阅读说明：本技术 导航卫星对高轨航天器服务能力提升方法 (Method for improving service capability of navigation satellite to high-orbit spacecraft ) 是由 王宇凯 任前义 董日昌 石碧舟 龚文斌 沈苑 林鑫超 于 2021-08-11 设计创作，主要内容包括：本发明提供了一种导航卫星对高轨航天器服务能力提升方法,包括：在不增加北斗导航卫星系统的实现复杂性,不增加额外单机或天线的基础上,对天线阵进行优化,增大波束范围和天线增益,同时提高功放输出功率,以进一步提高北斗导航卫星系统对36000km轨道高度处用户的服务能力。(The invention provides a method for improving the service capability of a navigation satellite on an overhead spacecraft, which comprises the following steps: on the basis of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna array is optimized, the wave beam range and the antenna gain are enlarged, and meanwhile, the power amplifier output power is improved, so that the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit is further improved.)

1. A method for improving the service capability of a navigation satellite on an overhead spacecraft is characterized by comprising the following steps:

on the basis of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna array is optimized, the wave beam range and the antenna gain are enlarged, and meanwhile, the power amplifier output power is improved, so that the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit is further improved.

2. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

and the antenna gain roll-off at the main lobe edge and the side lobe of the RNSS antenna of the Beidou navigation satellite system is reduced.

3. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

the consistency, the antenna gain and the power amplifier output power of each tangent plane of the RNSS antenna of the Beidou navigation satellite system are improved.

4. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

100% availability to users at 36000km track height is achieved.

5. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 2, further comprising:

by optimizing the antenna array of the RNSS antenna of the Beidou navigation satellite system, the power amplifier output power of the RNSS antenna of the Beidou navigation satellite system is improved, and the EIRP of the civil signal B1I at the +/-34.3-degree wave beam position is improved.

6. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 2, further comprising:

calculating the signal power at the aperture of the GEO user receiving antenna to obtain that the signal power at the aperture of the GEO user receiving antenna is not less than-180.85 dBW;

by comparing the signal power at the face of the receiving antenna of the GEO user with the threshold of the receiver system containing the antenna, the signal power at +/-34.3 degrees of the improved B1I signal is verified to meet the requirement of the receiver threshold of the GEO user, and 100% availability of the user at the height of the 36000km track is realized;

wherein the receiver system has an antenna threshold of-181 dBW.

7. The method for improving the service capability of a navigation satellite on an overhead spacecraft as claimed in claim 1, wherein the parameters of the improved B1I include:

satellite emission EIRP of an RNSS antenna of the Beidou navigation satellite system at a wave beam position of +/-34.3 degrees is 13.73-20.93 dBW;

the frequency of a Beidou navigation satellite transmitting signal is 1561 MHz;

the free space distance of the Beidou navigation satellite system is 69000 km;

the loss dB-193.08 of the free space of the Beidou navigation satellite system;

the polarization, the pointing loss and the like of the Beidou navigation satellite system are integrated to be-1.5 dB;

the level of the user receiving antenna aperture of the Beidou navigation satellite system is-180.85-173.65 dBW.

8. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

serving the earth's surface and an airspace range below 3000km using a first mode comprising: conventional high power amplifiers incorporate array antenna saddle shaping.

9. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

serving a spatial domain at 36000km orbital altitude from the earth's surface using a second mode comprising: an ultra-high power amplifier is adopted, and the output power of the ultra-high power amplifier is greater than that of a conventional high power amplifier;

the beam range of the antenna array is enlarged, the consistency of the tangent plane is optimized, and the gain of the beam edge is improved;

by adopting the ultra-high power amplifier, the beam range of the antenna array is enlarged, the tangent plane consistency is optimized, and the beam edge gain is improved, so that the performance of the beam within the range of +/-34.3 degrees is improved.

10. The method for improving the service capability of the navigation satellite on the high orbit spacecraft as claimed in claim 1, further comprising:

the antenna array layout mode is optimized by the combination of 12 spiral unit antennas;

the proper amplitude and phase weighting is carried out on each unit antenna,

optimizing a caliber distribution function according to requirements, and carrying out beam forming, wherein the beam forming comprises the following steps:

whereinIs the directional pattern of the array antenna,in order to be the directional pattern of the unit antenna,in order to be the array factor,off-axis and azimuth;

lifting the RNSS antenna array +/-34.3-degree wave beams through the steps;

meanwhile, the existing navigation transmitting system is upgraded, and a GaN solid-state power amplifier with output power of 300W or more is adopted, so that the service performance of the main lobe edge and the side lobe of the downlink wave beam of the navigation satellite is improved, and the service capability of the high-orbit spacecraft is improved.

