A method for accurately measuring the separation timing of objects

Abstract

The present invention belongs to the field of aerospace technology, and discloses a method for accurately measuring the separation timing of an object. The method for accurately measuring the separation timing of an object of the present invention comprises clarifying the number of separation timing measurement channels, clarifying the channel measurement operation mode, determining the time recording accuracy of the measurement channel, designing a data acquisition encoding method, conducting a separation test and recording the test data. The method for accurately measuring the separation timing of an object of the present invention uses the interruption information of an optical signal or an electrical signal to characterize the separation characteristics of an object, arranges a multi-channel signal transmission line at a monitoring node at the object separation position, measures the interruption moment of the signal in each channel transmission line, and obtains high-precision timing information of the object separation. The method for accurately measuring the separation timing of an object of the present invention is used for high-precision timing measurement of the object separation process in explosions, impacts, and high-speed flight events, and is particularly suitable for occasions where the separation process is short, the timing measurement accuracy is high, and the measurement data requires telemetry and wireless transmission.

Description

Technical Field

[0001] The invention belongs to the field of aerospace technology, and in particular relates to a method for accurately measuring the separation timing of an object. Background Art

[0002] In the field of aerospace technology, there are often events such as the controlled separation of multiple objects. In such separation events, accurately measuring the separation timing information between objects is of great value for achieving accurate control of parameters such as the aircraft's attitude and orbit.

[0003] In such object separation events, no matter whether explosive separation, mechanical separation or hot melt separation is used, it is difficult to achieve the ideal separation process, that is, the expected ideal separation distance or separation speed cannot be maintained from the start of separation to the end of the separation process. Therefore, by measuring the separation process of related objects and accurately obtaining the separation time series data of the required monitoring nodes in the separation process, it is of great significance to evaluate the separation effect and improve the control accuracy of the flight target motion parameters.

[0004] At present, the main method for measuring the separation between objects is the optical imaging method. This method can intuitively obtain the image data of the separation process, but it is difficult to obtain effective measurement data in situations where the object separation speed is high and wireless data transmission is required, or there is light interference in the separation process. For example, in situations where the object separation speed is high and telemetry wireless data transmission is required, in order to obtain a clear image of the separation process, the frame rate of optical imaging needs to be increased, but the frame rate is difficult to increase indefinitely. In addition, increasing the imaging frame rate will generate a large amount of data that exceeds the capacity limit of the wireless transmission bit rate of telemetry data. For example, when the object separation speed is 100m / s, in order to obtain a clear image of the separation process, the optical imaging uses a frame rate of 1000 frames / second. Assuming that each clear image is 1Mb, the amount of data generated per second is 1000Mb, which far exceeds the current general telemetry wireless data transmission bit rate (such as the S band up to about 20Mbps).

[0005] In response to the measurement requirements of this type of separation problem, the present invention proposes a method for accurately measuring the separation timing of objects by utilizing a multi-channel interrupt signal high transient recognition processing mode. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for accurately measuring the separation time sequence of objects.

[0007] The method for accurately measuring the separation time sequence of an object of the present invention comprises the following steps:

[0008] S10. Specify the number of channels for separation timing measurement;

[0009] According to the application requirements, determine the monitoring nodes that need to measure the timing during the separation process of the object to be measured, arrange a measurement channel at each monitoring node, and clarify the number of all channels required for separation timing measurement, that is, the number of measurement channels M;

[0010] S20. Clarify the channel measurement operation mode;

[0011] According to the separation environment characteristics or measurement requirements of the object to be measured, clarify the measurement signal interruption method of each channel;

[0012] S30. Determine the time recording accuracy of the measurement channel;

[0013] According to the measurement requirements, the time measurement accuracy of the object separation sequence is clarified, and then the measurement time recording accuracy of each channel is determined;

[0014] S40. Design data collection coding method;

[0015] According to the number of measurement channels M, the measurement operation mode and the measurement channel time recording accuracy ΔT, the collection and encoding method of the measurement channel interruption data is designed. The specific steps are as follows:

[0016] S41. Identify the changes in the electrical signals corresponding to each channel and clarify the interruption time of the electrical signals corresponding to each channel;

[0017] S42. Encode and record the signal interruption time of each channel and the corresponding channel number;

[0018] The coding length L1 of the interruption time is determined by the time recording accuracy ΔT of the measurement channel and the timing length T, L1 = int[log 2 (T / ΔT)]+1, the coding length L2 of the channel number is determined by the number of measurement channels M, L2=int[log 2 M]+1;

[0019] S50. Perform a separation test and record the test data.

[0020] Furthermore, the measurement signal interruption mode of step S20 includes an optical signal measurement operation mode of optical fiber transmission, or an electrical signal measurement operation mode of metal wire transmission; within the range of -40°C to 150°C, the optical signal measurement operation mode of optical fiber transmission is selected, the optical signal is first converted into an electrical signal through a photoelectric conversion circuit, and then it is determined whether the measurement signal is interrupted; above 150°C, a metal wire with excellent electrical conductivity characteristics and a melting point higher than the ambient temperature is selected as the electrical signal transmission measurement mode.

