CN103217596A - Ground verification method of performance of double-circle polarized multiplexed satellite-borne data transmission antenna - Google Patents
Ground verification method of performance of double-circle polarized multiplexed satellite-borne data transmission antenna Download PDFInfo
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Abstract
The invention provides a ground verification method of the performance of a double-circle polarized multiplexed satellite-borne data transmission antenna. A testing system used by the ground verification method comprises a satellite system and a ground system. The ground verification method comprises the following steps: first, the decrement of an attenuator is calculated according to the distance between a satellite system and a ground system and the actual working condition of a satellite in an orbit; mutual directing and aiming are conducted on the satellite-borne double-circle polarized multiplexed data transmission antenna and a ground receiving antenna; a ground verification simulation test is conducted, the satellite and ground combination polarization detectability of a channel one and a channel two and the link margin of the channel one and the channel two are measured, the directing angle of the satellite-borne double-circle polarized multiplexed data transmission antenna and the directing angle of the ground receiving antenna are pulled to be slanting, the satellite and ground combination polarization detectability and the link margin are measured when the directing angles are pulled to be slanting, and further an antenna directing accuracy which meets the demands of a link can be measured. According to the ground verification method of the performance of the double-circle polarized multiplexed satellite-borne data transmission antenna, comprehensive ground verification to the double-circle polarized multiplexed satellite-borne data transmission antenna can be achieved, a basis is provided for in-orbit operation, and risks of the in-orbit operation are reduced.
Description
Technical field
The present invention relates to a kind of ground validation method, be specifically related to the ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization, belong to the big System Test Technic of satellite field.
Background technology
Improve constantly and the continuous growth of user's request the data volume dramatic growth of satellite useful load along with the remote sensing satellite technology.For current widely used X-band star ground data transmission system, the available bandwidth of International Telecommunication Association's regulation only is the 375MHz in 8025MHz to the 8400MHz scope.For the transmission that makes load data can be satisfied this predetermined restricted, some novel remote sensing satellites have proposed to use the double-circle polarization channeling to count the scheme of teach skill art.Double-circle polarization channeling technology is meant the satellite load data is divided into two passages and is radiated to the ground receiving station by different polarization that two kinds of polarization are generally right-handed circular polarization and left-hand circular polarization.Since mutually orthogonal between two kinds of polarization, therefore the data of two passages can be transmitted in same frequency domain and same time domain, thereby made full use of limited radio frequency bandwidth, improved the efficient of star ground data transmission greatly.
For realizing the multiplexing star ground data transmission of double-circle polarization, on star, the number of delivering a letter of two-way radio frequency number is fed to the electromagnetic wave signal that polarization diplexer forms dextrorotation and left-hand circular polarization respectively, and by the satellite-borne data transmission aerial radiation to the ground receiving station.Wherein, the satellite-borne data transmission antenna adopts the scheme of mechanical type spot beam double-circle polarization multiplex antenna at present usually.The beam angle of this antenna main lobe is narrower, therefore need calculate the angle of antenna direction ground receiving station in real time by spaceborne control computer and servo controller according to time, track, the attitude information of satellite, and the control antenna rotation, realize accurate sensing to the ground receiving station.
Pass system for the star ground number that passes antenna based on the double-circle polarization multiplexing number, polarization resolution, link margin are united in star ground, pointing accuracy has directly determined satellite performance in orbit to performances such as link influences, need via satellite to dock test with ground receiving station wireless above-mentioned performance is carried out comprehensive ground validation.
The ground validation method of number biography antenna all designs at shaped aerial basically at present.Carry out wireless the butt joint when testing in satellite and ground receiving station, only link circuit condition is carried out qualitative checking, can't unite performance index such as polarization resolution, link margin in quantitative measurment star ground, and the wave beam broad of shaped aerial, there be not the problem of pointing accuracy to the link influence.
Summary of the invention
In view of this, the invention provides the ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization, what can be applied to satellite and ground receiving station wirelessly docks test.
The ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization, the test macro that this ground validation method adopts comprises satellite system and ground system; In satellite system, modulator a and modulator b receive the two-way pseudo-random code that PN code generator a and PN code generator b send here respectively, and it is modulated form the two-way radiofrequency signal, the two-way radiofrequency signal is carried out power attenuation by attenuator a and attenuator b respectively, both output signals input to spaceborne double-circle polarization multiplexing number biography antenna as passage 1 and passage 2 signals respectively, form the multiplexing radio frequency signal of double-circle polarization, and it is radiated to ground system; Wherein passage 1 is right-handed circular polarization, and passage 2 is left-hand circular polarization, and controls the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller;
In ground system, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes the multiplexing radio frequency signal of double-circle polarization that aerial radiation goes out, and the signal of two passages separated form independently passage 1 and passage 2 signals, delivering to low noise amplifier a and low noise amplifier b respectively carries out after low noise amplifies, deliver to low-converter a and low-converter b and carry out down coversion respectively, passage 1 signal of finishing down coversion is divided into two-way by power splitter a, one the road delivers to detuner a carries out demodulation, another road is delivered to frequency spectrograph a and is carried out spectrum measurement, passage 2 signals of finishing down coversion are divided into two-way by power splitter b, one the road delivers to detuner b carries out demodulation, and another road is delivered to frequency spectrograph b and carried out spectrum measurement;
Its ground validation method concrete steps are as follows:
The 1st step: in rail real work situation, calculate the damping capacity of attenuator a and attenuator b according to the distance between satellite system and the ground system and satellite; When satellite when rail is crossed the top, the damping capacity of two attenuators is made as L
1, when satellite was positioned at 5 ° of elevations angle of land station at rail, the damping capacity of two attenuators was made as L
2
The 2nd step: spaceborne double-circle polarization multiplexing number passed to point to mutually between antenna and the terrestrial receiving antenna aim at;
The 3rd step: carry out the ground validation simulation test, and the star ground of measuring passage 1 and passage 2 respectively unites polarize resolution and link margin, specifically comprise:
(1) the polarization resolution is united on the star ground of measuring passage 1 and passage 2, is specially:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is made as L
1, modulator b is in off-mode, and the passage 1 that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive and the carrier power of passage 2 are designated as A1 and A2 respectively;
2. by modulator b emission single-carrier signal, the damping capacity of attenuator b also is made as L
1, modulator a is in off-mode, and the passage 1 that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive and the carrier power of passage 2 are respectively B2 and B1;
3. the carrier power that 1. 2. obtains with step according to step, then to unite the polarization resolution be A1-B2 on the star ground of passage 1, it is B1-A2 that the resolution that polarizes is united on the star ground of passage 2;
(2) link margin of two passages of measurement is specially:
1. send pseudo-random code to modulator a and modulator b respectively by PN code generator a and PN code generator b, modulator a and modulator b modulate respectively pseudo-random code, and the damping capacity of attenuator a and attenuator b all is made as L
1
2. ground system utilizes detuner a and detuner b to measure the bit error rate of passage 1 and passage 2 respectively;
3. whether the bit error rate that 2. obtains of determining step is less than 10
-8, if less than 10
-8, then increase the damping capacity of attenuator a and attenuator b to set step-length, return the passage 1 that 2. step record respectively until detuner a and detuner b and passage 2 bit error rates greater than 10
-8And less than 10
-7If greater than 10
-8, then direct execution in step 4.;
4. the damping capacity of record attenuator a this moment and attenuator b is respectively L
RAnd L
L, when satellite when rail is crossed the top, the link margin of passage 1 is L
R-L
1, the link margin of passage 2 is L
L-L
1When satellite when rail is positioned at 5 ° of elevations angle of land station, the link margin of passage 1 is L
R-L
2, the link margin of passage 2 is L
L-L
2
The 4th step: the orientation angle that spaceborne double-circle polarization multiplexing number is passed antenna and terrestrial receiving antenna is drawn partially respectively, and draws in angle and to measure star ground when inclined to one side and unite polarize resolution and link margin, specifically comprises:
