CN115372688A - Method for accurately measuring object separation time sequence - Google Patents

Abstract

The invention belongs to the technical field of aerospace and discloses a method for accurately measuring an object separation time sequence. The method for accurately measuring the object separation time sequence comprises the steps of determining the number of separation time sequence measurement channels, determining a channel measurement operation mode, determining the time recording precision of the measurement channels, designing a data acquisition coding mode, performing a separation test and recording test data. The method for accurately measuring the object separation time sequence uses the interruption information of optical signals or electric signals to represent the separation characteristics of objects, and measures the interruption time of signals in each channel transmission line by arranging multi-channel signal transmission lines on monitoring nodes at the object separation positions to obtain the high-precision time sequence information of object separation. The method for accurately measuring the object separation time sequence is used for performing high-precision time sequence measurement on the object separation process in the events of explosion, impact and high-speed flight, and is particularly suitable for occasions with short separation process, high time sequence measurement precision and measurement data needing remote measurement and wireless transmission.

Description

A Method for Accurately Measuring the Separation Timing of Objects

technical field

The invention belongs to the field of aerospace technology, and in particular relates to a method for accurately measuring the time sequence of object separation.

Background technique

In the field of aerospace technology, there are often events such as control and separation of multiple objects. In such separation events, accurate measurement of the separation timing information between objects is of great value to achieve accurate control of aircraft attitude, orbit and other parameters.

In such object separation events, whether explosive separation, mechanical separation or thermal fusion separation is used, it is difficult to achieve the ideal state of the separation process, that is, the expected ideal state cannot be maintained throughout the entire process from the start of the separation to the end of the separation process. Separation distance or separation speed. Therefore, by measuring the separation process of related objects, it is of great significance to accurately obtain the separation time series data of the monitoring nodes required in the separation process, which is of great significance for evaluating the separation effect and improving the control accuracy of the motion parameters of the flying target.

At present, the method of measuring the separation between objects is mainly the optical imaging method, which can directly obtain the image data of the separation process, but in the occasions where the separation speed of the object is high, and the data needs to be transmitted wirelessly, or there is light interference in the separation process, etc. , this method is difficult to obtain effective measurement data. For example, in the case where the separation speed of the object is high and the data needs to be transmitted by telemetry wirelessly, in order to obtain a clear image during the separation process, it is necessary to increase the frame rate of optical imaging, but it is difficult to increase the frame rate without limit, and increasing the imaging frame rate will cause Generate a large amount of data that exceeds the limit of the wireless transmission rate of telemetry data. For example, when the separation speed of the object is 100m/s, in order to obtain a clear image of the separation process, the optical imaging adopts a frame rate of 1000 frames per second, and each clear image is 1Mb It is estimated that the amount of data generated per second is 1000Mb, far exceeding the capability of the current general telemetry wireless data transmission rate (such as the S-band maximum of about 20Mbps).

Aiming at the measurement requirements of this kind of separation problem, the present invention proposes a method for accurately measuring the timing sequence of object separation by using the high transient recognition processing mode of the multi-channel interrupt signal.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for accurately measuring the timing of object separation.

The method for accurately measuring the timing of object separation of the present invention comprises the following steps:

S10. Clearly separate the number of timing measurement channels;

According to the application requirements, determine the monitoring nodes that need to measure the time series during the separation process of the object to be measured, arrange a measurement channel at each monitoring node, and specify the number of all channels required for separation time series measurement, that is, the number of measurement channels M;

S20. Specify the channel measurement operation mode;

According to the characteristics of the separation environment of the object to be measured or the measurement requirements, specify the measurement signal interruption mode of each channel;

S30. Determine the time recording accuracy of the measurement channel;

According to the measurement requirements, clarify the time measurement accuracy of the object separation sequence, and then determine the measurement time record accuracy of each channel;

S40. Designing a data acquisition and encoding method;

According to the number of measurement channels M, measurement operation mode and measurement channel time recording accuracy ΔT, the acquisition and encoding method of measurement channel interruption data is designed. The specific steps are as follows:

S41. Identify the change of the electrical signal corresponding to each channel, and specify the interruption time of the electrical signal corresponding to each channel;

S42. encoding and recording the signal interruption time of each channel and the corresponding channel number;

The code length L1 of the interrupt time is determined by the measurement channel time recording accuracy ΔT and the timing length T, L1=int[log ₂ (T/ΔT)]+1, the code length L2 of the channel number is determined by the number of measurement channels M, L2=int [log ₂ M]+1;

S50. Carry out a separation test and record the test data.

Further, the measurement signal interruption method in step S20 includes the optical signal measurement operation mode transmitted by optical fiber, or the electrical signal measurement operation mode transmitted by metal wire; in the range of -40°C to 150°C, select the optical signal transmitted by optical fiber The measurement operation mode first converts the optical signal into an electrical signal through a photoelectric conversion circuit, and then judges whether the measurement signal is interrupted; above 150°C, selects a metal wire with excellent electrical conductivity whose melting point is higher than the ambient temperature as the electrical signal transmission measurement method.

The method for accurately measuring the separation timing of objects of the present invention uses the interruption information of optical signals or electrical signals to characterize the separation characteristics of objects, and measures the signal in each channel transmission line by arranging multi-channel signal transmission lines on the required monitoring nodes at the object separation position. At the moment of interruption, time-series data of object separation with a small amount of data and a measurement accuracy of nanosecond level is obtained.

