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In order to more intuitively observe the important actions and key information such as one or two stages separation of a carrier rocket, two stage engine condition, the separation of the fairing, the separation of the star and the key of the rocket, we can better master the product performance and improve the product reliability during the flight of the rocket, and give a design of the image measurement system based on the RS error correcting code. RS code can effectively correct burst errors and random errors in channel transmission, improve signal gain and improve RF signal communication quality. In this paper, the algorithm of RS error correcting code algorithm is described. According to the existing telemetry channel capacity, a 16 byte error correcting code is designed, and the RS code (184,168) is constructed by removing 12 byte sub frame synchronization code and sub frame count. The principle architecture of the scheme is given. The principle of the hardware design of the camera and the image compression encoder, the architecture and flow chart of the embedded software design are introduced in detail. The flight test results show that the image measurement system coded by RS can effectively solve the mosaic, flower screen and carton phenomenon of the image, and the whole course picture is clear and fluent.