Pulse Doppler radar system and its signal processing method

A pulsed Doppler and signal processing technology, used in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc. The effect of coherent accumulation time and reducing false alarm rate

Inactive Publication Date: 2009-07-01
TSINGHUA UNIV
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Problems solved by technology

[0005] In order to overcome the defect of poor detection performance in pulse Doppler radar sequence PRF stagger proc

Method used

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  • Pulse Doppler radar system and its signal processing method
  • Pulse Doppler radar system and its signal processing method
  • Pulse Doppler radar system and its signal processing method

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] figure 1 It shows the signal processing flow of the pulse Doppler radar system in the prior art. The existing pulse Doppler radar system transmits a specific detection signal to the detection area through a single transmitter and an antenna feeder system, and the signal has a Given PRF. The pulse Doppler radar system receives the echo signal from the detection area through the antenna feed system and the receiver, and the echo signal includes target, clutter signal and system noise. Pulse Doppler radar sends the received signals corresponding to different detection signals to the signal processing system after mixing and A / D conversion respectively. The signal processing system respectively performs target detection processing on a group of echoes in corresponding coherent processing intervals corresponding to different detec...

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Abstract

The invention discloses a pulse Doppler radar system based on multiple detection signals and a signal processing method. The pulse Doppler radar system comprises a plurality of transmitters, wherein each transmitter respectively transmits orthogonal pulse detection signals synchronously at different pulse repetition frequencies (PRF), and the PRF of different detection signals meet stagger relationship, the receiving system of airborne radar is composed of a receiver or a plurality of receivers. The signal processing method processes the echo corresponding to different transmission signals via target detection, to obtain respective target detection results. The interference accumulation time of the pulse Doppler radar can be significantly prolonged under single PRF, thereby improving target detection performance. The invention utilizes the stagger relationship among different PRF, to process ambiguity resolution treatment on the detection result having distance and Doppler ambiguity under different PRF, to obtain correct target distance and Doppler information.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, and more specifically, the invention relates to a pulse Doppler radar system and a signal processing method thereof. Background technique [0002] Pulse Doppler radar, such as airborne radar, new land-based radar and ship-borne radar, has excellent characteristics such as all-weather, all-weather, and strong penetration. It has a wide range of applications in civilian or military fields. However, there are many technical difficulties in pulse Doppler radar signal processing, including: how to effectively suppress strong clutter and how to realize target detection and parameter estimation on moving platforms such as airborne or shipborne. [0003] For example, the received signal of airborne radar usually includes target signal, clutter signal and noise signal. On the one hand, because the airborne radar is usually in the down-looking mode, the ground clutter is widely distribute...

Claims

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Application Information

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IPC IPC(8): G01S13/06G01S13/50G01S7/292
Inventor 许稼戴喜增彭应宁王永良
Owner TSINGHUA UNIV
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