CN114236251A - Satellite antenna tracking precision testing method - Google Patents
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- CN114236251A CN114236251A CN202111543473.2A CN202111543473A CN114236251A CN 114236251 A CN114236251 A CN 114236251A CN 202111543473 A CN202111543473 A CN 202111543473A CN 114236251 A CN114236251 A CN 114236251A
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- 238000010998 test method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
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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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Abstract
The application discloses a method for testing the tracking precision of a satellite antenna, which comprises the steps of setting a signal source, aligning the satellite antenna and tracking the signal source; illuminating the signal source with a light source which is arranged on the satellite antenna and is concentric with the satellite antenna; measuring the radius of a light ray track irradiated on the signal source by the light source; measuring the distance between the satellite antenna and the signal source; and calculating the tracking precision of the satellite antenna by using a formula theta (arctan) (R/L), wherein R is the ray track radius, and L is the distance. The method for testing the tracking precision of the satellite antenna can measure the tracking precision of the satellite antenna efficiently and accurately, and provides an accurate basis for parameter measurement of the satellite antenna.
Description
Technical Field
The invention belongs to the technical field of satellite antennas, and particularly relates to a method for testing the tracking precision of a satellite antenna.
Background
The ship-borne satellite antenna is a satellite antenna installed on a ship, can automatically search and track a target satellite, and continuously adjusts the posture of the antenna along with the movement of a ship body, so that the antenna is always aligned to the direction of the satellite, thereby ensuring the continuous transmission of signals. The tracking accuracy is an important technical index of the shipborne satellite antenna, the higher the tracking accuracy is, the stronger the capability of the antenna for locking the satellite is, the more accurate the satellite is aligned, the stronger the signal transmitted and received is, and the less interference is possibly generated to other satellites. Internationally, the tracking accuracy of a ship-borne satellite antenna is generally required to be within 0.2 degrees, but the tracking accuracy of the antenna is continuously adjusted, particularly on a moving carrier, a method for directly testing the tracking accuracy is not available in the prior art, and only a signal value received by the antenna can be measured through a frequency spectrograph, and then the fluctuation of the signal value is compared with an antenna directional diagram, so that the tracking accuracy of the antenna is indirectly obtained.
However, when the prior art is used for tracking accuracy testing, in the process that satellite signals pass through the atmosphere and are transmitted to the ground, dust, water mist and other suspended particles in the air all affect the satellite signals, so that signal fluctuation of about 0.2dB exists in the signal intensity received by the ground, and the signal fluctuation can seriously affect the calculation of the tracking accuracy.
Disclosure of Invention
In order to solve the problems, the invention provides a method for testing the tracking precision of a satellite antenna, which can efficiently and accurately measure the tracking precision of the satellite antenna and provide an accurate basis for parameter measurement of the satellite antenna.
The invention provides a satellite antenna tracking precision testing method, which comprises the following steps:
setting a signal source, aligning a satellite antenna and tracking the signal source;
illuminating the signal source with a light source which is arranged on the satellite antenna and is concentric with the satellite antenna;
measuring the radius of a light ray track irradiated on the signal source by the light source;
measuring the distance between the satellite antenna and the signal source;
and calculating the tracking precision of the satellite antenna by using a formula theta (arctan) (R/L), wherein R is the ray track radius, and L is the distance.
Preferably, in the satellite antenna tracking accuracy testing method, the signal source is a feed-forward parabolic antenna.
Preferably, in the satellite antenna tracking accuracy testing method, the light source is a laser generator.
Preferably, in the satellite antenna tracking accuracy testing method, the signal source is set to be placed on an antenna support with a preset height.
Preferably, in the satellite antenna tracking accuracy testing method, a preset distance is provided between the bottom end of the antenna support and the satellite antenna.
Preferably, in the satellite antenna tracking accuracy testing method, the preset height is 30 meters.
Preferably, in the satellite antenna tracking accuracy testing method, the preset distance is 64 meters to 100 meters.
Preferably, in the method for testing the tracking accuracy of the satellite antenna, before the setting of the signal source, the method further includes:
the radius of each concentric circle is pre-marked on the feed forward parabolic antenna.
Preferably, in the satellite antenna tracking accuracy testing method, the frequency of the signal source is set to be 10.70GHz to 14.5 GHz.