Technical Field

The invention relates to the technical field of navigation satellites, in particular to a method for improving the service capability of a navigation satellite on an high-orbit spacecraft.

Background

Satellite navigation systems provide accurate and continuous three-dimensional position, velocity and time information to users with corresponding receiving devices worldwide through satellites, and have become an infrastructure strategic and strategic facility, which is closely related to the development of national security and socioeconomic development. Currently, a satellite navigation system is in the process of development and evolution, and the development of the system and the prosperity of enhancing the system will significantly change the development prospect of satellite navigation. Satellite navigation systems have become national important infrastructures, and play more and more important roles in ensuring national security, promoting economic development, improving the quality of life of people and the like. The united states GPS system, russian GLONASS system, european Galileo system and chinese beidou system are the four major satellite navigation systems in the world, and the japanese quasi-zenith satellite navigation system (QZSS) and indian regional satellite navigation system (IRNSS) are also actively under construction.

Generally speaking, the service airspace of a satellite navigation system is the area below the surface of the earth and a certain altitude (for example, 3000km), and the area is within the main lobe pointing range of a satellite transmitting antenna, the received satellite signal strength can be guaranteed, and the probability of seeing more than 4 satellites at the same time is close to 100%. However, as the ability of human exploration space increases and the range of motion expands, more and more satellites and aircrafts are used in high orbit (above 3000km on the earth surface). The medium and high orbit spacecrafts such as space detection, ground remote sensing, broadcast communication and the like, and various satellite constellation networking collaboration, formation flying and the like all need more continuous, more accurate and more real-time orbit determination and PVT measurement services. In order to meet the navigation and positioning requirements of medium and high orbit and deep space user spacecrafts, the medium and high orbit spacecraft can carry a navigation receiver to capture the edge of a main lobe and a side lobe radiation signal of a navigation satellite system antenna to realize the functions of positioning, timing, auxiliary orbit determination and the like, as shown in fig. 1. However, the service capability of the existing Beidou navigation satellite to the high-orbit user with the track height of 36000km is insufficient, and further improvement is needed.

Disclosure of Invention

The invention aims to provide a method for improving the service capability of a navigation satellite on an high orbit spacecraft, and aims to solve the problem that the service capability of the existing Beidou navigation satellite on a high orbit user with the orbit height of 36000km is insufficient, and the service capability needs to be further improved.

In order to solve the technical problem, the invention provides a method for improving the service capability of a navigation satellite on an overhead spacecraft, which comprises the following steps:

on the basis of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna array is optimized, the wave beam range and the antenna gain are enlarged, and meanwhile, the power amplifier output power is improved, so that the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit is further improved.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

and the antenna gain roll-off at the main lobe edge and the side lobe of the RNSS antenna of the Beidou navigation satellite system is reduced.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

the consistency, the antenna gain and the power amplifier output power of each tangent plane of the RNSS antenna of the Beidou navigation satellite system are improved.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized:

under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas,

100% availability to users at 36000km track height is achieved.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

by optimizing the antenna array of the RNSS antenna of the Beidou navigation satellite system, the power amplifier output power of the RNSS antenna of the Beidou navigation satellite system is improved, and the EIRP of the civil signal B1I at the +/-34.3-degree wave beam position is improved.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

calculating the signal power at the aperture of the GEO user receiving antenna to obtain that the signal power at the aperture of the GEO user receiving antenna is not less than-180.85 dBW;

by comparing the signal power at the face of the receiving antenna of the GEO user with the threshold of the receiver system containing the antenna, the signal power at +/-34.3 degrees of the improved B1I signal is verified to meet the requirement of the receiver threshold of the GEO user, and 100% availability of the user at the height of the 36000km track is realized;

wherein the receiver system has an antenna threshold of-181 dBW.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the parameters of the improved B1I include:

satellite emission EIRP of an RNSS antenna of the Beidou navigation satellite system at a wave beam position of +/-34.3 degrees is 13.73-20.93 dBW;

the frequency of a Beidou navigation satellite transmitting signal is 1561 MHz;

the free space distance of the Beidou navigation satellite system is 69000 km;

the loss dB-193.08 of the free space of the Beidou navigation satellite system;

