Method and simulation system for measuring wireless signal link transmission in launch vehicle

Abstract

The present invention discloses a method and a simulation system for measuring wireless signal link transmission on a launch vehicle. The method comprises step S1, obtaining the signal transmission power #imgabs0#, calculating the receiving power P according to the signal transmission mode, r ; Step S2, if the received power P r If it is not within the receiving sensitivity range, the modules of the signal propagation path are gradually adjusted to obtain a combination of adjustable modules, and a combination of screening modules is selected; step S3, the optimal module combination is selected according to the influencing factors. The present invention improves the test efficiency and reliability, quantifies the parameters of the transmission power, transmission antenna gain, receiving antenna gain, feeder loss of uplink and downlink, and propagation path loss in the wireless signal link, and determines whether the result is higher than the single-machine or comprehensive measurement receiving sensitivity and is within the dynamic range by calculating the receiving power, so as to provide a theoretical basis for the design of indicators such as the adjustable attenuator gain adjustment range and the transmission power of products and equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless link digital data analysis, and in particular, relates to a method and a simulation system for measuring wireless signal link transmission on a launch vehicle. Background Art

[0002] During the launch vehicle test, wireless signals are responsible for parameter measurement and data transmission. However, the test environment is complex and changeable, and wireless signals are easily affected by a variety of factors, which reduces the receiving power of wireless signals on a single machine on the rocket or on the ground. Once the receiving power is too low, even lower than the receiving sensitivity of a single machine or comprehensive test, it will cause signal distortion or even signal loss, seriously affecting the test process. Therefore, ensuring that the wireless signal strength is in the optimal range during the test is crucial to improving the stability and reliability of the launch vehicle test.

[0003] There are many factors that affect the link gain of wireless signal transmission, such as transmission power, transmission antenna gain, receiving antenna gain, uplink and downlink feeder loss, and propagation path loss, which leads to complex calculations and large errors. At present, the link gain of wireless signal mainly relies on the designer's experience calculation, and the entire wireless signal transmission situation is determined by comprehensively estimating the gain of each component of the link. This method has the disadvantages of poor timeliness, low efficiency, and large errors.

[0004] The existing document CN109561446A discloses a method for optimizing a wireless network in a high-speed rail scenario, wherein the method includes: obtaining a reference signal transmission power at a signal receiving sampling point, calculating the antenna gain at the signal receiving sampling point, the path loss of the radio wave propagation of the transmitting antenna, and the penetration loss of the radio wave transmitted by the transmitting antenna; obtaining the reference signal receiving power RSRP received by the signal receiving end according to the reference signal transmission power, antenna gain, path loss, and penetration loss; obtaining the swept frequency RSRP, fitting the swept frequency RSRP with the reference signal receiving power RSRP, obtaining the fitting environmental factor and the fitting path loss, and constructing a radio wave transmission model for a high-speed rail scenario; based on the radio wave transmission model for a high-speed rail scenario, optimizing the wireless network in a high-speed rail scenario. This patent is aimed at optimizing wireless networks in high-speed rail scenarios, and does not involve special environmental requirements in the field of launch vehicles. It also lacks the content of gradually adjusting and combining multiple modules to determine the optimal module combination, and has deficiencies in planning attenuation values ​​and designing for specific structures.

[0005] In summary, in order to solve the above existing problems, a fast and accurate wireless signal gain calculation method and simulation system are urgently needed. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a method and a simulation system for measuring wireless signal link transmission in a launch vehicle.

[0007] A method for measuring wireless signal link transmission on a launch vehicle provided by the present invention comprises the following steps:

[0008] Step S1, obtaining the transmit power of the transmit power module , calculate the transmission power loss according to the signal transmission mode, and obtain the receiving power P received by the receiving module r ;

[0009] Step S2, determine the received power P r Is it within the receiving sensitivity range of the device? If the receiving power P r Within the receiving sensitivity range, the optimization ends; if the receiving power P r If it is not within the receiving sensitivity range, the step of screening modules is entered to obtain multiple screening module combinations.

