Satellite signal simulation system

Abstract

The present invention provides a satellite signal simulation system, which includes: a signal simulation generator, the signal simulation generator being configured to simulate satellite signals; a power distributor, the signal input end of the power distributor being electrically connected to the signal output end of the signal simulation generator, the power distributor having multiple signal output ends; and multiple signal transmitters, the signal input end of each signal transmitter being electrically connected to any signal output end of the power distributor, the multiple signal transmitters being spaced apart and distributed in a target area. The satellite signal simulation system provided by the present invention, by providing a signal simulation generator, a power distributor, and multiple signal transmitters, can achieve controllable satellite signal strength, stably output satellite signals, and accurately and stably meet positioning test standards.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning systems, and in particular to a satellite signal simulation system. Background Art

[0002] With the development of science and technology, global positioning systems have been increasingly used in people's work and life. Global positioning systems such as GPS and Beidou use satellite technology to achieve full coverage of the earth's positioning signals. However, in indoor areas or other areas with weak satellite signals, global positioning systems cannot be used for positioning. How to achieve accurate indoor positioning testing has become a key technical issue.

[0003] Currently, indoor positioning signal testing involves installing a satellite signal receiving antenna outdoors and then transmitting the signal through an indoor antenna to cover the indoor test area. This testing method is easily affected by the external weather environment, and the strength of the received signal is uncontrollable. The output satellite signal is unstable and cannot accurately and stably meet the positioning test standards. Summary of the Invention

[0004] The present invention provides a satellite signal simulation system to solve the defects in the existing technology that the testing method is easily affected by the external weather environment, the strength of the received signal is uncontrollable, the output satellite signal is unstable, and it cannot accurately and stably meet the positioning test standards. The system can control the strength of the satellite signal and stably output the satellite signal, which can accurately and stably meet the positioning test standards.

[0005] The present invention provides a satellite signal simulation system, which includes: a signal simulation generator, which is configured to simulate satellite signals; a power distributor, whose signal input end is electrically connected to the signal output end of the signal simulation generator, and the power distributor has multiple signal output ends; and multiple signal transmitters, whose signal input end is electrically connected to any signal output end of the power distributor, and the multiple signal transmitters are spaced apart and distributed in a target area.

[0006] According to a satellite signal simulation system provided by the present invention, the satellite signal simulation system also includes: a signal amplifier, the signal input end of the signal amplifier is electrically connected to the signal output end of the signal simulation generator, and the signal output end of the signal amplifier is electrically connected to the signal input end of the power divider.

[0007] According to a satellite signal simulation system provided by the present invention, the satellite signal simulation system also includes: an attenuator, the signal input end of the attenuator is electrically connected to the signal output end of the signal amplifier, and the signal output end of the attenuator is electrically connected to the signal input end of the power divider.

[0008] According to a satellite signal simulation system provided by the present invention, the satellite signal simulation system also includes: multiple adjustable attenuators, the signal input end of each adjustable attenuator is electrically connected to the signal output end of the power distributor, and the signal output end of each adjustable attenuator is electrically connected to the signal input end of any one of the signal transmitters.

[0009] According to a satellite signal simulation system provided by the present invention, the signal strengths of the adjusted satellite signals outputted from the signal output ends of the plurality of adjustable attenuators are the same.

[0010] According to a satellite signal simulation system provided by the present invention, the power distributor includes: a first sub-distributor, the signal input end of the first sub-distributor is electrically connected to the signal output end of the signal simulation generator, and the first sub-distributor has multiple signal output ends; a second sub-distributor, the signal input end of the second sub-distributor is electrically connected to any signal output end of the first sub-distributor, the second sub-distributor has multiple signal output ends, and the signal input end of each signal transmitter is electrically connected to any signal output end of the second sub-distributor.

[0011] According to a satellite signal simulation system provided by the present invention, the first sub-distributor and / or the second sub-distributor is a 1-to-4 power distributor or a 1-to-8 power distributor.

[0012] According to a satellite signal simulation system provided by the present invention, the distance between adjacent signal transmitters is 3 meters to 20 meters.

[0013] According to a satellite signal simulation system provided by the present invention, the signal simulation generator of the satellite signal simulation system is further configured to simulate GPS satellite signals and / or Beidou satellite signals.

