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CN-122017372-A - Phased array antenna rapid calibration test system based on full closed loop hardware triggering

CN122017372ACN 122017372 ACN122017372 ACN 122017372ACN-122017372-A

Abstract

The invention discloses a phased array antenna rapid calibration test system based on full-closed loop hardware triggering, which relates to the technical field of antennas and comprises a main control industrial personal computer, an FPGA hardware triggering controller, a vector network analyzer VNA, a DAC signal generator, a six-axis precision mechanical arm, a microwave probe arranged on the six-axis precision mechanical arm, a high-precision double-shaft turntable and a phased array antenna to be tested arranged on the high-precision double-shaft turntable, wherein the FPGA hardware triggering controller is connected with the main control industrial personal computer, the vector network analyzer VNA, the DAC signal generator, the six-axis precision mechanical arm and the high-precision double-shaft turntable through special hardware triggering buses respectively, so that multi-equipment nanosecond synchronous triggering and real-time closed loop calibration are realized, triggering delay and synchronous errors are greatly reduced, and thus, the test precision and efficiency are remarkably improved, and inherent defects of a traditional software triggering method are effectively overcome.

Inventors

  • GUO CHENGJUN

Assignees

  • 电子科技大学

Dates

Publication Date
20260512
Application Date
20260227

Claims (8)

  1. 1. The phased array antenna rapid calibration test system based on full closed loop hardware triggering is characterized by comprising a main control industrial personal computer, an FPGA hardware triggering controller, a vector network analyzer VNA, a DAC signal generator, a six-axis precision mechanical arm, a microwave probe arranged on the six-axis precision mechanical arm, a high-precision double-shaft turntable and a phased array antenna to be tested arranged on the high-precision double-shaft turntable, wherein the FPGA hardware triggering controller is connected with the main control industrial personal computer, the vector network analyzer VNA, the DAC signal generator, the six-axis precision mechanical arm and the high-precision double-shaft turntable through special hardware triggering buses respectively.
  2. 2. The phased array antenna rapid calibration test system based on full closed loop hardware triggering of claim 1, wherein the main control industrial personal computer is configured to perform an initialization test task and receive test data via an independent communication link, load a test task package, the test task package specifically comprising a test angle sequence List of excitation frequencies And triggering a timing configuration table, wherein, A serial number indicating the angle of the test, Indicating the total number of test angles, Representing the pitch angle of the light, And representing azimuth angles, and pre-storing a trigger time sequence configuration table in a RAM of the FPGA hardware trigger controller.
  3. 3. The phased array antenna rapid calibration test system based on full closed loop hardware triggering of claim 1, wherein the FPGA hardware triggering controller is configured to construct a full closed loop hardware triggering link or perform closed loop verification and retry.
  4. 4. The rapid calibration test system for the phased array antenna based on the full closed loop hardware trigger according to claim 1, wherein when the FPGA hardware trigger controller is used for constructing the full closed loop hardware trigger link, a global rising edge trigger StartPulse is generated, the rising edge trigger StartPulse is subjected to shunt triggering, the rising edge trigger StartPulse is transmitted to the vector network analyzer VNA through a delay compensation module of the FPGA hardware trigger controller, the rising edge trigger StartPulse is transmitted to a controller of the six-axis precision mechanical arm through a frequency divider of the FPGA hardware trigger controller, the rising edge trigger StartPulse is transmitted to the DAC signal generator, and the rising edge trigger StartPulse is transmitted to a controller of the high-precision biaxial turntable.
  5. 5. The rapid calibration test system of a phased array antenna based on full closed loop hardware triggering of claim 1, wherein the FPGA hardware triggering controller performs closed loop verification and retry through a built-in data feedback verification module, specifically comprising the following steps: Step 1, respectively monitoring Done feedback of a six-axis precision mechanical arm, a high-precision double-axis turntable, a DAC signal generator and a vector network analyzer VNA, triggering retry logic by an FPGA hardware trigger controller if any equipment does not respond within timeout time, and triggering the retry logic for not more than 3 times, otherwise, corresponding to a test position Marking as abnormal, and recording to a log; Step 2, synchronous precision verification of the six-axis precision mechanical arm, the high-precision double-axis turntable, the DAC signal generator and the VNA of the vector network analyzer is carried out, wherein a synchronous precision verification formula is specifically set as follows: ; Wherein, the Representing the actual measured synchronization time difference, Representing the maximum synchronization time difference allowed by the system and the maximum synchronization time difference allowed by the system The value range of (2) is set to be 10ns-1us; step 3, summarizing all the test positions Is used for constructing a beam pointing error matrix And directing the beam to an error matrix Output is a calibration lookup table LUT, a fast calibration database is generated, and a beam pointing error matrix Is expressed in pitch angle of Azimuth angle of The working frequency is Under test conditions of (a) the error value between the actual beam pointing and the ideal beam pointing of the phased array antenna to be tested.
  6. 6. The rapid calibration test system for phased array antenna based on full closed loop hardware triggering as claimed in claim 1, wherein the six-axis precision mechanical arm, the high-precision double-axis turntable, the DAC signal generator and the vector network analyzer VNA are used for synchronously executing data acquisition, and the six-axis precision mechanical arm moves the microwave probe to the test position after the FPGA hardware triggering controller starts triggering The high-precision double-shaft turntable synchronously adjusts the gesture, the DAC signal generator outputs a specific excitation signal, the specific excitation signal is specifically set to be a linear frequency modulation pulse, and the vector network analyzer VNA acquires S parameters and phase information in an accurate time window.
  7. 7. The phased array antenna rapid calibration test system based on full closed loop hardware triggering of claim 1, wherein the trigger delay model of the FPGA hardware trigger controller is specifically set as follows: ; ; ; Wherein, the Representing the software scheduling delay of the time-out, Indicating a bus transfer delay and, Representing hardware triggered propagation delay.
  8. 8. The phased array antenna rapid calibration test system based on full closed loop hardware triggering of claim 1, wherein the test efficiency gain model of the FPGA hardware triggering controller is specifically set as follows: ; Wherein, the Indicating that the open loop is time consuming, Indicating that the full closed loop hardware trigger is time consuming, Representing the software scheduling and trigger delay time required to complete a single point test, Representing the hardware trigger and synchronization time required to complete a single point test, Indicating the time of physical operation of the device, Representing a single point test efficiency gain.

