Passive intermodulation test method suitable for whole satellite

A technology of passive intermodulation and testing methods, which is applied in the field of spacecraft testing, can solve problems affecting the carrier-to-noise ratio of receivers and the amplitude of passive intermodulation products, and achieve the effect of saving development time

Pending Publication Date: 2022-01-18
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Application Information

AI Technical Summary

Problems solved by technology

Operations such as disassembly and installation of the link will affect the amplitude of passive intermodulation products, thereby affecting the carrier-to-noise ratio and sensitivity of the uplink injection receiver

Method used

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  • Passive intermodulation test method suitable for whole satellite

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Embodiment Construction

[0024] The present invention will be further elaborated below in conjunction with embodiment.

[0025] Such as figure 1 As shown, the specific steps include:

[0026] S1. Power on the whole satellite and the navigation sub-system, the whole satellite wireless only opens the navigation uplink injection load, and the navigation downlink amplifier and modulator are not turned on;

[0027] S2. The navigation subsystem establishes an uplink link. By adjusting the level of the uplink injection signal, the step of the level signal is 1-3dB, and the linear region of the carrier-to-noise ratio estimation is obtained;

[0028] S3. When confirming that the carrier-to-noise ratio estimate is 0X10, adjust the uplink injection signal level in the linear region of the carrier-to-noise ratio estimate, so that the carrier-to-noise ratio flag bit of the telemetry return is displayed as 0X10, and record the uplink signal level at this moment as P 1 ;

[0029] S4. Power up other radio frequen...

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Abstract

The invention relates to a passive intermodulation test method suitable for a whole satellite, and the method comprises the steps: S1, the whole satellite is added, and a navigation subsystem is powered up; S2, establishing an uplink link of the navigation subsystem; S3, adjusting the level of the uplink injection signal, enabling the carrier-to-noise ratio flag bit transmitted back by telemetering to be displayed as 0 * 10, and recording the level of the uplink signal as P1 at the moment; S4, enabling other radio frequency systems of the whole satellite to be powered up, and turning on wireless signals, so at the moment, the carrier-to-noise ratio estimated value is decreased; S5, by increasing the level of the uplink injection signal to P2, recovering the airborne noise ratio of the uplink injection receiver to the state 0 * 10 before other wireless signals are started up; S6, calculating the increment P2-P1 of the uplink injection level before and after the radio frequency channels of the navigation downlink and other subsystems are started, so as to evaluate the final assembly technical state of the satellite. According to the method, the influence of the passive intermodulation product generated in the final installation state on the uplink is determined, and data proof is provided for satellite final assembly technology state confirmation and satellite delivery.

Description

technical field [0001] The invention relates to a passive intermodulation test method suitable for the whole star, which is suitable for the passive intermodulation test of the whole star in the state of a microwave darkroom, and belongs to the technical field of spacecraft testing Background technique [0002] Both the uplink and downlink frequency bands of navigation satellites are in the L frequency band. The downlink RNSS (Radio Navigation Satellitesystem) signal has a relatively large output power due to the requirement of EIRP (Effective Isotropic Radiated Power) transmission, and the satellite uplink receiver has high sensitivity. Active intermodulation can be eliminated by configuring a reasonable filter. The amplitude of the passive intermodulation (PIM) product is much lower than the amplitude of the transmitted signal. The passive intermodulation product of the modulated signal is a broadband with the same magnitude as the transmitted signal bandwidth. Signals, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/336H04W24/06
CPCH04B17/336H04W24/06
Inventor 刘哲王妍曹多梅申洋赫
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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