[0010] Step S3, selecting the best module combination from all the screened module combinations to optimize the transmission of the launch vehicle measurement wireless signal link.

[0011] Preferably, in step S1, the signal is transmitted through five modules, namely: a transmitting power module, an arrow / shielding cover transmitting antenna gain module, a free space loss module, a shielding cover / arrow receiving antenna gain module, and a downlink / uplink high-frequency cable attenuation module.

[0012] Preferably, in step S1, the transmission loss of the signal includes free space loss and downlink / uplink high-frequency cable attenuation, wherein the calculation formula of the free space loss is as follows:

[0013]

[0014] in, is the transmitting frequency, is the radial distance from the shield to the antenna on the arrow, It is the free space loss;

[0015] The calculation formula for the downlink / uplink high-frequency cable attenuation is as follows:

[0016]

[0017] in, is the attenuation of the upstream or downstream high-frequency cable, is the attenuation of high frequency cable per unit length, is the length of the cable, Factors affecting the material and shape of the high-frequency cable itself;

[0018] The received signal power P r = - - .

[0019] Preferably, in step S2, the screening module step includes the following sub-steps:

[0020] Step S2.1, calculate the received power P r The difference between the sensitivity of the device and the target adjustable value B is obtained;

[0021] Step S2.2, combining the five modules to obtain 31 adjustable module combinations;

[0022] Step S2.3, screening each adjustable module combination to obtain multiple screening module combinations.

[0023] Preferably, in step S2.2, the combination method is: select k modules from the five modules for combination, k=1...5, and obtain Adjustable module combination.

[0024] Preferably, step S2.3 includes: adding the attenuation adjustable amounts of the modules in the adjustable module combination to obtain the total adjustable amount of the adjustable module combination; if the total adjustable amount is greater than or equal to the target adjustable amount, the adjustable module combination is a screening module combination.

[0025] Preferably, step S3 includes the following sub-steps:

[0026] Step S3.1, calculating the influence factor of each module in each screening module combination to obtain the allocation adjustable amount of each module;

[0027] Step S3.2, calculating the cost of each module according to the allocated adjustable amount;

[0028] Step S3.3, based on the cost value, calculating the total cost value of each screening module combination;

[0029] Step S3.4, select the combination with the smallest total cost value among all the screening module combinations, which is the optimal module combination.

[0030] Preferably, step S3.1 includes the following sub-steps:

[0031] Step S3.1.1, calculating the influence factor of the module, where the influence factor of the module is the ratio of the attenuation adjustable amount of the module to the sum of the attenuation adjustable amounts of all modules in the screening module combination;

[0032] Step S3.1.2, multiply the impact factor by the target adjustable amount to obtain the allocated adjustable amount of the module.

[0033] Preferably, in step S3.2, the cost value of the module is the product of the allocated adjustable amount of the module and the cost of increasing the unit frequency of the module.

[0034] The present invention also provides a simulation system for measuring wireless signal link transmission on a launch vehicle, including a transmitting power module, an on-rocket / shielding cover transmitting antenna gain module, a shielding cover / on-rocket receiving antenna gain module, a free space loss module, a downlink / uplink high-frequency cable attenuation module, and a receiving power module;

[0035] The transmission power module is used to provide signal transmission power;

[0036] The arrow-on / shield transmitting antenna gain module is used to perform gain processing on the transmitting signal;

[0037] The free space loss module is used to simulate the loss of signals propagating in space;

[0038] The shield cover / on-arrow receiving antenna gain module is used to perform gain processing on the received signal;

[0039] The downlink / uplink high-frequency cable attenuation module is used to simulate the attenuation of the cable to the signal;

[0040] The receiving power module is used to receive the processed signal and determine the receiving power;

