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Radar signal transmitting and receiving method and device

A radar device and radar signal technology, applied in the field of radar, can solve the problem that the orthogonal waveform cannot simultaneously realize the speed measurement range and angle resolution, etc.

Pending Publication Date: 2022-06-24
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of this application is to provide a method and device for transmitting and receiving radar signals to overcome the problem that the orthogonal waveforms sent by existing radar devices cannot simultaneously meet the requirements for speed measurement range and angular resolution

Method used

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  • Radar signal transmitting and receiving method and device
  • Radar signal transmitting and receiving method and device
  • Radar signal transmitting and receiving method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] like Figure 4 As shown, a schematic diagram of a signal provided by an embodiment of the present application. Figure 4 , with N=3, that is, there are 3 transmitting antennas for radar signal transmission, P=2, that is, the phase shifter can at least provide stable 0 and π phase modulation, m=2, the second signal includes two transmitting antennas An antenna is used as an example to illustrate. According to the foregoing description, M is an integer greater than or equal to m / (P-1). Then it can be calculated that M is greater than or equal to 2, the minimum value of M is taken, and M=2 is taken as an example for description. exist Figure 4 , the first signal is transmitted through the transmitting antenna Tx0, and in the S time slots, the first signal includes S chirp signals, and the phase between each chirp signal is unchanged.

[0132] The second signal includes a plurality of chirp signals. The second signal is time-divisionally transmitted through the transmi...

Embodiment 2

[0142] In the second embodiment, in addition to the simultaneous transmission of the first signal and the second signal in the S time slots, further in the S0 time slots after the S time slots, the m transmitting antennas may be used to transmit the first signal in a time-division manner. Three signals, S0 is an integer greater than 1.

[0143] The transmission pattern of the third signal in S0 time slots is the same as the transmission pattern of the second signal in S time slots, S=Nd*P*M, where M is an integer greater than or equal to m / (P-1).

[0144] There is no first signal in the S0 time slots. Since the first signal sent by Tx0 only exists in the S time slot, the Doppler frequency in the received echo signals in the S0 time slots can be compared with the S The Doppler frequency in the received echo signal in the time slot determines the Doppler frequency of the target, and determines the Doppler index position corresponding to Tx0 in the S time slots, which further sim...

Embodiment 3

[0148] In the previous embodiment, P=2 is taken as an example for description. The number of phases P included in the second signal can also be other values, for example, when P=4, such as Image 6 As shown, a schematic diagram of a signal provided by an embodiment of the present application. Image 6 , take m=6, P=4, M=2 as an example for description. exist Image 6 Among them, the first signal is sent through the transmitting antenna Tx0, the first signal includes S chirp signals, and the phase of each chirp signal remains unchanged.

[0149]The second signal is sent through the transmit antenna Tx1 to the transmit antenna Tx6, and the period of the signal sent by each transmit antenna is 8 time slots. The 6 transmit antennas can be divided into 2 groups, one group includes Tx1, Tx2 and Tx3, and the other group includes Tx4, Tx5 and Tx6.

[0150] Tx1, Tx2 and Tx3 can occupy the same time slot, but use different phase modulation codes to transmit signals respectively. Sp...

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Abstract

A radar signal transmitting and receiving method and device is applied to a radar device, and comprises the following steps: transmitting a first signal and a second signal in S time slots; the phase of the first signal is unchanged in S time slots, and the first signal can be equivalent to an SIMO signal; the second signal is sent in at least one of a time division mode and a code division mode; and in the second signal, the signal sent by each of the m transmitting antennas is subjected to phase modulation by adopting a step length of 2piky / P, which is equivalent to an MIMO signal. Wherein when P is equal to 2, the MIMO signal is sent in a time division mode, Pgt; and 2, the MIMO signal is sent in a time division mode and a code division mode. In the method, the first signal and the second signal are simultaneously sent in the S time slots, so that the duration required for detecting the target through the first signal and the second signal is obviously reduced, and the detection efficiency can be improved.

Description

[0001] This application is a divisional application, the application number of the original application is 202080004671.9, the original application date is May 30, 2020, and the entire content of the original application is incorporated into this application by reference. technical field [0002] The present application relates to the technical field of radar, and in particular, to a method and device for transmitting and receiving radar signals. Background technique [0003] The on-board radar is an indispensable sensor in the autonomous driving system. The on-board radar can provide the vehicle with obstacle (also called target) detection. Specifically, the vehicle-mounted radar can transmit a frequency modulated continuous wave (FMCW), and measure the distance, speed, and azimuth angle of the obstacle by detecting the reflected echo of the obstacle. [0004] In recent years, vehicle radar technology has been continuously evolving, and the performance of vehicle radar has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/34G01S13/931
CPCG01S7/02G01S13/34G01S13/931G01S13/584G01S13/42G01S13/325G01S7/35G01S2013/0263
Inventor 劳大鹏刘劲楠刘荣江杨晨朱金台李德建
Owner HUAWEI TECH CO LTD