CN203204161U

CN203204161U - Knocking-type pulse-trigger INS/GPS time synchronizer

Info

Publication number: CN203204161U
Application number: CN 201320234302
Authority: CN
Inventors: 牛小骥; 张辉; 郭文飞; 翟冰; 罗国军; 王青江
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2013-05-03
Filing date: 2013-05-03
Publication date: 2013-09-18
Anticipated expiration: 2023-05-03

Abstract

The utility model provides a knocking-type pulse-trigger INS/GPS time synchronizer. The knocking-type pulse-trigger INS/GPS time synchronizer includes a knocking hammer, a pulse generating circuit and pulse output interface sequentially connected together. The knocking hammer includes a pipe barrel; and a hammer, a spring, a connection rod and a fixed board with a hole disposed in the pipe barrel. The knocking hammer accounts to a normally-closed switch. The INS is enabled to output time characteristic waveform through knocking an INS with the hammer of the knocking hammer. At the same time, a switching-on/off trigger pulse generating circuit of the normally-closed switch sends pulses to a GPS receiver, so that the GPS receiver is triggered to record accurate time mark and position information of pulse generation time. By utilizing the accurate time mark recorded by the GPS receiver for matching with the characteristic waveform output by the INS, precise INS/GPS time synchronization is realized. The knocking-type pulse-trigger INS/GPS time synchronizer provided by the utility model is simple in structure, convenient to operate and high in time synchronization precision.

Description

The pulsed INS/GPS time synchronism apparatus of a kind of impacting type

Technical field

The utility model relates to the pulsed INS/GPS time synchronism apparatus of a kind of impacting type.

Background technology

GPS has that bearing accuracy is high, the error advantage such as in time accumulation not, and when using carrier phase observation data, its bearing accuracy can reach centimetre-sized, but GPS exists also that signal is easily blocked or interference, data updating rate are low, lack the shortcomings such as attitude information output; Comparatively speaking, inertial navigation system (INS) is a kind of fully autonomous navigational system, and it has high data updating rate, and possesses attitude information output, but because the existence of gyro error drift, even high-precision INS also faces the problem that error is constantly accumulated along with the navigation time lengthening.Theory and practice is verified, and the INS/GPS integrated navigation system can significantly improve the navigation accuracy of navigational system and to the adaptability of environment.

Before the INS/GPS Integrated Navigation Data Fusion resolves, prerequisite when INS and GPS output data are separately carried out high-precision time synchronized.But the two is often because life period starting point and benchmark are inconsistent, and data output rate is inconsistent, and the factors such as circuit delay are for INS/GPS time synchronized aligning causes difficulty.For the synchronous problem of INS and gps time, conduct extensive research both at home and abroad, summed up hardware approach, software approach, the method for software and hardware combining.Wherein often algorithm design is complicated in order to realize high precision alignment for software approach, calculated amount is large, and precision is limited, adopts custom-designed INS/GPS integrated sync circuit often can obtain preferably synchronous effect, still, often for particular device, versatility is not strong, and hardware design and the manufacturing capacity of scientific research and application units' various equivalent modifications are had relatively high expectations, and manufactures and designs special hardware synchronization module for various hybrid navigation equipments, need to expend a large amount of manpowers, the material resources cost is higher.Especially, in recent years, along with cheap, the relatively poor MEMS inertial navigation element application of precision was popularized in a large number, designed targetedly the high-precise synchronization circuit and lost more than gain.A kind of simple and convenient INS/GPS time synchronized solution is badly in need of in a lot of scientific researches and application units.

The utility model content

The utility model provides a kind of simplicity of design for above-mentioned technical matters, highly versatile, and can guarantee the pulsed INS/GPS time synchronism apparatus of impacting type of enough synchronization accuracies.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

The pulsed INS/GPS time synchronism apparatus of a kind of impacting type, comprise successively connect knock hammer, pulse generation circuit, pulse output interface; Knocking hammer comprises socket and is positioned at the tup, spring, connecting rod of socket, fixed head with holes; The two ends of fixed head all are fixed on the socket inwall, and tup is fixed on the connecting rod, and connecting rod passes the hole of fixed head and is connected with fixed head by copper contact, and the two ends of spring are connected with tup, fixed head respectively; Copper contact is connected with pulse generation circuit by potentiometer.

Described pulse generation circuit comprises two selector switch, power supply, two resistance; Generate high impulse or low pulse by two selector switch gating pulse generative circuits.

Described socket is made by the PVC material.

