High repetition frequency velocity measurement method based on frequency stepping LFMCW

A frequency-stepping, high-repetition frequency technology, applied in the field of automotive anti-collision radar, can solve problems such as difficulty in meeting application requirements, difficulty in meeting application requirements in distance resolution, and inability to meet simultaneously

Active Publication Date: 2019-07-16
北京理工雷科电子信息技术有限公司
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  • Abstract
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  • 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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  • High repetition frequency velocity measurement method based on frequency stepping LFMCW
  • High repetition frequency velocity measurement method based on frequency stepping LFMCW
  • High repetition frequency velocity measurement method based on frequency stepping LFMCW

Examples

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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 (starting) 77GHz Sampling Rate 10MHz pulse width 9μs sub-pulse width 25MHz repeat frequency 110kHz Number of accumulated pulses at the same frequency 256 frequency hopping interval 25MHz frequency hopping 6 Target distance (m) 100，200，205 target speed(m / s) 100，10，10

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

[0057] The unambiguous speed measurement range is ±110m / s, and the speed resolution is 0.85m / s, so there is no Doppler ambiguity for the three targets. Figure 3(a) is the ...

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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 radar, and in particular relates to a high-repetition-frequency speed measurement method based on frequency stepping LFMCW. Background technique [0002] Since the millimeter-wave radar adopting the continuous wave linear frequency modulation system (LFMCW) has the characteristics of high distance resolution, low 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] Automotive anti-collision radar must have accurate ranging function, and be able to measure speed and angle. Among the three functions of distance measurement, speed measurement and angle measurement, distance measurement is the core. After the distance measurement function is realized, the basic functions such as alarm and braking of the anti-collision radar can be realized. The reason why the automo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58
CPCG01S13/582
Inventor 陈天明周超冯文玲胡晓娜
Owner 北京理工雷科电子信息技术有限公司
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