CN1696737A

CN1696737A - Device for aligning imaging times among remote sensing multiple sensors

Info

Publication number: CN1696737A
Application number: CN 200510026169
Authority: CN
Inventors: 徐卫明; 王建宇; 舒嵘
Original assignee: Shanghai Institute of Technical Physics of CAS
Current assignee: Shanghai Institute of Technical Physics of CAS
Priority date: 2005-05-25
Filing date: 2005-05-25
Publication date: 2005-11-16

Abstract

An aligning device of imaging time for remote sensing multisensor consists of multiple sensors in imaging equipment, multiple coaxial cable interface, GPS receiver and GPS antenna, programmable component, storage unit, computer interface and computer. The present invention has simple structure and it can realize that error of general utilization and time alignment is less than 1 microsecond.

Description

Remote sensing multiple sensors imaging time alignment device

Technical field:

The present invention relates to a kind of synchronous device of remote sensing multiple sensors imaging, particularly a kind of remote sensing multiple sensors imaging time aligning equipment.

Background technology:

During the remotely sensed image equipment work, normally be separated into picture, i.e. imaging at set intervals once, the asynchronism(-nization) of each imaging, if single device, there is not the alignment issues of data, when only needing data recording, provide the relative time of recording unit itself just passable simultaneously, as be used for the computer time of record data.

But in the Aero-Space remote sensing of reality, often being that a plurality of imaging sensors need be gathered the image in some areas simultaneously, owing to be a plurality of sensor devices that separate, accurately demarcating each moment of each sensor imaging, but is very much trouble usually.For example, certain airborne remote sensing test, used the pull-broom type imaging spectrometer, area array cameras and attitude measurement equipment etc., wherein attitude measurement equipment is GPS (Global Positioning System, GPS) and the unit equipment of inertial measurement system, the output data sign of itself has gps time, if desired the pull-broom type imaging spectrometer, the data alignment of area array cameras and attitude measurement equipment, traditional method is that a GPS receiver all is installed respectively on imaging spectrometer and area array cameras, their output data is all aimed at gps time, so the data of total system can be aimed at gps time, but each equipment all needs a GPS receiver like this, the waste resource, and every GPS receiver works independently, and the gps time of its record may itself have certain difference, therefore, increased the data alignment error of system, for follow-up data processing band difficulty.

In Aero-Space remote sensing, above this situation be recurrent, when designing a new system, all need to rethink the aligning of data at every turn, especially developed into the epoch of paying special attention to quantification in remote sensing now, the accurate aligning of data more and more seems important.

Summary of the invention:

The purpose of this invention is to provide a kind of general data recording that can accurately demarcate remotely sensed image sensor device constantly, make the accurate aligning of multi-sensor data simple.In view of the remotely sensed image sensor constantly can send a pulse signal in imaging, and the GPS receiver is installed all generally, and in the data of gathering of being everlasting, write down gps data simultaneously, be used for nominal data collection time and position constantly, therefore, thinking of the present invention is exactly that the data of all sensor record are all used same GPS receiver time calibrating, and method is simple, general.

Technical scheme of the present invention is as follows:

According to a kind of remote sensing multiple sensors imaging time alignment device of the present invention, it is applicable to it is the imaging time aligning of two remote sensor imaging devices at least, comprise a plurality of sensors, lay respectively at and be provided as picture pulse signal constantly in the many sensing imaging device of remote sensing; A plurality of coaxial cable interfaces, the imaging that corresponding these a plurality of sensors of reception provide is pulse signal constantly, and forms effective porch, and gps antenna is installed on spacious place, so that receive gps satellite signal unobstructedly; The GPS receiver connects this gps antenna and contains the feed-in gps satellite signal, and gps time data-signal (standard signal) and per second pulse per second (PPS) once are provided; Programming device, effective edge edge and the gps time data and the pulse per second (PPS) of the imaging of receiving sensor pulse constantly, thereby calibration sensor imaging aligning time data constantly; Memory device is divided into a plurality of subregion storages corresponding to these a plurality of sensor imagings nominal time data constantly; Computer interface and computing machine, this computing machine connects this memory device by this computer interface, regularly from memory device pickup imaging nominal data and form the formatted file record and deposit calculator memory in constantly.

