Design And Research On Key Technology Of Data Recording Device

The data recording device is used to test multiple environmental parameters, motionparameters, command signals and change situation of resistance between the specified nodeduring the flight test of aircraft. In particular, it performs the operation of data collection,coding and storage, and is used to analyze data after reclaim.The data recording device consists of two data recorders. This paper derivatives fourkey techniques on the basis of introduction of overall function. Among them, reliable starttechnology, design of logic control of data recorder 1, communication mode between the twodata recorders is the more important. Reliable start scheme is the optimized design which ison the basis of original design, to ensure that data recorder can start and complete the test ofall the parameters in the normal and accidental circumstances. For design of logic control ofdata recorder 1, two FIFOs are designed in data recorder 1, realizes that data of two datarecorder 2 can all saved in memory of data recorder 1 which is coordinated with strict logicrelations. For communication mode between the two data recorders, this paper adopts 422serial communication mode. Transmission of content between two data recorders is commandand data. Using checksum guarantees that command isn’t change in the process oftransmission, and design for FIFO at transceiver ensures that data will not overflow. At thesame time, only the read operation can execute for alternate reading interface in order toprevent test data from writing and erasing again.In addition, introduce measuring method and principle of some of the key analog signal,such as temperature, resistance and switch quantity. Temperature measurement error based onthermocouple is analyzed, and then list the method to reduce the measurement error. Isolationtechnology is applied to resistance and switch quantity measurement, so as to reduce noise.The data recording device has been successfully applied to a flight test of aircraft, itproves that rationality of the design of FIFO in data recorder 1 and reliability of serialcommunication interface.