(1) orientation angle of spaceborne double-circle polarization multiplexing number biography antenna is drawn partially, measures star ground and unite polarization resolution and link margin, be specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, make its position angle and the angle of pitch depart from the state of aiming at that points to set step-length respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 3rd step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, the drift angle degree that draws that then spaceborne double-circle polarization multiplexing number is passed antenna increases setting value, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
1, and with its pointing accuracy as the spaceborne double-circle polarization multiplexing number biography antenna that satisfies star ground number biography link needs;
(2) orientation angle of terrestrial receiving antenna is drawn partially, measures star ground and unite polarization resolution and link margin, be specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller and get back to the state of aiming at that points to, the orientation angle of regulating terrestrial receiving antenna makes its position angle and the angle of pitch depart from the state of aiming at that points to set step-length respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 3rd step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, then the drift angle degree that draws with terrestrial receiving antenna increases setting value, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
2, and with its pointing accuracy as the terrestrial receiving antenna that satisfies star ground number biography link needs.
In described the 1st step, the damping capacity of calculating two attenuators is specially: the distance of establishing between satellite system and the ground system is D, and unit is km, the output power of modulator a and modulator b is P, unit is dBm, and satellite is in orbit the time, and entering the signal powers that number passes antennas is P
0, unit is dBm, and satellite orbital altitude is H, and unit is km;
Calculate the damping capacity L of two attenuators according to formula (1)
1, unit is dB;
L
1＝P-P
0+20lgH-20lgD （1）
Calculate the damping capacity L of two attenuators according to formula (2)
2, unit is dB;
Wherein, R is an earth radius, and unit is km.
In the described the 2nd two antennas are pointed to aligning mutually, specifically comprise:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is made as 0dB, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes passage 1 signal that aerial radiation goes out, and with the carrier power of frequency spectrograph a measurement passage 1;
2. regulate the position angle and the angle of pitch of terrestrial receiving antenna, it is maximum that the carrier power of the passage 1 that records until frequency spectrograph a reaches;
3. regulate the position angle and the angle of pitch that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, make the carrier power of the passage 1 that frequency spectrograph a records reach maximum;
4. write down spaceborne double-circle polarization multiplexing number and pass antenna and terrestrial receiving antenna orientation angle separately,, finish spaceborne double-circle polarization multiplexing number biography antenna and aim at the mutual sensing between the terrestrial receiving antenna as the benchmark of follow-up test.
Beneficial effect: the present invention can be to the multiplexing satellite-borne data transmission antenna of double-circle polarization star ground in orbit the time unite polarization resolution, link margin, pointing accuracy performances such as link influence carried out comprehensive ground validation, for foundation is provided in orbit, reduced risk in orbit.
Description of drawings
Fig. 1 is the schematic diagram of the test macro of ground validation method employing of the present invention.
Fig. 2 is the process flow diagram of ground validation method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
As shown in Figure 1, the invention provides the ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization, the test macro that this ground validation method adopts comprises satellite system and ground system;
In satellite system, modulator a and modulator b receive the two-way pseudo-random code that PN code generator a and PN code generator b send here respectively, and it is modulated, and form the two-way radiofrequency signal; The two-way radiofrequency signal is carried out power attenuation by attenuator a and attenuator b respectively, damping capacity is adjustable, the output signal of attenuator a and attenuator b inputs to spaceborne double-circle polarization multiplexing number biography antenna as passage 1 and passage 2 signals respectively, form the multiplexing radio frequency signal of double-circle polarization, and it is radiated to ground system.Wherein passage 1 is right-handed circular polarization, and passage 2 passes the orientation angle of antenna and can control by servo controller for left-hand circular polarization, spaceborne double-circle polarization multiplexing number.