[0014] According to a satellite signal simulation system provided by the present invention, the signal input end of the signal transmitter is electrically connected to any signal output end of the power distributor via a radio frequency cable.

[0015] The satellite signal simulation system provided by the present invention can achieve controllable satellite signal strength and stable satellite signal output by setting a signal simulation generator, a power distributor and multiple signal transmitters, and can accurately and stably meet positioning test standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural diagram of the satellite signal simulation system provided by the present invention;

[0018] Reference numerals:

[0019] Signal simulation generator 10; Power distributor 20; Signal transmitter 30;

[0020] Signal amplifier 40; Attenuator 50; Adjustable attenuator 60. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0023] The following combination Figure 1 The satellite signal simulation system of the present invention is described.

[0024] like Figure 1 As shown, the present invention provides a satellite signal simulation system, which includes: a signal simulation generator 10, a power distributor 20 and a plurality of signal transmitters 30.

[0025] The satellite signal simulation system can be set up indoors. Since indoors is often blocked by buildings, the real satellite signal strength is weak and difficult to play a role. Therefore, the satellite signal simulation system can be used to simulate satellite signals in real scenes.

[0026] The signal simulation generator 10 is configured to simulate satellite signals.

[0027] It can be understood that the signal simulation generator 10 can simulate the functions of a real satellite, such as simulating the satellite's flight attitude, orbital dynamics and the change process of the satellite's full-frame telemetry information flow in each measurement and control arc segment. The signal simulation generator 10 can generate high-dynamic navigation signals to detect the capture and tracking performance of the receiving equipment. It can also generate specific navigation signals to verify the feasibility of the test plan. It can also be used as a comparison standard to detect the dynamic measurement accuracy of the navigation receiver.

[0028] Here, the signal simulation generator 10 can simulate satellite signals in real scenarios for users.

[0029] The signal input end of the power divider 20 is electrically connected to the signal output end of the signal simulation generator 10 , and the power divider 20 has a plurality of signal output ends.

[0030] It can be understood that the power divider 20 can also be called a multi-way power divider. The power divider 20 is used to split the satellite signal generated by the signal simulation generator 10, that is, to split one part into multiple parts. Correspondingly, the power divider 20 can have a signal input end and multiple signal output ends, and can split an input signal into multiple output signals. Here, the power divider 20 divides one satellite signal into multiple satellite signals.

[0031] The function of a power splitter is to divide the incoming satellite signal into several equally divided output channels, usually with two-way, four-way, and six-way splits. The operating frequency of the power splitter is 950MHz-2150MHz.

[0032] The technical specifications of a power divider include frequency range, power handling, main-to-branch distribution loss, insertion loss between input and output, isolation between branch ports, and voltage standing wave ratio (VSWR) at each port. Frequency range is a prerequisite for the operation of various RF / microwave circuits, and the design structure of a power divider is closely related to the operating frequency. The operating frequency of the divider must be clearly defined before proceeding with the design. Power handling refers to the maximum power a power divider can withstand. In high-power dividers / combiners, the maximum power that circuit components can withstand is a core specification, determining the type of transmission line used to achieve the design. Generally, the order of power handling for transmission lines, from low to high, is microstrip, stripline, coaxial, air stripline, and air coaxial. The choice of line type should be based on the design task. The main-to-branch distribution loss is essentially related to the power distribution ratio of the power divider. For example, the distribution loss of a two-way power divider is 3dB, and the distribution loss of a four-way power divider is 6dB. The insertion loss between input and output is due to factors such as the imperfect dielectric or conductor of the transmission line (such as a microstrip line), and the loss caused by the standing wave ratio at the input end should be considered. The isolation between branch ports is another important indicator of the power divider. If the power input from each branch port can only be output from the main port and should not be output from other branches, this requires sufficient isolation between the branches. The smaller the voltage standing wave ratio of each port, the better.

[0033] The signal input end of each signal transmitter 30 is electrically connected to any signal output end of the power distributor 20 , and the plurality of signal transmitters 30 are spaced apart and distributed in the target area.

[0034] It is understandable that the number of signal transmitters 30 may correspond to the number of signal output terminals of the power distributor 20 , that is, the power distributor 20 may distribute multiple satellite signals to multiple signal transmitters 30 via multiple signal output terminals.

