CN115561529A - Performance detection method of antenna feeder system - Google Patents
Performance detection method of antenna feeder system Download PDFInfo
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- CN115561529A CN115561529A CN202210962795.9A CN202210962795A CN115561529A CN 115561529 A CN115561529 A CN 115561529A CN 202210962795 A CN202210962795 A CN 202210962795A CN 115561529 A CN115561529 A CN 115561529A
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Abstract
The invention discloses a performance detection method of an antenna feeder system, which solves the problem that the real-time performance cannot be realized because the antenna feeder system needs to be closed when the antenna feeder system is detected in the prior art, and comprises the following steps: s1: detecting the original performance parameters of an antenna in an antenna feed system; s2: detecting the original performance parameters of a jumper in an antenna feed system; s3: assembling an antenna feeder system, and recording assembly parameters of the antenna feeder system; s4: detecting the coverage performance of an antenna feeder system and the network transmission quality; s5: and according to the performance detection result in the step S4, alarming and maintaining the antenna feeder system. The antenna and the jumper wire can be detected before the antenna feeder system is put into use, and the antenna feeder system in use can be detected in real time.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a performance detection method of an antenna feed system.
Background
An antenna feed system is a system in which an antenna radiates electromagnetic waves to a surrounding space, and is an important component of a mobile communication system, and an antenna feed system of a mobile base station generally includes: the system comprises an antenna for receiving and transmitting wireless signals, a feeder line connected between the antenna and receiving equipment in a machine room, a jumper wire, a coupler, a power amplifier, a duplexer, a lightning protector, signal processing equipment, joints among various devices and cables, grounding of various devices and cables and the like. The jumper wire is composed of a radio frequency coaxial cable and left and right end connectors, is suitable for connecting the base station antenna to a main feeder or a tower amplifier, a main feeder or an antenna feeder arrester and base station transceiving equipment, and is connected with the equipment, and the main working frequency range of the jumper wire is 5 MHz-5800 MHz.
The performance of the antenna feeder system directly affects the quality of signals transmitted and received by the mobile terminal user, and therefore, the performance of the antenna feeder system needs to be periodically detected to ensure that the performance of the antenna feeder system is good and avoid causing great influence on the use of the mobile terminal user.
In the prior art, an antenna or a feeder line is mostly detected before an antenna feeder system is installed, and the antenna or the feeder line is put into use after the detection is qualified, but the system performance cannot be detected in the antenna feeder system in use, and even if the antenna feeder system can be detected, only a specially-assigned person can be sent to a site to carry a special instrument, and the antenna feeder system is disassembled section by section for detection. On one hand, real-time detection cannot be carried out, and only temporary maintenance is carried out; on the other hand, the antenna feeder system stops being used during detection, and information transmission is influenced.
Disclosure of Invention
The invention aims to solve the problem that the antenna feeder system cannot be closed in real time when the antenna feeder system is detected in the prior art, and provides a performance detection method of the antenna feeder system, which can detect an antenna and a feeder line before the antenna feeder system is put into use and can detect the antenna feeder system in use in real time.
In order to achieve the purpose, the invention adopts the following technical scheme: a performance detection method of an antenna feed system comprises the following steps:
s1: detecting the original performance parameters of an antenna in an antenna feed system;
s2: detecting the original performance parameters of jumper wires in the antenna feeder system;
s3: assembling an antenna feeder system, and recording assembly parameters of the antenna feeder system;
s4: detecting the coverage performance of an antenna feeder system and the network transmission quality;
s5: and according to the performance detection result in the step S4, alarming and maintaining the antenna feeder system.
The antenna and the feeder can be detected before the antenna feeder system is put into use, the running state of the antenna feeder system can be monitored in real time while the antenna feeder system runs normally, abnormal information can be monitored in real time when the antenna feeder system is abnormal, active warning is carried out, and a worker is reminded to maintain the antenna feeder system in time, so that normal communication is guaranteed.
Preferably, the step S1 is further represented as:
s1.1: measuring the electrical properties of the antenna, including far field measurements, near field detection, and circuit parameter measurements;
s1.2: measuring the structure of the antenna;
s1.3: the environmental resistance of the antenna is measured.