In ground system, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes the multiplexing radio frequency signal of double-circle polarization that aerial radiation goes out, and the signal of two passages separated form independently passage 1 and passage 2 signals, deliver to low noise amplifier a and low noise amplifier b respectively.Terrestrial receiving antenna carries control system, can regulate the orientation angle of self.Low noise amplifier a and low noise amplifier b carry out delivering to low-converter a and low-converter b and carrying out down coversion respectively after low noise amplifies to passage 1 and passage 2 signals respectively.Passage 1 signal of finishing down coversion is divided into two-way by power splitter a, and one the road delivers to detuner a carries out demodulation, and another road is delivered to frequency spectrograph a and carried out spectrum measurement.Passage 2 signals of finishing down coversion are divided into two-way by power splitter b, and one the road delivers to detuner b carries out demodulation, and another road is delivered to frequency spectrograph b and carried out spectrum measurement.Detuner a and detuner b can carry out error rate measurement to the base band data that demodulation obtains.
Foundation is finished after the test macro shown in the accompanying drawing 1, and as shown in Figure 2, its ground validation method concrete steps are as follows:
The 1st step: determine that according to satellite system and the residing geographic position of ground system distance between the two is 3.5km.
The 2nd step: according to the distance between satellite system and the ground system and satellite in rail real work situation, calculate the damping capacity range of adjustment of attenuator a and attenuator b, if the output power of modulator a and modulator b is 0dBm, satellite is in orbit the time, the signal power that enters number biography antenna is 40dBm, and satellite orbital altitude is 505km; The damping capacity of attenuator a and attenuator b is made as 3dB, and then the star ground number of analog satellite when rail is crossed the top passes link circuit condition in test; The damping capacity of attenuator a and attenuator b is made as 16dB, and then the star ground number of analog satellite when rail is positioned at 5 ° of elevations angle of land station passes link circuit condition in test.
In this step, when satellite was crossed the top at rail, satellite system and ground system were apart from minimum; When satellite was positioned at 5 ° of elevations angle of land station at rail, satellite system and ground system were apart from maximum.
The 3rd step: spaceborne double-circle polarization multiplexing number passed to point to mutually between antenna and the terrestrial receiving antenna aim at, specifically comprise:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is made as 0dB, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes passage 1 signal that aerial radiation goes out, and with the carrier power of frequency spectrograph a measurement passage 1;
2. regulate the position angle and the angle of pitch of terrestrial receiving antenna, it is maximum that the carrier power of the passage 1 that records until frequency spectrograph a reaches;
3. regulate the position angle and the angle of pitch that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, make the carrier power of the passage 1 that frequency spectrograph a records reach maximum;
4. write down spaceborne double-circle polarization multiplexing number and pass antenna and terrestrial receiving antenna orientation angle separately,, finish spaceborne double-circle polarization multiplexing number biography antenna and aim at the mutual sensing between the terrestrial receiving antenna as the benchmark of follow-up test.
In this step, can adopt modulator b emission single-carrier signal, and the carrier power of the passage 2 that records by frequency spectrograph b reaches maximum, carry out the mutual sensing of two antennas and aim at.
The 4th step: carry out the ground validation simulation test, measure the star ground of passage 1 and passage 2 these two passages and unite the polarization resolution, specific as follows:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is set to 3dB, modulator b is in off-mode, the passage 1(right-handed circular polarization that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive) and passage 2(left-hand circular polarization) carrier power, be designated as A1 and A2 respectively;
2. by modulator b emission single-carrier signal, the damping capacity of attenuator b is set to 3dB, modulator a is in off-mode, the passage 1(right-handed circular polarization that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive) and passage 2(left-hand circular polarization) carrier power, be respectively B2 and B1;
3. it is A1-B2 that the polarization resolution is united on the star ground carrier power that 1. 2. obtains with step according to step, then passage 1(right-handed circular polarization), passage 2(left-hand circular polarization) to unite the resolution that polarizes be B1-A2 on star ground.
