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Radar signal source system of frequency stepping system

A technology of radar signal and frequency stepping, which is applied in the field of radar to achieve the effect of reducing the output signal bandwidth, avoiding many strays, and facilitating frequency adjustment

Inactive Publication Date: 2018-07-31
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, compared with the above two solutions, the bandwidth will not change after mixing, and the mixer introduces unnecessary frequency components. It is necessary to design and optimize the input signal of the mixer to ensure that the spurious components can be filtered out.

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Embodiment Construction

[0043] The present disclosure provides a frequency stepping radar signal source system. In the present invention, a direct digital frequency synthesizer is first used to generate the step frequency baseband sub-signal. Here, the frequency interval (1MHz-10MHz) and pulse duration (0.5us-5us) can be adjusted according to actual needs, and then through The signal conditioning circuit composed of a mixer, a local oscillator, a high-speed switch and a filter adjusts the center frequency and bandwidth of the step frequency baseband sub-signal successively twice. Finally, an ultra-wideband step frequency signal is obtained, and the frequency can be quickly switched. In actual use, it can be used as a frequency stepping radar transmitter to transmit signals.

[0044] In order to make the objectives, technical solutions, and advantages of the present disclosure clearer, the following further describes the present disclosure in detail with reference to specific embodiments and drawings.

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Abstract

The invention provides a radar signal source system of a frequency stepping system, and the system comprises a step frequency baseband subsignal circuit which outputs a step frequency baseband subsignal B1; a first-stage signal conditioning circuit which outputs a step frequency signal B4; a second-stage signal conditioning circuit which carries out the frequency mixing with the step frequency signal B4 in a frequency mixer, successively adjusts the central frequency and bandwidth of the step frequency baseband subsignal, and obtains a UWB (ultra wide band) step frequency signal with the bandwidth B. The first-stage signal conditioning circuit and the second-stage signal conditioning circuit respectively comprise a frequency mixer, a local oscillator, a high-speed switch, and a filter. Through the successive adjustment of the central frequency and bandwidth of the step frequency baseband subsignal, the UWB step frequency signal is obtained, and the system can achieve the quick switching of the frequency.

Description

Technical field [0001] The present disclosure relates to the field of radar technology, and in particular to a frequency stepped radar signal source system. Background technique [0002] With the development of modern radar technology, the function of simple measurement of target distance possessed by traditional radar is far from meeting actual needs. How to perform high-resolution imaging of the target, and then realize the detection and identification of the target has become an important direction of radar technology research. According to the basic principles of radar, high range resolution needs to be obtained by transmitting large broadband signals. As a high-resolution signal with a large time-bandwidth product, the frequency stepped signal can synthesize a larger working bandwidth with a smaller instantaneous bandwidth, which reduces the requirements for system hardware while improving the range resolution. [0003] In 1999, the Stanford Research Institute in the United ...

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Application Information

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IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 张群英刘晓飞叶盛波刘小军方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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