[0035] Multiple signal transmitters 30 are spaced apart and distributed in the target area, and the target area can be the ceiling of the room. That is, multiple signal transmitters 30 can be spaced apart and distributed on the ceiling of the room, and the distances between adjacent signal transmitters 30 can be equal, that is, they are arranged at equal intervals. Of course, the distances between adjacent signal transmitters 30 may not be completely equal, that is, they can be arranged in a staggered manner, which is not specifically limited here.

[0036] Currently, indoor GPS / Beidou signal testing requires installing a GPS / Beidou satellite signal receiving antenna outdoors and connecting it to a GPS / Beidou signal amplification device indoors. The signal is amplified and then transmitted through the indoor GPS / Beidou antenna to cover the indoor test area. This testing method is easily affected by the external weather environment and the strength of the received signal is uncontrollable. The satellite signal output after signal amplification is unstable and cannot accurately and stably meet the test standards.

[0037] In this embodiment, multiple signal transmitters 30 are spaced apart and distributed in the target area, so that the satellite signal strength distribution can be uniform and controllable within the same product test area.

[0038] At the same time, the use of the signal simulation generator 10 to simulate the satellite signal in this embodiment and the use of multiple signal transmitters 30 to disperse the satellite signal can enable the satellite signal to stably cover the indoor test area without being disturbed by the weather environment, and can adjust the strength of the satellite signal according to the product testing standard to achieve controllable strength of the satellite signal.

[0039] The satellite signal simulation system provided by the present invention can achieve controllable satellite signal strength and stably output satellite signals by setting a signal simulation generator 10, a power distributor 20 and multiple signal transmitters 30, and can accurately and stably meet positioning test standards.

[0040] like Figure 1 As shown, in some embodiments, the satellite signal simulation system further includes: a signal amplifier 40 .

[0041] The signal input terminal of the signal amplifier 40 is electrically connected to the signal output terminal of the signal simulation generator 10 , and the signal output terminal of the signal amplifier 40 is electrically connected to the signal input terminal of the power divider 20 .

[0042] It can be understood that the signal amplifier 40 can be located between the signal simulation generator 10 and the power distributor 20 in the circuit connection of the satellite signal simulation system. The signal input end of the power distributor 20 is electrically connected to the signal output end of the signal simulation generator 10 through the signal amplifier 40. The signal amplifier 40 can be used to amplify the satellite signal, which can enhance the power of the satellite signal so that the satellite signal after splitting can maintain a certain strength.

[0043] like Figure 1 As shown, in some embodiments, the satellite signal simulation system further includes: an attenuator 50 .

[0044] The signal input end of the attenuator 50 is electrically connected to the signal output end of the signal amplifier 40 , and the signal output end of the attenuator 50 is electrically connected to the signal input end of the power divider 20 .

[0045] It can be understood that the attenuator 50 is an electronic component that provides attenuation and is widely used in electronic equipment. Its main uses are: adjusting the size of the signal in the circuit; in the comparison method measurement circuit, it can be used to directly read the attenuation value of the measured network; improving impedance matching. If some circuits require a relatively stable load impedance, an attenuator 50 can be inserted between this circuit and the actual load impedance to buffer the impedance changes.

[0046] An attenuator is a circuit used to introduce a predetermined attenuation within a specified frequency range. It is generally specified in decibels of attenuation and its characteristic impedance in ohms. Attenuators are widely used in cable television systems to meet multi-port level requirements, such as controlling amplifier input and output levels and controlling branch attenuation. Attenuators come in two types: passive and active. Active attenuators, when combined with other thermal sensors, form variable attenuators, which are installed in amplifiers for automatic gain or slope control circuits. Passive attenuators include fixed and adjustable attenuators.

[0047] The attenuator 50 herein can be an adjustable attenuator or a fixed attenuator. In the circuit connection of the satellite signal simulation system, it can be located between the signal amplifier 40 and the power distributor 20. The signal input end of the power distributor 20 is electrically connected to the signal output end of the signal amplifier 40 through the attenuator 50. The attenuator 50 can provide attenuation to the amplified satellite signal and can adjust the size of the satellite signal.

