JPH0342431B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a transmitting device for Detsuka navigation using a hyperbolic navigation method, and more particularly, to a transmitting device for Detsuka navigation that has a transmission timing that enables hyperbolic navigation even with a simple receiver. .

(b) Problems with the prior art The Detsuka navigation system usually consists of one main station and three slave stations (red station, green station, purple station), and even if the main station and one of the slave stations form a pair, two Receive the radio waves emitted by each station, measure the phase difference, convert the phase difference to distance, find one hyperbola focusing on the two stations, and calculate the distance between the main station and other slave stations. Using a pair of two stations, other two hyperbolas are obtained in the same manner as above, and the position of the ship, etc. is determined from the intersection of the two hyperbolas.

The radio wave transmission schedule of the main station and three slave stations is as shown in FIG. 1 every 20 seconds.

Of the radio wave transmission schedule of the conventional transmitter shown in FIG. 1, the signal of 8.2 (fundamental frequency is about 14 KHz) is used as follows. The 2.5 seconds signal between 17.5 seconds and 20 seconds (0 seconds) is for timing synchronization of each slave station with respect to the time schedule of the master station, and is as described above.
The end of the 2.5 second signal is defined as 0 time.
That is, the slave station receives the 8.2 signal, rectifies it, integrates it, monitors the duration, and if it exceeds 2 seconds, it is used for time synchronization of the master slave station, and the end of the 2.5 second signal is set as zero time, and the reference clock of the slave station is used. is set.

Each red, green, and purple slave station transmits from 0.75 seconds to 2.5 seconds, 3.25
The 1.75 second signals from seconds to 5.0 seconds and from 5.75 seconds to 7.5 seconds are used by the monitoring station to monitor the time synchronization of each station.

0.15 seconds to 0.6 seconds, 2.65 seconds to each master and slave station transmits
The 0.45 second 8.2 signals at 3.1 seconds, 5.15 seconds to 5.6 seconds, and 7.65 seconds to 8.1 seconds are used to provide zone information to the aviation receiver; no 8.2 transmissions occur from 8.1 seconds to 17.5 seconds.

The signals of the other main station 6, red slave station 8, green slave station 9, and purple slave station 5 are emitted almost continuously for coarse and fine position measurement by ships, etc. Therefore, in addition to receiving signals in 8.2, ships are equipped with DEC receivers that receive the four waves mentioned above to measure their positions. For this reason, the Detsuka receiver has the disadvantage that four reception channels are required for position measurement, making the receiver expensive.

(c) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks without impairing the functions of the current Detsuka navigation system.
An object of the present invention is to provide a receiving device for detsuka navigation which is capable of hyperbolic navigation by using an inexpensive receiver.

(d) Structure of the Invention In order to achieve the above object, the present invention provides a DETSUKA navigation transmitter with 8.2 (basic frequency)
By transmitting the 8.2 signal phase-synchronized to the main station at different times from the main station and each slave station for a predetermined time shorter than the 8.2 signal transmission time for time synchronization during the signal pause, the receiver can detect the main station. It is characterized by being able to measure the position of its own station by summarizing the phase differences of the 8.2 signals from the slave station and the slave station.

(e) Embodiments of the invention Examples of the invention will be described below with reference to the drawings. FIG. 2 is a radio wave transmission schedule diagram of a transmitting apparatus according to an embodiment of the present invention, and FIG. 3 is a block diagram of a receiver circuit capable of hyperbolic navigation using an 8.2 signal of the radio wave transmission schedule of FIG. 2.

In the figure, the shaded area in Figure 2 is the newly added radio wave transmission schedule of the 8.2 signal. In Figure 3, 1 is an antenna, 2 is a high frequency amplifier,
3 is a mixer, 4 is an intermediate frequency amplifier, 5 is a phase discriminator, 6 and 11 are multiplexers, 7 is a voltage controlled oscillator for the main station (hereinafter referred to as VCO), and 8 is for the red station
VCO, 9 is VCO for green station, 10 is VCO for purple station, 1
2 is a phase difference measuring device, 13 is a phase difference display meter, 14 is a local oscillator, 15 is a synthesizer, 16 is a time signal generator, and 17 is a rectifier circuit.

The radio wave transmission schedule in Figure 2 is for 8.2 signals.
During the conventional pause period of 8.1 seconds to 17.5 seconds, the monitoring station monitors the time synchronization of each station.In order not to affect the 1.75 seconds of 8.2, it is shorter than this, and is shorter than 0.05 seconds determined by the limitations of the transmitting station's antenna bandwidth. The long 0.8 second 8.2 signal is transmitted at 0.3 second intervals from the main station, red slave station, green slave station, and purple slave station.