According to the above description, the method for testing the tracking accuracy of the satellite antenna provided by the invention comprises the steps of setting a signal source, aligning the satellite antenna and tracking the signal source; illuminating the signal source with a light source which is arranged on the satellite antenna and is concentric with the satellite antenna; measuring the radius of a light ray track irradiated on the signal source by the light source; measuring the distance between the satellite antenna and the signal source; the tracking precision of the satellite antenna is calculated by using a formula theta (R/L), wherein R is the radius of the ray track, and L is the distance, so that the method is a direct measurement method, signal measurement is not needed, and the method is not affected by signal interference caused by different external factors, so that the method can measure the tracking precision of the satellite antenna efficiently and accurately, and provides an accurate basis for parameter measurement of the satellite antenna.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of a method for testing tracking accuracy of a satellite antenna according to the present invention;
fig. 2 is a schematic diagram of a satellite antenna tracking precision test setup device.
Detailed Description
The core of the invention is to provide a method for testing the tracking precision of the satellite antenna, which can measure the tracking precision of the satellite antenna efficiently and accurately and provide accurate basis for the parameter measurement of the satellite antenna.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Fig. 1 shows an embodiment of a method for testing tracking accuracy of a satellite antenna, where fig. 1 is a schematic diagram of an embodiment of a method for testing tracking accuracy of a satellite antenna, and the method may include the following steps:
s1: setting a signal source, aligning a satellite antenna and tracking the signal source;
s2: irradiating a signal source along with the satellite antenna by using a light source which is arranged on the satellite antenna and is concentric with the satellite antenna;
s3: measuring the radius of a light ray track irradiated on a signal source by a light source;
s4: measuring the distance between the satellite antenna and the signal source;
s5: and calculating the tracking precision of the satellite antenna by using a formula theta (arctan) (R/L), wherein R is the ray track radius, and L is the distance.
It should be noted that, in the test process, the light source leaves a track at the position of the signal source along with the adjustment of the angle of the satellite antenna, and after the test is performed for a period of time, the tracks form an irradiation area, the periphery of the irradiation area corresponds to the maximum radius of the track, that is, the maximum deviation angle of the satellite antenna in the process of tracking the signal source, that is, the radius of the light ray track, and the tracking accuracy of the satellite antenna can be calculated by using the radius of the light ray track.
As can be seen from the above description, in the embodiment of the satellite antenna tracking accuracy testing method provided by the present invention, the signal source is set, and the satellite antenna is aligned to and tracks the signal source; irradiating a signal source along with the satellite antenna by using a light source which is arranged on the satellite antenna and is concentric with the satellite antenna; measuring the radius of a light ray track irradiated on a signal source by a light source; measuring the distance between the satellite antenna and the signal source; the satellite antenna tracking precision is calculated by using a formula theta (R/L), wherein R is the ray track radius and L is the distance, so that the method is a direct measurement method, signal measurement is not needed, and the influence of signal interference caused by different external factors is avoided.
In a specific embodiment of the satellite antenna tracking accuracy testing method, the signal source may preferably be a feed-forward parabolic antenna, which is a perfect circular parabolic antenna, and a concentric circle can be better drawn on the perfect circular parabolic antenna, so that the radius of the track can be better measured, and the antenna pattern has good symmetry. Of course, the method is not limited to this, and other types may be selected according to actual needs, for example, a horn antenna and a flat plate may be used to match each other, and a concentric radius may be drawn on the flat plate with the horn antenna as a center.
Further, the light source may be preferably a laser generator, and the linearity of the laser generated by the laser generator is better, so as to ensure that the measured result is more accurate, and of course, other types of light sources may be selected according to actual needs, and are not limited herein.
In the above embodiment, the signal source may be specifically set to be placed on the antenna bracket with a preset height, so that the reality of the analog signal source is better, and further, the preset height may be preferably 30 meters, which may be selected according to actual needs, and is not limited herein.
It will be understood by those skilled in the art that, in the satellite antenna tracking accuracy test method, the frequency of the signal source may be set to 10.70GHz to 14.5GHz, i.e., Ku band.
