Synchronization calibration device and synchronization calibration and error compensation method for multi-channel receiver

Abstract

The invention discloses a synchronization calibration and error compensation method for a multi-channel receiver. The method comprises the following steps: a system is switched to a synchronization calibration mode; a power division network divides a standard dot frequency signal output by a synchronization calibration signal source into multiple paths of signals, wherein the number of paths corresponds to that of channels; a switching matrix outputs the multiple paths of signals to a multi-channel A / D (analogue / digital) unit; a synchronization error compensation unit analyzes the digitalized calibrating signals from the multi-channel A / D unit, and performs synchronization calibration and error compensation on each channel; after compensation is finished, the system is switched to a normal working mode, and the receiver enters a radar echo signal receiving state. The invention also discloses a synchronization calibration device for the multi-channel receiver. Through the adoption of the scheme, the error calibration is high in automation degree, the real-time performance is strong, the processing speed is high, an error calibration process is easy to operate, any connection and hardware modification are avoided, and difficulty in the reception of a broadband signal can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a multi-channel receiver synchronous calibration device and a synchronous calibration and error compensation method. Background technique [0002] Because synthetic aperture radar (SAR) can image the ground all day and all day long, and has the ability to penetrate vegetation and camouflage, it is widely used in military reconnaissance, disaster monitoring, resource exploration, terrain surveying and other fields, and is favored by the world. Countries are paying more and more attention. With the continuous development of synthetic aperture radar technology and the continuous expansion of application fields, the requirements for radar performance are getting higher and higher, and the resolution, as one of the core technical indicators of synthetic aperture radar, has been raised to a higher position. [0003] The improvement of distance resolution depends on the impro...

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Problems solved by technology

[0008] In view of this, the main purpose of the present invention is to provide a multi-channel receiver synchronous calibration device and calibration and error compensation method, to the main error component of the multi-channel received signal - synchronization error, using the calibration method to compensate the system working time Time inconsistency problem between multiple channels

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