JP2922997B2 - Aircraft measurement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to coded modulation (hereinafter referred to as PCM; Pulse Code M).
The present invention relates to an aircraft measurement device that outputs odulated measurement data.

[Conventional technology]

Data measured during a test flight of an aircraft or the like may require confidentiality.

As shown in FIG. 2, the conventional aircraft measuring device used for the test flight or the like has a signal input terminal 8 for inputting measurement data.
And a measuring instrument 11 provided with a signal output terminal 9 for transmitting the measurement data to the outside. A read-only memory (hereinafter referred to as ROM) (not shown) is provided therein, and a synchronization word is stored therein. Was.

In the above, the PCM signal of each measurement data transmitted from the signal output terminal 6 is provided with the synchronization word, the bit arrangement of the synchronization word is kept secret, and the measurement data is kept secret.

[Problems to be solved by the invention]

In the conventional device, the bit arrangement of the synchronization word in the PCM signal was concealed to prevent the secret leakage of the measurement data.However, since the bit arrangement was fixed, the combination was determined by the existing reproducing apparatus. There is a risk that the contents may be easily grasped by changing the reproduction.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a device that can prevent secret leakage and that can use an existing playback device.

[Means for solving the problem]

The present invention forms a predetermined channel arrangement by sequentially arranging a plurality of frames which are channels for transmission of respective measurement data measured at a plurality of measurement points after a synchronization word, and forming a predetermined channel arrangement at a predetermined measurement point. PCM for measured data
PC that converts to signals and allocates them to predetermined frames for transmission
In aircraft measurement equipment using the M transmission method, a ROM (hereinafter referred to as EPROM)
A plug having an Electrically Programmable ROM), a wire connected to one end of the plug, and a computer connected to the other end of the wire and rewriting the channel arrangement of the measurement data stored in the EPROM. It is characterized by:

[Action]

In the above, every time a test flight of an aircraft is conducted, a computer is connected to the plug of the measuring instrument via electric wires before the test flight, and the EPROM is used by the computer.
Is rewritten in the channel array of the measurement data stored in the. The test flight is performed, and the measurement data obtained thereby is arranged and transmitted according to the rewritten channel arrangement, so that it is not decoded by a third party.

As described above, the channel array of the measurement data is rewritten every test flight, so the measurement data can be reproduced by the existing reproduction device without the need for a complicated reproduction device, and advanced measurement data can be concealed. It became.

〔Example〕

 One embodiment of the present invention is shown in FIG.

The embodiment shown in FIG. 1 is a plug 2 having an EPROM built therein and arranged on a front operation panel 10 of a measuring instrument 1 provided with a signal input terminal 8 and a signal output terminal 9.
Is provided with a general-purpose personal computer 5 to which an electric wire 6 connected to one end and an interface box 4 provided with a plug 3 to which the other end of the electric wire 6 is connected are connected by electric wires.

In the above, when a test flight of an aircraft is performed, the plug 2 of the measuring instrument 1 and the plug 3 of the interface box 4 are connected by the electric wire 6 before the start of the test flight, and the EPROM is used by the general-purpose personal computer 5. Is rewritten in the channel array of the measurement data stored in the.

In this embodiment, the transmission method of the measurement data is PCM.
Because of the transmission method, the measurement data measured at each measurement point is converted into a PCM signal, allocated to a plurality of frames formed sequentially after the synchronization word, and transmitted. When the transmission completes, the measurement data newly measured at each measurement point is allocated to each frame and transmitted in the same manner as described above, and this is repeated.

Here, the measurement data measured at a predetermined measurement point is always allocated to a predetermined frame, and each frame is a channel of the measurement data. A state in which the respective frames are arranged in a predetermined order is a channel arrangement.

In the transmission of the measurement data obtained by performing the test flight, the measurement data is arranged in accordance with the newly rewritten channel arrangement, so that the measurement data is not decoded by a third party.

As described above, since the channel array of the measurement data is rewritten every time a test flight is performed, the measurement data can be reproduced by an existing reproduction device without the need for a complicated reproduction device. It has become possible.

〔The invention's effect〕

The aircraft measurement device of the present invention has a measuring instrument provided with a plug having a built-in EPROM, and the channel arrangement of the measurement data stored in the EPROM can be rewritten by a computer. Since the measurement data is rewritten every time, the measurement data can be reproduced by the existing reproduction device without the need for a complicated reproduction device, and advanced measurement data can be concealed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional apparatus. 1… Measuring instrument, 2,3… Plug, 4… Interface box, 5… General-purpose PC, 6… Wire, 8… Signal input terminal, 9… Signal output terminal, 10… Front operation panel .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B64D 43/00 B64D 47/00 H04L 9/00 621

Claims (1)

(57) [Claims] 1. A predetermined channel arrangement is formed by sequentially arranging a plurality of frames, which are channels for transmitting respective measurement data measured at a plurality of measurement points, after a synchronization word to form a predetermined channel arrangement. In an aircraft measurement device using a coded modulation transmission system for converting the measurement data measured in the above into a coded modulation signal, allocating the coded modulation signal to a predetermined frame and transmitting the coded modulation signal, a memory provided in a measuring instrument and capable of writing and erasing therein An aircraft comprising: a plug having: a plug; an electric wire connected to one end of the plug; and a computer connected to the other end of the electric wire, for rewriting a channel arrangement of measurement data stored in the memory. Measuring device.