That is, the main station is 8.55 seconds to 9.35 seconds and 12.95 seconds to 13.75 seconds.
In seconds, red, green, and purple subordinate stations are respectively 9.65 to 10.45 seconds, 14.05 to 14.85 seconds, and 10.75 to 11.55 seconds.
15.15~15.95 seconds, 11.85~12.65 seconds and 16.25~
It is designed to transmit an 8.2 signal phase-synchronized to the main station every 17.05 seconds. This phase is 0.15~
It may be the same as the signal in 8.2 that each station transmits at 0.6 seconds, 2.65 to 3.1 seconds, 5.15 to 5.6 seconds, and 7.65 to 8.1 seconds. A corresponding receiver has the configuration shown in FIG. In Fig. 3, the signal from the local oscillator 14 is input to the synthesizer 15, and the signal with a frequency of 8.2Δ is input to the mixer 3.
, and mix it with the signal input to mixer 3 via antenna 1 and high frequency amplifier 2 to obtain 8.2(Δ-
) = 8.2F intermediate frequency signal is obtained and sent to the next terminal via an intermediate frequency amplifier 4.

Receives 2.5 seconds of 8.2 sent from the main station,
The output of the intermediate frequency amplifier 4 is input to the time signal generator 16 via the rectifier circuit 7, and if the 8.2 signal continues for 2 seconds or more, it is determined that it is for time synchronization of the master and slave stations, and the end of the 2.5 second signal is set as zero time. , synchronize the time signal generator 16. a second signal from the synchronized time signal generator 16;
At the multiplexer 6, the signal arrives at the transmission time of the newly added 8.2 signal shown by diagonal lines in the figure.
The connections between the phase-based array unit 5 and each of the VCOs 7 to 10 are switched. In other words, when transmitting from the main station, the phase-based array unit 5 and the main station
Connect to VCO7 and use for each slave station when transmitting to each slave station.
Connect the VCO and the phase valve train 5, and connect the VCO 7 for the main station.
is synchronized in phase with the 8.2 signal from the master station for each slave station.
VCOs 8 to 10 are phase synchronized to the 8.2 signal from each slave station. In addition, the output of VCO 7 for the main station that is phase-synchronized with the 8.2 signal from the main station is input to the phase difference measuring device 12, and the output of VCO 8 to 10 for each slave station that is phase-synchronized with the 8.2 signal from each slave station is input to each slave station. 8.2 When transmitting the signal, the multiplexer 11 switches, the phase difference measuring device 12 inputs, and the main station VCO 7 and each slave station VCO
8 to 10 are determined and displayed on the phase difference display meter 13.

The value displayed on this phase difference display meter 13 becomes the value on the hyperbola focusing on the master and slave stations corresponding to 8.2 phase difference on the map, and if you find the intersection of the hyperbolas between the two master and slave stations, you can find the receiver. This makes it possible to determine the location of ships that are currently on the move. The receiver shown in FIG. 3 requires only one high frequency amplifier 2, one mixer 3, and one intermediate frequency amplifier 4 in the receiving channel, and the receiver has 8, 8.2, 5, 6, 9, like the conventional receiver for decks. It can be constructed much more cheaply than the one that had five to receive the data.

Therefore, by setting the radio wave transmission schedule as shown in Figure 2, the current Detsuka navigation system can be improved by installing inexpensive receivers on ships that currently do not have Detsuka receivers. Ships carrying a large number of aircraft can determine their position in an inexpensive manner.

(f) Effects of the Invention As detailed above, the present invention has the effect of enabling hyperbolic navigation using an inexpensive receiver without impairing the functionality of the current Detsuka navigation system.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a radio wave transmission schedule of a conventional transmitting device, FIG. 2 is a diagram showing a radio wave transmission schedule of a transmitting device according to an embodiment of the present invention, and FIG. 3 is a diagram showing a radio wave transmission schedule of a conventional transmitting device.
FIG. 2 is a block diagram of a receiver circuit capable of hyperbolic navigation using the 8.2 signal of the radio wave transmission schedule shown in FIG. The shaded area in Figure 2 is the radio wave transmission schedule of the newly added 8.2 signal. In Figure 3, 1 is the antenna, 2 is the high frequency amplifier, 3 is the mixer,
4 is an intermediate frequency amplifier, 5 is a phase discriminator, 6, 11
is a multiplexer, 7 is a voltage controlled oscillator for the main station,
8 to 10 are voltage controlled oscillators for each slave station, 12 is a phase difference measuring device, 13 is a phase difference display meter, 14 is a local oscillator, 15 is a synthesizer, 16 is a time signal generator, and 17 is a rectifier circuit.

Claims (1)

[Claims] 1. In a DETSUKA navigation transmitter using the hyperbolic navigation method, during the pause of a signal with a frequency 8.2 times the fundamental frequency, the main station and each slave station transmit signals at different times for a predetermined time shorter than the 8.2 signal transmission time for time synchronization.
Detsuka navigation transmission characterized in that by transmitting an 8.2 signal phase-synchronized with the main station, the receiver can determine the phase difference between the 8.2 signals from the main station and the slave station and measure the position of its own station. Device.