CN113219423A - Phase jitter evaluation method for ground penetrating radar antenna - Google Patents
Phase jitter evaluation method for ground penetrating radar antenna Download PDFInfo
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- CN113219423A CN113219423A CN202110354756.6A CN202110354756A CN113219423A CN 113219423 A CN113219423 A CN 113219423A CN 202110354756 A CN202110354756 A CN 202110354756A CN 113219423 A CN113219423 A CN 113219423A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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Abstract
The invention discloses a method for evaluating phase jitter of a ground penetrating radar antenna, which comprises the following steps: step 1, radar data are obtained, and an antenna and a radar host are connected through a cable; step 2, reading parameters of each original data; step 3, obtaining the number of sampling points corresponding to the maximum value of the positive peak of the direct-coupled wave of each channel of data; step 4, obtaining the number of sampling points corresponding to the maximum value of the negative peak of the direct-coupled wave of each channel of data; step 5, obtaining the number of sampling points corresponding to the maximum value of the positive peak of the reflected wave of each data; and 6, obtaining the number of sampling points corresponding to the maximum value of the negative peak of the reflected wave of each channel of data. The method for evaluating the phase jitter of the ground penetrating radar antenna can visually judge the phase jitter of the antenna in the radar system, so that the indexes of the evaluation performance of the ground penetrating radar system are diversified, and the evaluation system is more objective and complete.
Description
Technical Field
The invention belongs to the field of underground target detection, and particularly relates to a phase jitter evaluation method for a ground penetrating radar antenna in the field.
Background
The ground penetrating radar detects underground targets by utilizing the capability of electromagnetic waves penetrating through underground media, and the accuracy and stability of original data are very important for later data processing. The phase jitter of the antenna causes an error in arrival time of the reflected wave. From radar single-pass data, antenna phase jitter causes data to float up and down the depth method. If the antenna phase jitter of the radar system is large, the error between the target position information obtained from the echo signal and the real position information is also large, and meanwhile, the imaging quality and the target recognition rate of the underground target are influenced. In order to ensure the stability of the original data, the smaller the radar antenna phase jitter is, the better the radar antenna phase jitter is.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for evaluating phase jitter of a ground penetrating radar antenna.
The invention adopts the following technical scheme:
the improvement of the method for evaluating the phase jitter of the ground penetrating radar antenna is that the method comprises the following steps:
step 1, acquiring radar data, connecting an antenna and a radar host machine by using a cable, placing the antenna on a foam body with the height being 2 times of the central frequency wavelength of the antenna, placing the foam body on a copper-clad plate with the height being 4 times of the central frequency wavelength of the antenna, overlapping the copper-clad plate and a central shaft of the antenna, and storing the acquired data, wherein the number of data tracks is more than 1000;
step 2, reading parameters of each original data, including sampling points, time windows, frequencies and track numbers, and shaving the front 200 tracks of data and the back 200 tracks of data of the original data;
step 3, calculating the positive peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L1 corresponding to the maximum value of the positive peak of the direct-coupled wave of each channel of data (L ═ L)1,…lm,…ln]The maximum value, the minimum value and the average value of the L1 are respectively represented by Max1, Min1 and M1, and the positive peak phase jitter of the direct-coupled wave is represented by Y1 ═ (Max1-Min 1)/M1;
step 4, calculating the negative peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L2 corresponding to the maximum value of the negative peak of the direct-coupled wave of each channel of data [ L ═ L1,…lm,…ln]The maximum value, the minimum value and the average value of the L2 are respectively represented by Max2, Min2 and M2, and the negative peak phase jitter of the direct-coupled wave Y2 is (Max2-Min 2)/M2;
step 5, calculating the positive peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L3 corresponding to the maximum value of the positive peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, the minimum value and the average value of the L3 are respectively represented by Max3, Min3 and M3, and the positive peak phase jitter of the reflected wave Y3 is (Max3-Min 3)/M3;
step 6, calculating the negative peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L4 corresponding to the maximum value of the negative peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, minimum value, and average value of L4 are represented by Max4, Min4, and M4, respectively, and the negative peak phase jitter Y4 of the reflected wave is (Max4-Min 4)/M4.
The invention has the beneficial effects that:
the method for evaluating the phase jitter of the ground penetrating radar antenna disclosed by the invention is characterized in that the algorithm of combining ground penetrating radar data with the phase jitter of the antenna is used for calculating the direct coupling wave of the radar data and the positive peak phase jitter and the negative peak phase jitter of the reflected wave, so that the size of the phase jitter of the antenna in a radar system can be visually judged, the indexes of the evaluation performance of the ground penetrating radar system are diversified, and the evaluation system is more objective and complete.
When the phase jitter of the antenna is large, the phase jitter of the antenna in the system can be reduced by adopting a moving average or filtering method, so that the stability of the original data of the underground target is enhanced, the target information contained in the radar reflected wave data can be conveniently and accurately obtained, and the imaging and identification of the underground target are facilitated.