[0041] The transmitting power of the transmitting power module is transmitted to the receiving power module through the arrow / shielding cover transmitting antenna gain module, the free space loss module, the shielding cover / arrow receiving antenna gain module and the down / up high-frequency cable attenuation module. If the receiving power received by the receiving power module is within the receiving sensitivity range of the equipment, the optimization is terminated; otherwise, according to the target attenuation value, the transmitting power module, the arrow / shielding cover transmitting antenna gain module, the shielding cover / arrow receiving antenna gain module, the free space loss module and the down / up high-frequency cable attenuation module are continuously adjusted through the above-mentioned method of measuring wireless signal link transmission by a launch vehicle to achieve the receiving power within the receiving sensitivity range.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention fully considers the wireless signal link propagation process in engineering practice, selects adjustable modules according to given target adjustable quantities, and reasonably allocates the adjustable quantities of the selected modules by calculating the influence factors of the five modules in the transmission path, so that the optimization of link component parameters is faster, the link signal calculation time is greatly shortened, and the component parameters in the wireless link can be adjusted scientifically and effectively, providing economic considerations for the production of products and equipment.

[0044] 2. When the link signal frequency is affected by multiple factors, the present invention divides the influencing factors into modules, defines the adjustable attenuation according to the module characteristics, calculates the influence factor of each module in the signal link, and then selects the adjustment module combination according to the receiving sensitivity of the equipment and the cost value of each module. Finally, adjustments are made according to the proportion of each module in the module combination, which shortens the equipment selection time when the equipment is put into production, reduces the risk of misinvestment, improves the utilization rate of equipment resources, saves costs, and meets the requirements of convenience, speed and high cost performance.

[0045] 3. The present invention improves test efficiency and reliability, quantifies the parameters of transmission power, transmission antenna gain, receiving antenna gain, uplink and downlink feeder loss, and propagation path loss in the wireless signal link, automatically calculates the receiving power through a general calculation model, and determines whether the result is higher than the single-machine or comprehensive measurement receiving sensitivity and is within the dynamic range, thereby providing a theoretical basis for the design of indicators such as the adjustable attenuator gain adjustment range, and the transmission power, receiving sensitivity, and dynamic range of products and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0047] Figure 1 A diagram of a simulation system for measuring wireless signal link transmission for a launch vehicle in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0049] Embodiment 1:

[0050] This embodiment provides a method for measuring wireless signal link transmission on a launch vehicle, comprising the following steps:

[0051] Step S1, obtaining the transmit power of the transmit power module , calculate the transmission power loss according to the signal transmission mode, and obtain the receiving power P received by the receiving module r .

[0052] In this embodiment, the signal is transmitted through five modules, namely: a transmitting power module, an arrow / shielding cover transmitting antenna gain module, a free space loss module, a shielding cover / arrow receiving antenna gain module, and a downlink / uplink high-frequency cable attenuation module.

[0053] Specifically, the signal transmission loss includes free space loss and downlink / uplink high-frequency cable attenuation, wherein the free space loss is calculated as follows:

[0054]

[0055] in, is the transmitting frequency, is the radial distance from the shield to the antenna on the arrow, It is the free space loss;

[0056] The calculation formula for the downlink / uplink high-frequency cable attenuation is as follows:

[0057]

[0058] in, is the attenuation of the upstream or downstream high-frequency cable, is the attenuation of high frequency cable per unit length, is the length of the cable, Factors affecting the material and shape of the high-frequency cable itself;

[0059] The received signal power P r = - - .

[0060] Step S2, determine the received power P r Is it within the receiving sensitivity range of the device? If the receiving power P r Within the receiving sensitivity range, the optimization ends; if the receiving power P r If it is not within the receiving sensitivity range, the step of screening modules is entered to obtain multiple screening module combinations.

[0061] Specifically, the screening module step includes the following sub-steps:

[0062] Step S2.1, calculate the received power P r The difference between the sensitivity of the device and the target adjustable value B is obtained.