[0021] The method for accurately measuring the object separation timing of the present invention uses the interruption information of optical signals or electrical signals to characterize the separation characteristics of the object. By arranging multi-channel signal transmission lines at the required monitoring nodes at the object separation position and measuring the interruption moment of the signal in each channel transmission line, the object separation timing data with a small amount of data and a measurement accuracy of nanoseconds is obtained.

[0022] The method for accurately measuring the separation timing of objects of the present invention is mainly used for high-precision timing measurement of the separation process of objects in events such as explosions and impacts, high-speed flights, etc., and is particularly suitable for situations where the separation process is short (such as milliseconds, microseconds, etc.), and requires high timing measurement accuracy (such as microseconds or even nanoseconds), and the measurement data needs to be telemetered and wirelessly transmitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a method for accurately measuring the separation timing of an object according to the present invention;

[0024] Figure 2 This is a schematic diagram of the separation of the housing and the body of Example 1;

[0025] Figure 3 This is a schematic diagram of the structure of the metal wire plus single-channel micro pin of the monitoring node of Example 1.

[0026] In the figure, 1. Shell; 2. Main body; 3. Monitoring node;

[0027] 301. Single pin; 302. Hole; 303. Metal wire. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. In order to make the design method of the present invention clearer, an embodiment of the present invention is proposed here, and the described embodiment is a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, taking the separation event of the shell and the body of a certain target during flight as an example, the method of accurately measuring the separation sequence of an object of the present invention is used to achieve high-precision measurement of the separation process sequence, as follows:

[0031] S10. Clearly separate the number of timing measurement channels

[0032] like Figure 2As shown, the housing 1 is mounted on the body 2, 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.

[0033] S20. Clarify the channel measurement operation mode

[0034] Since the shell 1 needs to withstand a high temperature of 200°C during the separation process from the body 2, and considering that the operation mode of the measurement channel should affect the separation process of the shell 1 and the body 2 as little as possible, the electrical signal measurement operation mode using metal wire transmission is selected.

[0035] like Figure 3 As shown, each monitoring node 3 is configured as a structure of a metal wire plus a single-channel micro 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 is disengaged, resulting in the interruption of the electrical signal transmitted by the measurement channel of the monitoring node 3.

[0036] S30. Determine the time recording accuracy of the measurement channel

[0037] It is estimated that the duration of the separation process between the shell 1 and the body 2 is about 1 ms, that is, the recording duration is about 1 ms. The time measurement accuracy ΔT of the separation sequence is required to be 100 Ms, and the channel measurement time recording accuracy is also 100 Ms.

[0038] S40. Design data collection coding method

[0039] The number of measurement channels for this separation event is 200. The electrical signal measurement operation mode of metal wire transmission is adopted. The measurement channel time recording accuracy is 100Ms. High-speed digital signal processing methods (such as DSP, FPGA, etc.) are used to monitor the electrical signals of 200 measurement channels in real time. Once the electrical signal is interrupted (such as from 5V to 0V), the time of the electrical signal interruption is recorded using 14 bits, and the channel number of the corresponding electrical signal interruption is recorded using 8 bits.

[0040] S50. Conduct separation test and record test data

[0041] Finally, the recording duration of this separation event was approximately 1.6 ms, and the amount of data generated was less than 1 Mb.

Claims

1. A method for accurately measuring the separation timing of an object, characterized in that: The following steps are involved: S10. Specify the number of channels for separation timing measurement; According to the application requirements, determine the monitoring nodes that need to measure the timing during the separation process of the object to be measured, arrange a measurement channel at each monitoring node, and clarify the number of all channels required for separation timing measurement, that is, the number of measurement channels M; S20. Clarify the channel measurement operation mode; According to the separation environment characteristics or measurement requirements of the object to be measured, clarify the measurement signal interruption method of each channel; S30. Determine the time recording accuracy of the measurement channel; According to the measurement requirements, the time measurement accuracy of the object separation sequence is clarified, and then the measurement time recording accuracy of each channel is determined; S40. Design data collection coding method; According to the number of measurement channels M, the measurement operation mode and the measurement channel time recording accuracy ΔT, the collection and encoding method of the measurement channel interruption data is designed. The specific steps are as follows: S41. Identify the changes in the electrical signals corresponding to each channel and clarify the interruption time of the electrical signals corresponding to each channel; S42. Encode and record the signal interruption time of each channel and the corresponding channel number; The coding length L1 of the interruption time is determined by the time recording accuracy ΔT of the measurement channel and the timing length T, L1 = int[log2(T / ΔT)] + 1, and the coding length L2 of the channel number is determined by the number of measurement channels M, L2 = int[log2M] + 1; S50. Perform a separation test and record the test data.

2. The method for accurately measuring the separation sequence of objects according to claim 1, characterized in that: The measurement signal interruption mode of step S20 includes an optical signal measurement operation mode of optical fiber transmission, or an electrical signal measurement operation mode of metal wire transmission; within the range of -40°C to 150°C, the optical signal measurement operation mode of optical fiber transmission is selected, the optical signal is first converted into an electrical signal through a photoelectric conversion circuit, and then it is determined whether the measurement signal is interrupted; above 150°C, a metal wire with excellent electrical conductivity characteristics and a melting point higher than the ambient temperature is selected as the electrical signal transmission measurement mode.

Images