When the structure of the antenna is measured, the method can be used for verifying whether the materials, the external dimensions, the structural design and the processing have problems by using an algorithm of checking, visual inspection and machinery. Measuring the circuit parameter includes: standing wave ratio measurement, isolation measurement, intermodulation measurement, and power margin measurement.
Preferably, in step S1.1, the specific steps when performing far-field measurement are:
a1: vertically installing the antenna to be measured, and recording a first horizontal plane homopolar directional diagram FH (phi) and a first cross polar directional diagram fH1 (phi) of the antenna to be measured;
a2: selecting a maximum receiving level value H1 and an angle phi 1 thereof in a first horizontal plane homopolarity directional diagram FH (phi), finding a point phi 2 with n dB of level drop from a maximum receiving level point to the positive direction, finding a point phi 3 with n dB of level drop to the negative direction, finding a receiving level value H2 at + alpha degree, finding a maximum receiving level value H4 in a range of-alpha degree receiving level value H3 and-180 +/-beta degree, selecting an axial receiving level H5 in the first cross polarity directional diagram fH1 (phi), finding a maximum receiving level value H6 in a range of-180 +/-beta degree, and calculating a horizontal plane radiation parameter;
a3: changing a polarization port, repeating the steps A1-A2 to obtain a second horizontal plane homopolarity directional diagram FH2 (phi) and a second cross polarization directional diagram fH2 (phi), and calculating directional diagram consistency and directional diagram roundness;
a4: horizontally installing a measured antenna, aligning the normal line of the measured antenna to a source antenna in a forward direction, aligning the normal line of the measured antenna to the source antenna in the same polarization, and recording a vertical plane same polarization directional diagram FV (phi) of the antenna;
a5: in directional diagram FV (theta) data, finding out the axial maximum receiving level V1 and angle phi 1 of the antenna, finding out the point phi 2 where the level is decreased by n dB from the maximum receiving level point to the positive direction, finding out the point phi 3 where the level is decreased by n dB to the negative direction, and calculating the radiation parameter of the vertical surface;
a6: and (4) replacing the polarization ports, repeating the steps A5-A6, and calculating the gain of each polarization.
In step A2, the vertical plane radiation parameters include: horizontal plane half-power beam width θ n dB = Φ 2- Φ 3; horizontal plane beam pointing angle θ t = (Φ 2+ Φ 3)/2; primary direction inclination = θ t/θ n dB; + α ° edge power down = (H1-H2); - α ° edge power drop = (H1-H3); main polarization front-to-back ratio F/B = H1-H4; horizontal plane gain GH = G0+ (H1-Ps) + N; wherein G0 is the gain (dBi) of the standard gain antenna, and N is the corrected value (dB) of the path attenuation from the receiver input end to the antenna under test and the output end of the standard gain antenna.
Further comprising: axial cross-polarization ratio = FH (0) -FH1 (0); the cross-polarization ratio = Min (FH (θ) -FH1 (θ)) in the range of ± α ° (± β °).
In step A3, direction diagram consistency = Max [ | FH1 (θ) -FH2 (θ) | ] within ± α °; directional diagram roundness = ± (H7-H8)/2, where H7 is the maximum value in the test data, and H8 is the minimum value in the test data.
The antenna gain is: gain per polarization G = Max [ GH, GV ], where GH represents horizontal plane gain and GV represents vertical plane gain.
Preferably, in step S1.1, the specific steps when performing far-field measurement are:
b1: vertically installing a standard gain antenna, setting the gain and frequency points of the standard gain antenna, and completing a gain calibration test by using the standard gain antenna; cross-polarization front-to-back ratio F/B = H1-H6; the front-to-back ratio of the dual-polarized antenna = Min [ (H1-H4), (H1-H6) ].
B2: installing the antenna to be measured, measuring and storing electromagnetic field distribution data;
b3: and calculating the gain of the antenna to be measured and the three-dimensional directional diagram parameters according to the standard gain antenna and the test data of the antenna to be measured by using a near-field far-field transformation algorithm.