[0063] Step S2.2, combining the five modules to obtain 31 adjustable module combinations.

[0064] In this embodiment, the combination method is: select k modules from the five modules for combination, k=1...5, and obtain Adjustable module combination.

[0065] Step S2.3, screening each adjustable module combination to obtain multiple screening module combinations.

[0066] Specifically, the attenuation adjustable amounts of the modules in the adjustable module combination are added to obtain the total adjustable amount of the adjustable module combination. If the total adjustable amount is greater than or equal to the target adjustable amount, the adjustable module combination is a screening module combination.

[0067] Step S3, selecting the best module combination from all the screened module combinations to optimize the transmission of the launch vehicle measurement wireless signal link.

[0068] Specifically, step S3 includes the following sub-steps:

[0069] Step S3.1, calculating the influence factor of each module in each screening module combination to obtain the allocation adjustable amount of each module.

[0070] More specifically, step S3.1 includes the following sub-steps:

[0071] Step S3.1.1, calculating the influence factor of the module, where the influence factor of the module is the ratio of the attenuation adjustable amount of the module to the sum of the attenuation adjustable amounts of all modules in the screening module combination;

[0072] Step S3.1.2, multiply the impact factor by the target adjustable amount to obtain the allocated adjustable amount of the module.

[0073] Step S3.2, calculating the cost of each module according to the allocated adjustable amount.

[0074] Specifically, the cost value of a module is the product of the module's allocation adjustable amount and the module's unit frequency increase cost. Step S3.3, based on the cost value, calculate the total cost value of each screening module combination.

[0075] Step S3.4, select the combination with the smallest total cost value among all the screening module combinations, which is the optimal module combination.

[0076] Embodiment 2:

[0077] This embodiment takes a certain type of launch vehicle as an example to illustrate the method for measuring wireless signal link transmission on a launch vehicle of the present invention.

[0078] Step S1, obtain the transmission power of the transmission power module M1 (current comprehensive test) After the signal passes through the arrow / shielding cover transmitting antenna gain module M2, the free space loss module M3, the shielding cover / arrow receiving antenna gain module M4, and the downlink / uplink high-frequency cable attenuation module M5, the received power of the link is obtained. dBm.

[0079]

[0080] The preset adjustable attenuation amount A1 of M1 is 5dB, the adjustable attenuation amount A2 of M2 is 5dB, the adjustable attenuation amount A3 of M3 is 3dB, the adjustable attenuation amount A4 of M4 is 3dB, the adjustable attenuation amount A5 of M5 is 5dB, the cost of increasing the unit frequency of M1 is d1, the cost of increasing the unit frequency of M2 is d2, the cost of increasing the unit frequency of M3 is d3, the cost of increasing the unit frequency of M4 is d4, and the cost of increasing the unit frequency of M5 is d5. Among them, d1, d2, d3, d4 and d5 can be adjusted according to the actual situation of the equipment.

[0081] Step S2, the sensitivity of a single machine is , receiving sensitivity range , receiving power If it is not within the receiving sensitivity range, enter the screening module step:

[0082] Step S2.1, calculate the target adjustable amount B = 7 .

[0083] Step S2.2, select k modules from the above five modules to combine, k = 1...5, and get Adjustable module combination.

[0084] Step S2.3, screening each adjustable module combination, that is, adding up the attenuation adjustable amounts of the modules in the adjustable module combination to obtain the total adjustable amount of the adjustable module combination.

[0085] In this embodiment, taking the adjustable module combination Q1 as an example, Q1 is a combination of M1 and M2, and the total adjustable amount of Q1 = A1 + A2 = 5 + 5 = 10 , since 10 is greater than the target adjustable amount by 7dB, Q1 is a screening module combination.

[0086] Step S3 includes:

[0087] Step S3.1, calculating the influence factor of each module in each screening module combination to obtain the allocation adjustable amount of each module.

[0088] In Q1 of this embodiment, = ×7=3.5dB, .

