SU573857A1 - Signal shaping device - Google Patents

Description

I

The invention relates to a waveform device used in impulse radionavigation systems.

Devices are known for generating a signal with a predetermined moment of transition of an envelope through the zero level, comprising an adder, an attenuator and a conversion circuit consisting of a 1-sverter and a tunable differentiating circuit 1,

The disadvantage of TaiKHX devices is the large magnitude of the measurement error of the temporal position of the pulse.

The closest to the invention in terms of technical complexity is a signal shaping device used in the advanced measuring paths of pulsed radio navigation systems and containing an adder one of the inputs of which is connected to the input of the device directly, and the other through an inverter connected in series, a bandpass filter, an attenuator and a control source voltage 2.

When forming a characteristic point close to the beginning of the input signal, i.e. on sites with low steepness, output sig

This device also has a low slope at the point of formation, which leads to an increase in measurement error.

The purpose of the invention is to increase the steepness of the generated signal.

This goal is achieved due to the fact that the signal forming device containing an adder, one input of which is connected to the input bus of the device, and the other through an optically connected inverter, has a band-pass filter, the control input of which is connected to the control voltage source, and an attenuator according to the invention, between a bandpass filter and an attenuator, a tunable non-minimum phase circuit with a uniform amplitude-frequency characteristic that controls the input is turned on. which is connected to a source of control voltage.

In addition, a non-minimally tunable phase circuit is executed in an N-th order of a phase link.

Claims (2)

FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. Figures 2 and 3 are diagrams of voltages explaining the operation of the device. A signal-shaping device lives an adder 1, one input of which is connected to the input bus 2 of the device directly, and the other through a conversion circuit containing an inverter connected in series; 3, bandpass filter 4, tunable non-minimum phase | circuit 5, attenuator 6, control voltage source 7. In FIGS. 2 and 3 the following is indicated: 8 is the input signal envelope; 9 is the signal envelope at the output of the bandpass filter 4; 10- formed signal; And - the characteristic point of the envelope; 11- output signal tunable. minimal phase circuit 5; 12 - signal at the point of formation; B - characteristic point of the envelope in the presence of a phase circuit 5. The device operates as follows. The input is a mixture of signals and noise. In the conversion circuit, the signal 8 is inverted and converted into a band-pass filter 4, limiting the input noise level to signal 9. Next, signal 9 arrives at a non-minimum phase shop 5. As is well known, non-minimum phase circuits do not have an unambiguous relationship between amplitude-frequency and the phase-frequency characteristic, which is present in minimum phase circuits such as a band-pass filter 4. Signal 9, passed through phase circuit 5, is converted into signal 11 (Fig. 3), delayed relative to signal 9. At attenuator 6, signal 11 is attenuated in right number p It determines the temporal position of the characteristic point B. Due to the delay of the signal 9 obtained in the non-minimum phase circuit 5, the output of the proposed device receives much more signal energy (shaded in Fig. 3) than in the well-known device (on Fig. 2 is also hatched) and, therefore, the steepness of the signal 12 at the point of formation B increases. the use of a wideband discrete multielement delay line is unacceptable here. Since non-minimum phase. the circuit can be easily assembled from a small number of elements, then, smoothly rearranging it over the frequency range S1 with the band-pass filter J, you can re-arrange the circuit for any variation of the input signal phases by connecting the control inputs of the band-pass filter 4 and the non-minimum phase circuit 5 to the control source 7. This non-minimum phase-phase circuit allows you to create a filter that has a fairly uniform amplitude-frequency characteristic in the signal spectrum band, while the phase response can be similar ;; l have one purpose or another steepness. Such a circuit will create an effective delay in the frequency spectrum of the signal without significantly distorting its envelope. The synchronism is ensured by the fact that all circuits in the transformation channel are selected with the same characteristic impedance. The use of a tunable non-minimum phase circuit in the conversion channel favorably distinguishes the described signal shaping device from the known ones, since, for example, when using a second-order phase link that implements-1 signal support in the order of 20 microseconds, the output signal's slope at the point the formation is increased by 2 times. At the same time, the noise in the conversion channel is limited due to the presence of a band-pass filter. The use of the device of the described construction in the receiving and measuring path of the pulse navigation systems makes it possible to reduce the measurement errors of the temporal position of the pulses. Claim 1. Signal conditioning device, co. holding adder, one input of which is connected to the input bus of the device directly, and the other through serially connected inverter, band-pass filter, the control input of which is connected to the source of control voltage, and an attenuator, characterized in that, V: to increase the slope of the formed of the signal, between the bandpass attenuator filter, a tunable phase circuit with a uniform amplitude-frequency characteristic, whose control input is connected to a control voltage source, is switched on. 2. The device according to claim 1, stating that the tunable phase circuit is made in the form of a phase link of the N-th order. Sources of information taken into account in the examination: 1. Author's certificate of the USSR No. 311392, cl. H 03 K 3/80, 1970. 2. USSR Author's Certificate NO 414945, class, N OZ K 3/80, 1971.