During use, INS is installed in tup below and near the position of tup; The hammer that knocks in the utility model is equivalent to a normally closed switch, and when not having power to impose on tup, the copper contact on connecting rod and the fixed head is permanently connected to, and is equivalent to the normally closed switch closure; When applying downward acting force to tup, tup impacts INS when artificial, and spring is compressed, and connecting rod stretches out downwards by the hole on the fixed head, and the copper contact on connecting rod and the fixed head separately is equivalent to normally closed switch and disconnects.

During the utility model work, by apply downward power (normally closed switch disconnection) to tup, tup knocks INS and makes its output time signature waveform, normally closed switch break trigger pulse generation circuit sends pulse, and by in the pulse output interface input GPS receiver, thereby trigger GPS receiver recording impulse precise time label and positional information constantly occuring, utilizes the precise time label of GPS receiver record and the signature waveform coupling of INS output can realize accurate INS/GPS time synchronized; By the manual control selector switch, make pulse generation circuit generate high impulse or low pulse, select corresponding pulse pattern for the receiver of different model.

Compared with prior art, the utility model is simple in structure, and is easy to operate, and timing tracking accuracy is high, highly versatile.It can be used for INS(or IMU) and the gps time field of synchronization, give markers for the data that lack the collection of the unsettled inertial navigation element of clock or clock, the stability in detection inertial navigation component data source and the fields such as stability of inertial navigation element internal clock are applicable equally.

Description of drawings

Fig. 1 is overall circuit schematic diagram of the present utility model;

Fig. 2 is the equivalent circuit diagram that produces high impulse in the utility model;

Fig. 3 is the equivalent circuit diagram that produces low pulse in the utility model;

Fig. 4 is the structural representation of striking head in the utility model.

Wherein, 1-normally closed switch, 2-selector switch, 3-pvc pipe cylinder, 4-tup, 5-spring, 6-connecting rod, 7-fixed head, 8-copper contact.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

As shown in drawings, the utility model comprise successively connect knock hammer, pulse generation circuit, pulse output interface RS232; Knocking hammer comprises pvc pipe cylinder 3 and is positioned at the tup 4, spring 5, connecting rod 6 of socket, fixed head 7 with holes; The two ends of fixed head all are fixed on the socket inwall, and tup is fixed on the connecting rod, and connecting rod passes the hole of fixed head and is connected with fixed head by copper contact 8, and the two ends of spring are connected with tup, fixed head respectively; Copper contact is connected with pulse generation circuit by potentiometer; Pulse generation circuit comprises two selector switch 2(K2, K3), 5V power supply, two resistance (R1, R2), R1 is that resistance is the digital resistance of 1K, R2 is that resistance is the digital resistance of 10K; Generate high impulse or low pulse by two selector switch gating pulse generative circuits.

Under the state of Fig. 1, the equivalent electrical circuit of its formation as shown in Figure 2; When not knocking tup, R2 is output as 0 by short circuit; After knocking tup, the R2 place in circuit, both end voltage is (10/11) * 5V=4.5V, namely produces a pulse from low to high, pulse triggers response by the designated port that the RS232 interface is input to the GPS receiver.

The hammer that knocks in the utility model is equivalent to normally closed switch 1(K1), when not having power to impose on tup, the copper contact on connecting rod and the fixed head is permanently connected to, and is equivalent to the normally closed switch closure; When applying downward acting force to tup, tup impacts INS when artificial, and spring is compressed, and connecting rod stretches out downwards by the hole on the fixed head, and the copper contact on connecting rod and the fixed head separately is equivalent to normally closed switch and disconnects.

Claims

1. pulsed INS/GPS time synchronism apparatus of impacting type is characterized in that: comprise connect successively knock hammer, pulse generation circuit, pulse output interface; Knocking hammer comprises socket and is positioned at the tup, spring, connecting rod of socket, fixed head with holes; The two ends of fixed head all are fixed on the socket inwall, and tup is fixed on the connecting rod, and connecting rod passes the hole of fixed head and is connected with fixed head by copper contact, and the two ends of spring are connected with tup, fixed head respectively; Copper contact is connected with pulse generation circuit by potentiometer.

2. the pulsed INS/GPS time synchronism apparatus of a kind of impacting type according to claim 1, it is characterized in that: described pulse generation circuit comprises two selector switch, power supply, two resistance; Generate high impulse or low pulse by two selector switch gating pulse generative circuits.

3. the pulsed INS/GPS time synchronism apparatus of a kind of impacting type according to claim 1 and 2, it is characterized in that: described socket is made by the PVC material.