阅读说明：本技术 一种基于信号处理角度的机扫雷达方位波束中心修正方法 (Method for correcting azimuth beam center of machine-scanning radar based on signal processing angle ) 是由 陆晓明 童朝平 范延伟 周仕祺 彭文丽 彭嘉宇 彭学江 杨瑞明 郭云燕 于 2021-10-19 设计创作，主要内容包括：本发明涉及雷达数据处理技术领域,具体涉及一种基于信号处理角度的机扫雷达方位波束中心修正方法,包括：假设修正后的等效波束中心为信号处理之前的角度为信号处理之后的角度为定义方位波束中心修正系数为α,根据信号处理前后的伺服的角度,以及基于相参处理间隔和信号处理时间,计算得到等效方位波束中心,具体计算方法为：等效波束中心等于相参处理间隔起始伺服的角度与信号处理结束后伺服的角度二者加权得到；而等效波束中心的方位修正加权系数基于相参处理间隔和信号处理时间计算得到,可以有效修正机扫雷达中因为天线转动引入的系统角度偏差,有效提高方位测角精度。(The invention relates to the technical field of radar data processing, in particular to a method for correcting the center of a machine-scanning radar azimuth beam based on a signal processing angle, which comprises the following steps: assuming the modified equivalent beam center as The angle before signal processing is The angle after signal processing is Defining an azimuth beam center correction coefficient as alpha, calculating to obtain an equivalent azimuth beam center according to the servo angle before and after signal processing and based on a coherent processing interval and signal processing time, and specifically calculatingThe method comprises the following steps: the equivalent beam center is obtained by weighting the angle of the initial servo of the coherent processing interval and the angle of the servo after the signal processing is finished; and the azimuth correction weighting coefficient of the equivalent beam center is calculated and obtained based on the coherent processing interval and the signal processing time, so that the system angle deviation caused by the rotation of the antenna in the scanning radar of the machine can be effectively corrected, and the azimuth angle measurement precision is effectively improved.)

1. A method for correcting the azimuth beam center of a machine-scanning radar based on a signal processing angle is characterized by comprising the following steps:

assuming the modified equivalent beam center asThe angle before signal processing isThe angle after signal processing isDefining the correction coefficient of the center of the azimuth beam as alpha, and then the correction method of the center of the equivalent beam is as follows:

2. the method for correcting the azimuth beam center of the machine-swept radar based on the signal processing angle as claimed in claim 1, wherein: angle before signal processingThe servo code wheel angle can be read and stored in degrees (deg.) before the beginning of each Coherent Processing Interval (CPI); angle after signal processingThe servo code wheel angle can be read and stored after all signal processing is finished, and the unit is degree (degree).

3. The method for correcting the azimuth beam center of the machine-swept radar based on the signal processing angle as claimed in claim 1, wherein: the calculation method of the correction coefficient of the azimuth beam center comprises the following steps:

α＝T_0.5t/T_total

in the formula, T_0.5tTime in seconds(s) from the beginning of the Coherent Processing Interval (CPI) to the equivalent beam center; t is_totalFrom the beginning of the Coherent Processing Interval (CPI) to the end of the CPIThe elapsed time for the number processing to be completed is in units of seconds(s).

4. The method for correcting the azimuth beam center of the machine-swept radar based on the signal processing angle as claimed in claim 3, wherein: time T from the beginning of Coherent Processing Interval (CPI) to the equivalent beam center_0.5tThe calculation method comprises the following steps:

T_0.5t＝0.5·T_c

in the formula, T_cIs the Coherent Processing Interval (CPI) in seconds(s), T_c＝N·T_PRIWhere N is the number of pulses of coherent integration, T_PRIIs the pulse repetition interval in seconds(s).

5. The method for correcting the azimuth beam center of the machine-swept radar based on the signal processing angle as claimed in claim 3, wherein: time T elapsed from the start of Coherent Processing Interval (CPI) to completion of signal processing_totalThe calculation method comprises the following steps:

T_total＝T_c+T_sp

in the formula, T_cFor coherent processing of intervals, T_spThe unit of the time consumed by the echo of N sampled pulses through signal processing procedures such as pulse compression, Doppler accumulation, constant false alarm rate detection and the like is second(s).

Technical Field

The invention relates to the technical field of radar data processing, in particular to a method for correcting the center of a machine-scanning radar azimuth beam based on a signal processing angle.

Background

The one-dimensional phased array radar of the existing azimuth scanning and pitching electric scanning system generally adopts a mode of measuring angles by comparing amplitudes in the azimuth direction to improve the angle measurement precision. However, during the course of azimuth beam scanning, the rotation of the antenna causes the beam center to change, and the position of the target relative to the beam center to change, i.e., the position of the target relative to the beam center in each Pulse Repetition Interval (PRI) is different in one Coherent Processing period (CPI).

For the radar adopting the sum-difference amplitude measurement, the calculation method of the azimuth angle comprises the following steps:

in the formula (I), the compound is shown in the specification,is the beam center;the deviation angle of the target relative to the beam center is calculated by the sum and difference amplitude ratios. The rotation of the antenna can introduce extra system angle deviation to influence the center of an azimuth beam, thereby influencing azimuth angle measurement precision.

