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A High Repetition Speed ​​Velocity Measurement Method Based on Frequency Step lfmcw

A frequency-stepping, high-repetition frequency technology, applied in the field of automotive anti-collision radar, can solve problems such as limitations, difficulty in meeting application needs, and large distance resolution

Active Publication Date: 2020-12-18
BEIJING RACOBIT ELECTRONIC INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the LFMCW signal, when the frequency modulation slope is constant, the larger the bandwidth and the larger the pulse repetition period (PRT), the smaller the PRF, which limits the maximum unambiguous speed measurement range
When other technologies are not used, the higher distance resolution and the larger unambiguous speed measurement range are contradictory, and cannot be satisfied at the same time.
When the maximum unambiguous speed measurement range is met, the distance resolution is difficult to meet the actual application needs
If the distance resolution is satisfied, the maximum unambiguous speed measurement range is difficult to meet the actual application needs

Method used

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  • A High Repetition Speed ​​Velocity Measurement Method Based on Frequency Step lfmcw
  • A High Repetition Speed ​​Velocity Measurement Method Based on Frequency Step lfmcw
  • A High Repetition Speed ​​Velocity Measurement Method Based on Frequency Step lfmcw

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Experimental program
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Effect test

Embodiment

[0053]In this example, the relevant parameters are as follows:

[0054]Table 1 Step frequency PD waveform simulation parameters

[0055] parameter name Parameter value parameter name Parameter value Carrier frequency (start) 77GHz Sampling Rate 10MHz Pulse width 9μs Sub-pulse bandwidth 25MHz Re-frequency 110kHz Accumulated pulse number at the same frequency 256 Frequency hopping interval 25MHz Frequency hopping 6 Target distance (m) 100，200，205Target speed (m / s) 100，10，10

[0056]First, the PD processing results at each frequency point are as followsfigure 2 Shown. Under the simulation parameters of this embodiment, the range resolution of the sub-pulse is 6m, so the two targets at 200m and 205m cannot be distinguished.

[0057] The unambiguous velocity measurement range is ±110m / s, and the velocity resolution is 0.85m / s, so for the three targets, no Doppler blur occurs. Figure 3(a) is the range slice of the target at 100m, and Figure 3(b) is the range slice of the target at 200m.

[0058]...

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Abstract

The invention discloses a high repetition frequency velocity measurement method based on frequency stepping LFMCW, which obtains a larger non-fuzzy velocity measurement range by using high repetitionfrequency, and simultaneously splices signals by using the characteristics of frequency stepping LFMCW signals to obtain higher distance resolution; and compared with the traditional high-distance resolution, low-ambiguity speed measurement range or low-distance resolution and high-ambiguity speed measurement range, the high repetition frequency velocity measurement method has more application advantages.

Description

Technical field[0001]The invention belongs to the technical field of automobile anti-collision radars, and specifically relates to a high-repetition-frequency speed measurement method based on frequency stepping LFMCW.Background technique[0002]Because the millimeter-wave radar using continuous wave linear frequency modulation (LFMCW) has the characteristics of high range resolution, small transmission power, small size, light weight, and strong anti-interference ability, it has been widely used in many fields such as automotive radar. application.[0003]Automobile anti-collision radar must have accurate ranging function, and can measure speed and angle. Among the three major functions of ranging, speed and angle measurement, ranging is the core. After the ranging function is implemented, basic functions such as alarm and braking of the anti-collision radar can be realized. The reason why the automobile collision avoidance radar measures the speed of the target vehicle is to calculate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58
CPCG01S13/582
Inventor 陈天明周超冯文玲胡晓娜
Owner BEIJING RACOBIT ELECTRONIC INFORMATION TECH CO LTD
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