Active calibration equipment equivalent RCS calibration method and system

Abstract

The invention relates to an active calibration equipment equivalent RCS calibration method and system. The method comprises steps that a receiving and transmitting antenna and a passive standard calibration body of an RCS measurement system are set on an outdoor plane RCS test field; an echo signal of the passive standard calibration body is measured based on an RCS measurement system; active calibration equipment to be calibrated is set, the active calibration equipment is started to be in a working state, and an electric axis of a receiving and transmitting antenna of the active calibration equipment is aligned with a receiving and transmitting antenna of the RCS measurement system through azimuth-pitching two-dimensional adjustment; an echo signal of the active calibration device is measured based on an RCS measurement system; and in combination with the measurement distance of the RCS measurement system, an echo signal of the active calibration equipment is calibrated by using the echo signal of the passive standard calibration body to obtain an equivalent RCS value of the calibrated active calibration equipment. According to the method, the influence of factors such as the gain fixing error of the transmitting-receiving antenna and the loss of the radio frequency connection cable is eliminated, and equivalent RCS calibration precision is high.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to an active calibration device equivalent RCS calibration method and system. Background technique [0002] In the RCS measurement of external field dynamic targets such as shore-based, vehicle-mounted, ship-borne and airborne, in order to reduce environmental impact and improve calibration accuracy, active calibration equipment is often used as RCS calibration measurement means. In general, it is not necessary to consider the influence of the equivalent RCS of active calibration equipment in conventional measurements, but with the development of measurement technology, the accuracy requirements continue to increase. Accurate calibration of the equivalent RCS of active calibration equipment is an important basis for accurate measurement of external field dynamic RCS . [0003] Equivalent RCS theoretical value of active calibration equipment Where λ is the working wavelen...

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Problems solved by technology

Among the above related parameters, the calibration error of receiving and transmitting antenna gain (Gtc, Grc) is usually about 0.5dB; ) calibration error is usually about 0.2dB, and during calibration, the RF cable connection status is not exactly the same as the official working status of the active calibration equipment, and there is an RF cable connection loss error that cannot be calibrated

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