A hybrid framing method for the measurement parameters of the ballistic recorder

Abstract

The invention discloses a measurement parameter hybrid framing method of a missile-borne recorder. According to the method, measurement parameters are received by use of an FPGA chip, wherein digital measurement parameters directly go into the FPGA chip through a serial port for storage in FIFO2; and analog measurement parameters go into the FPGA chip through a multiplexer and an A / D converter which are sequentially connected and are finally written into an externally connected FLASH memory through the FPGA. The analog measurement parameters are acquired by use of an A / D converter with n channels, after fully packed data packets are obtained through acquisition, the data packets are sent to the FPGA; the FPGA, according to an acquisition frequency, extracts data from the fully packed data packets and carries out framing, and data after the framing is stored in FIFO1; and then, in a GPIO interruption service program, the data of the FIFO1 and the FIFO2 are respectively written into different pages of the externally connected FLASH memory. The method provided by the invention simplifies the frame format, improves the effective signal transmission bandwidth, reduces the complexity of a multipath switch control algorithm and data processing software, and has certain flexibility.

Description

technical field [0001] The invention relates to the technical field of missile flight parameter measurement, in particular to a mixed frame method for measurement parameters of a missile-borne recorder. Background technique [0002] The ballistic recorder is used to collect and store various parameters during the flight of tactical missiles. [0003] As an effective means of low-cost telemetry, the ballistic recorder mainly uses data acquisition and storage technology. FPGA devices are usually used to complete the switching of multi-channel switches, A / D conversion, data acquisition, mixed framing of measurement parameters, and formation of data streams; single-chip or DSP is used as the main control chip to control the FLASH memory to realize the storage and storage of cached data streams. read. [0004] At present, in terms of engineering design, when the ballistic recorder collects variable-rate measurement parameter frames, it is generally necessary to create a channel...

AI Technical Summary

Problems solved by technology

[0006] (1) The channel table is complex

When there are too many channels, the process of writing the channel table is complicated, and when the measured parameters change, the channel table needs to be redesigned;

[0007] (2) There are too many "service bytes", each full frame is made up of a variety of measured parameter information bytes, and contains a large number of "service bytes" such as sub-frame IDs, padding bytes, and frame tails, which not only improves The code rate of acquisition and storage is reduced, and the effective signal transmission bandwidth is reduced;

[0008] (3) Increased system complexity

The algorithm is complex when controlling multi-way switch switching according to the channel table, and the hardware circuit of the multi-way switch part is complex

[0009] (4) Increased the complexity of ground data processing software

After recovering the measured parameters stored in the memory, unpack them according to the channel table, the process of restoring the corresponding measured parameters is complicated

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