DE754958C - Arrangement for azimuthal direction determination - Google Patents

Description

Arrangement for determining azimuthal direction It is proposed been, for the azimuthal determination of the location of vehicles, in particular of Aircraft, two sharply focused beams at different speeds to be put into circulation and from the time difference of arrival measured at the receiving location the rays go through a normal direction and the connecting line sender-vehicle to determine formed angle. In this procedure, for a certain direction, z. B. the north direction, a certain position of the rotating beams to each other (especially coverage) provided.

The invention relates to an arrangement for azimuthal direction determination, in which sharply bundled radiations execute a pendulum movement and the time span between the successive, when the beam passes through it Bmpfangsort evoked pulses is measured; it is characterized by that the pendulum motion is opposed by two at the same speed rotating, differently modulated beam is generated, which in a coincide in a predetermined direction.

In the figure, A means a bundle of rays with the frequency Mj is modulated and rotates continuously in the direction of the arrow.

B is a beam modulated with M2 and facing each other A rotates continuously in the opposite direction at the same speed.

E is the receiver, the one with the north direction the Forms angle g. Both beams S and B know z. B. during their movement coincide in the East-NVest-Richtullg. So in the arrangement shown the bundle A hit the receiver after going through an angle go + # while the bundle B hits the receiver only after passing through an angle 27o-cp. This The time difference therefore depends on the receiving location. To determine the direction of the From the receiving location, the time difference is measured with which the two rotating Bundle = 4 and B meet recipient E.

Both bundles are modulated with different frequencies so that they can be easily distinguished.

The time difference between the recorded pulses is dependent from the position of the receiver in space, the time difference will be zero when the receiver is in the east-west direction.

If the cycle is very slow, the time difference can be calculated using the Measure the stopwatch by ear. If the circulation takes place faster, one must use other facilities use.

For example, you can convert the DF receive voltages into a capacitor charge convert and determine the time from the capacitor charge. Another example for the time measurement is the following: Mani leads, as before. was suggested the Time measurement into a phase measurement. This is done, for example, in such a way that the differently modulated fundamental and / or certain harmonics of the recorded Pulse frequency demodulated, screened out and fed to a phase measuring device will. The phase shift of the fundamental wave to the rough measurement, the phase shift the harmonics of the same order can be used for fine measurement. About the separation to carry out the two pulses, the carrier waves are advantageously different again modulated, d. H. the one bundle circulating clockwise has a modulation M1, the anticlockwise rotating beam has a different modulation, 112.

The two modulations are made in the receiver by means of sieve arrangements separated and then fed to different circuits that sift out the harmonics.

By another, different modulation of both revolving Directional lobes can be determined at the same time in which quadrant the receiver located. This is done simply by turning to the modulation of the first incoming signs respects or hereby any marking facilities actuated. Namely, the arrangement that works with two rotating bundles is ambiguous, as two opposing quadrants are confused with each other can. The additional modulation removes this ambiguity.

The advantage of this arrangement is that neither the direction of rotation the modulation of the street bundle still needs to be switched, d. H. for Considering the individual bundle, the movement is a continuous rotary movement, for the recipient, however, the impression of a pendulum movement is created.

Claims (5)

PATENT CLAIMS: I. Arrangement for determining azimuthal direction, at which the sharply bundled radiations perform a pendulum movement and the time span between the successive, when passing the beam through the Receiving location-induced pulses is measured, characterized in that the pendulum motion by two oppositely rotating at the same speed, differently modulated bundle of rays is generated, which in a predetermined Direction to come to cover. 2. Arrangement according to claim I. characterized in that the beam come to cover in the east-west direction. 3. Arrangement according to claims I and 2, characterized by the Use of an additional modulation through which the circulating Resistance arising from the bundle of rays is eliminated. 4. Arrangement according to claims I to 3, thereby gekemizeichnet, that the differently modulated fundamental and / or certain harmonics of the recorded Pulse frequency demodulated, screened and fed to a phase detection device will. 5. Arrangement according to claims I to 4, characterized. that the phase shift of the fundamental wave to the rough measurement, the phase shift the harmonics of the same order is determined for fine measurement. To differentiate the subject matter of the invention from the prior art are The following publications were considered in the granting procedure: German Patent Nos. 137,164, 578,145; French patent specification No. 784 345.