JPH0627353U - GPS receiving antenna installed in the rear spoiler for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] A satellite signal from a GPS satellite is suitably received by a GPS receiving antenna provided in a rear spoiler for a vehicle. In a rear spoiler 20 mounted on the rear end of a vehicle 10, a flat plate-shaped GPS receiving antenna 26 is provided so that the receiving surface of the GPS receiving antenna 26 is inclined toward the rear end of the vehicle 10 by a predetermined angle. The antenna gain for the satellite signal from the low elevation satellite S3 behind 10 increases, and the satellite signal can be received properly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a GPS receiving antenna mounted on a rear end of a vehicle and disposed in a rear spoiler for a vehicle, which realizes stable high-speed running performance by pressing the vehicle against a road surface by utilizing an air flow at a high speed. .

[0002]

[Prior art]

 In order to confirm or determine the current position, traveling speed, etc. of an object that moves from moment to moment, such as a ship or an aircraft, in recent years, the Global Positioning System (Grobal Positioning System) , Hereinafter, referred to as GPS). A GPS positioning device that processes the current position of a moving vehicle by receiving radio waves from multiple satellites belonging to this GPS can be used continuously at any time in the world (1). It has features such as (2) extremely high accuracy of position and speed measurement, and (3) unlimited number of users. Therefore, by using the GPS positioning device, it is possible to check the current position of the user in a short time, avoid traffic congestion in urban areas, and find a detour to a destination. If this is possible, it will be possible to obtain a very large profit in terms of time and money.

By the way, as shown in FIG. 5 and FIG. 6, in a traveling automobile 1, a substantially flat antenna 2 is provided on the rear spoiler 3 in order to receive radio waves from GPS satellites 6 and 7. It is attached to the center in a substantially horizontal state.

[0004]

[Problems to be solved by the device]

 By the way, it is preferable that the antenna 2 also receives radio waves from a GPS satellite 7 having a low elevation angle, but in the conventional example, the antenna 2 is attached in a substantially horizontal state along the upper surface 4 of the rear spoiler 3. . Therefore, behind the antenna 2, as shown by the directional pattern 8, the horizontal gain of the antenna 2 is insufficient, so that the radio wave from the GPS satellite 7 having a low elevation angle cannot be received in a good state. There is an inconvenience.

The present invention has been made in order to overcome the above-mentioned inconvenience, and a GPS antenna for receiving a substantially flat plate is provided to a rear spoiler mounted on a rear end of a vehicle. It is an object of the present invention to provide a GPS receiving antenna arranged in a rear spoiler for a vehicle, which can favorably receive satellite signals by arranging the same at a predetermined angle to the side.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a flat-plate-shaped GPS receiving antenna disposed on a rear spoiler mounted on a rear end portion of a vehicle, the receiving surface of the GPS receiving antenna being a rear surface of the vehicle. It is characterized in that it is disposed on the rear spoiler with a certain angle of inclination toward the end side.

[0007]

[Action]

 The GPS receiving antenna provided in the vehicle rear spoiler according to the present invention is provided in the rear spoiler with the receiving surface of the GPS receiving antenna inclined to the rear end side of the vehicle by a predetermined angle. Due to the inclination of the receiving surface of the antenna, the antenna gain for the signal from the low elevation satellite behind the vehicle is increased, and the satellite signal from the low elevation satellite can be preferably received.

[0008]

【Example】

 The GPS receiving antenna arranged in the vehicle rear spoiler according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 are schematic views of a vehicle 10 equipped with a GPS receiving antenna according to the present invention.

As shown in the figure, an automobile 10 comprises a body 12, a roof 14 integrally formed on the upper portion of the body 12, and wheels 16. A rear spoiler 20 is mounted on the trunk lid 18 at the rear end of the body 12. This rear spoiler 20 exerts driving force and braking force by pushing the vehicle body of the automobile 10 against the road surface by the airflow flowing along the surface of the rear spoiler 20 while the automobile 10 is traveling at high speed. is there. A flat plate-shaped GPS receiving antenna 26 is disposed inside the substantially central portion of the rear spoiler 20, and the receiving surface of the GPS receiving antenna 26 is inclined toward the rear end side of the vehicle by a predetermined angle.

The GPS receiving antenna 26 arranged in the vehicle rear spoiler 20 of the present embodiment is basically configured as described above, and next receives radio waves from GPS satellites S1 to S3, A case where the current position of the traveling vehicle 10 is measured by this will be described.

First, the overall configuration of the GPS receiver will be briefly described. That is, as shown in FIG. 3, in the GPS reception unit 28 that processes the transmission radio waves from the GPS reception antenna 26, the transmission radio waves modulated by the PN code are frequency-converted by a frequency converter and are amplified. , Is introduced into the correlator, and in this correlator, PN demodulation is performed by the signal sent from the PN code generator mounted on the automobile 10. That is, as shown in FIG. 4, since the transmission radio waves from the GPS satellites S1 to S3 are spread spectrum by the PN code, here, they are despread by the signal from the PN code generator, and then, Synchronous detection is performed. This synchronous detection signal is reintroduced into the PN code generator, and the signal generation control of the PN code generator is performed so that it is despread with the radio wave including the PN code that is constantly transmitted. On the other hand, the signals related to the received radio waves thus obtained are counted based on the clock frequency sent from the reference oscillator to obtain pseudo distance data.