The 5th step: measure the link margin of two passages, specific as follows:
1. send pseudo-random code to modulator a and modulator b respectively by PN code generator a and PN code generator b, modulator a and modulator b modulate respectively pseudo-random code, and the damping capacity of attenuator a and attenuator b all is set to 3dB;
2. ground system utilizes detuner a and detuner b to measure passage 1(right-handed circular polarization respectively) and passage 2(left-hand circular polarization) the bit error rate;
3. whether the bit error rate that 2. obtains of determining step is less than 10
-8, if less than 10
-8, then be the damping capacity that step-length increases attenuator a and attenuator b, return the passage 1(right-handed circular polarization that 2. step records respectively until detuner a and detuner b with 1dB) and passage 2(left-hand circular polarization) bit error rate is greater than 10
-8And less than 10
-7If greater than 10
-8, then direct execution in step 4.;
4. the damping capacity of record attenuator a this moment and attenuator b is respectively L
RAnd L
L, when satellite when rail is crossed the top, passage 1(right-handed circular polarization) link margin be L
R-3dB, passage 2(left-hand circular polarization) link margin is L
L-3dB; When satellite when rail is positioned at 5 ° of elevations angle of land station, passage 1(right-handed circular polarization) link margin be L
R-16dB, passage 2(left-hand circular polarization) link margin is L
L-16dB.
The above-mentioned step 4 and the order of step 5 also can promptly be carried out earlier carrying out step 4 after the step 5 conversely.
The 6th step: the orientation angle that spaceborne double-circle polarization multiplexing number is passed antenna is drawn partially, and draws in angle and to measure star ground when inclined to one side and unite polarize resolution and link margin, is specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, making its position angle and the angle of pitch is that step-length departs from the state of aiming at that points to 0.1 ° respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 4th step and the 5th step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, the drift angle degree that draws that then spaceborne double-circle polarization multiplexing number is passed antenna increases by 0.1 °, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
1, and with its pointing accuracy as the spaceborne double-circle polarization multiplexing number biography antenna that satisfies star ground number biography link needs.
The 7th step: the orientation angle of terrestrial receiving antenna is drawn partially, and draw in angle and to measure star ground when inclined to one side and unite polarize resolution and link margin, be specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller and get back to the state of aiming at that points to, the orientation angle of regulating terrestrial receiving antenna, making its position angle and the angle of pitch be that step-length departs from the state that points to aligning with 0.01 ° respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 4th step and the 5th step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, then the drift angle degree that draws with terrestrial receiving antenna increases by 0.01 °, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
2, and with its pointing accuracy as the terrestrial receiving antenna that satisfies star ground number biography link needs.