[0048] like Figure 1 As shown, in some embodiments, the satellite signal simulation system further includes: a plurality of adjustable attenuators 60 .

[0049] The signal input end of each adjustable attenuator 60 is electrically connected to the signal output end of the power divider 20 , and the signal output end of each adjustable attenuator 60 is electrically connected to any signal transmitter 30 .

[0050] It can be understood that in the circuit connection of the satellite signal simulation system, the adjustable attenuator 60 can be located between the power distributor 20 and the signal transmitter 30, and the signal input end of the signal transmitter 30 can be electrically connected to the signal output end of the power distributor 20 through the adjustable attenuator 60. Since different signal transmitters 30 are installed in different positions and the distances between them and the power distributor 20 are also different, the lengths of the RF cables connected to the power distributor 20 are also different. The adjustable attenuator 60 can adjust the differences caused by the signal attenuation of RF cables of different lengths, so that the signal strengths of the satellite signals emitted by different signal transmitters 30 remain consistent.

[0051] In some embodiments, the signal strengths of the adjusted satellite signals outputted from the signal output ends of the plurality of adjustable attenuators 60 are the same.

[0052] It is understandable that different attenuation values ​​of the adjustable attenuators 60 can be set so that the signal strength of the adjusted satellite signals output by the signal output ends of different adjustable attenuators 60 is the same. Then, the signal strength of the satellite signals emitted by all signal transmitters 30 are equal, so that the signal strength in different areas of the room can be equal, which can further improve the accuracy of the test.

[0053] In some embodiments, the power splitter 20 includes a first sub-splitter and a second sub-splitter.

[0054] The signal input end of the first sub-distributor is electrically connected to the signal output end of the signal simulation generator 10 , and the first sub-distributor has a plurality of signal output ends.

[0055] The signal input terminal of the second sub-distributor is electrically connected to any signal output terminal of the first sub-distributor. The second sub-distributor has multiple signal output terminals, and each signal transmitter 30 is electrically connected to any signal output terminal of the second sub-distributor.

[0056] It can be understood that the first sub-distributor can preliminarily split the satellite signal to obtain a coarse satellite signal, and the second sub-distributor can further split the coarse satellite signal to obtain a fine satellite signal. In this way, the existing power distributor 20 can be used to flexibly meet the number of distribution branches of the satellite signal according to the user.

[0057] In some embodiments, the first sub-divider and / or the second sub-divider is a 1-to-4 power divider 20 or a 1-to-8 power divider 20 .

[0058] For example, when the first sub-distributor is a 1-to-4 power distributor 20, the corresponding number of second sub-distributors can be 4, and the signal input end of each second sub-distributor is electrically connected to a signal output end of the first sub-distributor. If the second sub-distributor is a 1-to-4 power distributor 20, the satellite signal can be split into 16 paths. If the second sub-distributor is a 1-to-8 power distributor 20, the satellite signal can be split into 32 paths.

[0059] In some embodiments, the distance between adjacent signal transmitters 30 is 3 meters to 20 meters, for example, 10 meters. Such a distance setting can ensure uniform distribution of indoor satellite signals as much as possible while saving costs.

[0060] In some embodiments, the signal simulation generator 10 is further configured to simulate GPS satellite signals and / or BeiDou satellite signals.

[0061] The Global Positioning System (GPS) is a medium-range circular-orbit satellite navigation system. It provides accurate positioning, velocity measurement, and a high-precision time standard for the vast majority (98%) of the Earth's surface. The basic principle of GPS positioning is to use the instantaneous position of high-speed satellites as a known starting point and employ a spatial distance resection method to determine the location of the target point.

[0062] The Beidou satellite navigation system consists of three parts: the space segment, the ground segment and the user segment. It can provide high-precision, highly reliable positioning, navigation and timing services to all types of users around the world, all day and all weather. It also has short message communication capabilities and has preliminary regional navigation, positioning and timing capabilities. The positioning accuracy is at the decimeter and centimeter level, the speed measurement accuracy is 0.2 meters per second, and the timing accuracy is 10 nanoseconds.

[0063] Here, the signal simulation generator 10 can simulate only GPS satellite signals, only Beidou satellite signals, or both GPS satellite signals and Beidou satellite signals at the same time. Users can make a specific selection based on the specific scenario.

