Method and device for calculating device-to-ground telemetry demodulation time delay
A technology of demodulation delay and calculation method, which is applied in the field of spacecraft measurement and control, can solve the problems of long calculation time and complicated process, and achieve the effect of simple calculation
Active Publication Date: 2021-03-05
NO 63921 UNIT OF PLA
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[0005] Based on this, the embodiment of the present invention provides a method and device for calculating the delay of device-ground telemetry demodulation to solve the problem of complex process and long calculation time of the traditional demodulation delay method
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[0043] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details.
[0044] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0045] see figure 1 , which is a schematic flow diagram of an embodiment of the calculation method for the device-to-ground telemetry demodulation delay provided in this embodiment, and is described in detail as follows:
[0046]Step S101, respectively acquire the first telemetry signal of the detector in the state of the first code rate, and the second telemetry signal of the detector in the state of the second code rate, wherein the first code rate is great...
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The invention relates to the technical field of spacecraft measurement and control, and provides a device-to-ground telemetry demodulation time delay calculation method and device, and the method comprises the steps: obtaining telemetry signals of a detector in a first code rate state and a second code rate state, and enabling the first code rate to be greater than the second code rate, wherein the device-to-ground telemetry demodulation time delay of the first code rate is proportional to the device-to-ground telemetry demodulation time delay of the second code rate; demodulating the telemetry signal to obtain a first telemetry data frame and a second telemetry data frame, each telemetry data frame comprising on-device time during generation and ground time during completion of demodulation; and based on the difference between the on-board time and the ground time of the first telemetry data frame, the time difference between the on-board time and the ground time of the second telemetry data frame and the time delay proportional relation, determining the on-board telemetry demodulation time delay. According to the invention, under the condition that the detector has no GPS time service, an oscilloscope is not needed, and the telemetering demodulation time delay between the detector and the ground can be simply and conveniently calculated.
Description
technical field [0001] The invention relates to the technical field of space vehicle measurement and control, in particular to a calculation method and device for time delay of space vehicle telemetry demodulation. Background technique [0002] In my country's lunar and deep space exploration missions, how to ensure high-precision time on the probe is an important issue related to the success or failure of the mission. In important links such as the probe's planetary capture, power down, and probe rendezvous and docking, the time accuracy of the probe is very high, generally 5ms or even more than 1ms. Due to the long flight distance, the detector is not equipped with a GPS (Global Positioning System, Global Positioning System) receiver, that is, the time accuracy of the detector cannot be guaranteed by means of near-earth satellite GPS timing, which requires the ground to complete high-precision positioning of the detector. School hours. Therefore, accurately finding out t...
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IPC IPC(8): H04B17/364H04L12/26H04B7/185
CPCH04B17/364H04L43/0852H04B7/18519
Inventor 程承徐得珍陈少伍李臻
Owner NO 63921 UNIT OF PLA