A Method for Automatically Distinguishing FM Intervals of lfmcw Radar Based on Synchronous Pulse

A synchronous pulse and radar technology, applied in the field of signal processing, can solve the problem of inability to distinguish echo signals, and achieve the effect of easy implementation and high stability

Active Publication Date: 2020-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the duration of each of the above three transmission signals is the same, and the three transmission signals are transmitted continuously, which makes it impossible for us to distinguish the echo signals corresponding to different transmission intervals.

Method used

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  • A Method for Automatically Distinguishing FM Intervals of lfmcw Radar Based on Synchronous Pulse
  • A Method for Automatically Distinguishing FM Intervals of lfmcw Radar Based on Synchronous Pulse
  • A Method for Automatically Distinguishing FM Intervals of lfmcw Radar Based on Synchronous Pulse

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Embodiment Construction

[0024] according to image 3 The flow chart, based on ADI's Blackfin706 and ADF4159 and ADF5901 to build a platform for experiments.

[0025] ADF4159 is a waveform generator with a phase detector, and ADF5901 is a voltage-controlled oscillator. The two plus a loop filter system can form a phase-locked loop to generate the required three-segment FM LFMCW transmission signal. The frequency range is 24GHz~24.25GHz. For the ADF4159, it can generate at most two triangle waves with different slopes as the frequency modulation control signal at the same time, which can be realized by configuring and enabling Ramp1 and Ramp2 of the ADF4159 respectively, where Ramp1 is enabled by default, and Ramp2 is optional. A Ramp is divided into two sections before and after. When the frequency modulation control signal of each section is generated, a pulse signal will be generated at the MUXOUT pin of the ADF4159 at the same time, such as Figure 4 shown. BF706 is the processor for signal proc...

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Abstract

The invention discloses a method for automatically distinguishing frequency modulation intervals of an LFMCW radar based on synchronous pulses, belongs to signal processing technology, and specifically relates to signal synchronization technology. The present invention modifies the three-segment FM LFMCW radar transmission signal into four segments including: 1T positive slope segment, 1T negative slope segment, first T / 2 constant frequency segment, second T / 2 constant frequency segment, each segment A synchronous pulse signal is set at the initial moment of the signal, and a state counter is introduced into the processor, so as to realize the purpose of the invention. The effects include: there is no need to manually distinguish the synchronization, and only rely on the processor to judge the current sampling state to automatically distinguish the synchronization of the three-stage beat signal to realize automatic distinction; when there is an abnormality inside the system, such as the synchronization of the three-stage beat signal occurs In the event of dislocation, this method can also play the role of automatic error correction, and can quickly re-distinguish the three-stage beat signal synchronously; it is easy to implement, has high stability, and is suitable for real-time signal processing.

Description

Technical field: [0001] The invention belongs to signal processing technology, in particular to signal synchronization technology. Background technique: [0002] LFMCW (Linear Frequency Modulated Continuous Wave) radar is often used in target distance measurement because of its high measurement accuracy and the advantages of not introducing ambiguous distance. The transmitter generates continuous high-frequency equal-amplitude waves, and the transmission frequency changes linearly with time, generally according to the triangle law. The echo of the target is directly mixed with the transmitted waveform. Due to the time difference between the echo and the transmitted waveform and the reason of linear frequency modulation, the beat signal obtained after mixing will be a signal whose frequency is linearly related to the target distance, that is, The frequency of the beat signal is used to measure the distance of the target. [0003] For moving targets, because the frequency of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/50
Inventor 邹林汪意焙魏鹏姜帅龙周云钱璐汪学刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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