JPS5837510B2 - Decca navigation receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power navigation receiver having an automatic lane value setting function.

Of the radio wave navigation systems, the British company Decca
Currently, the most famous phase difference navigation system developed by A.

This method is named "Detsuka Navigation" after the company that developed it.
This term will be used hereafter in this specification as well.

The above Detsuka navigation system is a type of hyperbolic navigation system,
On the transmitting side, three slave stations are arranged approximately at the vertices of a regular triangle, with the main station at the center.

These four stations emit radio waves that maintain a strictly constant phase relationship with each other.

The frequency of the emitted radio waves is an integral multiple of the sliding frequency f, and the main station is 6f, and the three slave stations are 5f, 8f, and 8f, respectively.
Emits a 9f continuous wave.

However, f is usually selected to be about 14 KHz.

A station with a transmission frequency of 5f is called a purple slave station, a station with the same <8f is called a red slave station, and a station with a transmission frequency of 9f is called a green slave station.

The receiving side is usually a ship, which first measures the phase difference between the radio waves coming from the master station and one slave station, then measures the phase difference between the radio waves coming from the master station and another slave station, and then measures the phase difference between the radio waves coming from the master station and another slave station. Navigation becomes easier because the receiving position, that is, the route of the own ship can be accurately known based on the measured values.

Now, the receiver used for this deck navigation is usually equipped with four types of instruments.

Three of them are for displaying zone codes and lane numbers based on the measured phase difference, and are a type of phase difference meter, commonly called a decometer.

The other type of meter is for identifying lanes and displaying the results, and is called a lane discrimination meter, and the other three types of meters are set based on this discrimination meter.

The role of this instrument will be briefly explained below.

When a ship equipped with a DETSUKA navigation receiver enters the range of DETSUKA navigation during a voyage, or when the receiver is turned on again after being inactive for a certain period of time, if the ship is in any zone. Oh, and also, you first need to know if the vehicle is in the designated lane in the zone, and then immediately set the three types of phase difference meters (decometers) to that zone code and lane number.

Of these, the zone code can be known without using the transmission signal of the transmitting station, but in order to know the lane, it must be used in the lane identification signal emitted from each transmitting station.

The lane identification meter measures and displays the own ship's lane number and the first fraction of the number of lanes based on the above lane identification signal, and the ship's crew can use the display on this lane identification meter as an auxiliary means for initial lane setting. The three phase difference meters are set up as shown below.

Conventionally, the setting of the phase difference meter has been done manually by the ship's crew as described above, which is not only troublesome and time-consuming, but also prone to misreading of the lane discrimination meter, wrong setting of the phase difference meter, etc. was there.

Such an error naturally poses a risk of misrecognizing the ship's position and possibly causing it to deviate from the planned route.

The present invention fundamentally solves the above-mentioned problems by automatically setting the lane value of each phase difference meter using an electronic circuit, and will be described in detail below with reference to the drawings.

That is, the figure shows a circuit system diagram of one embodiment of the DETSUKA navigation receiver according to the present invention. In this embodiment, the lane identification signal is of a multi-pulse type, that is, the number of frequency branches is 5f, 6f, 8f, 9f.
shall be used in a chain in which each transmitting station sequentially transmits for a short period of time, and each phase difference meter has all numbers and symbols displayed except for 1/100 (centilane) of the ↓ lane. The elements are configured to provide digital display.

For simplicity, only the "purple" channel of the phase difference meter and its drive circuit system are shown, but the "red" channel and the "red" channel are also shown.
The circuit structure for the green channel is also exactly the same.

In the figure, a lane identification circuit system 1 receives a signal at a frequency f obtained from a multi-pulse received by a receiving section 10 having an antenna, and a signal at a frequency 6 obtained by receiving a transmission signal from the main station.
A lane identification operation is performed based on the signal f, and the result is output as a digital signal up to the first fraction between lanes.

Multi-pulses are sent from the main station and each slave station for 2.5 seconds.
In this embodiment, the digital signals are sent out in a time series similar to the received signal from a single line.

This time-series signal is branched, and one side drives a lane discriminator 3 via a decoder 2, and displays lane numbers up to the first fractional lane, such as ``5m.IJ.''