The method for accurately measuring the timing of object separation in the present invention is mainly used for high-precision timing measurement of the object separation process in events such as explosions, impacts, and high-speed flights, and is especially suitable for short separation processes (such as milliseconds, microseconds, etc.), and It is required that the timing measurement accuracy is high (such as microsecond level or even nanosecond level), and the measurement data needs telemetry wireless transmission.

Description of drawings

Fig. 1 is the flowchart of the method for accurately measuring object separation timing of the present invention;

Figure 2 is a schematic diagram of the separation of the shell and the body of Embodiment 1;

FIG. 3 is a schematic structural diagram of a metal wire plus a single-channel micro-pin of the monitoring node in Embodiment 1. FIG.

In the figure, 1. shell; 2. body; 3. monitoring node;

301. Single pin; 302. Hole position; 303. Metal wire.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. In order to make the design method of the present invention more clear, an embodiment of the present invention is proposed here, and the described embodiment is a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

As shown in Figure 1, taking the separation event of a certain object’s shell and body during flight as an example, the method for accurately measuring the timing sequence of object separation of the present invention is used to achieve high-precision measurement of the timing sequence of the separation process, as follows:

S10. Clearly separate the number of timing measurement channels

As shown in Fig. 2, the casing 1 is set on the body 2, and 200 monitoring nodes 3 are arranged along the separation line, each monitoring node 3 is connected to a measurement channel, a total of 200 measurement channels are connected, and the number of measurement channels M=200.

S20. Specify the channel measurement operation mode

Due to the need to withstand a high temperature of 200°C during the separation process of the casing 1 and the body 2, considering that the operation mode of the measurement channel affects the separation process of the casing 1 and the body 2 as little as possible, the electrical signal measurement operation mode of wire transmission is selected.

As shown in FIG. 3 , each monitoring node 3 is configured as a metal wire plus a single-channel miniature pin. Corresponding holes 302 are set on both sides of the separation line, and a metal wire 303 is fixed on each hole 302. The two metal wires 303 are connected by a single pin 301. When the monitoring node 3 is separated, the single pin 301 disengagement, causing the electrical signal transmitted by the measurement channel of the monitoring node 3 to be interrupted.

S30. Determine measurement channel time recording accuracy

It is estimated that the duration of the separation process of the shell 1 set and the body 2 is about 1ms, that is, the recording time is about 1ms, and the time measurement accuracy ΔT of the separation sequence is required to be 100Ms, so the channel measurement time recording accuracy is also 100Ms.

S40. Design data collection and coding methods

The number of measurement channels for this separation event is 200, and the electrical signal measurement operation mode of metal wire transmission is adopted. The time recording accuracy of the measurement channel is 100Ms, and 200 measurement channels are monitored in real time by using high-speed digital signal processing methods (such as DSP, FPGA, etc.). Once the electrical signal is found to be interrupted (such as changing from 5V to 0V), use 14bit to record the time of electrical signal interruption, and use 8bit to record the channel number corresponding to the electrical signal interruption.

S50. Carry out separation test and record test data

In the end, the recording time of this separation event was about 1.6ms, and the amount of data generated was less than 1Mb.

Claims (2)

1. A method for accurately measuring object separation timing, characterized in that, comprising the following steps: S10. Clearly separate the number of timing measurement channels; According to the application requirements, determine the monitoring nodes that need to measure the time series during the separation process of the object to be measured, arrange a measurement channel at each monitoring node, and specify the number of all channels required for separation time series measurement, that is, the number of measurement channels M; S20. Specify the channel measurement operation mode; According to the characteristics of the separation environment of the object to be measured or the measurement requirements, specify the measurement signal interruption mode of each channel; S30. Determine the time recording accuracy of the measurement channel; According to the measurement requirements, clarify the time measurement accuracy of the object separation sequence, and then determine the measurement time record accuracy of each channel; S40. Designing a data acquisition and encoding method; According to the number of measurement channels M, measurement operation mode and measurement channel time recording accuracy ΔT, the acquisition and encoding method of measurement channel interruption data is designed. The specific steps are as follows: S41. Identify the change of the electrical signal corresponding to each channel, and specify the interruption time of the electrical signal corresponding to each channel; S42. encoding and recording the signal interruption time of each channel and the corresponding channel number; The code length L1 of the interrupt time is determined by the measurement channel time recording accuracy ΔT and the timing length T, L1=int[log ₂ (T/ΔT)]+1, the code length L2 of the channel number is determined by the number of measurement channels M, L2=int [log ₂ M]+1; S50. Carry out a separation test and record the test data. 2. The method for accurately measuring the timing of object separation according to claim 1, characterized in that, the measurement signal interruption mode of the step S20 includes the optical signal measurement operation mode of optical fiber transmission, or the electrical signal measurement operation mode of metal wire transmission Mode; in the range of -40°C to 150°C, select the optical signal measurement operation mode of optical fiber transmission, first convert the optical signal into an electrical signal through a photoelectric conversion circuit, and then judge whether the measurement signal is interrupted; above 150°C, select a high melting point A metal wire with excellent electrical conductivity at ambient temperature is used as a measurement method for electrical signal transmission.

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