the polarization, the pointing loss and the like of the Beidou navigation satellite system are integrated to be-1.5 dB;

the level of the user receiving antenna aperture of the Beidou navigation satellite system is-180.85-173.65 dBW.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

serving the earth's surface and an airspace range below 3000km using a first mode comprising: conventional high power amplifiers incorporate array antenna saddle shaping.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

serving a spatial domain at 36000km orbital altitude from the earth's surface using a second mode comprising: an ultra-high power amplifier is adopted, and the output power of the ultra-high power amplifier is greater than that of a conventional high power amplifier;

the beam range of the antenna array is enlarged, the consistency of the tangent plane is optimized, and the gain of the beam edge is improved;

by adopting the ultra-high power amplifier, the beam range of the antenna array is enlarged, the tangent plane consistency is optimized, and the beam edge gain is improved, so that the performance of the beam within the range of +/-34.3 degrees is improved.

Optionally, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes:

the antenna array layout mode is optimized by the combination of 12 spiral unit antennas;

the proper amplitude and phase weighting is carried out on each unit antenna,

optimizing a caliber distribution function according to requirements, and carrying out beam forming, wherein the beam forming comprises the following steps:

whereinIs the directional pattern of the array antenna,in order to be the directional pattern of the unit antenna,in order to be the array factor,off-axis and azimuth;

lifting the RNSS antenna array +/-34.3-degree wave beams through the steps;

meanwhile, the existing navigation transmitting system is upgraded, and a GaN solid-state power amplifier with output power of 300W or more is adopted, so that the service performance of the main lobe edge and the side lobe of the downlink wave beam of the navigation satellite is improved, and the service capability of the high-orbit spacecraft is improved.

The inventor of the invention finds that, at present, the general performance of the GEO user satellite-borne receiver system is as follows:

antenna size: 140 x 452.5 mm;

antenna gain: not less than 7dB (± 30 ° beam width);

receiver sensitivity (no antenna): 174 dBW.

The satellite-borne receiver system is configured at a GEO user side, and 100% quadruple coverage in a 36000km height area can be realized when the beam angle of a downlink antenna of 24 Beidou MEO satellites is +/-34.3 degrees, the average PDOP is about 83.96, and the positioning accuracy can reach ten meters to hundred meters.

However, when the current RNSS antenna of the beidou navigation satellite system is designed, in order to ensure that the received signal powers reaching all places on the earth surface are basically the same, the RNSS antenna adopts an array antenna to perform beam forming, so that the off-axis angle is 0-13.2 degrees (the earth edge blocking angle EOE), the range is in a saddle shape, the 13.2-degree external gain is gradually attenuated, and the antenna performance of the main lobe edge and the side lobe is not ensured, so that the main lobe edge and the side lobe beam gain roll-off is large, and the difference between each tangent plane is large, as shown in fig. 2.

The signal power at the aperture of the GEO user receiving antenna is calculated according to the EIRP of the beidou navigation satellite civil signal B1I at the beam of ± 34.3 ° as shown in table 1.

TABLE 1

Parameter(s)	Unit of	Current B1I
			Satellite transmission EIRP (+ -34.3 degree)	dBW	-13.27～13.93
Frequency of satellite transmission signal	MHz	1561
			Distance in free space	km	69000
Loss of free space	dB	-193.08
			Combinations of polarisation and directional losses	dB	-1.5
Level of user receiving antenna	dBW	-207.85～-180.65

It can be seen that the signal power at ± 34.3 ° of the beidou B1I beam is difficult to completely meet the requirement of the GEO user receiver threshold (the threshold of the receiver system containing the antenna is-181 dBW), and 100% quadruple coverage cannot be realized. Therefore, the service capability of the Beidou navigation satellite to the high-orbit user with the track height of 36000km is insufficient, and further improvement is needed.

In the method for improving the service capability of the navigation satellite on the high-orbit spacecraft, the antenna array is optimized, the beam range and the antenna gain are enlarged, and the power amplifier output power is improved on the basis of not increasing the implementation complexity of a Beidou navigation satellite system and not increasing additional single machines or antennas, so that the service capability of the Beidou navigation satellite system on users at the height of 36000km orbit is further improved, the problems that the service capability of the current navigation satellite on the high-orbit spacecraft at the height of 36000km orbit is poor and the 100% availability is difficult to realize are solved, the navigation satellite service is further expanded to the depth of space, the RNSS antenna array of the navigation satellite system is optimized without increasing the implementation complexity of the satellite system, the beam range and the antenna gain are enlarged, and the power amplifier output power is improved at the same time, so that the receiver threshold requirement of the users at the height of 36000km orbit is met, 100% availability is achieved.