Further, said coaxial cable interface forms the effective edge of sensor imaging pulse constantly along the rising edge of a pulse or the negative edge that are meant default;

Said programming device is meant after it receives the GPS standard signal (gps time data) and pulse per second (PPS) of the new input of GPS receiver at every turn the demarcation of sensor imaging time, the GPS standard signal is stored on the register of its inside, note is made BASE_GPS_REG, and make its inner pulse oscillator output time clock that refinement is carried out in its pulse per second (PPS) simultaneously, and be provided with a counter register CNT_REG begin the counting, the imaging pulse constantly that the some sensors that received in count pulse n-hour are sent here gives gps time and is marked as SENSOR_TIME=BASE_GPS_REG+CNT_REG * refinement clock cycle, more specifically, described refinement clock cycle is 0.1 microsecond.

Advantage of the present invention is: equipment is simple, general, can be suitable for present most of remote sensing multiple sensors imaging devices, and the error of time alignment can be better than 1 microsecond.

Description of drawings:

Fig. 1 is the circuit theory diagrams of device of the present invention.

Fig. 2 sends to the GPS standard time and the per second transmission pulse per second (PPS) synoptic diagram once of programming device for GPS receiver among the present invention.

Fig. 3 carries out refinement for programming device inside among the present invention to pulse per second (PPS) synoptic diagram.

Embodiment:

Provide better embodiment of the present invention according to Fig. 1-Fig. 2 below, and described in detail, so that further provide ins and outs of the present invention, enable architectural feature of the present invention and functional characteristics are described better, but be not to be used for limiting scope of the present invention.

Consult Fig. 1, present embodiment is applicable to that remote sensing multiple sensors imaging device platform number is at least 2 occasion, as shown in the figure, the present invention includes: multisensor 100, it contains sensor 1,2 ..., n, n is≤2 positive integer, and these sensors all lay respectively in the corresponding remote sensor imaging device; After connect the coaxial cable interface 200 of this multisensor 100, its each coaxial cable interface connects a corresponding sensor, receives the imaging pulse constantly that a corresponding sensor is sent here;-gps antenna 700, it can unobstructedly receive gps satellite signal; The GPS receiver 800 that connects this gps antenna 700, it provides gps time data (being the pulse per second (PPS) PPS pulse once of GPS standard time and per second); Programming device 300, its gps time data deposit an inner register in and refinement are carried out in per second pulse per second (PPS) once counted, when receiving a certain sensor imaging pulse constantly, promptly make time data and demarcate, and it is temporary to memory device to send calibration result; Memory device 400 is used for temporary multisensor imaging imaging time constantly from programming device according to calibration result; Computer interface 500; An and computing machine 600, it regularly reads to deposit the sensor imaging time data scaling result who is kept in the memory device 400 by computer interface 500, storage space in this memory device 400 is divided into and the corresponding several subregions of this multisensor, and its each sensor imaging time data scaling result who keeps in is formed formatted file and is stored in this computing machine 600.

The step of apparatus of the present invention work is as follows:

1, gps antenna 700 is erected at spacious district, makes antenna can unobstructedly receive gps satellite signal.

2, the coaxial cable interface 200 that a plurality of imaging sensor 100 imagings pulses constantly are sent to by concentric cable, setting be rising edge of a pulse, or negative edge effective.

3, start computing machine 600, each imaging device is tried out respectively, send several pulses, the checkout equipment operate as normal is not.

4, start multisensor imaging time alignment device operate as normal of the present invention, recording impulse data.Can start imaging sensor 100 work then.

5, each sensor imaging device produces a time alignment file storage in computing machine 600, has accurately demarcated its imaging gps time constantly.

