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Chirp frequency non-linearity mitigation in radar systems

A radar equipment, integer frequency division technology, applied in the field of radar

Active Publication Date: 2018-04-17
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

N is an integer

Method used

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  • Chirp frequency non-linearity mitigation in radar systems
  • Chirp frequency non-linearity mitigation in radar systems
  • Chirp frequency non-linearity mitigation in radar systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] figure 1 A radar device 100 according to an embodiment is shown. Radar device 100 includes a transmitting unit 110 , a receiving unit 140 , an adjustment circuit 155 and a processor 160 . The transmit unit 110 includes the ramp generator 102 . Sigma-delta modulator (SDM) 104 is coupled to ramp generator 102 . Combiner 112 is coupled to SDM 104 . The reference crystal 106 generates the reference clock F ref 108, and will reference the clock F ref 108 is provided to a synthesizer 112 . A power amplifier (PA) 126 is coupled to the combiner 112 . Transmit antenna unit 128 is coupled to PA 126 . In one example, the transmit unit 110 includes a plurality of transmit antenna units.

[0012] The synthesizer 112 includes a frequency divider 114 , a phase error pulse generator 116 , a charge pump 118 , a loop filter 120 and a VCO (voltage controlled oscillator) 122 . Phase error pulse generator 116 is coupled to frequency divider 114 and reference crystal 106 . Charge p...

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PUM

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Abstract

In described examples, a radar apparatus (100) includes a transmit unit (110) that generates a first signal (124) in response to a reference clock (108) and a feedback clock. The first signal (124) isscattered by one or more obstacles to generate a second signal (145). A receive unit (140) receives the second signal (145) and generates N samples corresponding to the second signal (145). N is an integer. A conditioning circuit (155) is coupled to the transmit unit (110) and the receive unit (140). The conditioning circuit (155) receives the N samples corresponding to the second signal (145), and generates N new samples using an error between the feedback clock and the reference clock (108).

Description

technical field [0001] The present invention relates generally to radars, and more particularly to mitigating the non-linearity of chirps generated in radars. Background technique [0002] The use of radar in automotive and industrial applications is growing rapidly. Radar is used in a variety of applications associated with vehicles, such as collision warning, blind spot warning, lane change assistance, parking assistance, and rear collision warning. In an industrial environment, radar is used to determine the relative position and relative velocity of obstacles around the radar. Pulse radar and FMCW (Frequency Modulated Continuous Wave) radar are mainly used for such applications. [0003] In FMCW radar, the synthesizer generates ramp segments by frequency modulating the transmitted signal. The ramp segment is also called a chirp. Ramp segments are amplified and emitted by one or more transmitting units. The slope segment is scattered by one or more obstacles to gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S7/02
CPCG01S7/4008G01S13/343G01S13/584H03L7/06H03L7/0805H03L7/12G01S7/35G01S13/583
Inventor S·巴拉德瓦杰K·苏布拉吉
Owner TEXAS INSTR INC