Gain refers to the ratio of the radiation power flux density of the antenna in a specified direction to the maximum radiation power flux density of a reference antenna at the same input power. Directional diagram consistency refers to the deviation value of the horizontal plane absolute value directional diagram of the dual-polarized antenna, and the edges (within +/-60 degrees) in the sectors of the two polarization absolute value directional field diagrams at the same frequency and the same downward inclination angle. The gain is calculated using the formula G = G0+ (P2-P1), where G0 is the gain of the standard gain antenna, P1 is the maximum level obtained by the standard gain antenna test, and P2 is the maximum level obtained by the AUT test.
Preferably, in step S1.3, the environmental tolerance measurement includes: respectively measuring standing wave ratio, isolation and intermodulation of the antenna under the conditions of high temperature, low temperature, high and low temperature circulation, constant damp and heat, alternating damp and heat, vibration and collision; and respectively detecting the deformation quantity of the antenna under the conditions of free fall, wind load and ultraviolet rays. The method also comprises the steps of antenna joint tension measurement, waterproof measurement, salt fog measurement, mould measurement, sand measurement, lightning protection measurement and the like.
Preferably, the step S2 is further expressed as:
s2.1: detecting physical parameters of the jumper;
s2.2: and detecting the electrical parameters of the jumper, including the insulation resistance of the jumper, the voltage withstanding between the inner conductor and the outer conductor, the voltage standing wave ratio, the insertion loss, the voltage withstanding between the inner conductor and the outer conductor and the third-order intermodulation.
Third order intermodulation interference refers to a passive intermodulation signal with an order of three that falls within the operating receive frequency range. The jumper wire detection standards of different specifications are different, the jumper wire detection method only needs to detect, and the jumper wire detection method can judge according to the corresponding specification standard during judgment. When physical parameters are detected, the method mainly detects whether the outer surface of the coaxial cable of the jumper is smooth and flat, and has no defects of holes, cracks, bubbles, depressions and the like; whether the surface of the connector is bright, non-oxidized, non-black spot, non-sand hole, non-burr, non-crack and non-obvious gouge; whether the whole jumper wire has no mechanical damage or not. It is also necessary to measure jumper connector wrench face length. The above detection can be carried out by using the existing instrument.
Preferably, in step S4, the specific steps of detecting the coverage performance of the antenna feeder system are as follows:
c1: determining a detection node, and determining the position of the detection node, the signal coverage strength of the detection node and the position of an antenna feed system;
c2: judging whether the detection node is in the coverage range of the antenna feed system or not according to the signal coverage strength of the detection node, if so, executing a step C3;
c3: calculating an actual direction angle m1 of the antenna feed system, comparing the actual direction angle m1 with the theoretical direction angle m2 recorded in the step S3, and judging whether a direction angle difference value between the m1 and the m2 is greater than a preset threshold value or not;
c4: and C1-C3 are repeated, w different detection nodes are determined, and if the direction angle difference values of x detection nodes are all larger than a preset threshold value, the problem of coverage performance of the antenna feed system is shown.
The detection node is the same as the main service area corresponding to the antenna feed system.
Preferably, in step S4, the specific step of detecting the network transmission quality of the antenna feeder system is as follows:
d1: establishing a signal transmission model from a source node to a terminal node of an antenna feed system, wherein the signal transmission model takes a signal sent from the source node to the terminal node as input and a signal received by the terminal node as output;
d2: detecting a transmitting signal transmitted from a source node to a tail end node of an antenna feed system in real time, and inputting the detected transmitting signal to a signal transmission model to obtain a theoretical receiving signal;
d3: and comparing the theoretical received signal with the actual received signal received by the actual end node, and if the difference value exceeds a preset threshold value, indicating that the transmission quality of the antenna feed system network has a problem.
Therefore, the invention has the following beneficial effects: 1. the antenna and the jumper wire can be detected before the antenna feeder system is put into use, and the antenna and the feeder wire which are qualified in detection are put into use, so that the problem of the antenna feeder system just before the antenna feeder system is put into use is prevented, and the stable operation of the antenna feeder system is ensured; 2. the method and the system have the advantages that the running state of the antenna feeder system can be monitored in real time when the antenna feeder system runs normally, abnormal information can be monitored in real time when the antenna feeder system is abnormal, active warning is given, a worker is reminded of maintaining the antenna feeder system in time, and normal communication is guaranteed.
