Method for calibrating near-field effect of spherical composite array in radio frequency simulation system

Abstract

This invention discloses a method for calibrating near-field effect of a spherical composite array in a radio frequency simulation system, and relates to the technical field of instrument calibration. The spherical composite array is composed of micro wave and millimeter wave antenna arrays so as to generate electromagnetic wave signals of micro wave and millimeter wave frequency bands. The calibrating method comprises the steps of precisely calculating an electric field distribution near the position of a receiving antenna (normally located at a radiation near field of a transmitting triple antenna) by a full-wave algorithm and a high-frequency algorithm when a given subarray (triple) antenna in the composite array is transmitted in a surrounding environment of same-frequency and different-frequency antenna element; based on phase distribution of an electric field, determining an equivalent phase center of a triple radiation field by a phase gradient algorithm, and calculating a deviation between the equivalent phase center and an equivalent phase center estimated value acquired based on a gravity equation; and calibrating the input power ratio of each unit of the triple according to the deviation value. The method can be used for making a calibrating table, so as to quickly calibrate the near-field effect of the composite array in real time during engineering.

Description

technical field [0001] The invention belongs to the technical field of instrument equipment calibration, and relates to a calibration method for the near-field effect of a spherical composite array in a radio frequency simulation system. Background technique [0002] The radio frequency hardware-in-the-loop simulation system plays an irreplaceable role in the performance evaluation of the missile guidance system, system parameter debugging and verification, flight test result prediction and fault recurrence, etc. It can not only effectively shorten the missile development cycle, but also greatly save scientific research funds. Hardware-in-the-loop simulation can solve the problems that some parts in mathematical simulation are not easy to model and the cost of physical simulation is high, and the structure is difficult to modify in radar system simulation. The semi-physical radio frequency simulation system generally includes the following six parts: electromagnetic wave ane...

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Problems solved by technology

Due to the high cost of the electromagnetic wave anechoic chamber and simulation test system, usually the hardware-in-the-loop simulation system cannot meet the "far-field conditions" required for the test, and the system to be tested generally works in the "near-field radiation" area of ​​the triplet. , it is necessary to effectively correct the near-field effect of the simulation system; as the application development requires, the test requires that the RF hardware-in-the-loop simulation system can provide a more complex electromagnetic environment, and realize the target signal of multiple frequency bands on the same transmitting antenna array. The spherical compound array has also been proposed, and the correction method for the near-field effect of a single array cannot meet the correction accuracy of the near-field effect of the spherical compound array

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