Swept Frequency Sources and UAV Systems for mmWave Radar
A technology of millimeter wave radar and frequency sweep source, applied in the field of frequency sweep source, can solve the problems of inappropriate circuit and large circuit area, and achieve the effect of reducing circuit area and configuration cost
Active Publication Date: 2022-06-24
北京望远四象科技有限公司
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But in this case a total of three local oscillators are required, such as figure 1 as shown, figure 1 It is a schematic structural composition diagram of an embodiment of an existing frequency sweep source; figure 1 The scheme shown uses three local oscillators, that is, PLL 1 is the first frequency conversion local oscillator, PLL 2 is the second frequency conversion LO, and PLL 3 is the DDS input sampling frequency; therefore, the figure 1 This scheme corresponds to a large circuit area. For the use of millimeter-wave and low, small, and slow radars, such a large-area circuit is obviously not suitable
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[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.
[0029] The invention provides a frequency sweep source for millimeter wave radar, which can realize the required performance index of the frequency sweep source by using a phase-locked loop, and figure 1 Compared with the solutions described in the embodiments, the frequency sweep source provided by the present invention reduces the circuit area by at least half, and also reduces the equipment cost of the frequency sweep source.
[0030] The basic principle of the frequency sweep source is as follows: the fixed frequency phase-locked loop is mixed with the DDS waveform generator to generate a frequency-modulated signal, and then the phase-locked loop is frequency multiplied to ge...
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The invention discloses a frequency sweeping source for millimeter wave radar and an unmanned aerial vehicle system. The output end of the crystal oscillator in the frequency sweeping source is connected to the input end of a phase-locked loop, and the output end of the phase-locked loop is connected to the input end of the phase-locked loop respectively. The input terminals of the frequency multiplier, the first filter and the DDS are connected, the output terminals of the frequency multiplier are connected with the input terminals of the second filter, and the output terminals of the first filter and the DDS are connected with the input terminals of the first mixer ; The output end of the first mixer is connected with the input end of the third filter, and the output end of the third filter is connected with the input end of the first power amplifier; The output end of the second filter and the first power amplifier is connected with the first power amplifier The input end of the second mixer is connected, the output end of the second mixer is connected with the input end of the second power amplifier, the output end of the second power amplifier is connected with the input end of the fourth filter, the output of the fourth filter The end outputs the millimeter-wave local oscillator signal that can be used by the millimeter-wave radar; so that a phase-locked loop can meet the performance index required by the frequency-sweeping source.
Description
technical field [0001] The invention relates to the technical field of sweep frequency sources, in particular to a sweep frequency source and an unmanned aerial vehicle system for millimeter wave radars. Background technique [0002] Direct Digital Synthesizer (DDS) technology has been widely used in communications, radar, electronic countermeasures and other electronic systems. With the development of digital integrated circuits and microelectronics technology, DDS technology has gradually improved, fully reflecting its The relative bandwidth is very wide, the frequency conversion time is extremely short, the frequency resolution is very high, the output phase is continuous, the broadband quadrature signal can be output, and the programmable and fully digital structure is easy to integrate. [0003] Due to the flexible configuration of DDS and good frequency linearity, the current radar FM signal is usually generated by DDS. Since the output frequency of DDS is low (below ...
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IPC IPC(8): H03L7/20H03L7/093G01S7/02
CPCH03L7/093H03L7/20G01S7/02
Inventor 张鹏李一远王朝民郗晓菲冀晓楠苏蓉
Owner 北京望远四象科技有限公司