JPS601432Y2 - Movement speed measuring device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that measures a position by receiving positioning signals such as a Loran signal or an Omega signal, and at the same time measures a moving speed.

Generally, when measuring moving speed, a positioning mechanism for measuring position and a time measuring mechanism for measuring time are required.

By the way, in positioning systems such as Loran and Omega, the system itself transmits positioning information at fixed time intervals, so if the interval at which the information is received is used as elapsed time information, a new time measurement mechanism can be installed. You can calculate the speed without it.

This invention measures the moving speed based on the above-mentioned principle, and will be explained below with reference to the embodiments shown in the drawings.

In Fig. 1, numeral 1 is a positioning receiver that receives not intermittent reception signals such as satellite navigation signals, but positioning signals that constantly arrive at a constant repeating period, such as Loran signals or Omega signals, to determine the reception position. Perform position measurement.

Position measurement is performed based on phase information of the Loran signal or the Omega signal.

That is, for the Loran signal and the omega signal, the positions are measured by comparing the phases of signals arriving from transmitting stations at different positions and measuring the phase difference or time difference between the two signals.

This position measurement is known as hyperbolic navigation.

The measurement results are sent to the position change calculation circuit 2.

The position change calculation circuit 2 detects the position change of the measurement position measured by the positioning receiver 1 and calculates the moving distance.

At this time, the moving distance is calculated based on the time detected by the moving time detection circuit 3.

The travel time detection circuit 3 detects travel time from the time interval of positioning signals received by the positioning receiver 1.

For example, the Loran signal transmits Loran pulses with a unique predetermined repetition period.

Therefore, by measuring the number of times a Loran pulse is received, it is possible to measure the time between them.

The position change calculation circuit 2 calculates the amount of position change within the time detected by the movement time detection circuit 3.

The detection time of the movement time detection circuit 3 is sent to the speed calculation circuit 4 as the movement time of the receiving point, and the amount of position change of the position change calculation circuit 2 is sent as the movement distance.

The speed calculating circuit 4 calculates the moving amount per unit time, that is, the moving speed, based on the moving distance and moving time.

As described above, according to this invention, speed can be calculated without providing a new time-measuring mechanism.

In addition, since the travel time is measured from the signal period of the positioning signal, when calculating the travel speed, there is no need to consider the command execution time, etc., and the timing between the positioning mechanism and the elapsed time mechanism can be calculated. Since there is no need to take this into account, the configuration of the speed measurement system becomes easy.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of this invention, in which 1 is a positioning receiver, 2 is a position change calculation circuit, 3 is a travel time detection circuit,
4 indicates a speed calculation circuit.

Claims (1)

[Scope of utility model registration request] - a positioning device that receives a positioning signal of a Loran signal or an omega signal that arrives at a time interval of f and performs position measurement based on the phase information of the positioning signal; and a positioning device that detects a travel time from the number of arrivals of the positioning signal. a travel time detection device, a position change calculation circuit that calculates a position change within the travel time detected by the travel time detection device from the positioning result of the positioning device, and the amount of position change calculated by the position change calculation circuit and the detection. A moving speed measuring device comprising: a moving speed calculation circuit that calculates a moving speed based on the calculated moving time.