Method for fast calibrating transmitting frequency of radar

Abstract

The present invention provides a method for fast calibrating the transmitting frequency of a radar. The method comprises the following steps that: S1, the wave band of the radar is modulated so as tobe a frequency band in which the frequencies of the radar under the wave band are in linear relationships with VCO control voltages corresponding to the frequencies of the radar; S2, a center frequency in the frequency band in which the frequencies are in linear relationships with the VCO control voltages is selected as a calibration frequency, a VCO voltage value corresponding to the calibrationfrequency is adopted as a calibration voltage; and S3, a VCO voltage value corresponding to an initial frequency in the frequency band in which the frequencies are in linear relationships with the VCOcontrol voltages, a VCO voltage value corresponding to the calibration frequency, and a VCO voltage value corresponding to a cut-off frequency in the frequency band in which the frequencies are in linear relationships with the VCO control voltages are measured, so that linear relationships between the frequencies and the VCO voltage values are obtained. The VCO voltage value corresponding to thecalibration frequency is given; feedback is performed through a frequency sampling circuit, so that a feedback-post calibration frequency is obtained; and when the feedback-post calibration frequencyis inconsistent with the calibration frequency, the calibration voltage is adjusted, so that the calibration frequency measured by the frequency sampling circuit is made to be consistent with the calibration frequency.

Description

technical field [0001] The invention relates to the technical field of radar calibration, in particular to a method for quickly correcting the transmission frequency of a radar. Background technique [0002] Radar, that is, "radio detection and ranging", uses radio methods to find targets and determine their spatial positions; [0003] In practical applications, the faster the refresh rate of the radar, the higher the refresh rate of the distance between the vehicle and the obstacle equipped with the radar. Collision; [0004] In theory, the refresh frequency of the radar depends on the listening time set by the radar itself, that is, the time of one frame of the radar. However, in practical applications, the transmission frequency of the radar will be affected by the change of the external temperature, resulting in a decrease in the accuracy of the radar itself. , the error increases; in this field, multi-frequency calibration is usually used to control the radar transmis...

AI Technical Summary

Problems solved by technology

[0004] In theory, the refresh frequency of the radar depends on the listening time set by the radar itself, that is, the time of one frame of the radar. However, in practical applications, the transmission frequency of the radar will be affected by the change of the external temperature, resulting in a decrease in the accuracy of the radar itself. , the error increases; in this field, multi-frequency calibration is usually used to control the radar transmission frequency; the actual refresh frequency time of the radar is also added with the calibration time of the transmission frequency on the basis of the monitoring time, and the multi-frequency calibration method requires The long calibration time indirectly reduces the refresh frequency of the radar. It is intuitively reflected that the multi-frequency calibration method is difficult to improve the refresh frequency of the radar and the accuracy of the radar ranging at the same time; therefore, how to reduce the frequency calibration time and improve the timeliness of system alarms Sex is something that needs to be addressed now

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