire control process is completed by the local control software of the intermediate frequency radar. After the calibration signal is amplified, it is sent to the transceiver component. A portion of the signal is coupled back through the transmission calibration coupler and sent to the first receiving channel for reception processing. The data is packaged by the data fusion module and sent to the local control software of the intermediate frequency radar. After the transmission calibration of the eight transmission channels is completed, the local control software of the intermediate frequency radar calculates the amplitude and phase of each channel. Using the value of the first channel as a reference, the amplitude and phase compensation values ​​of each channel are obtained. After recording, compensation is performed according to this result during actual operation.

4. The method for automatic calibration and compensation of intermediate frequency radar according to claim 1, characterized in that: The detection mission content of the intermediate frequency radar includes: detection mission name, start and end time, detection cycle, automatic calibration configuration and detection mode selection. When configuring automatic calibration, you can choose whether to enable the automatic amplitude and phase consistency calibration of the intermediate frequency radar, the calibration cycle of automatic calibration and the execution time.

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