Drawings
FIG. 1 is a flow chart of the operation of the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and embodiments:
in the embodiment shown in fig. 1, a method for detecting performance of an antenna feeder system can be seen, which comprises the following steps: detecting the original performance parameters of an antenna in an antenna feed system; step two, detecting the original performance parameters of jumper wires in the antenna feed system; step three, assembling the antenna feeder system, and recording assembly parameters of the antenna feeder system; step four, detecting the coverage performance of the antenna feeder system and the network transmission quality; and step five, alarming and maintaining the antenna feeder system according to the performance detection result in the step four. The antenna feeder system can detect the antenna and the feeder line before the antenna feeder system is put into use, can monitor the running state of the antenna feeder system in real time while the antenna feeder system runs normally, can monitor abnormal information in real time when the antenna feeder system is abnormal, and can actively give an alarm to remind a worker to maintain the antenna feeder system in time so as to ensure normal communication.
The concrete expression is as follows:
the first step is as follows: detecting the original performance parameters of an antenna in an antenna feed system
1. Measuring electrical properties of an antenna, including far field measurements, near field sensing, and circuit parameter measurements
In this example, N =3, α is 60 degrees, and β is 30 degrees.
a: far field measurement
Vertically installing the antenna to be measured, and recording a first horizontal plane homopolar directional diagram FH (phi) and a first cross polar directional diagram fH1 (phi) of the antenna to be measured; selecting a maximum receiving level value H1 and an angle phi 1 thereof in a first horizontal plane homopolar directional diagram FH (phi), finding a point phi 2 with 3dB level reduction from a maximum receiving level point to a positive direction, finding a point phi 3 with 3dB level reduction from a negative direction, finding a receiving level value H2 at +60 degrees, finding a maximum receiving level value H3 at-60 degrees, finding a maximum receiving level value H4 in a range of 180 degrees +/-30 degrees, selecting an axial receiving level H5 in a first cross polar directional diagram fH1 (phi), finding a maximum receiving level value H6 in a range of 180 degrees +/-30 degrees, and calculating a horizontal plane radiation parameter:
horizontal half-power beamwidth θ 3dB = Φ 2- Φ 3;
horizontal plane beam pointing angle θ t = (Φ 2+ Φ 3)/2;
primary direction inclination = θ t/θ 3dB;
+60 ° edge power down = (H1-H2);
-60 ° edge power drop = (H1-H3);
main polarization front-to-back ratio F/B = H1-H4;
gain GH = G0+ (H1-Ps) + N in the horizontal plane, wherein G0 is the gain (dBi) of the standard gain antenna, and N is the corrected value (dB) of the path attenuation from the receiver input end to the tested antenna and the standard gain antenna output end respectively;
axial cross-polarization ratio = FH (0) -FH1 (0);
cross-polarization ratio = Min (FH (θ) -FH1 (θ)) in the range of ± 60 ° (± 30 °);
cross-polarization front-to-back ratio F/B = H1-H6;
the front-to-back ratio of the dual-polarized antenna = Min [ (H1-H4), (H1-H6) ].
Changing a polarization port, repeating the steps A1-A2 to obtain a second horizontal plane homopolarity directional diagram FH2 (phi) and a second cross polarization directional diagram fH2 (phi), and calculating directional diagram consistency and directional diagram roundness:
pattern consistency = Max [ | FH1 (θ) -FH2 (θ) | ], within ± 60 °;
pattern circularity = ± (H7-H8)/2, where H7 denotes a maximum level value and H8 denotes a minimum level value.
The method comprises the following steps that a measured antenna is horizontally installed, the normal line of the measured antenna is aligned to a source antenna in the positive direction and is aligned to the same polarization of the source antenna, and a vertical plane same polarization directional diagram FV (phi) of the antenna is recorded; in directional diagram FV (theta) data, finding out the maximum receiving level V1 and angle phi 1 of the antenna axial direction, finding out the point phi 2 of 3dB drop of the level from the maximum receiving level point to the positive direction, finding out the point phi 3 of 3dB drop of the level to the negative direction, and calculating the radiation parameter of the vertical surface:
the vertical plane half-power beam width theta 3dB = phi 2-phi 3;
the vertical plane beam pointing angle θ t = (Φ 2+ Φ 3)/2;
upper sidelobe suppression = V1-V2, V2 representing a maximum level value;
vertical plane gain GV = G0+ (V1-Ps) + N.
