CN-121978380-A - Switching system and method for satellite differential signal waveform measurement

CN121978380ACN 121978380 ACN121978380 ACN 121978380ACN-121978380-A

Abstract

The invention provides a switching system and a switching method for satellite differential signal waveform measurement, wherein the system comprises a differential signal matching and gating unit, an oscilloscope and a probe, wherein the differential signal matching and gating unit is used for selecting a measurement path of a differential signal, the oscilloscope and the probe are used for measuring the differential signal, a main control unit is used for sending a measurement instruction and controlling the differential signal matching and gating unit, the oscilloscope and the probe interact with the main control unit in a network mode, and the oscilloscope and the probe receive the measurement instruction of the main control unit and send a measurement result to the main control unit. The invention adopts an intensive design, solves the problems of multiple systems and disordered wiring in the satellite differential signal interface waveform measurement process, realizes one-time parallel access and serial measurement of multiple paths of differential signals, and greatly improves the safety and efficiency of the measurement process.

Inventors

LIU TINGYU
LI KUNJI
MAO ZHENGUO
MA KAIXIN
YANG HE

Assignees

上海卫星装备研究所

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (10)

1. A transit system for satellite differential signal waveform measurement, comprising: the differential signal matching and gating unit is used for selecting a measurement path of the differential signal; the oscilloscope and the probe are used for measuring differential signals; The main control unit is used for sending a measurement instruction and controlling the differential signal matching and gating unit, the oscilloscope and the probe; The oscilloscope and the probe interact with the main control unit in a network mode, receive the measurement instruction of the main control unit and send the measurement result to the main control unit.
2. The transit system for satellite differential signal waveform measurement according to claim 1, wherein said differential signal matching and gating unit comprises: the high-speed differential signal matching and gating unit is used for realizing the measurement path selection and impedance matching after the parallel access of not less than 8 pairs of TLK2711 differential signals; The medium-low speed differential signal and single-ended signal matching and gating unit is used for realizing the measurement path selection and impedance matching of at least 37 medium-low speed differential signals or the measurement path selection of 74 single-ended signals.
3. The transit system for satellite differential signal waveform measurement according to claim 1, wherein the master control unit comprises: the automatic control module is used for controlling the gating of the differential signals and the action of the oscilloscope; And the data analysis and summarization module is used for recording and analyzing the measurement results of the differential signals and forming a report.
4. The transit system for satellite differential signal waveform measurement according to claim 1, wherein the oscilloscope comprises an eye diagram measurement module, and the probe uses a differential probe without built-in termination resistance when making differential signal measurements.
5. The transit system for satellite differential signal waveform measurement according to claim 2, wherein said high-speed differential signal matching and gating unit comprises: The primary switch matrix module consists of four switch matrixes, which are connected with 16 paths of differential signals, and performs first-round signal selection, wherein 2 paths of differential signal positive lines and 2 paths of differential signal negative lines remain after the selection is completed; The second-stage switch matrix module consists of two alternative switch matrixes, performs second-round signal selection, and connects the left 1-path differential signal positive line and the left 1-path differential signal negative line to the measurement interface after the selection is completed; The high-speed impedance matching module consists of a three-in-one switch matrix, a multi-gear matching resistor and a combiner, and the matching resistor selection of the high-speed differential signal is realized by the control of the three-in-one switch matrix.
6. The transit system for satellite differential signal waveform measurement according to claim 2, wherein coaxial cables are used for connection between devices in the high-speed differential signal matching and gating unit, the interface is an SMA high-frequency interface, and both the radio-frequency device and the cable support DC-4 GHz frequency bands.
7. The transit system for satellite differential signal waveform measurement according to claim 2, wherein said medium-low speed differential signal and single-ended signal matching and gating unit comprises: The first relay module consists of 74 program-controlled relays, one end of a relay passage is connected with the 74 cores of the signal input connector in a one-to-one correspondence manner, and the other ends of the relay passages are mutually overlapped to perform differential signal positive line selection; The second relay module consists of 74 program-controlled relays, one end of a relay passage is connected with the 74 cores of the signal input connector in a one-to-one correspondence manner, and the other ends of the relay passages are mutually overlapped to select a differential signal negative line; The medium-low speed impedance matching module consists of a third relay module and a multi-gear matching resistor, and the third relay module controls the multi-gear matching resistor for realizing medium-low speed differential signals.
8. The switching system for satellite differential signal waveform measurement according to claim 7, wherein the relays selected by the first relay module, the second relay module and the third relay module are all electromagnetic relays supporting a DC-4 GHz frequency band, and are arranged on 3 PCBs according to the module distinction.
9. The transit system for satellite differential signal waveform measurement according to claim 2, wherein the matching resistance in the high-speed impedance matching module is classified into three stages, and the matching resistance in the medium-low speed impedance matching module is classified into five stages.
10. A switching method for satellite differential signal waveform measurement, employing the switching system for satellite differential signal waveform measurement according to any one of claims 1 to 9, comprising: Step S1, connecting a plurality of paths of differential signals output by a satellite to an input interface of a switching system through a switching cable, and connecting an oscilloscope probe to an output interface of the switching system; Step S2, enabling the main control unit to control the differential signal matching and gating unit to perform signal gating and impedance matching according to a preset test file; S3, controlling a satellite or a satellite-borne single machine to output a differential signal to be detected; Step S4, the main control unit sends a measurement instruction to the oscilloscope based on a preset test file, the oscilloscope and the probe carry out waveform measurement on the gated differential signals, and a measurement result is obtained; and S5, enabling the main control unit to receive a measurement result returned by the oscilloscope, and generating a test summary report after recording and analyzing.

