SU873175A2 - Device for doppler speed meter signal processing - Google Patents

Description

one

I

SUBSTANCE: invention relates to signaling, can be used for signal processing by a Doppler speed meter in aero- flow. systems.

.By main auth. No. 697940, a device for processing signals of a Doppler velocity meter, comprising N channels, each of which contains a serially connected bandpass filter and a key, is known, while the inputs of the bandpass filters and the key outputs of all channels are interconnected and are respectively the input and output of the device, and the second output of the band-pass filter of each of the channels is connected to the input of the gate driver, ajfieyNI-HE, (M + 1) AND-NO and a controlled inverter, and c. each of the channels of a two-element 2I-NOT, an element SH-HJS, an inverter and a blocking key, the output of the gate generator of each channel through the element 5I-NOT connected to the second input of the key, the first inputs of the elements 2 AND-NOT of its channel and with the second and the third input elements 5И-NOT, respectively, of the previous and subsequent channels and with the inputs of the element NONE, the second

the inputs of the 2I-NOT elements of each ka-. lines are interconnected and connected respectively to the outputs of the element (M + 1) AND-NOT and the element NE-NO, the outputs of elements 2И-NOT of each of the channels are connected respectively to the fourth and fifth inputs of the element 5И-NOT of their channel, the second output the bandpass filter of each channel is connected to the first input of the blocking key, the second input of which is connected to the output of the second element 2I-NOT of its channel, the output of the gate generator of each channel through the inverter 15 is connected to the corresponding input of the element (M + 1) AND NOT, the output of the element MI-NOT through the controlled inverter is connected to the corresponding input of the element (M + 1) AND-NOT, the outputs of the blocking

The 20 keys are interconnected and connected to the device body, and the forMHpoBaTejjb gates are designed as a series-connected amplitude selector and detecting cascade, and the input of the amplitude selector is the input of the gate forming device, and the output of the cascade detecting output 1. . .

However, this device has 30 insufficient performance.

The purpose of the invention is to increase speed.

For this, a serially connected input strobe pulse shaper and an additional inverter, the output of which is connected to (N + 1), are introduced into the device for processing the signals of the Doppler velocity meter. the input of the iNH-HE element, and the input of the input strobe pulse generator is connected to the common input of the device, and the input strobe pulse driver is designed as a series-connected square pulse generator, first detecting cascade, inverter and element 2I-HE, the output of which is connected to subtractive input reversible counter, to the summing input of which is connected to the output of the second element 2I-NOT, the first input of which is connected to the output of the first detecting cascade and the first input of the third element 2I-NOT: and second The second input of the 2I-N element is connected to the output of the reference frequency generator and the second input of the first 2I-NO element, the first input is connected to the second input of the third 2I-NOT element, the output of which is connected to the reset input of the reversible counter, the outputs of which are connected with the corresponding inputs of the coincidence element, the output of which is connected to the input of the second detector stage of the cascade, the output of which is the output of the input strobe pulse generator, the input of which is the input of the direct drive coal impulses.

.In FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 shows an embodiment of an input strobe pulse former; in fig. 3 and 4 are timing diagrams for the operation of the device.

The device (Fig. 1) contains bandpass filters, keys 2, drivers of gates 3, element NH-HE 4 element (N + 1) H-HE 5, controlled inverter 6, blocking keys 7, driver 3 contains an amplitude selector 8 and detecting cascade 9, elements 2I-NOT 10, elements 5I-NOT 11, elements 2I-NOT 12, inverters 13, shaper 14 of the input strobe pulse and an additional inverter 15.

The input strobe pulse generator (Fig. 2) contains a 16 square pulse shaper, a first detection stage 17, an inverter 18, a first element 2IL-19, a reversible counter 20, a coincidence element 21, a frequency generator 22, a second element 2I-NOT 23, a second detection stage cascade 24, a delay element 25, and a third element 2I — NO 26.

The device works as follows.

With the arrival of the input Doppler frequency signal (Fig. 3a), strobe pulses exceeded the threshold level at the output of the corresponding channel inverters 13, caused by the action of the useful component (Fig. 3 b, c) and low-frequency response (Fig. 3.). .