Changing polarization ports, repeating the steps A5-A6, calculating the gain of each polarization:
g = Max [ GH, GV ], GH denotes the level gain.
b: near field measurement
Vertically installing a standard gain antenna, setting the gain and frequency points of the standard gain antenna, and completing a gain calibration test by using the standard gain antenna; installing the antenna to be measured, measuring and storing electromagnetic field distribution data; and calculating the gain of the antenna to be measured and the three-dimensional directional diagram parameters according to the standard gain antenna and the test data of the antenna to be measured by using a near-field far-field transformation algorithm.
Gain using the formula: g = G0+ (P2-P1) calculation, where G0 is the gain of the standard gain antenna, P1 is the maximum level obtained by the standard gain antenna test, and P2 is the maximum level obtained by the AUT test.
c: circuit parameter measurement
Including standing wave ratio measurements, isolation measurements, intermodulation measurements, and power margin measurements.
2. Measuring the structure of an antenna
When the structure of the antenna is measured, the method of checking calculation, visual observation and machinery can be used for verifying whether the materials, the external dimensions, the structural design and the processing have problems.
3. Measuring environmental tolerance of an antenna
Respectively measuring standing wave ratio, isolation and intermodulation of the antenna under the conditions of high temperature, low temperature, high and low temperature circulation, constant damp and heat, alternating damp and heat, vibration and collision; and respectively detecting the deformation quantity of the antenna under the conditions of free fall, wind load and ultraviolet rays. The method also comprises the steps of antenna joint tension measurement, waterproof measurement, salt spray measurement, mold measurement, sand measurement, lightning protection measurement and the like.
Specifically, as in the constant moist heat test:
firstly, carrying out performance test on the antenna to be tested under the condition of normal temperature; placing the antenna at normal temperature into a test chamber, keeping the temperature of the test chamber at 25 +/-3 ℃, keeping the relative humidity at 45% -75%, enabling the temperature of the antenna to be stable, increasing the humidity to be not less than 95% within 1 hour, and then changing the temperature within 24 hours to form a cycle; taking the test antenna out of the test box, keeping the test antenna at the normal temperature for 1 hour, and removing moisture on the surface of the test antenna by using a rag; and immediately carrying out performance detection after the antenna returns to the normal temperature.
The second step is that: detecting the original performance parameters of jumper in antenna feed system
1. Detecting physical parameters of jumper wires
When physical parameters are detected, the method mainly detects whether the outer surface of the coaxial cable of the jumper is smooth and flat, and has no defects of holes, cracks, bubbles, depressions and the like; whether the surface of the connector is bright, non-oxidized, non-black spot, non-sand hole, non-burr, non-crack and non-obvious gouge; whether the whole jumper wire has no mechanical damage or not. It is also necessary to measure jumper connector wrench face length. The above detection can be carried out by using the existing instrument. For example, the jumper connector wrench face length may be detected using a vernier caliper.
2. Detecting the electrical parameters of the jumper including insulation resistance, voltage resistance between the inner and outer conductors, voltage standing wave ratio, insertion loss, voltage resistance between the inner and outer conductors, and third-order intermodulation
The above detection can be carried out by using the existing instrument. For example, an insulation resistance tester is used for detecting the insulation resistance of a jumper, and the method comprises the following specific steps: measuring and recording the length of the jumper wire; setting the test voltage of the insulation resistance tester to be DC 500V, measuring the insulation resistance after stabilizing for 60s +/-5 s, and recording the measured value; according to the formula: insulation resistance = sample length (km) × insulation resistance measurement value (M Ω) the test results were calculated.
The third step: assembling antenna feeder system, recording assembling parameters of antenna feeder system
Including the position of the antenna feed system, the antenna azimuth, the downtilt, the transmit power, the coverage distance, etc.