[0089] Step S3.2, according to the module's allocated adjustable amount, calculate the module's cost value, the formula is as follows:

[0090] Cost Value ; Cost Value .

[0091] Step S3.3, based on the cost values ​​of the modules, calculate the total cost value of each screening module combination.

[0092] Total generation value of Q1 = + .

[0093] Step S3.4, select the combination with the smallest total cost value among all the screening module combinations, which is the optimal module combination.

[0094] Embodiment 3:

[0095] Figure 1 A diagram of a simulation system for measuring wireless signal link transmission for a launch vehicle in an embodiment of the present invention.

[0096] like Figure 1 As shown, this embodiment discloses a simulation system for measuring wireless signal link transmission of a launch vehicle. The system can be implemented by executing the process steps of a method for measuring wireless signal link transmission of a launch vehicle, that is, those skilled in the art can understand a method for measuring wireless signal link transmission of a launch vehicle as a preferred implementation of a simulation system for measuring wireless signal link transmission of a launch vehicle.

[0097] The simulation system includes a transmitting power module, an arrow-mounted / shielded cover transmitting antenna gain module, a shielding cover / arrow-mounted receiving antenna gain module, a free space loss module, a downlink / uplink high-frequency cable attenuation module, and a receiving power module;

[0098] The transmission power module is used to provide signal transmission power;

[0099] The arrow-on / shield transmitting antenna gain module is used to perform gain processing on the transmitting signal;

[0100] The free space loss module is used to simulate the loss of signals propagating in space;

[0101] The shield cover / on-arrow receiving antenna gain module is used to perform gain processing on the received signal;

[0102] The downlink / uplink high-frequency cable attenuation module is used to simulate the attenuation of the cable to the signal;

[0103] The receiving power module is used to receive the processed signal and determine the receiving power;

[0104] The transmitting power of the transmitting power module is transmitted to the receiving power module through the arrow / shielding cover transmitting antenna gain module, the free space loss module, the shielding cover / arrow receiving antenna gain module and the down / uplink high-frequency cable attenuation module. If the receiving power received by the receiving power module is within the receiving sensitivity range of the device, the optimization is terminated; otherwise, according to the target attenuation value, the transmitting power module, the arrow / shielding cover transmitting antenna gain module, the shielding cover / arrow receiving antenna gain module, the free space loss module and the down / uplink high-frequency cable attenuation module are continuously adjusted through a method for measuring wireless signal link transmission by a launch vehicle in the above-mentioned embodiment 1 to achieve the receiving power within the receiving sensitivity range.

[0105] The system can more scientifically plan the attenuation value of each influencing module, reduce the investment in manpower and time costs, and also provide theoretical guidance for the shielding cover structure design and equipment indicator selection.

[0106] Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any simple modification, equivalent change and modification made to the above embodiment according to the essence of the present invention without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.

[0107] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0108] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for measuring wireless signal link transmission in a launch vehicle, characterized in that: The steps include: Step S1, obtaining the transmit power of the transmit power module , calculate the loss of the transmission power according to the signal transmission mode, and obtain the receiving power P received by the receiving module r ; In the step S1, the signal is transmitted through five modules, namely: a transmitting power module, an arrow / shielding cover transmitting antenna gain module, a free space loss module, a shielding cover / arrow receiving antenna gain module, and a downlink / uplink high frequency cable attenuation module; Step S2, determining the received power P r Is it within the receiving sensitivity range of the device? If the receiving power P r Within the receiving sensitivity range, the optimization is terminated; if the receiving power P r If it is not within the receiving sensitivity range, the step of screening modules is entered to obtain multiple screening module combinations; The steps of screening module include: Step S2.1, calculating the received power P r The difference between the sensitivity of the device and the target adjustable value B is obtained; Step S2.2, combining the five modules to obtain 31 adjustable module combinations; Step S2.3, screening each adjustable module combination to obtain multiple screening module combinations, Step S3, selecting the best module combination from all the screened module combinations to optimize the transmission of the launch vehicle measurement wireless signal link, wherein the step of selecting the best module combination includes: Step S3.1, calculating the influence factor of each module in each of the screening module combinations to obtain the allocation adjustable amount of each module; Step S3.2, calculating the cost of each module according to the allocated adjustable amount; Step S3.3, based on the cost value, calculating the total cost value of each screening module combination; Step S3.4, select the combination with the smallest total cost value among all the screening module combinations, which is the optimal module combination.