The above-mentioned step 6 and the order of step 7 also can promptly be carried out earlier carrying out step 6 after the step 7 conversely.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the ground validation method of the multiplexing satellite-borne data transmission antenna performance of double-circle polarization is characterized in that, the test macro that this ground validation method adopts comprises satellite system and ground system; In satellite system, modulator a and modulator b receive the two-way pseudo-random code that PN code generator a and PN code generator b send here respectively, and it is modulated form the two-way radiofrequency signal, the two-way radiofrequency signal is carried out power attenuation by attenuator a and attenuator b respectively, both output signals input to spaceborne double-circle polarization multiplexing number biography antenna as passage 1 and passage 2 signals respectively, form the multiplexing radio frequency signal of double-circle polarization, and it is radiated to ground system; Wherein passage 1 is right-handed circular polarization, and passage 2 is left-hand circular polarization, and controls the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller;
In ground system, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes the multiplexing radio frequency signal of double-circle polarization that aerial radiation goes out, and the signal of two passages separated form independently passage 1 and passage 2 signals, delivering to low noise amplifier a and low noise amplifier b respectively carries out after low noise amplifies, deliver to low-converter a and low-converter b and carry out down coversion respectively, passage 1 signal of finishing down coversion is divided into two-way by power splitter a, one the road delivers to detuner a carries out demodulation, another road is delivered to frequency spectrograph a and is carried out spectrum measurement, passage 2 signals of finishing down coversion are divided into two-way by power splitter b, one the road delivers to detuner b carries out demodulation, and another road is delivered to frequency spectrograph b and carried out spectrum measurement;
Its ground validation method concrete steps are as follows:
The 1st step: in rail real work situation, calculate the damping capacity of attenuator a and attenuator b according to the distance between satellite system and the ground system and satellite; When satellite when rail is crossed the top, the damping capacity of two attenuators is made as L
1, when satellite was positioned at 5 ° of elevations angle of land station at rail, the damping capacity of two attenuators was made as L
2
The 2nd step: spaceborne double-circle polarization multiplexing number passed to point to mutually between antenna and the terrestrial receiving antenna aim at;
The 3rd step: carry out the ground validation simulation test, and the star ground of measuring passage 1 and passage 2 respectively unites polarize resolution and link margin, specifically comprise:
(1) the polarization resolution is united on the star ground of measuring passage 1 and passage 2, is specially:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is made as L
1, modulator b is in off-mode, and the passage 1 that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive and the carrier power of passage 2 are designated as A1 and A2 respectively;
2. by modulator b emission single-carrier signal, the damping capacity of attenuator b also is made as L
1, modulator a is in off-mode, and the passage 1 that ground system utilizes frequency spectrograph a and frequency spectrograph b to measure respectively to receive and the carrier power of passage 2 are respectively B2 and B1;
3. the carrier power that 1. 2. obtains with step according to step, then to unite the polarization resolution be A1-B2 on the star ground of passage 1, it is B1-A2 that the resolution that polarizes is united on the star ground of passage 2;
(2) link margin of two passages of measurement is specially:
1. send pseudo-random code to modulator a and modulator b respectively by PN code generator a and PN code generator b, modulator a and modulator b modulate respectively pseudo-random code, and the damping capacity of attenuator a and attenuator b all is made as L
1
2. ground system utilizes detuner a and detuner b to measure the bit error rate of passage 1 and passage 2 respectively;
3. whether the bit error rate that 2. obtains of determining step is less than 10
-8, if less than 10
-8, then increase the damping capacity of attenuator a and attenuator b to set step-length, return the passage 1 that 2. step record respectively until detuner a and detuner b and passage 2 bit error rates greater than 10
-8And less than 10
-7If greater than 10
-8, then direct execution in step 4.;
4. the damping capacity of record attenuator a this moment and attenuator b is respectively L
RAnd L
L, when satellite when rail is crossed the top, the link margin of passage 1 is L
R-L
1, the link margin of passage 2 is L
L-L
1When satellite when rail is positioned at 5 ° of elevations angle of land station, the link margin of passage 1 is L
R-L
2, the link margin of passage 2 is L
L-L
2
The 4th step: the orientation angle that spaceborne double-circle polarization multiplexing number is passed antenna and terrestrial receiving antenna is drawn partially respectively, and draws in angle and to measure star ground when inclined to one side and unite polarize resolution and link margin, specifically comprises:
(1) orientation angle of spaceborne double-circle polarization multiplexing number biography antenna is drawn partially, measures star ground and unite polarization resolution and link margin, be specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, make its position angle and the angle of pitch depart from the state of aiming at that points to set step-length respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 3rd step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, the drift angle degree that draws that then spaceborne double-circle polarization multiplexing number is passed antenna increases setting value, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
1, and with its pointing accuracy as the spaceborne double-circle polarization multiplexing number biography antenna that satisfies star ground number biography link needs;
(2) orientation angle of terrestrial receiving antenna is drawn partially, measures star ground and unite polarization resolution and link margin, be specially:
1. control the orientation angle that spaceborne double-circle polarization multiplexing number passes antenna by servo controller and get back to the state of aiming at that points to, the orientation angle of regulating terrestrial receiving antenna makes its position angle and the angle of pitch depart from the state of aiming at that points to set step-length respectively;
2. draw under the degree of drift angle at each, all measure star ground and unite polarization resolution and link margin by the method in the 3rd step;
3. whether the link margin that 2. obtains of determining step is less than 3dB, if less than 3dB, then execution in step 4.; If greater than 3dB, then the drift angle degree that draws with terrestrial receiving antenna increases setting value, returns step 2.;
4. stop angle is drawn partially, and the drift angle degree that draws at this moment is designated as θ
2, and with its pointing accuracy as the terrestrial receiving antenna that satisfies star ground number biography link needs.