The fourth step: detection of antenna feeder system coverage performance and network transmission quality
1. Measurement of coverage Performance
The specific steps for detecting the coverage performance of the antenna feed system are as follows:
c1: determining a detection node, and determining the position of the detection node, the signal coverage strength of the detection node and the position of an antenna feed system;
c2: judging whether the detection node is in the coverage range of the antenna feed system or not according to the signal coverage strength of the detection node, if so, executing the step C3;
c3: calculating an actual direction angle m1 of the antenna feed system, comparing the actual direction angle m1 with the theoretical direction angle m2 recorded in the step S3, and judging whether a direction angle difference value between the m1 and the m2 is larger than a preset threshold value or not;
c4: and C1-C2 are repeated, w different detection nodes are determined, and if the direction angle difference values of x detection nodes are all larger than a preset threshold value, the problem of coverage performance of the antenna feed system is shown.
2. Network transmission quality detection
Establishing a signal transmission model from a source node to a terminal node of an antenna feed system, wherein the signal transmission model takes a signal sent from the source node to the terminal node as input and a signal received by the terminal node as output; detecting a transmitting signal transmitted from a source node to a tail end node of an antenna feed system in real time, and inputting the detected transmitting signal to a signal transmission model to obtain a theoretical receiving signal; and comparing the theoretical received signal with the actual received signal received by the actual end node, and if the difference exceeds a preset threshold, indicating that the network transmission quality of the antenna feed system has a problem.
The fifth step: according to the performance detection result in the fourth step, alarming is carried out and the antenna feeder system is maintained
For example, adjusting the azimuth angle of the antenna can reduce or increase the overlapping coverage area, accurately cover, increase the received signal strength of the area needing to be covered, and the like. The coverage area can be enlarged or reduced by adjusting the mechanical downward inclination angle of the antenna, the received signal strength of the coverage area is increased, the cross-zone coverage is avoided, and the blind zone is eliminated. Adjusting the antenna transmit power may increase or decrease the coverage area, increase the received signal strength in the coverage area, avoid cross-area coverage, etc.
Through the antenna feeder system and the method, on one hand, the antenna and the jumper wire can be detected before the antenna feeder system is put into use, the qualified antenna and the qualified feeder wire are detected and put into use, and the problem that occurs when the antenna feeder system is just put into use is prevented. On the other hand, the antenna feeder system in use can be detected in real time, the antenna feeder system does not need to be closed, and the practicability is higher.
The above-described embodiment is a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A performance detection method of an antenna feed system is characterized by comprising the following steps:
s1: detecting the original performance parameters of an antenna in an antenna feed system;
s2: detecting the original performance parameters of jumper wires in the antenna feeder system;
s3: assembling an antenna feeder system, and recording assembly parameters of the antenna feeder system;
s4: detecting the coverage performance of an antenna feeder system and the network transmission quality;
s5: and according to the performance detection result in the step S4, alarming and maintaining the antenna feeder system.
2. The method for detecting the performance of the antenna feed system according to claim 1, wherein the step S1 is further expressed as:
s1.1: measuring the electrical performance of the antenna, including far field measurement, near field detection and circuit parameter measurement;
s1.2: measuring the structure of the antenna;
s1.3: the environmental resistance of the antenna is measured.
3. The method for detecting the performance of the antenna feed system according to claim 2, wherein in the step S1.1, the specific steps of performing far-field measurement are as follows:
a1: vertically installing the antenna to be measured, and recording a first horizontal plane homopolarity directional diagram FH (phi) and a first cross-polarization directional diagram fH1 (phi) of the antenna to be measured;
a2: selecting a maximum receiving level value H1 and an angle phi 1 thereof in a first horizontal plane homopolar directional diagram FH (phi), finding a level drop n dB point phi 2 from a maximum receiving level point to a positive direction, finding a level drop n dB point phi 3 to a negative direction, finding a + alpha degree receiving level value H2, finding a maximum receiving level value H4 in a range of-alpha degree receiving level value H3 and-180 +/-beta degree, selecting an axial receiving level H5 in a first cross polar directional diagram fH1 (phi), finding a maximum receiving level value H6 in a range of-180 +/-beta degree, and calculating horizontal plane radiation parameters;
a3: changing a polarization port, repeating the steps A1-A2 to obtain a second horizontal plane homopolarity directional diagram FH2 (phi) and a second cross polarization directional diagram fH2 (phi), and calculating directional diagram consistency and directional diagram roundness;
a4: the method comprises the following steps that a measured antenna is horizontally installed, the normal line of the measured antenna is aligned to a source antenna in the positive direction and is aligned to the same polarization of the source antenna, and a vertical plane same polarization directional diagram FV (phi) of the antenna is recorded;
a5: in directional diagram FV (theta) data, finding out the axial maximum receiving level V1 and angle phi 1 of the antenna, finding out the point phi 2 where the level is decreased by n dB from the maximum receiving level point to the positive direction, finding out the point phi 3 where the level is decreased by n dB to the negative direction, and calculating the radiation parameter of the vertical surface;
a6: and (4) replacing the polarization ports, repeating the steps A5-A6, and calculating the gain of each polarization.