2. The method for measuring wireless signal link transmission in a launch vehicle according to claim 1, characterized in that: In step S1, the transmission loss of the signal includes free space loss and downlink / uplink high-frequency cable attenuation, wherein the free space loss is calculated as follows: in, is the transmitting frequency, is the radial distance from the shield to the antenna on the arrow, It is the free space loss; The calculation formula for the downlink / uplink high frequency cable attenuation is as follows: in, is the attenuation of the upstream or downstream high-frequency cable, is the attenuation of high frequency cable per unit length, is the length of the cable, Factors affecting the material and shape of the high-frequency cable itself; The received power P of the signal r = - - .

3. A method for measuring wireless signal link transmission in a launch vehicle according to claim 2, characterized in that: In step S2.2, the combination method is: select k modules from the five modules for combination, k=1...5, and obtain Adjustable module combination.

4. A method for measuring wireless signal link transmission in a launch vehicle according to claim 3, characterized in that: The step S2.3 includes: adding the attenuation adjustable amounts of the modules in the adjustable module combination to obtain the total adjustable amount of the adjustable module combination; if the total adjustable amount is greater than or equal to the target adjustable amount, the adjustable module combination is a screening module combination.

5. A method for measuring wireless signal link transmission in a launch vehicle according to claim 4, characterized in that: The step S3.1 includes the following sub-steps: Step S3.1.1, calculating the influence factor of the module, the influence factor of the module being the ratio of the adjustable attenuation amount of the module to the sum of the adjustable attenuation amounts of all modules in the screening module combination; Step S3.1.2, multiplying the impact factor by the target adjustable amount to obtain the allocated adjustable amount of the module.

6. A method for measuring wireless signal link transmission in a launch vehicle according to claim 5, characterized in that: In the step S3.2, the cost value of the module is the product of the allocated adjustable amount of the module and the unit frequency increase cost of the module.

7. A simulation system for measuring wireless signal link transmission in a launch vehicle, characterized in that: It includes a transmitting power module, an arrow / shielding cover transmitting antenna gain module, a shielding cover / arrow receiving antenna gain module, a free space loss module, a downlink / uplink high frequency cable attenuation module and a receiving power module; The transmission power module is used to provide signal transmission power; The arrow-on / shielding cover transmitting antenna gain module is used to perform gain processing on the transmitting signal; The free space loss module is used to simulate the loss of signals propagating in space; The shielding cover / on-arrow receiving antenna gain module is used to perform gain processing on the received signal; The downlink / uplink high-frequency cable attenuation module is used to simulate the attenuation of the cable to the signal; The receiving power module is used to receive the processed signal and determine the receiving power; The transmitting power of the transmitting power module is transmitted to the receiving power module through the arrow / shielding cover transmitting antenna gain module, the free space loss module, the shielding cover / arrow receiving antenna gain module and the down / up high-frequency cable attenuation module. If the receiving power received by the receiving power module is within the receiving sensitivity range of the device, the optimization is terminated; otherwise, according to the target attenuation value, the transmitting power module, the arrow / shielding cover transmitting antenna gain module, the shielding cover / arrow receiving antenna gain module, the free space loss module and the down / up high-frequency cable attenuation module are continuously adjusted through a method for measuring wireless signal link transmission on a launch vehicle as described in any one of claims 1-6 to achieve the receiving power within the receiving sensitivity range.

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