Disclosure of Invention

In view of the above-mentioned shortcomings in the prior art, a first object of the present invention is to provide a method for correcting the azimuth beam center of a machine-swept radar based on a signal processing angle, which solves the above-mentioned problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a method for correcting the azimuth beam center of a machine-scanning radar based on a signal processing angle comprises the following steps:

assuming the modified equivalent beam center asThe angle before signal processing isThe angle after signal processing isDefining the correction coefficient of the center of the azimuth beam as alpha, and then the correction method of the center of the equivalent beam is as follows:

the invention is further configured to: angle before signal processingThe servo code wheel angle can be read and stored in degrees (deg.) before the beginning of each Coherent Processing Interval (CPI); angle after signal processingThe servo code wheel angle can be read and stored after all signal processing is finished, and the unit is degree (degree).

The invention is further configured to: the calculation method of the correction coefficient of the azimuth beam center comprises the following steps:

α＝T_0.5t/T_total

in the formula, T_0.5tTime in seconds(s) from the beginning of the Coherent Processing Interval (CPI) to the equivalent beam center; t is_totalThe elapsed time from the start of the Coherent Processing Interval (CPI) to the completion of signal processing is given in seconds(s).

The invention is further configured to: time T from the beginning of Coherent Processing Interval (CPI) to the equivalent beam center_0.5tThe calculation method comprises the following steps:

T_0.5t＝0.5·T_c

in the formula, T_cIs the Coherent Processing Interval (CPI) in seconds(s), T_c＝N·T_PRIWhere N is the number of pulses of coherent integration, T_PRIIs the pulse repetition interval in seconds(s).

The invention is further configured to: time T elapsed from the start of Coherent Processing Interval (CPI) to completion of signal processing_totalThe calculation method comprises the following steps:

T_total＝T_c+T_sp

in the formula, T_cFor coherent processing of intervals, T_spThe unit of the time consumed by the echo of N sampled pulses through signal processing procedures such as pulse compression, Doppler accumulation, constant false alarm rate detection and the like is second(s).

Advantageous effects

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

1. calculating to obtain an equivalent azimuth beam center according to the servo angles before and after signal processing and based on the coherent processing interval and the signal processing time, wherein the specific calculation method comprises the following steps: the equivalent beam center is obtained by weighting the angle of the initial servo of the coherent processing interval and the angle of the servo after the signal processing is finished; the azimuth correction weighting coefficient of the equivalent beam center is calculated and obtained based on the coherent processing interval and the signal processing time;

2. the system angle deviation caused by the rotation of the antenna in the radar can be effectively corrected, and the azimuth angle measurement precision is effectively improved.

Description of the drawings:

fig. 1 is a schematic diagram of an equivalent beam center of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention will be further described with reference to an embodiment with reference to fig. 1.

A method for correcting the azimuth beam center of a machine-scanning radar based on a signal processing angle comprises the following steps:

assuming the modified equivalent beam center asThe angle before signal processing isThe angle after signal processing isDefining the azimuth beam center correction coefficient as alpha,the method for correcting the center of the equivalent beam is as follows:

angle before signal processingThe servo code wheel angle can be read and stored in degrees (deg.) before the beginning of each Coherent Processing Interval (CPI); angle after signal processingThe servo code wheel angle can be read and stored after all signal processing is finished, and the unit is degree (degree).

The calculation method of the correction coefficient of the azimuth beam center comprises the following steps:

α＝T_0.5t/T_total

in the formula, T_0.5tTime in seconds(s) from the beginning of the Coherent Processing Interval (CPI) to the equivalent beam center; t is_totalThe elapsed time from the start of the Coherent Processing Interval (CPI) to the completion of signal processing is given in seconds(s).

Time T from the beginning of Coherent Processing Interval (CPI) to the equivalent beam center_0.5tThe calculation method comprises the following steps:

T_0.5t＝0.5·T_c

in the formula, T_cIs the Coherent Processing Interval (CPI) in seconds(s), T_c＝N·T_PRIWhere N is the number of pulses of coherent integration, T_PRIIs the pulse repetition interval in seconds(s).

Time T elapsed from the start of Coherent Processing Interval (CPI) to completion of signal processing_totalThe calculation method comprises the following steps:

T_total＝T_c+T_sp

in the formula, T_cFor coherent processing of intervals, T_spThe echo waves of the N sampled pulses are subjected to pulse compression, Doppler accumulation and constant ghostThe unit of time consumed by signal processing flows such as alarm rate detection is second(s).

An example of the calculation of the orientation correction factor is given below:

suppose that the Pulse Repetition Interval (PRI) of a radar is 41.4us, the number of coherent accumulated pulses is 256, and the signal processing time is T_sp＝9.4×10^-3And s. The coherent processing interval is

T_c＝41.4×10^-6×256＝0.0105984s

And the azimuth correction coefficient is

And calculating to obtain the equivalent azimuth beam center according to the servo angles before and after signal processing and based on the coherent processing interval and the signal processing time. The specific calculation method comprises the following steps: the equivalent beam center is obtained by weighting the angle of the initial servo of the coherent processing interval and the angle of the servo after the signal processing is finished; and the azimuth correction weighting coefficient of the equivalent beam center is calculated and obtained based on the coherent processing interval and the signal processing time, so that the system angle deviation caused by the rotation of the antenna in the scanning radar of the machine can be effectively corrected, and the azimuth angle measurement precision is effectively improved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.