4. A method as claimed in claim 2 or 3, wherein in step S1.1, the specific steps for performing far-field measurement are as follows:
b1: vertically installing a standard gain antenna, setting the gain and frequency points of the standard gain antenna, and completing a gain calibration test by using the standard gain antenna;
b2: installing the antenna to be measured, measuring and storing the electromagnetic field distribution data;
b3: and calculating the gain of the antenna to be tested and the three-dimensional directional diagram parameters according to the standard gain antenna and the test data of the antenna to be tested by utilizing a near-field far-field transformation algorithm.
5. A method for detecting the performance of an antenna feed system according to claim 2 or 3, characterized in that in step S1.3, the environmental tolerance measurement comprises: respectively measuring standing wave ratio, isolation and intermodulation of the antenna under the conditions of high temperature, low temperature, high and low temperature circulation, constant damp and heat, alternating damp and heat, vibration and collision; and respectively detecting the deformation quantity of the antenna under the conditions of free fall, wind load and ultraviolet rays.
6. The method for detecting performance of an antenna feed system according to claim 1, wherein the step S2 is further expressed as:
s2.1: detecting physical parameters of the jumper;
s2.2: and detecting electrical parameters of the jumper, wherein the electrical parameters comprise jumper insulation resistance, voltage withstanding between the inner conductor and the outer conductor, voltage standing wave ratio, insertion loss, voltage withstanding between the inner conductor and the outer conductor and third-order intermodulation.
7. The method for detecting the performance of the antenna feeder system according to claim 1, wherein the step S4 of detecting the coverage performance of the antenna feeder system comprises the specific steps of:
c1: determining a detection node, and determining the position of the detection node, the signal coverage strength of the detection node and the position of an antenna feed system;
c2: judging whether the detection node is in the coverage range of the antenna feed system or not according to the signal coverage strength of the detection node, if so, executing the step C3;
c3: calculating an actual direction angle m1 of the antenna feed system, comparing the actual direction angle m1 with the theoretical direction angle m2 recorded in the step S3, and judging whether a direction angle difference value between the m1 and the m2 is larger than a preset threshold value or not;
c4: and C1-C3 are repeated, w different detection nodes are determined, and if the direction angle difference values of x detection nodes are all larger than a preset threshold value, the problem of coverage performance of the antenna feed system is shown.
8. The method for detecting performance of an antenna feeder system according to claim 1 or 7, wherein in the step S4, the specific steps for detecting the network transmission quality of the antenna feeder system are as follows:
d1: establishing a signal transmission model from a source node to a terminal node of an antenna feed system, wherein the signal transmission model takes a signal sent from the source node to the terminal node as input and a signal received by the terminal node as output;
d2: detecting a transmitting signal transmitted from a source node to a tail end node of an antenna feed system in real time, and inputting the detected transmitting signal to a signal transmission model to obtain a theoretical receiving signal;
d3: and comparing the theoretical received signal with the actual received signal received by the actual end node, and if the difference value exceeds a preset threshold value, indicating that the transmission quality of the antenna feed system network has a problem.
Priority Applications (1)
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| CN117517847A (en) * | 2024-01-04 | 2024-02-06 | 南京纳特通信电子有限公司 | Miniaturized movable K-band broadband radiation testing system and method |
| CN117517847B (en) * | 2024-01-04 | 2024-04-09 | 南京纳特通信电子有限公司 | Miniaturized movable K-band broadband radiation testing system and method |
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