Drawings

FIG. 1 is a schematic diagram of a conventional GEO satellite receiving a main lobe edge and a side lobe radiation signal of a navigation satellite;

FIG. 2 is a schematic diagram of the big main lobe edge and side lobe beam gain roll-off caused by the existing current Beidou B1I antenna direction;

fig. 3 is a schematic directional diagram of a B1I antenna improved by a method for improving the service capability of a navigation satellite for an overhead spacecraft in an embodiment of the present invention;

fig. 4 is a schematic diagram of a general scheme of a method for improving the service capability of a navigation satellite on an altitude spacecraft in an embodiment of the invention;

fig. 5 is a schematic diagram of an optimized antenna array layout of a method for improving the service capability of a navigation satellite for an overhead spacecraft in an embodiment of the present invention;

fig. 6 is a schematic diagram of an overall optimization architecture of a method for improving the service capability of a navigation satellite for an overhead spacecraft in an embodiment of the present invention.

Detailed Description

The invention is further elucidated with reference to the drawings in conjunction with the detailed description.

It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.

In the present invention, "disposed on …", "disposed over …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless otherwise specified. Further, "disposed on or above …" merely indicates the relative positional relationship between two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.

In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.

In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.

It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario. Furthermore, features from different embodiments of the invention may be combined with each other, unless otherwise indicated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.

It is also noted herein that, within the scope of the present invention, the terms "same", "equal", and the like do not mean that the two values are absolutely equal, but allow some reasonable error, that is, the terms also encompass "substantially the same", "substantially equal". By analogy, in the present invention, the terms "perpendicular", "parallel" and the like in the directions of the tables also cover the meanings of "substantially perpendicular", "substantially parallel".

The numbering of the steps of the methods of the present invention does not limit the order of execution of the steps of the methods. Unless specifically stated, the method steps may be performed in a different order.

The method for improving the service capability of the navigation satellite for the high orbit spacecraft, which is provided by the invention, is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The invention aims to provide a method for improving the service capability of a navigation satellite on an high orbit spacecraft, and aims to solve the problem that the service capability of the existing Beidou navigation satellite on a high orbit user with the orbit height of 36000km is insufficient, and the service capability needs to be further improved.

In order to achieve the purpose, the invention provides a method for improving the service capability of a navigation satellite on an overhead spacecraft, which comprises the following steps: on the basis of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna array is optimized, the wave beam range and the antenna gain are enlarged, and meanwhile, the power amplifier output power is improved, so that the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit is further improved.

Aiming at the current situations that the gain of an antenna outside a +/-13.2-degree wave beam of an RNSS antenna of the Beidou navigation satellite system is gradually attenuated, the roll-off of the gain of the antenna at the edge of a main lobe and the position of a side lobe is large, the consistency among all tangent planes is poor, the gain is low and the like, in order to realize 100% availability of users at the height of a 36000km orbit, and consider not to increase the complexity of the realization of the satellite system and not to increase additional single machines or antennas, the invention provides a scheme for optimizing an antenna array, enlarging the wave beam range and the antenna gain and simultaneously improving the output power of a power amplifier. The RNSS antenna ± 34.3 ° beam is elevated as shown in fig. 3.