Drawings
FIG. 1 is a schematic diagram of single track waveform phase jitter;
FIG. 2 is a flow chart of antenna phase jitter cancellation;
FIG. 3 is a schematic flow chart of the disclosed evaluation method;
fig. 4 is a schematic diagram of an antenna arrangement for the disclosed evaluation method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The influence of the antenna phase jitter on the radar single-track waveform is shown in fig. 1, the value of a point P in the radar single-track waveform jitters up and down along the ordinate, and data is unstable.
The flow of the method for eliminating the antenna phase jitter is shown in fig. 2, and during radar data acquisition, the antenna phase jitter can be eliminated by adopting a moving average or filtering algorithm.
In embodiment 1, this embodiment discloses a method for evaluating phase jitter of a ground penetrating radar antenna, which evaluates the phase jitter of the antenna based on ground penetrating radar data, and includes information of direct-coupled wave positive peak phase jitter, direct-coupled wave negative peak phase jitter, reflected wave positive peak phase jitter, and reflected wave negative peak phase jitter. As shown in fig. 3, the method specifically includes the following steps:
step 1, acquiring radar data, connecting an antenna and a radar host by using a cable, placing the antenna on a foam body with the height being 2 times of the central frequency wavelength of the antenna as shown in figure 4, placing the foam body on a copper-clad plate with the height being 4 times of the central frequency wavelength of the antenna, superposing the copper-clad plate and the central axis of the antenna, and storing the acquired data, wherein the number of data tracks is more than 1000;
step 2, reading parameters such as sampling points, time windows, frequencies, channel numbers and the like of each original data, and shaving the front 200 channels of data and the back 200 channels of data of the original data;
step 3, calculating the positive peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L1 corresponding to the maximum value of the positive peak of the direct-coupled wave of each channel of data (L ═ L)1,…lm,…ln]The maximum value, the minimum value and the mean value of L1 are respectively Max1, Min1 and M1 indicate that the positive peak phase jitter of the direct coupled wave is Y1 ═ Max1-Min 1)/M1;
step 4, calculating the negative peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L2 corresponding to the maximum value of the negative peak of the direct-coupled wave of each channel of data [ L ═ L1,…lm,…ln]The maximum value, the minimum value and the average value of the L2 are respectively represented by Max2, Min2 and M2, and the negative peak phase jitter of the direct-coupled wave Y2 is (Max2-Min 2)/M2;
step 5, calculating the positive peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L3 corresponding to the maximum value of the positive peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, the minimum value and the average value of the L3 are respectively represented by Max3, Min3 and M3, and the positive peak phase jitter of the reflected wave Y3 is (Max3-Min 3)/M3;
step 6, calculating the negative peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L4 corresponding to the maximum value of the negative peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, minimum value, and average value of L4 are represented by Max4, Min4, and M4, respectively, and the negative peak phase jitter Y4 of the reflected wave is (Max4-Min 4)/M4.
The evaluation method disclosed by the embodiment uses multi-channel data acquired by the array radar and combines an antenna phase jitter algorithm to calculate the positive peak phase jitter and the negative peak phase jitter of the direct coupling wave and the reflected wave of the multi-channel radar data, and can visually judge the size of the antenna phase jitter in the radar system.
Claims (1)
1. A method for evaluating phase jitter of a ground penetrating radar antenna is characterized by comprising the following steps:
step 1, acquiring radar data, connecting an antenna and a radar host machine by using a cable, placing the antenna on a foam body with the height being 2 times of the central frequency wavelength of the antenna, placing the foam body on a copper-clad plate with the height being 4 times of the central frequency wavelength of the antenna, overlapping the copper-clad plate and a central shaft of the antenna, and storing the acquired data, wherein the number of data tracks is more than 1000;
step 2, reading parameters of each original data, including sampling points, time windows, frequencies and track numbers, and shaving the front 200 tracks of data and the back 200 tracks of data of the original data;
step 3, calculating the positive peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L1 corresponding to the maximum value of the positive peak of the direct-coupled wave of each channel of data (L ═ L)1,…lm,…ln]The maximum value, the minimum value and the average value of the L1 are respectively represented by Max1, Min1 and M1, and the positive peak phase jitter of the direct-coupled wave is represented by Y1 ═ (Max1-Min 1)/M1;
step 4, calculating the negative peak phase jitter of the direct-coupled wave by using the data obtained in the step 2, and obtaining the number of sampling points L2 corresponding to the maximum value of the negative peak of the direct-coupled wave of each channel of data [ L ═ L1,…lm,…ln]The maximum value, the minimum value and the average value of the L2 are respectively represented by Max2, Min2 and M2, and the negative peak phase jitter of the direct-coupled wave Y2 is (Max2-Min 2)/M2;
step 5, calculating the positive peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L3 corresponding to the maximum value of the positive peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, the minimum value and the average value of the L3 are respectively represented by Max3, Min3 and M3, and the positive peak phase jitter of the reflected wave Y3 is (Max3-Min 3)/M3;
step 6, calculating the negative peak phase jitter of the reflected wave by using the data obtained in the step 2, and obtaining the number of sampling points L4 corresponding to the maximum value of the negative peak of the reflected wave of each channel of data as [ L [ ]1,…lm,…ln]The maximum value, minimum value, and average value of L4 are represented by Max4, Min4, and M4, respectively, and the negative peak phase jitter Y4 of the reflected wave is (Max4-Min 4)/M4.
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