RU1309742C - Device for forming indication response signal - Google Patents

Abstract

FIELD: radio navigation. SUBSTANCE: device has aerial 1, input unit 2, airborne receiver 3, indication interrogation signal decoder 4, unit 5 for selecting indication response signal, indication response signal coder 6, airborne transmitter 7, "North" signal decoder 8, code-to-time interval converter 9 and OR gate 10. EFFECT: improved reliability of forming of response signal. 2 dwg

Description

 The invention relates to radio navigation and can be used in the on-board equipment of radio systems of near navigation.

 The purpose of the invention is to increase the reliability of the formation of the response signal by eliminating the possibility of the disappearance of the signal response indication when the azimuth signal disappears at the input of the device.

 In FIG. 1 shows a structural electrical diagram of the proposed device; in FIG. 2 - diagrams explaining his work.

 The device comprises an antenna 1, an input unit 2, an on-board receiver 3, an indication request signal decoder 4, an indication response signal extraction unit 5, an indication response signal encoder 6, an on-board transmitter 7, a North signal decoder 8, a code 9 converter — a time interval, and element OR 10.

 The device operates as follows.

 The indication request signals received by the on-board receiver 3 through the antenna 1 and the input unit 2 are generated in the display request signal decoder 4 and fed to the display response signal extraction unit 5 (Fig. 2a), where the azimuthal pulse generated by the OR 10 element from the radio ( receiver 3, Fig. 2b) and autonomous (code-time interval converter, Fig. 2c) means.

 At the moment of coincidence of the indication request signals with the azimuthal pulse, an indication response signal is generated at the output of block 5 (Fig. 2d), which, through the encoder 6, starts the transmitter 7 and is broadcast through the input block 2 and antenna 1.

 In the absence or distortion of the input azimuthal signal under adverse reception conditions, the azimuthal pulse at the output of the on-board receiver 3 disappears (Fig. 2b), however, the proposed device continues to generate an indication response when there is a request, receiving information about the azimuth through the converter 9 code - time interval (Fig. 2c) from autonomous funds.

 As a synchronizing start pulse, which serves as a signal to the beginning of the conversion, the North signal is used (matches 35 and 36 pulses), allocated by the North decoder 8 (Fig. 2e) from the set of signals received by the on-board receiver 3.

 One of the variants of the code converter - the time interval contains a highly stable generator, trigger, coincidence block, counter.

 An azimuth code from autonomous means is entered into the counter, which is additional to the source code. The synchronization of autonomous means with the beacon signals is achieved due to the fact that pulses with a period τ after the arrival of the conversion start pulse (the North signal synchronous with respect to the indication request signals) begin to arrive at the counter, marking the beginning of the desired interval. The counter works on addition until a zero code appears on it, after which the high-order bit of the counter generates an overflow pulse (stop pulse), which marks the end of the time interval and stops the pulse counting.

Claims (1)

 DEVICE FORMATION OF AN INDICATION RESPONSE SIGNAL, comprising an antenna, an input unit, an on-board receiver, an indication request signal decoder, an indication response signal extraction unit, an indication response signal encoder and an on-board transmitter, the output of which is connected to the second input input unit, characterized in that, in order to increase the reliability of the formation of the response signal by eliminating the possibility of the disappearance of the signal response indication when the azimuth signal disappears at the input of the device, in o the sequentially connected signal decoder “North” is introduced, the code converter is a time interval and the OR element, the output of which is connected to the second input of the signal response signal extraction unit, and the second input is connected to the output of the azimuthal pulse of the on-board receiver, the input of the signal decoder “North” is connected to the output of the onboard receiver, and the second input of the code converter - the time interval is the input of autonomous navigation data.

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