Signal processing method and device based on receiver fixed bistatic SAR system

Abstract

The invention discloses a signal processing method based on a receiver stationary type double-base SAR system. The signal processing method comprises the steps that signals received from a direct channel are converted to a frequency domain by a receiver in real time to be detected, the pulse time is recorded when pulse signals are detected, and pulse signals in the direct channel and an echo channel are recorded; processing results are recorded by a recording unit for subsequent image processing. The invention correspondingly discloses a signal processing device based on the receiver stationary type double-base SAR system. According to the signal processing method and device based on the receiver stationary type double-base SAR system, different transmitters (single-base SAR) can be used as a signal source, flexible and stable time synchronization is achieved, accurate phase synchronization is achieved, redesign does not need to be conducted on the receiver stationary type double-base SAR system, and therefore design cost and design complexity are reduced.

Description

technical field [0001] The present invention relates to a synthetic aperture radar (Synthetic aperture radar, SAR) technology, in particular to a signal processing method and device based on a receiver-fixed bistatic SAR system. Background technique [0002] In recent years, bistatic SAR has become a research hotspot. Compared with monostatic SAR, bistatic SAR has many advantages. It can obtain rich target information, and it is easy to achieve low cost and miniaturization. In the bistatic SAR, the receiver fixed bistatic SAR fixes the receiver on a mountain or a high building. This kind of bistatic SAR has many advantages. It can use the existing monostatic SAR to achieve bistatic Based on imaging, the receiver does not need to return the pulse signal and the signal-to-noise ratio of the pulse signal in the echo channel is greater. [0003] However, in the bistatic SAR system, there will also be problems that have never been seen in the monostatic SAR, and the biggest prob...

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Problems solved by technology

[0003] However, in the bistatic SAR system, there will also be problems that have never been seen in the monostatic SAR. The biggest problem is the synchronization problem between the receiver and the transmitter.

Although the prior art has proposed methods for synchronizing bi-base SAR systems such as using the Global Positioning System (GPS) to tame the crystal oscillator, ultra-high-precision stable crystal oscillator, and sending synchronization signals between the transmitter and the receiver, but in order to realize the above-mentioned bi-base SAR system The synchronization method needs to redesign the hardware and software of the bistatic SAR system, so the design cost and design complexity are high, and the above method cannot be applied to the bistatic SAR system formed by the transformation of the existing single-base SAR

All in all, the prior art has not yet proposed a synchronization technique that can be applied to a fixed-receiver bistatic SAR system transformed from an existing monostatic SAR

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