[0064] In some embodiments, the signal transmitter 30 is electrically connected to any signal output terminal of the power divider 20 via a radio frequency cable.

[0065] It's understandable that RF cable, also known as coaxial cable, consists of a coaxial inner conductor, an outer conductor, and a dielectric supporting the inner and outer conductors. RF cable is a crucial component of RF transmission in radio communications, broadcasting, and television. RF cable characteristics include electrical and mechanical properties. Electrical properties include characteristic impedance, transmission loss, frequency characteristics, temperature characteristics, shielding characteristics, rated power, and maximum withstand voltage. Mechanical properties include minimum bend radius, weight per unit length, maximum allowable tensile force, and cable aging characteristics and consistency. RF cable can transmit over a wide frequency band, is highly resistant to external interference, exhibits minimal antenna effect and radiation loss, and has a simple structure, easy installation, and is relatively economical.

[0066] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0067] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0069] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A satellite signal simulation system, characterized in that: include: A signal simulation generator configured to simulate a satellite signal; The signal simulation generator has the function of simulating a real satellite, including simulating the satellite's flight attitude, orbital dynamics, and the change process of the satellite's full-frame telemetry information flow in each measurement and control arc. It also has the function of generating highly dynamic navigation signals, testing the capture and tracking performance of receiving equipment, generating specific navigation signals, verifying the feasibility of test plans, and serving as a comparison standard and testing the dynamic measurement accuracy of navigation receivers. a power divider, wherein a signal input end of the power divider is electrically connected to a signal output end of the signal simulation generator, and the power divider has a plurality of signal output ends; wherein the power divider is used to equally divide the satellite signal generated by the signal simulation generator; A plurality of signal transmitters, wherein a signal input end of each signal transmitter is electrically connected to any signal output end of the power distributor, and the plurality of signal transmitters are spaced apart and distributed in a target area; It also includes: multiple adjustable attenuators, multiple adjustable attenuators are located between the power distributor and multiple signal transmitters, the signal input end of each adjustable attenuator is electrically connected to the signal output end of the power distributor, and the signal output end of each adjustable attenuator is electrically connected to the signal input end of any one of the signal transmitters; wherein the signal strength of the adjusted satellite signals output by the adjustable attenuators is the same.

2. The satellite signal simulation system according to claim 1, wherein: Also includes: A signal amplifier, wherein the signal input end of the signal amplifier is electrically connected to the signal output end of the signal simulation generator, and the signal output end of the signal amplifier is electrically connected to the signal input end of the power divider.

3. The satellite signal simulation system according to claim 2, characterized in that: Also includes: An attenuator, wherein the signal input end of the attenuator is electrically connected to the signal output end of the signal amplifier, and the signal output end of the attenuator is electrically connected to the signal input end of the power divider.

4. The satellite signal simulation system according to claim 1, wherein: The signal strengths of the adjusted satellite signals outputted from the signal output ends of the plurality of adjustable attenuators are the same.

5. The satellite signal simulation system according to any one of claims 1 to 3, characterized in that: The power divider comprises: a first sub-distributor, wherein a signal input terminal of the first sub-distributor is electrically connected to a signal output terminal of the signal simulation generator, and the first sub-distributor has a plurality of signal output terminals; The second sub-distributor, the signal input end of the second sub-distributor is electrically connected to any signal output end of the first sub-distributor, the second sub-distributor has multiple signal output ends, and the signal input end of each signal transmitter is electrically connected to any signal output end of the second sub-distributor.

6. The satellite signal simulation system according to claim 5, characterized in that: The first sub-distributor and / or the second sub-distributor is a 1-to-4 power distributor or a 1-to-8 power distributor.

7. The satellite signal simulation system according to any one of claims 1 to 3, characterized in that: The distance between adjacent signal transmitters is 3 meters to 20 meters.

8. The satellite signal simulation system according to any one of claims 1 to 3, characterized in that: The signal simulation generator is further configured to simulate GPS satellite signals and / or Beidou satellite signals.

9. The satellite signal simulation system according to any one of claims 1 to 3, characterized in that: The signal input end of the signal transmitter is electrically connected to any signal output end of the power distributor through a radio frequency cable.

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