The other of the branched time-series signals is input to the lane identification signal switching circuit 4.

The switching circuit 4 serves to distribute lane identification signals sent in time series to the corresponding phase difference meters.

That is, according to the present invention, since the display value is set in each phase difference meter based on the output of the lane identification circuit system when the lane number is set during the initial operation of the receiver, the values on the same track are chronologically set. It is necessary to switch and supply the sent lane identification signal to the drive circuit system attached to the corresponding phase difference meter by the lane identification signal switching circuit 4, and the switching circuit 4 is a rotary circuit that switches between three circuits. It has the same effect as a switch.

However, it goes without saying that the switching timing must be set so that the required signal can be sent to the predetermined phase difference meter.

In the figure, P is a line for sending signals to the "purple" phase difference meter, R to the "red" phase difference meter, and G to the "green" phase difference meter, respectively.

The signal passing through the line P passes through the counter control circuit 5, enters the lane number counter 6, drives the digital display section 8 of the phase difference meter via the decoder 7, and displays the lane number, for example "51". display.

In this way, when the receiver starts operating, the integer part of the indicated value of the lane discriminator 3 is automatically transferred to the lane number display section 8, and the initial setting is completed.

From now on, the display section 8 will display only the lane number that does not include the fraction between lanes, that is, the part above the decimal point of the lane number, and the fraction between lanes will be displayed on a rotary meter 9 (hereinafter referred to as fraction meter).
It is carried out by

That is, after the lane numbers are automatically set as described above, the signals corresponding to the phase difference between the signals of the main station and the purple slave station measured by the receiving unit 10 are divided into a pair of mutually orthogonal fractions of 9, as in the conventional case. given as the drive current to the coil,
The fractional total 9 displays the fractional number between lanes in units of centilane, that is, 1/100 lane.

Each time the fraction counter rotates once, the number indicating the lane number on the digital display section 8 is added up one by one.

The above operation is exactly the same for the "red" and "green" phase difference meters, so parts related to both phase difference meters are omitted from illustration.

However, of course, corresponding to the number of lanes related to each phase difference meter, the counter 6 of the "purple" phase difference meter shown in the figure is in 30 decimal,
The counters attached to the "red" and "green" phase difference meters (not shown) are 24-base and 18-base, respectively.

The lane setting has been completed above, and as is clear from the explanations so far, the setting does not require manual adjustment of the instrument; it is simply a simple switch to return to zero, and after the setting is completed, the phase difference meter It is only necessary to perform a switching operation such that the signal is driven by the phase difference between the received signals other than the multipulse.

The receiver according to the present invention described above has the advantage of being able to completely automatically set lane values, thereby eliminating the trouble and time of manual setting, and eliminating errors in operation and reading. There are advantages.

Furthermore, since the handling of the receiver is greatly simplified in combination with the automatic setting of lane values, there is almost no problem in operating the receiver even if an unskilled person operates the receiver.

Therefore, the present invention is extremely advantageous especially when applied to a deck navigation receiver installed in a small ship.

[Brief explanation of drawings]

The figure is a system diagram showing the main structure of a hyperbolic navigation receiver according to the present invention. 1: Lane identification circuit, 2: Decoder, 3: Lane identification meter, 4: Lane classification signal switching circuit, 52 counter control circuit, 6: Lane number counter, 7: Decoder, 8: Digital display section, 9: Fractional number Total, 10: Receiving section.

Claims (1)

[Claims] 1 A lane identification circuit system equipped with a lane identification meter for identifying the lane at the receiving position based on the received lane identification signals from the main station and the slave station and displaying the identified lane number; A display drive circuit system equipped with a lane number display unit that integrates and displays lane numbers in response to the phase difference of continuous waves from the slave station, and a counter that provides a signal corresponding to the lane number to be displayed on the display unit. Further, when setting the initial display value of the lane number display section, a circuit is provided for inputting an identification signal output to the lane discriminator into a counter of the display section drive circuit system, and the display of the lane number display section is further provided. A receiver for deep power navigation, characterized in that the value is automatically set as the initial display value of the lane number display section.