A Doppler Radar Velocity Measurement Technique Based on Time-Frequency Divided Crossed Beams

ZHAO Lu; SHI Changli; YU Cong; DAI Zongwu; CHENG Hongyan

doi:10.15892/j.cnki.djzdxb.2025.05.035

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 5: 911 - 918

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.05.035

Academic article

A Doppler Radar Velocity Measurement Technique Based on Time-Frequency Divided Crossed Beams

ZHAO Lu ^,¹ ,
SHI Changli ^,²^,^* ,
YU Cong ¹ ,
DAI Zongwu ² ,
CHENG Hongyan ²

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¹ Jiangxi Hongdu Aviation Industry Co., Ltd, Nanchang 330001, Jiangxi, China
² Space Star Technology Co., Ltd, Beijing 100086, China

Received date: 2025-04-18

Online published: 2025-11-28

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Abstract

Doppler radar velocity measurement technology is a critical component of autonomous navigation systems. It determines flight velocity by deriving the Doppler shift from the echo signal spectrum. However, the characteristics of the Doppler radar echo spectrum are susceptible to terrain scattering effects, particularly in desert environments. Under such conditions, the spectral center of the Doppler radar echo undergoes significant frequency shift, resulting in degraded velocity measurement accuracy. This paper innovatively proposes a time-frequency division cross beam velocity measurement technology. On the basis of traditional single beam speed measurement, the time-division processing method is used to transmit two signals of different frequencies, which are radiated through the same antenna to form crossed beams. The flight velocity is obtained by calculating the frequency value of the cross point. Based on actual flight test data verification, it has been concluded that this technology effectively resolves the issue of velocity measurement deviation caused by Doppler radar echo spectral shift in desert terrain. Simultaneously, by equivalently reducing beam width through crossed-beam overlap, the spectral width of the crossed-beam echo at the crossover frequency is smaller than that of a single-beam echo, thereby reducing the random error in velocity measurements. Therefore, the velocity measurement technology based on time-frequency divided crossed beams proposed in this paper effectively enhances the velocity measurement accuracy of Doppler radar.

Key words： doppler radar; autonomous navigation; terrain scattering characteristics; time and frequency division crossed beams; velocity measurement accuracy

Cite this article

ZHAO Lu , SHI Changli , YU Cong , DAI Zongwu , CHENG Hongyan . A Doppler Radar Velocity Measurement Technique Based on Time-Frequency Divided Crossed Beams[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(5) : 911 -918 . DOI: 10.15892/j.cnki.djzdxb.2025.05.035

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