Consult Fig. 2, after GPS receiver 800 receives the satellite-signal operate as normal, can transmit the constantly corresponding gps time data of pulse, as shown in the figure: gps time T1-GPS time T 2=1 second.

Consult Fig. 3, GPS receiver 800 per seconds send the gps time of a pulse per second (PPS) and correspondence to programming device 300.After programming device 300 receives these data, this gps time is stored in the register of its inside, make BASE_GPS_REG as note, the pulse oscillator (not shown) established in it of programming device 300 usefulness simultaneously, the crystal oscillator of 10M for example, the pulse per second (PPS) refinement that GPS receiver 800 is sent here is divided into clock cycle

1 second/10M=0.1 microsecond.As shown in the figure, after receiving the signal of GPS receiver 800 at every turn, as gps time signal among the figure is T1, then make BASE_GPS_REG=T1, a counter register CNT_REG is set simultaneously, begin counting, if then receive the imaging pulse constantly that certain sensor sends in count pulse n-hour, then its gps time is labeled as:

SENSOR_TIME=BASE_GPS_REG+CNT_REG * 0.1 microsecond

Because memory device 400 can be divided into a plurality of parts, the imaging of the corresponding sensor of each part is data constantly, this time is sent in the corresponding memory device 400, computing machine 600 regularly reads data (computer interface herein can be serial ports, parallel port, pci interface, USB (universal serial bus) etc.) in the memory device 100 by computer interface 500, and demarcate this pulse according to the order of sequence, as corresponding file, form is as follows:

The gps time count value

Like this, the imaging of each imaging sensor just can accurately be demarcated gps time by a GPS receiver 800 constantly, because the gps time stated accuracy of GPS receiver 800 can reach nanosecond, therefore, the calibrated error of apparatus of the present invention generally is subject to programming device 200 employed crystal oscillators, as the crystal oscillator of above-mentioned employing 10M, then error is 0.1 microsecond.

Claims

1, a kind of remote sensing multiple sensors imaging time alignment device is applicable to it is the imaging time aligning of two remote sensor imaging devices at least, comprising:

A plurality of sensors lay respectively in the remote sensing multiple sensors imaging device, are provided as picture pulse signal constantly;

A plurality of coaxial cable interfaces, this a plurality of sensor imagings of corresponding reception are pulse signals constantly, and form effective porch;

Gps antenna, it unobstructedly receives gps satellite signal;

The GPS receiver connects this gps antenna and the feed-in gps satellite signal, and the pulse per second (PPS) once of gps time data and per second is provided;

Programming device receives imaging pulse effective edge edge and gps time data and pulse per second (PPS), calibration sensor imaging aligning time data constantly;

Memory device is divided into a plurality of subregions, and is temporary corresponding to these a plurality of sensor imagings nominal time data constantly;

Computer interface is used to connect memory device and computing machine; And

Computing machine is regularly read the sensing imaging aligning time data constantly that is temporary in the memory device by computer interface, and is stored with the formatted file record.

2, remote sensing multiple sensors imaging time alignment device according to claim 1 is characterized in that, described coaxial cable interface forms the effective edge of sensor imaging pulse constantly along being meant predefined rising edge of a pulse or pulse negative edge.

3, remote sensing multiple sensors imaging time alignment device according to claim 1, it is characterized in that, described programming device is meant after it receives GPS standard signal and pulse per second (PPS) at every turn the demarcation of sensor imaging time, the GPS standard signal is stored in the register of its inside, note is made BASE_GPS_REG, and the pulse oscillator that starts its inner setting simultaneously is refined into time clock to pulse per second (PPS), and a counter register CNT_REG is set begins counting, the imaging pulse constantly that certain sensor that is received in count pulse n-hour is sent gives gps time and is labeled as: SENSOR_TIME=BASE_GPS_REG+CNT_REG * refinement clock cycle.

4, remote sensing multiple sensors imaging time standard apparatus according to claim 3 is characterized in that, described refinement clock cycle is 0.1 microsecond.