The embodiment of the invention provides a method for improving the service capability of a navigation satellite on an overhead spacecraft, which comprises the following steps: on the basis of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna array is optimized, the wave beam range and the antenna gain are enlarged, and meanwhile, the power amplifier output power is improved, so that the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit is further improved.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized: under the conditions of not increasing the realization complexity of the Beidou navigation satellite system and not increasing additional single machines or antennas, the antenna gain roll-off at the main lobe edge and the side lobe of the RNSS antenna of the Beidou navigation satellite system is reduced.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized: the consistency, the antenna gain and the power amplifier output power of each tangent plane of the RNSS antenna of the Beidou navigation satellite system are improved under the conditions that the realization complexity of the Beidou navigation satellite system is not increased and an additional single machine or antenna is not added.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: under the condition that the gain of the antenna outside the RNSS antenna +/-13.2-degree wave beam of the Beidou navigation satellite system is gradually attenuated, the gain of the antenna of the RNSS antenna of the Beidou navigation satellite system at the wave beam +/-34.3 degrees is increased, so that the following effects are realized: the method realizes 100% availability to users at the height of 36000km orbit without increasing the realization complexity of a Beidou navigation satellite system and adding additional single machines or antennas.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: by optimizing the antenna array of the RNSS antenna of the Beidou navigation satellite system, the power amplifier output power of the RNSS antenna of the Beidou navigation satellite system is improved, and the EIRP of the civil signal B1I at the +/-34.3-degree wave beam position is improved.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: calculating the signal power at the aperture of the GEO user receiving antenna to obtain that the signal power at the aperture of the GEO user receiving antenna is not less than-180.85 dBW; by comparing the signal power at the face of the receiving antenna of the GEO user with the threshold of the receiver system containing the antenna, the signal power at +/-34.3 degrees of the improved B1I signal is verified to meet the requirement of the receiver threshold of the GEO user, and 100% availability of the user at the height of the 36000km track is realized; wherein the receiver system has an antenna threshold of-181 dBW.

In an embodiment of the present invention, the antenna array layout (composed of 12 spiral element antennas) is optimized, the array layout mode is optimized, as shown in fig. 5, and appropriate amplitude and phase weighting is performed on each element antenna, that is, the aperture distribution function is optimized according to the requirement, and beam forming is performedWhereinIs the directional pattern of the array antenna,in order to be the directional pattern of the unit antenna,in order to be the array factor,off-axis angle and azimuth angle), as shown in fig. 3, the beam position of plus or minus 34.3 degrees of the RNSS antenna array is lifted, meanwhile, the existing navigation transmitting system is upgraded, a GaN solid-state power amplifier with output power of 300W or more is adopted, and the whole structure is as shown in fig. 6, so that the service performance of the main lobe edge and the side lobe of the downlink beam of the navigation satellite is improved, and the service capability of the high-orbit spacecraft is improved.

By optimizing the antenna array and improving the output power of the power amplifier, the EIRP of the civil signal B1I at the position of +/-34.3-degree wave beams can be improved, and the signal power at the aperture of the receiving antenna of the GEO user is calculated as shown in Table 2. It can be seen that the signal power at the aperture of the GEO user receiving antenna is not less than-180.85 dBW, the signal power at ± 34.3 ° of the improved B1I signal can basically meet the GEO user receiver threshold requirement (the threshold of the receiver system containing the antenna is-181 dBW), and 100% availability is realized.

TABLE 2

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the parameters of the improved B1I include: satellite emission EIRP of an RNSS antenna of the Beidou navigation satellite system at a wave beam position of +/-34.3 degrees is 13.73-20.93 dBW; the frequency of a Beidou navigation satellite transmitting signal is 1561 MHz; the free space distance of the Beidou navigation satellite system is 69000 km; the loss dB-193.08 of the free space of the Beidou navigation satellite system; the polarization, the pointing loss and the like of the Beidou navigation satellite system are integrated to be-1.5 dB; the level of the user receiving antenna aperture of the Beidou navigation satellite system is-180.85-173.65 dBW.

On the basis of not increasing the complexity of the satellite system and not increasing additional single machines or antennas, the invention provides a scheme for optimizing the antenna array, enlarging the beam range and the antenna gain and simultaneously improving the output power of the power amplifier, thereby further improving the service capability of the Beidou navigation satellite system for users at the height of the 36000km orbit, as shown in figure 4.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: serving the earth's surface and an airspace range below 3000km using a first mode comprising: conventional high power amplifiers incorporate array antenna saddle shaping.

In an embodiment of the present invention, in the method for improving the service capability of the navigation satellite to the high orbit spacecraft, the method further includes: serving a spatial domain at 36000km orbital altitude from the earth's surface using a second mode comprising: an ultra-high power amplifier is adopted, and the output power of the ultra-high power amplifier is greater than that of a conventional high power amplifier; the beam range of the antenna array is enlarged, the consistency of the tangent plane is optimized, and the gain of the beam edge is improved; by adopting the ultra-high power amplifier, the beam range of the antenna array is enlarged, the tangent plane consistency is optimized, and the beam edge gain is improved, so that the performance of the beam within the range of +/-34.3 degrees is improved.

In summary, the above embodiments have described in detail different configurations of the method for improving the service capability of the navigation satellite for the high orbit spacecraft, and it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any content that is transformed based on the configurations provided by the above embodiments is within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.