JPS5926908B2 - Angle signal generator - Google Patents

Description

Detailed Description of the Invention For example, in a direction finder that detects the direction of arrival of radio waves, or a magnetic compass that detects the direction of geomagnetism, any azimuth angle can be detected during a time interval corresponding to 360 degrees of all azimuth angles. requires a circuit that sends out an angle signal at a time corresponding to .

For example, by driving flip-flops with angle signals generated at times when the azimuth corresponds to 90 degrees and 270 degrees, and angle signals generated at times when the azimuth corresponds to 180 degrees and 0 degrees, two By forming two rectangular waves, balanced modulating the outputs of directional antennas arranged orthogonally with the above rectangular waves, combining them, and then detecting them, the direction of arrival of the radio waves can be determined from the phase of the detected outputs. Can be done.

The present invention, as described above, provides a simple device for transmitting angle signals at times corresponding to arbitrary azimuthal angles during a predetermined time interval.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which the output pulse of the clock pulse generator C is applied to the decimal counter N1,
The carry pulse is further added to the IO base counter N2.

Therefore, the full scale of the counters N1 and N2 is 1.00, but the carry pulse drives the four-stage shift register Q, and the signals p p q and r y S are sequentially sent from each stage. That's how it is.

Further, the output signal of the counter N2 is applied to the decoder D, and each time the count value reaches 60, 70.80, and 90, the signals a, b, c, and d are sent out, and the signals p, d, and q are
and c, r, and s and a respectively as Nantes Gate AI
, A2 , A3 .

In addition to A4, flip-flops F1 . Counter Nl is driven by the output of gate A4 while driving F2.

This is to reset N2 and shift register Q.

Further, the signals q and S and r and S are respectively OR-
01.02 plus its output and counters N1, N
The output signal No. 2 is applied to the latch circuit, and this latch circuit is controlled by the signal at the terminal T, and is displayed on the display.

Figure 2 is a time chart showing the operation of the above-mentioned device.
The shift register Q increments every time 100 clock pulses are sent out and sends out the signal p y q p r +S.

Further, the decoder D is a counter Nl. Each time the count value of N2 reaches 60, 70, etc., the signals a,
b..., but when signal S is being sent, signal a.

is sent out, the counter N1 is output from the Nandt gate A4.
, N2 and shift register Q are reset.

Therefore, every time 360 clock pulses are sent out, the counter etc. are reset, and a reference signal corresponding to the angle O is sent out from the terminal U as required.

Also, the Nant gate AI sends out a signal when the signals p and d are applied simultaneously, thus at a time point corresponding to an angle of 90 degrees, and the Nant gate A2 and A3 similarly send out a signal at a time point of an angle of 180 degrees and 270 degrees. Send.

Since the flip-flops Fl, F2 are driven at these times, the flip-flops are shown in FIG.
A rectangular wave as shown in 2, that is, two rectangular waves whose phases differ by 90 degrees from each other, is transmitted.

Note that the OR gate 01.02 has outputs as shown by ol and o2 in Figure 2, and therefore the lO base digits 0, 1, and 2 are displayed at the bottom.
．． A binary code signal corresponding to the numerical value indicated by 3 is sent out.

Since this signal and the output signals of the counters Nl and N2 are added to the latch circuit, if the latch signal is applied to the terminal T at any time, the count value and therefore the angle at that time will appear on the display K.

That is, the above-mentioned rectangular wave f1. For example, by balanced modulating and synthesizing the antenna output of a direction finder at f2 and adding a latch signal to terminal T at a time corresponding to the phase of the demodulated signal, the angle indicating the direction of arrival of the radio wave can be displayed on display K. Displayed as a number in units of 1 degree.

As mentioned above, the present invention uses a decimal counter Nl.

N2 and a four-stage shift register Q, the output signal of the appropriate stage in the shift register and the counter N1
, N2 is applied to the decoder D and is ANDed with the signal obtained when the desired count value is reached, thereby transmitting an angle signal at a time point corresponding to a desired angle expressed in degrees.

Therefore, by detecting, for example, the direction of arrival of radio waves or the direction of geomagnetism using such a signal as a reference, the azimuth angle can be directly displayed in degrees, and the apparatus can be configured extremely simply.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention.
3 is a time chart illustrating the operation of the device shown in the figure. In the figure, L is a latch circuit, K is a display, D is a decoder, AI, A2... are Nant gates, 0
1.02 is an OR gate, Fl and F2 are flip-flops, C is a clock pulse generator, N1 and N2 are 10
The decimal counter, Q, is a shift register.

Claims (1)

[Claims] 1. A counter with a full scale of 100 that counts clock pulses, a 4-stage shift register driven by the carry signal of the counter, and an output signal of the final stage of the shift register and the count value of the counter. a gate circuit that resets the counter and the shift register according to an AND with a signal sent out when the count reaches 60, and an output signal of a desired stage in the shift register and a count value of the counter to a desired value; 1. An angle signal generating device comprising: a gate circuit that sends out an angle signal corresponding to the logical product of signals sent out when .