During the strobe pulse from the useful component, which arrives at the controlled inverter b (fig. 3 t), the signal from the corresponding band-pass filter 1 passes at the output of the device (fig. 3k). At the same time, all other bandpass filters are blocked by the keys 7 (Fig. 3 ct}.). The total duration of the blocking time (Fig. 3 and) is defined as acting as a strobe pulse generated from the useful component (acting at the input of the MI-NE 4 (fig.Zh) and a strobe pulse generated at the output of the shaper 14 of the input strobe pulse generated at the output of the shaper 14 of the input strobe pulse (fig.Z g) and fed through the inverter 15 to the (N + iy input element MI-NOT 4 (fig.Za

Thus, the blocking filters 1 (Fig. 3 and) are blocked in the presence of strobe pulses, caused by the action of the useful component (Fig. 3 b) and the strobe pulse, generated from the Doppler frequency input signal (Fig. For ,, t ,. Regardless of the passage of the useful component to the output of the device, the relatively low duration of the low-frequency responses, which determines the duration of the closed state of the device supported by the logical unit at the output of the element (N + 1) AND-HE 5, is relatively short (fig.j)

Thus, the probability of the occurrence of the next radio pulse at the device input at the time of the presence of the specified logical unit at the output of the element (M + 1) AND-HE 5, i.e. when using an input strobe pulse, the possible omission of input signals is reduced, and consequently, the goal is achieved - the device speed increases.

The formation of the input strobe pulse occurs as follows: the Doppler frequency input signal (Fig. 4a) is fed to the input stator 14 of the input strobe pulse, whose input is the input of the former 16, at the output of which a pack of rectangular pulses is formed (Figure 4-5 ), then passing through the detection circuit Cascade 17 (Fig. 4 t Detecting constant selected

so that at high frequencies f an (fig. 4 q) to form a video pulse from a pack of rectangular pulses. At the lower frequencies fa (fig. 4 s), the packet is not. detected. Such a constant detection is chosen in order not to increase the duration of the video pulse. To form a video pulse in the entire frequency range, a pack of rectangular pulses is filled with a sequence of standard pulses from the output of the reference frequency generator 22, the follow-up period of which (Fig. 4d-) corresponds to a constant detection of the detection stage 17. During the duration of the rectangular pulse, the standard sequence ( Fig. 4) through the element 2I-NB 23, controlled by the logical unit from the output of the detecting stage 17, is fed to the summing input of the reversing counter 20, and during a pause Through element 2I-NOT 19 controlled by the logical unit from inverter 18 (corresponding to the pause from the output of the detecting stage 17) to the readout input of the reversible counter 20, which is designed so that the pulse sequence coming to the subtracting input is perceived only when the reverse counter 20 recorded a number other than zero. Since the duration of the central pulse of a rectangular sequence can be. more than the period of the Doppler frequency (figure 4 a, 5, b), reversible counter

20 is reset on the leading edge of each sequence pulse. A reset signal (Fig. 4e) is formed

at the output of the element 2I-NOT 26, the first input of which receives a signal from the output of the detecting cascade 17. (FIG. 4 b), and the second input is the same signal inverted by the inverter 18 and delayed by the delay element 25 (fg.4E).

In the reversible counter 20, during the operation of the radio pulse, there is a certain number (Fig. 4), other than zero, except for the arrival times of the discharge pulses, the duration of which does not exceed the delay time of the delayed delay element 25. During the time when the number in the reversible counter 20 is excellent from zero, at the output of the element

The coincidence, the rods of which are connected to the outputs of the reversing one from the wire 20, forms a logical unit (Fig. 4a). The output signal from element 21 of the padeia is posed to the second detecting stage 24, the constant detection of which is selected in accordance with the delay time of element 25 of delay. At the output of the second detection stage 24, a video pulse is generated (Fig. 4 and), which is the output of the HiM signal from the input gateway driver 14. Thus, throughout the whole range, a strobe pulse is formed corresponding to the duration of the input radio pulse, the use of which, when blocking bandpass filters, allows to achieve the goal of the proposed invention to increase speed.

five

Claims (2)

1. Device for processing signals of a Doppler velocity meter according to auth.St. In 697940, it is distinguished by the fact that, in order to increase speed, the input strobe pulse shaper and the additional EFI inverter are connected, the output of which is connected to the (N + 1) input of the MI-HE element, and the input shaper of the input gate. impulse connected with a common input device .. 2. The device according to Claim 1, which is based on the fact that the driver of the input strobe pulse is made in the form of a series-connected driver — rectangular pulses, the first detecting stage, the inverter, and element 2I — HE, 5 the output of which is connected to the subtractive input of the reversible counter, to the summing input of which the output of the second element 2I-NOT is connected, the first input of which is connected to the output 0 by the course of the first detecting unit and the first input of the third element 2I-NOT, and the second input of the second element 2I-NOT connected to the output of the reference frequency geieratra and the second input of the first element 2I-NOT, the first Input 5 which, via a delay element, is connected to the second input of the third element 2I-NOT, the output of which is connected to the resetting input of the reverse counter, the outputs of which are connected to the corresponding inputs of the coincidence element, the output of which is connected to the input of the second detection stage, the output of which is output BxcSjj5 strobe pulse, whose input is the input of the rectangular pulse former. Sources of information taken into account in the examination 0 1. USSR author's certificate 697940, cl. G 01 S 9/44, 1978 (prototype). / fff / 7 Yr 9% / "2  1 ii u1 99 T