2. the ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization as claimed in claim 1, it is characterized in that, in described the 1st step, the damping capacity of calculating two attenuators is specially: the distance of establishing between satellite system and the ground system is D, unit is km, and the output power of modulator a and modulator b is P, and unit is dBm, satellite is in orbit the time, and entering the signal powers that number passes antennas is P
0, unit is dBm, and satellite orbital altitude is H, and unit is km;
Calculate the damping capacity L of two attenuators according to formula (1)
1, unit is dB;
L
1＝P-P
0+20lgH-20lgD（1）
Calculate the damping capacity L of two attenuators according to formula (2)
2, unit is dB;
Wherein, R is an earth radius, and unit is km.
3. the ground validation method of the multiplexing satellite-borne data transmission antenna performance of a kind of double-circle polarization as claimed in claim 1 or 2 is characterized in that, in the 2nd step two antennas is pointed to aligning mutually, specifically comprises:
1. by modulator a emission single-carrier signal, the damping capacity of attenuator a is made as 0dB, terrestrial receiving antenna receives spaceborne double-circle polarization multiplexing number and passes passage 1 signal that aerial radiation goes out, and with the carrier power of frequency spectrograph a measurement passage 1;
2. regulate the position angle and the angle of pitch of terrestrial receiving antenna, it is maximum that the carrier power of the passage 1 that records until frequency spectrograph a reaches;
3. regulate the position angle and the angle of pitch that spaceborne double-circle polarization multiplexing number passes antenna by servo controller, make the carrier power of the passage 1 that frequency spectrograph a records reach maximum;
4. write down spaceborne double-circle polarization multiplexing number and pass antenna and terrestrial receiving antenna orientation angle separately,, finish spaceborne double-circle polarization multiplexing number biography antenna and aim at the mutual sensing between the terrestrial receiving antenna as the benchmark of follow-up test.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310070505.0A CN103217596B (en) | 2013-03-06 | 2013-03-06 | Ground verification method of performance of double-circle polarized multiplexed satellite-borne data transmission antenna |
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| CN111817773A (en) * | 2020-07-15 | 2020-10-23 | 中国科学院空天信息创新研究院 | Test system for cross polarization cancellation performance of dual circularly polarized satellite data receiving system |
| CN111835402A (en) * | 2020-06-05 | 2020-10-27 | 北京空间飞行器总体设计部 | Method and system for verifying performance of data transmission link |
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| CN108964741A (en) * | 2018-06-15 | 2018-12-07 | 上海卫星工程研究所 | A kind of spaceborne X frequency range high-speed digital transmission system |
| CN111835402A (en) * | 2020-06-05 | 2020-10-27 | 北京空间飞行器总体设计部 | Method and system for verifying performance of data transmission link |
| CN111817773A (en) * | 2020-07-15 | 2020-10-23 | 中国科学院空天信息创新研究院 | Test system for cross polarization cancellation performance of dual circularly polarized satellite data receiving system |
| CN111817773B (en) * | 2020-07-15 | 2021-12-31 | 中国科学院空天信息创新研究院 | Test system for cross polarization cancellation performance of dual circularly polarized satellite data receiving system |
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