Spacecraft synchronization precision test system and spacecraft synchronization precision test method based on second pulse

Abstract

A spacecraft synchronization precision test system and a spacecraft synchronization precision test method based on second pulse are disclosed. The system comprises a navigation receiver simulator, a navigation receiver, a satellite-borne time management device, a second pulse using terminal, a logic analyzer, a ground power supply, a terminal ground test device, a navigation receiver ground inspection device, and a test client. The logic analyzer compares the control cycle pulse of the second pulse using terminal with a hardware second pulse signal provided by the navigation receiver to get the second pulse synchronization precision between the terminal and the navigation receiver. The system can acquire the actual parameter value of the control cycle pulse quickly by using a telemetry signal recorded by the second pulse using terminal. The second pulse synchronization precision can be calculated and tested conveniently and quickly according to the output value of hardware second pulse read by the logic analyzer.

Description

technical field [0001] The invention relates to a spacecraft synchronization precision test system and method based on pulse-per-second, and is especially suitable for testing the synchronization precision of pulse-per-second at a large satellite system level. Background technique [0002] The second pulse time management method is a mainstream technology to realize the precise time synchronization of spacecraft. First, the navigation receiver needs to lock the navigation signal normally, and output the whole second pulse (such as GPS navigation message and GPS time strictly correspond) signal under the control of the whole satellite command. And the absolute time information corresponding to the signal. After the pulse signal is amplified and divided by the timing and data storage unit, it is used as a trigger signal and sent to all on-board devices that require time synchronization processing through a dedicated cable. The absolute time information is then sent via the bu...

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Problems solved by technology

Taking the SAR remote sensing satellite as an example, during the high-resolution spotlight mode, in order to obtain rich and fine target information, the high-speed moving satellite will always irradiate the specific imaging area pre-stored by the satellite in a small area, which requires pre-setting The starting point of the working time of the spotlight mode is strictly synchronized with the on-board time comparison moment, and a slight difference in time error can cause a non-negligible decline in imaging performance

[0004] The name of Chinese patent CN201410623668.1 is a time synchronization system and method based on GPS / BD dual-mode timing service. The system includes a GPS / BD dual-mode receiver with an antenna, and a GPS / BD dual-mode receiver with an antenna. The second pulse G1pps output terminal and the second pulse B1pps output terminal are connected to the time sequence extraction and confirmation module, which realizes the second pulse synchronization, but does not involve the acquisition method of the second pulse synchronization accuracy

The title of Chinese patent CN201310734350.6 is a system and method for checking GPS time synchronization accuracy, including: GPS receiving unit, system clock, control unit and processing unit, GPS receiving unit generates a reference second pulse and sends it to the processing unit and obtains GPS time and Send the GPS system clock to the system clock, and the system clock receives the GPS time to complete the time synchronization. When the control unit monitors the system clock’s millisecond bit greater than the preset threshold, it sends the system second pulse to the processing unit. The processing unit is used to generate the rising edge of the reference second pulse and the system The rising edge of the second pulse, and calculate the time difference between the rising edge of the reference second pulse and the rising edge of the system second pulse, and the accuracy of GPS time synchronization can be obtained by calculating the time difference. This method is a system time calibration method and does not involve the use of the second pulse. The synchronization accuracy test of the

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