That is, here, since there is a clock offset between the time measuring device mounted on the automobile 10 and the atomic clocks mounted on the GPS satellites S1 to S3, the distance data including this clock offset is simulated. Distance data is obtained. This pseudo distance data is sent to the arithmetic processing unit 30 and can be obtained by arithmetically processing the current position information of the automobile 10.

Therefore, when the radio waves transmitted from the GPS satellites S1 to S3 are received by the GPS receiving antenna 26, the control unit 32 performs optimum positioning of the traveling vehicle 10 with respect to the GPS receiving unit 28. Command the selection signal of the GPS satellite to transmit.

In this way, when measuring the traveling speed, the position and the current position of the automobile 10 using the GPS satellites S1 to S3, the optimum GPS satellite having the best geometrical positioning accuracy is obtained. Select. When the GPS receiving unit 28 obtains the pseudo distances for the three selected GPS satellites S1 to S3 by the process, the arithmetic processing unit 30 has already received and obtained the pseudo distance data. A two-dimensional positioning navigation equation is created from the positions of the three GPS satellites S1 to S3 derived from the navigation message data, and the present position of the vehicle 10 can be obtained by solving the equation. In this way, the current position, the traveling direction, the speed, the clock offset of the GPS navigation device, and the clock offset change rate of the GPS navigation device obtained by solving the navigation equation are once sent to the memory 34 and stored. To be done. On the other hand, these data are sent to the display unit 36, and at least the current position of the automobile 10, the traveling direction and the speed can be displayed on the screen.

Here, as shown in FIG. 4, for example, the radio wave transmitted from the front of the automobile 10 is transmitted from the GPS satellite S 2 having a high elevation angle that is not shielded by the roof 14 of the automobile 10. On the other hand, with respect to the radio waves transmitted from the rear of the automobile 10, the flat GPS receiving antenna 26 is inside the rear spoiler 20, and the receiving surface of the GPS receiving antenna 26 is the rear end side of the vehicle. Since it is arranged so as to be inclined to, it is possible to receive a signal from the low-elevation angle satellite S3, which is lower than the conventional one. In this case, as shown by the directivity pattern 19 in FIG. 4, the GPS receiving antenna 26 increases the antenna gain with respect to the signal from the GPS satellite S3 in the rear of the vehicle 10, and preferably receives the satellite signal. You can

When the GPS receiving antenna 26 is tilted to the rear end side of the automobile 10 by a predetermined angle, the antenna gain in the direction of the GPS satellite S1 in front of the automobile 10 becomes low, but the GPS satellite S1 has a high elevation angle. Therefore, a radio wave having a high received signal level can be used, and a good signal can be obtained.

[0018]

[Effect of device]

 According to the GPS receiving antenna provided in the vehicle rear spoiler according to the present invention, the following effects can be obtained.

That is, the GPS receiving antenna is arranged in the rear spoiler with the receiving surface of the GPS receiving antenna inclined toward the rear end of the vehicle by a predetermined angle. Therefore, due to the inclination of the receiving surface of the antenna, the antenna gain for the signal from the low elevation satellite behind the vehicle increases, and the satellite signal from the low elevation satellite can be preferably received.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state in which a GPS receiving antenna according to the present invention is arranged in a rear spoiler of an automobile.

FIG. 2 is a perspective view showing a state in which a GPS receiving antenna according to the present invention is arranged in a rear spoiler of an automobile.

FIG. 3 is an explanatory diagram of a block circuit of a GPS receiving device and the like.

FIG. 4 is an explanatory diagram showing a relationship between a GPS receiving antenna arranged on a rear spoiler of an automobile and a GPS satellite.

FIG. 5 is a perspective view showing a state in which an antenna according to a conventional example is arranged in a rear spoiler of an automobile.

FIG. 6 is a partial cross-sectional view showing a state in which an antenna according to a conventional example is arranged in a rear spoiler of an automobile.

[Explanation of symbols]

 10 ... Car 19 ... Directivity pattern 20 ... Rear spoiler 26 ... GPS receiving antenna S1, S2, S3 ... GPS satellite

Claims (1)

[Scope of utility model registration request] 1. A flat-plate-shaped GPS receiving antenna disposed on a rear spoiler attached to a rear end of a vehicle, wherein a receiving surface of the GPS receiving antenna is inclined toward a rear end of the vehicle by a predetermined angle. A GPS receiving antenna arranged in a rear spoiler for a vehicle, which is arranged in a rear spoiler.