DD229866A1 - HYPER LIGHTING METHOD AND ARRANGEMENT FOR CARRYING OUT THE PROCESS - Google Patents

Abstract

The invention relates to a Hyperbelortungsverfahren and an arrangement for carrying out the method. The object of the invention is to determine the transit time differences by phase comparison and build up and dismantle the arrangement temporally successive in different territories. According to the invention, the object is achieved by forming a envelope curve from two RF signals and by performing the necessary phase comparisons with the envelope curves. The arrangement for carrying out the method consists of a control center, at least three measuring stations and a mobile radio station to be located. Fig. 1

Description

A, B = amplitudes of the two radio signals (unmodulated carriers)

Ψΐ / Φ2 = phase angles of the two radio signals

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ω = carrier frequency of the first radio signal ω + Δω = frequency of the second radio signal are added together

U = U ₁ + U ₂ = -j / A ² + B ² + 2 BA

with Έ. = cp ₂ - φ, = phase position of the envelope The phase angle of the envelope £ thus corresponds to the phase difference φ ₂ - φ, between both RF signals. Include the

Phase positions φ, and cp ₂ the transit times between transmitter and receiver with L = path length between the first transmitter and the receiver

X = path length between the second transmitter and the receiver

with C = speed of light Φιο. Ψ2ο = phase position of the RF signals of both transmitters The control center Z and the radio station to be located supply the two radio signals to be compared, each to each of the

three receivers E1, E2 and E3 provide a beating figure. Between the two transmitters of the control center Z and the radio station to be located as well as the 3 receivers are the following distances:

X _I Distance between measuring station E1 and SX ₂ Distance between measuring station E2 and SX ₃ Distance between measuring station E3 and S L1 Distance between measuring station E1 and Z L2 Distance between measuring station E2 and Z L3 Distance between measuring station E3 and Z Since the coordinates of the measuring stations are known can be assumed, the distances L1, L2 and L3 are given. The locations of E1, E2 and E3 form the foci of two hyperbolas with the differences determined by measuring the phase angles of the envelopes at the measurement station. D1 = X1 - X3 (= constant) D2 = Xi - X2 (= constant) With the relative differences

D1 _Λ D2

^d 2 =

and the sizes

one obtains the point of view of the radio station S to be located in polar coordinates

Γ = S.

JB ² - C ² · sin 6 " -H

B ² -C ² , r, C

-3 CSp - g-i · cos σ) - g ^ - ,, sxn

B ^ ' ¹ B-

J ρ p »

cos X = -C (g.g.coscT) +. G

with the abbreviations:

B ² = Qi + 9i-2 g, g ₂ -cos5 C = d ^ j-djg!

H = d ₁ (g ₁ -g ₂ -cos5) + d ₂ (g ₂ -g ₁ -cos5) With known path differences D ₁ and D ₂ as well as known coordinates of the control center Z and the measuring stations E1, E2 and E3

In this way the position of station S can be determined.

To determine the path differences D ₁ and D ₂ , the phase differences of the envelopes at three measuring stations are based

placed. For comparison, the three envelopes present as low-frequency signals in the measuring stations E1, E2 and E3

the control center via cable, VHF radio transmission or similar transmission facilities.

There the phase differences between the envelopes are made, for example by a time measurement, as in

3 is shown.

The phase positions (not absolutely determinable) obtained by the duration of the low-frequency signal from the measuring station to the control center

another change of size

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so that one has to have the following envelope phase positions in the control center:

Measurable are only the phase differences

However, the required path differences D ₁ = X ₃ - X ₁ and D ₁ = X ₂ - X ₁ included

 It is with it

Claims (3)

-2- 710 69 Inventions claim: 1. Hyperbelortungsverfahren, are used in the incoherent radio waves and in which the transit time differences are determined by phase comparison, characterized in that an envelope is formed from two un-modulated RF signals and the phase comparisons are performed on the envelopes, wherein both RF signals at the antenna base each result in a beat figure, which are amplified and demodulated by the receiver, and the resulting low-frequency signal corresponding to the beating figure, fed to a control center and evaluated there. 2. Arrangement for carrying out the method according to item 1, characterized in that the same from a control center,. at least 3 measuring stations and one to be located mobile radio station exists. For this 2 pages drawings Field of application of the invention The invention relates to a Hyperbelortungsverfahren and arrangement for carrying out the method, in particular for-building and measuring work applicable. Characteristic of the known technical solutions Known is a positioning method of DE-PS 3129490, in which the phase angles of all occurring during the respective predetermined time zero crossings of a corresponding transmitter are measured against a predetermined reference time, and that from these phase angles an average of the congruent modulo the period of the sampled waves lying phase positions is formed. A disadvantage of this method is that synchronized radio signals are required to carry out the positioning method. Also known is a radio navigation system according to DE-OS 2355909, in which the beacon has a reference antenna and a main antenna line, the reference antenna radiating a first and a second radio frequency, wherein the second radio frequency from the first radio frequency differs by an audible frequency that the Antennas of the main antenna line sequentially radiate a third frequency, which differs from the second frequency by a frequency below the audible range, whereby the motion of a single antenna is simulated in one or both directions and that in the radio receiver, the angle is determined by counting the beat frequency. The disadvantage here has the effect that special separate facilities must be present as a result of the required antenna lines, the RF feed is done by automatic switching from antenna to antenna. In addition, a receiver for the reception of two transmitter signals is known in DE-PS 3000149. The measurement of the transit time difference takes place at the beat figure, which is formed in the receiver after the intermediate frequency gain. This requires a special dual receiver with equivalent features in both receivers. Object of the invention The aim of the invention is to eliminate the disadvantages of the known methods as far as possible. Explanation of the essence of the invention The invention has for its object to provide a Hyperbelortungssystem and an arrangement for carrying out this method, in which the transit time differences are determined by phase comparison and the arrangement of which creates the ability to build the same temporal succession in different territories and. According to the invention the object is achieved in that an envelope is formed from two RF signals and necessary phase comparisons are made with the envelopes. The associated arrangement for carrying out this method consists of a control center, in which the controls of the measurements and the location determination is made from at least three measuring stations and from the mobile radio station to be located. The control center contains a radio transmitter which emits the carrier frequency. The mobile radio station to be located consists of a radio transmitter emitting the frequency carrier frequency and frequency difference. The frequency difference is in the low frequency range. The high-frequency signals of the two transmitters are received by the antennas of the three measuring stations. Both signals, which are re-modulated, each result in a beating figure at the antenna base, which is amplified and demodulated by the receiver. The resulting low-frequency signal, which corresponds to the beating figure, is fed to the control center and evaluated there. The beat figure received by a measuring station has a phase relationship which contains the transit time difference of the two radio signals. This feature makes it possible to determine the location of the radio station to be located by means of a suitable evaluation of the phase positions of the three beating figures in the control center. embodiment The invention will be explained in more detail below using an exemplary embodiment. The accompanying drawings show: Fig. 1 arrangement for the locating method Fig.2 Determination of the coordinates of the point S Fig.3 Measurement of the difference time t ₂ i Formation of the envelope: The two high frequency signals (cj6 + <? _A )