Furthermore, the bottom end of the antenna support may have a predetermined distance from the satellite antenna, which may preferably be 64 m to 100 m, although this is only a preferred embodiment, and the preferred value of the predetermined distance is related to the diameter and wavelength of the antenna, and the predetermined distance L is not less than 2 × D2And/λ, for example, for an 80cm antenna, a Ku band of 14.5GHz, and a wavelength of 20.7mm, calculating the preset distance to be not less than 62 m, if maintaining such a sufficient distance enables the satellite antenna to have a shaking angle with sufficient resolution when tracking a signal source, so as to further facilitate measurement of tracking accuracy, if the distance is too small, the angle is not large enough to be easily calculated, although the preset distance is not limited thereto, and other distances may be selected according to actual antenna parameters, and is not limited herein.
In another specific embodiment of the above method for testing tracking accuracy of a satellite antenna, before setting the signal source, the method may further include: the radius of each concentric circle is pre-marked on the feed forward parabolic antenna. Under the condition, the radius value corresponding to the maximum moving range of the tested laser track can be rapidly obtained, and the calculation of the tracking precision is more convenient.
The method is described below by using a specific example, and with reference to fig. 2, fig. 2 is a schematic diagram of a satellite antenna tracking accuracy test setup device.
The first step is as follows: the antenna support is erected in the open ground, the antenna support needs a certain height and can be a ready-made building, and the antenna support and the antenna to be measured should keep a certain distance;
the second step is that: using a standard positive feed parabolic antenna (a feedback type) as a measured antenna, drawing concentric circle scales on the measured antenna, and marking the radius of each concentric circle;
the third step: connecting a signal generator for the antenna to be tested, wherein the transmitting frequency is the frequency which can be received and locked by the antenna to be tested;
the fourth step: mounting a laser generator on the measured antenna to ensure that the emission direction of the laser generator is superposed with the central axis of the measured antenna;
the fifth step: starting the tested antenna, setting the tracking frequency as the frequency transmitted by the signal generator, and waiting for the tested antenna to lock the signal generator;
and a sixth step: starting a laser transmitter, and observing a track of laser irradiated on a signal generator;
the seventh step: recording the concentric circle scale corresponding to the maximum moving range of the laser track, and reading the radius R of the concentric circle;
eighth step: measuring the distance L between the antenna to be measured and the signal generator;
the ninth step: the tracking accuracy θ of the antenna is calculated to be arctan (R/L).
According to the test method provided by the invention, a high-precision angle measuring instrument is not needed, and the tracking precision of the antenna can be measured very accurately as long as a simple test environment is required to be established.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A satellite antenna tracking precision test method is characterized by comprising the following steps:
setting a signal source, aligning a satellite antenna and tracking the signal source;
illuminating the signal source with a light source which is arranged on the satellite antenna and is concentric with the satellite antenna;
measuring the radius of a light ray track irradiated on the signal source by the light source;
measuring the distance between the satellite antenna and the signal source;
and calculating the tracking precision of the satellite antenna by using a formula theta (arctan) (R/L), wherein R is the ray track radius, and L is the distance.
2. The method for testing the tracking accuracy of the satellite antenna according to claim 1, wherein the signal source is a feed-forward parabolic antenna.
3. The method for testing the tracking accuracy of the satellite antenna according to claim 1, wherein the light source is a laser generator.
4. The method for testing the tracking accuracy of the satellite antenna according to claim 1, wherein the signal source is set to be placed on an antenna support with a preset height.
5. The method for testing the tracking accuracy of the satellite antenna according to claim 4, wherein a preset distance is provided between the bottom end of the antenna support and the satellite antenna.
6. The method according to claim 4, wherein the predetermined height is 30 m.
7. The method for testing the tracking accuracy of the satellite antenna according to claim 5, wherein the preset distance is 64 m to 100 m.
8. The method for testing the tracking accuracy of the satellite antenna according to claim 2, wherein before the signal source is set, the method further comprises:
the radius of each concentric circle is pre-marked on the feed forward parabolic antenna.
9. The method according to claim 1, wherein the frequency of the signal source is set to 10.70GHz to 14.5 GHz.
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| CN202111543473.2A CN114236251A (en) | 2021-12-16 | 2021-12-16 | Satellite antenna tracking precision testing method |
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| CN202111543473.2A CN114236251A (en) | 2021-12-16 | 2021-12-16 | Satellite antenna tracking precision testing method |
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| CN114236251A true CN114236251A (en) | 2022-03-25 |
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2021
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