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Load electromagnetic compatibility prediction method for small satellite communication

A satellite communication and electromagnetic compatibility technology, applied in the field of small satellites, can solve problems such as mutual influence, mutual coupling, damage to receiving equipment, desensitization of the receiving system, etc., and achieve accurate calculation results

Active Publication Date: 2019-03-08
BEIJING RES INST OF TELEMETRY +1
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Commercial small satellites are small in size and highly integrated. In order to meet different mission requirements, multiple antennas need to be configured to work together. Due to on-board resource and space constraints, each load antenna is installed in a narrow and limited space, and most of them are arranged centrally on satellite pairs. On the ground, the antennas of multiple systems interact and couple with each other. Since the data transmission and measurement and control systems both work in the X-band, the frequency points are relatively close to each other, the signal strength of the data transmission system is high, and the receiving sensitivity of the measurement and control system is very high. The two systems simultaneously Work, high-power transmission and high-sensitivity reception coexist, the digital transmission system may desensitize the receiving system, or cause damage to the receiving equipment, seriously affecting the reliable operation of the measurement and control system
In order to improve the electromagnetic compatibility of the two systems, it is necessary to accurately obtain the isolation between the two systems. At present, the isolation between the small satellite systems mainly depends on the designer's simulation, estimation and physical testing. In the initial stage of system design, there are no test conditions. When the two systems When the antennas are far away, the space distance attenuation can be calculated according to the far-field conditions of the antennas to approximate the isolation. However, due to space constraints, the installation of small satellite system antennas often does not meet the far-field conditions and belongs to the near-field conditions. The coupling effect between antennas is in the Under complex boundary conditions, how to calculate the system isolation in the near field of the phased array antenna is crucial to the electromagnetic compatibility characteristics of satellite X-band data transmission and measurement and control systems

Method used

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  • Load electromagnetic compatibility prediction method for small satellite communication
  • Load electromagnetic compatibility prediction method for small satellite communication
  • Load electromagnetic compatibility prediction method for small satellite communication

Examples

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example 1

[0094] refer to figure 2 , shows an equivalent schematic diagram of a multi-port network in an embodiment of the present invention. Such as figure 2 , both the phased array antenna and the feed end of the measurement and control antenna are used as the ports of the network. Network characteristics, including input reflection coefficient, transmission coefficient, and output reflection coefficient.

[0095] The scattering parameters of the multi-port microwave network are defined as follows:

[0096]

[0097] Among them, a 1 、a 2 ,...,a n is the normalized incident wave at each port, b 1 , b 2 ,...,b n is the normalized reflected wave for each port.

[0098] a of the digital antenna port i and b i denote the unit incident wave and reflected wave respectively, b n Indicates the signal received by the receiving antenna. The phased array antenna is a phased array antenna with p units, the receiving antenna is a single port, the total number of units of the two ante...

example 2

[0112] Establish an antenna electromagnetic field analysis model according to the index requirements, add satellite platforms and antenna layout constraints, set boundary conditions, and establish a multi-port network.

[0113] Calculate the scattering parameters of the multi-port network to obtain the digital transmission frequency f t The scattering parameters below.

[0114] extract f t The transmission parameters in the first (n-1) scattering parameters at time, and the multi-port network of the same system is equivalent to a single-port network.

[0115] According to the equivalent single-port total power P t (f t ), set a i Different excitation amplitude and phase values, obtained at the digital transmission frequency f t Received power B under dynamic scan under n (f t ), the unit is dBm.

[0116] Equivalent single-port input power P t (f t ) is the transmit power of the digital transmission system, in dBm.

[0117] B by dynamic scanning n (f t ), calculate...

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Abstract

The invention discloses a load electromagnetic compatibility prediction method for small satellite communication. The method can analyze the mutual coupling situations among multiple load systems by adopting an antenna model and a load system multiport network, and can calculate the isolation among the systems by converting the multiport network into a single port equivalent analysis model, so that bases can be provided for the reasonable distribution of system indexes; and enough isolation can exist between transmit-receive systems during practical application, so that high power data transmission signals or bottom noise thereof can be prevented from entering a measurement and control receiving system due to insufficient isolation, and therefore, situations of receiving saturation or great reduction of receiving sensitivity can be avoided.

Description

technical field [0001] The invention belongs to the technical field of small satellites, in particular to an electromagnetic compatibility prediction method for small satellite communication loads. Background technique [0002] Commercial small satellites are small in size and highly integrated. In order to meet different mission requirements, multiple antennas need to be configured to work together. Due to on-board resource and space constraints, each load antenna is installed in a narrow and limited space, and most of them are arranged centrally on satellite pairs. On the ground, the antennas of multiple systems interact and couple with each other. Since the data transmission and measurement and control systems both work in the X-band, the frequency points are relatively close to each other, the signal strength of the data transmission system is high, and the receiving sensitivity of the measurement and control system is very high. The two systems simultaneously Work, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00H04B7/185
CPCG01R31/001H04B7/18576
Inventor 王冬冬丁晓磊郑戈
Owner BEIJING RES INST OF TELEMETRY
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