Description

Phased array antenna rapid calibration test system based on full closed loop hardware triggering Technical Field The invention relates to the technical field of antennas, in particular to a phased array antenna rapid calibration test system based on full-closed loop hardware triggering. Background The rapid calibration test of the phased array antenna has important significance for guaranteeing the beam pointing precision and stability of the phased array antenna in high-performance systems such as hypersonic missile seekers and the like. In the prior art, a multi-device cooperative test method based on software triggering is mainly adopted, instructions are issued through an industrial personal computer to schedule each test device to be sequentially executed, firstly, software triggering delay is large, the instructions are required to be scheduled through an operating system and responded through devices, triggering delay is up to millisecond level, the delay seriously affects system instantaneity and test efficiency in high-speed test, secondly, time offset exists among devices such as a mechanical arm, a vector network analyzer and a DAC (digital-to-analog converter), the missynchronization can cause mismatching of data acquisition time, measurement errors are introduced, besides, the test efficiency is low, single-point test time consumption is long, the engineering batch test requirement of a large-scale antenna array is difficult to meet, the serial execution mode further limits the overall test speed, finally, the measurement signal-to-noise ratio is reduced, and the synchronization errors can cause phase jitter to influence high-precision measurement of small-angle pointing precision, and the problem is particularly remarkable in a complex electromagnetic environment. Therefore, a phased array antenna rapid calibration test system based on full closed loop hardware triggering is provided to solve the above problems. Disclosure of Invention The invention aims to provide a phased array antenna rapid calibration test system based on full-closed loop hardware triggering, which realizes ultra-high precision time synchronization and extremely-low delay triggering among multiple devices through the full-closed loop hardware triggering so as to solve the problems of large software triggering delay, poor synchronism and low efficiency in the existing phased array antenna calibration test. The invention provides a phased array antenna quick calibration test system based on full-closed loop hardware triggering, which comprises a main control industrial personal computer, an FPGA hardware triggering controller, a vector network analyzer VNA, a DAC signal generator, a six-axis precision mechanical arm, a microwave probe arranged on the six-axis precision mechanical arm, a high-precision double-shaft turntable and a phased array antenna to be tested arranged on the high-precision double-shaft turntable, wherein the FPGA hardware triggering controller is respectively connected with the main control industrial personal computer, the vector network analyzer VNA, the DAC signal generator, the six-axis precision mechanical arm and the high-precision double-shaft turntable through special hardware triggering buses. Preferably, the main control industrial personal computer is used for executing an initialization test task and receiving test data through an independent communication link, loading a test task packet, wherein the test task packet specifically comprises a test angle sequenceList of excitation frequenciesAnd triggering a timing configuration table, wherein,A serial number indicating the angle of the test,Indicating the total number of test angles,Representing the pitch angle of the light,And representing azimuth angles, and pre-storing a trigger time sequence configuration table in a RAM of the FPGA hardware trigger controller. Preferably, the FPGA hardware trigger controller is used for constructing a full closed-loop hardware trigger link or executing closed-loop verification and retry. Preferably, when the FPGA hardware trigger controller is used to construct the full closed loop hardware trigger link, a global rising edge trigger StartPulse is generated, and the rising edge trigger StartPulse is triggered in a branching manner, the rising edge trigger StartPulse is transmitted to the VNA of the vector network analyzer through the delay compensation module of the FPGA hardware trigger controller, the rising edge trigger StartPulse is transmitted to the controller of the six-axis precision mechanical arm through the frequency divider of the FPGA hardware trigger controller, the rising edge trigger StartPulse is transmitted to the DAC signal generator, and the rising edge trigger StartPulse is transmitted to the controller of the high-precision dual-axis turntable. Preferably, the FPGA hardware trigger controller executes closed loop verification and retry through a built-in data feedback verification mod