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Device and method for linearization of synthetic aperture radar transmitter

A synthetic aperture radar and transmitter technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, radio wave measurement systems, instruments, etc., can solve problems such as influence and resolution reduction, and achieve improved linearity, small distortion, and improved resolution The effect of rate performance

Inactive Publication Date: 2012-05-02
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

[0003] The key to realizing the high resolution of synthetic aperture radar lies in the pulse compression of the radar echo signal. The decrease of the linearity of the radar system will have a direct impact on the pulse compression, resulting in a decrease in resolution.

Method used

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  • Device and method for linearization of synthetic aperture radar transmitter
  • Device and method for linearization of synthetic aperture radar transmitter
  • Device and method for linearization of synthetic aperture radar transmitter

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Embodiment Construction

[0034] The following combination Figure 1 ~ Figure 4 , a preferred embodiment of the present invention is described in detail.

[0035] Such as figure 1 Shown is the functional block diagram of the linearization device of the synthetic aperture radar transmitter provided by the present invention. The linearization device predistorts the input signal by setting a digital predistorter between the digital signal generator and the power amplifier, so that the predistortion signal processed by the digital predistorter has the nonlinear characteristics of the power amplifier In contrast to the characteristic curve, the predistortion signal is amplified nonlinearly by the power amplifier to obtain an output signal that is amplified linearly with the input signal.

[0036] Such as figure 2 As shown, the linearization device of the synthetic aperture radar transmitter provided by the present invention is connected with the power amplifier 5 of the synthetic aperture radar transmit...

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Abstract

The invention relates to a device and a method for linearization of a synthetic aperture radar transmitter. A digital predistortion device is arranged at the front end of the synthetic aperture radar transmitter system, digital signals to be transmitted are subjected to nonlinear disturbance in advance, and a distortion signal is generated; and the distortion signal is complementary with nonlinear characteristics of a power amplifier after passing through the power amplifier, so that a transmitting signal with amplified linearity is acquired. According to the device and the method, the nonlinear correction of the transmitting signal of a synthetic aperture radar can be realized, the linearity of the power amplifier of the radar transmitter is improved, the resolution performance of a synthetic aperture radar transmitter system is improved, and the synthetic aperture radar transmitter system with high linearity is realized.

Description

technical field [0001] The invention relates to a linearization device and method using digital predistortion, in particular to a linearization device and method suitable for a synthetic aperture radar transmitter, belonging to the linearization field of a synthetic aperture radar transmitter system. Background technique [0002] Described synthetic aperture radar specifically refers to: Utilize the relative motion of radar and object to synthesize the real antenna aperture with smaller size into a larger equivalent antenna aperture radar with the method of data processing, it is characterized in that it has higher resolution. Synthetic aperture radar is mainly used in aerial survey, aerial remote sensing, satellite ocean observation, space reconnaissance, radar guidance and other fields. [0003] The key to realizing the high resolution of synthetic aperture radar lies in the pulse compression of the radar echo signal. The decrease of the linearity of the radar system will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/20G01S7/282
Inventor 吕海飞韩非蔡猛
Owner SHANGHAI RADIO EQUIP RES INST
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