Channel equalization method for non-uniform scenes in two-dimensional frequency domain
A non-uniform scene, two-dimensional frequency domain technology, applied in the field of data processing, can solve problems such as unsatisfactory clutter suppression effect, and achieve the effect of self-adaptive, easy to implement, and improved coherence
Active Publication Date: 2016-03-02
XIDIAN UNIV
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The measured data processing results show that: in a uniform scene, the clutter suppression effect is better after channel equalization using this method, but the clutter suppression effect is better after channel equalization using this method in a non-uniform scene with many man-made buildings. not ideal
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[0029] Reference figure 1 , The implementation steps of the present invention are as follows:
[0030] Step 1. Select the channel for obtaining radar echo data.
[0031] 1a) Use each aperture of the multi-aperture synthetic aperture radar as a separate channel for moving target detection to receive radar echo data;
[0032] 1b) Choose two of the channels from the corresponding channels of the multi-aperture synthetic aperture radar and mark them as channel 1 and channel 2.
[0033] Step 2: Convert the radar echo data of channel 1 and channel 2 from the two-dimensional time domain to the two-dimensional frequency domain.
[0034] 2a) Perform range compression and range migration correction on the radar echo data obtained in channel 1 in order to obtain the two-dimensional time domain data of channel 1 after range migration correction;
[0035] 2b) Perform a two-dimensional fast Fourier transform on the two-dimensional time domain data after distance migration correction of channel 1, so ...
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The invention discloses a method for balancing channels of a non-uniform scene in a two-dimensional frequency domain. The method mainly solves the problems that after channels are balanced through an existing method, the coherence between the channels is poor, and the clutter rejection effect is bad. The method comprises the first step of selecting two channels for acquiring radar return data, the second step of converting the radar return data of the channel 1 and the radar return data of the channel 2 into a two-dimensional frequency domain from a two-dimensional time domain, the third step of regarding the channel 1 as a reference channel and compensating the channel 2 according to a distance frequency, the fourth step of carrying out secondary compensating on the channel 2 according to the Doppler frequency, the fifth step of regarding the channel 2 compensated in the Doppler frequency as a reference channel and compensating the channel 1 according to the distance frequency, the sixth step of carrying out secondary compensating on the channel 1 according to the Doppler frequency, and the seventh step of repeating the third step to the sixth step to balance the two channels. Channel balancing is carried out by exchanging the reference channels, the coherence and consistency between the channels are effectively improved, and the clutter rejection ration is improved.
Description
Technical field [0001] The invention belongs to the technical field of data processing, and in particular relates to a channel equalization method, which can be used to improve the correlation and consistency between channels, so as to better suppress the clutter in the synthetic aperture radar SAR image. Background technique [0002] The concept of "synthetic aperture" is proposed for fixed scenes. For a fixed scene that does not change with time, install the radar on a platform flying straight at a constant speed, and periodically transmit and receive signals. The received signal is a broadband signal, which can be processed to obtain a high-resolution two-dimensional image. With the promotion of synthetic aperture radar applications, sometimes it is not only required to image fixed scenes, but also to understand the situation of ground moving targets in the scenes. Such requirements are often put forward in traffic control systems and military systems. The basic principle of ...
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IPC IPC(8): G01S7/36
CPCG01S7/415G01S13/90G01S13/9029
Inventor 王彤申风阳刘保昌刘东东吕晓雷
Owner XIDIAN UNIV