Description

Switching system and method for satellite differential signal waveform measurement Technical Field The invention relates to the technical field of spacecraft signal measurement, in particular to a switching system and a switching method for satellite differential signal waveform measurement. Background The satellite is a complex information system, and various differential communication interfaces such as TLK2711, LVDS, RS-422 and 1553b are configured on the satellite according to different data transmission requirements. The reliability of these communication interfaces directly determines the implementation of satellite functions, and the output characteristic test thereof is therefore one of the key links of satellite testing. In the single machine acceptance and star loading test stage, the output waveforms of various electrical interfaces are required to be tested so as to ensure that various indexes of the signal interfaces meet the requirements. When signal output waveform test is carried out under the current technical condition, the test of multiple paths of signals in the same connector is difficult to complete at one time due to limited test resources and inconvenient wiring connection, and the test is realized by adding and removing power and plugging wiring for multiple times of satellites, so that the test efficiency is low and the safety is insufficient. Meanwhile, the test operation and the data recording have low automation degree, are seriously dependent on manual operation and are easy to cause human errors, and the test report generation lacks unified standards, the comparison of multipath signal quality lacks quantitative basis, and further the accuracy and comparability of test results are affected. The patent with the application number of CN112834965 provides an automatic testing device for a satellite electrical interface, which comprises a program-controlled junction box, a data acquisition module and a control analysis module, wherein the program-controlled junction box comprises at least one connector, at least one multiplexing switch, at least one bus and at least one tested interface, signals of a single machine to be tested are sequentially provided to the data acquisition module through the connector, the multiplexing switch, the bus and the tested interface, and the control analysis module provides a remote control instruction for the multiplexing switch according to the requirements of a user's test case so as to control the on-off of a channel of the multiplexing switch. However, the above patent can only test voltage and current signals such as single-machine supply voltage, power, surge and the like, and cannot realize impedance matching and serial automatic testing of multi-path and multi-type differential signals. The patent of application number CN106788787 provides a method for rapidly testing and analyzing satellite-borne high-speed LVDS parallel signals, which is suitable for parallel LVDS interfaces with various transmission rates and solves the technical problem that the high-speed LVDS parallel interfaces cannot be rapidly tested and accurately analyzed. The above patent still requires the measurement of multiple pairs of differential signals in a single connector by repeating the wiring and does not relate to the type of differential signals commonly used by other satellites. Disclosure of Invention In view of the drawbacks of the prior art, an object of the present invention is to provide a switching system and method for satellite differential signal waveform measurement. According to the invention, a transit system for satellite differential signal waveform measurement comprises: the differential signal matching and gating unit is used for selecting a measurement path of the differential signal; the oscilloscope and the probe are used for measuring differential signals; The main control unit is used for sending a measurement instruction and controlling the differential signal matching and gating unit, the oscilloscope and the probe; The oscilloscope and the probe interact with the main control unit in a network mode, receive the measurement instruction of the main control unit and send the measurement result to the main control unit. Preferably, the differential signal matching and gating unit includes: the high-speed differential signal matching and gating unit is used for realizing the measurement path selection and impedance matching after the parallel access of not less than 8 pairs of TLK2711 differential signals; The medium-low speed differential signal and single-ended signal matching and gating unit is used for realizing the measurement path selection and impedance matching of at least 37 medium-low speed differential signals or the measurement path selection of 74 single-ended signals. Preferably, the main control unit includes: the automatic control module is used for controlling the gating of the differential signals and the action of the oscillos