SU544158A2 - Device for automatic binding to radio signals of exact time - Google Patents

Description

one

The invention relates to radio systems of a single time and navigation and can be used for automatic assignment of a scale of a single time of a receiving point on the radio signals of transmitting stations of these systems.

According to the main author. swith No. 508772, a device for automatic reference to precise time radio signals is known, comprising a time keeper connected to a reference generator, a phase corrector, a secondary signal processing unit, a readout unit and a command unit associated with a switching unit and a phase corrector, a radio receiver, narrowband ( UE) and broadband (SHP) - whose outputs through the switching unit are connected to the phase corrector, the primary signal processing unit, consisting of a signal gate generator, connected to the wideband output the radio receiver, the driver of the reference gates connected to the phase corrector, and the coincidence circuit, the inputs of which are connected to the outputs of the drivers of the signal and reference gates, and the output through the unit

secondary signal processing is connected to the reading unit l.

The disadvantage of this device lies in the uneven distribution of the analysis time of the received signal in the presence of strong noise. This leads to an increase in the search time for the lowest frequency signals of time, especially with increasing demands on the reliability of binding for a weak signal.

The purpose of the invention is to reduce the binding time.

To achieve this goal, a signal selector and a threshold unit are entered into the device for automatic binding to radio signals of exact time, while the narrow-band output of the radio receiver is connected to the primary signal processing unit through the series-connected threshold unit and the selector, to the other input of which the broadband radio receiver output to the control input is the output of the command block.

The device contains a radio receiver 1, which its outputs (UE) and (SHP) is connected through the switching unit 2 to the phase corrector 3, and through the signal selector 4 to the driver 5 signal gates of the primary signal processing unit 6, and the signal selector 4 is connected to the SNR output -generally, and to the UE output through the threshold unit 7. The output of the driver 5 of the signal gates is connected to the coincidence circuit 8, the second input of which is connected to the driver 9 of the reference gates connected to the 3-phase corrector, and the output through the secondary processing unit 1O Signal 11 is coupled to blokOlM reference. The time keeper 12 connected to the reference generator 13. is connected to a phase corrector 3, a secondary signal processing unit 10, a reference unit 11 and a command unit 14 which is connected to the switching unit 2, a phase corrector 3, a signal selector 4 and the output of the unit 10 secondary signal processing. The device works as follows: When allocating low-frequency time stamps (10, 1, 1 / 1O, 1/60 Gu) and eliminating ambiguity from 10 Hz to 1/60 Hz by the exact time signals of the VLF radio station; 1 in the block 10 of the secondary signal processing implements a sequential search for US-1. 1O, 1, 1 / 1O, 1 / 6O Hz with a known phase. A search for a 10 Hz signal occurs in the radio-broadcaster channel of the radio receiver, since the UE channel does not transmit the lateral components of the spectrum to the amplitude of the single-modulated (AM) signal of 10 Hz. At this stage, a command from the command unit 14 passes through the signal selector 4 to the signal strobe driver a signal from the radio frequency output of radio receiver 1. The phase of the high-frequency signal is monitored by a phase corrector 3, to which the radio receiver 1 is connected via switching unit 2. In the 3 phase corrector, a phase correction is introduced into the reference voltage channel, from which in the preprocessing unit 6 prepares phase correction by an amount equal to the phase difference between the signal and the channels of the radio receiver 1. After working out the initial mismatch, the phase of the reference gates at the output of the imaging unit 9 supporting coffins corresponds to the phase of the signal at the output side of the radio receiver channel 1. Impulses from the coincidence of the signal and supporting strings from the output of the matching circuit 8 enter the secondary signal processing unit 10, where The position of the front of the radio pulse is 1 Hz. At the end of the search 10 Hz unit 10 secondary processing

Claims (1)

outputs a signal to the command unit 14, which switches the signal selector 4 and the 3 phase corrector to the next operation modes: search 1, 1/10, 1/60 Hz. As a result, the UE output of the radio receiver 1 is connected to the driver 5 of the signal gates through the threshold unit 7 and the signal selector 4. The threshold unit 7 transmits only a signal that exceeds the signal level of 10 Hz, i.e. At the input of the driver 5 signal gates 1, 1/10 and 1/60 Hz signals will pass through the selector 4. Since the threshold unit 7 introduces a phase shift of the high-frequency signal filling, the control signal of the command unit 14 introduces the magnitude of this shift (previously measured) in the phase 3 equalizer to the channel of the reference signal, instead of the previously recorded phase shift between the UE and NR channels of the radio receiver 1. Transition to work with a control signal is equivalent to improving the signal-to-noise ratio in vTiT, where u is the ratio of the working bands of the radio receiver. Such a change in the measurement conditions in favor of the signal allows shortening the time for binding on low-frequency signals by no less than two times (for p 25) while maintaining the probability of eliminating ambiguity of accurate measurements of 0.98 when the signal: sound: O ratio is more than 1 in 1 kHz band. With full use of the transmission time of the low-frequency time-tag labels, the gain obtained makes it possible to increase the probability of correct detection of time signals or, at the same probability, reduce the maximum signal-to-noise ratio. The invention of the device for automatic binding to: radio signals of the exact time by author. Bid No. 5О8772, characterized in that, in order to reduce the tie-in time, a signal selector and a threshold unit are introduced into it, while the narrow-band output of the radio receiver is connected to the primary signal processing unit through a series-connected threshold unit and a selector, to the other input of which the broadband output is connected the radio receiver, and to the control input - the output of the command block. Sources of information taken into account in the examination: 1. USSR author's certificate 5O8772, M.Cl Q O4 C 1102 from 1O.04.74 (prototype).