JPS63240223A - Satellite acdquisition system - Google Patents

Abstract

PURPOSE:To contrive the reduction of the required time for acquisition by deciding pseudo acquisition in parallel with a spatial region and a frequency region being two large factors of the pseudo acquisition and applying further correction acquisition control. CONSTITUTION:A spatial region pseudo acquisition decision and correction control section 40 and a frequency region pseudo acquisition and decision control section 50 are rovided so as to allow the pseudo acquisition decision correction control processing to be applied to the spatial region and the frequency region separately, both the sections are interfaced with an antenna system 20 and a reception equipment 30 respectively, thereby forming an interface system sending/receiving pseudo acquisition and decision correction signals 200, 300 and their operating state signals 210, 310. Start signals 400, 500 are outputted simultaneously from a satellite acquisition supervisory control section 60 managing mainly the start and end of the satellite acquisition to pseudo acquisition discrimination control sections 40, 50 of spatial and frequency regions respectively, the functions of each section are processed in parallel and the end of satellite acquisition is attained while the condition of the satellite acquisition is satisfied in receiving both end notice signals 410, 510 from each section.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to satellite acquisition, and in particular, the two major factors in acquisition, spatial domain acquisition processing and frequency domain acquisition processing, are performed in parallel to achieve pseudo acquisition. The present invention relates to a satellite acquisition method that determines whether or not the acquisition is false and corrects the acquisition to normal acquisition in the case of false acquisition.

(Prior art) Conventionally, in this type of satellite acquisition, processing in the spatial domain and frequency domain are performed in tandem, and the process usually starts with the acquisition process in the spatial domain, and shifts to the acquisition process in the frequency domain after completing the acquisition in the spatial domain. Satellite acquisition processing was mainly done manually using a sequential procedure.

FIG. 2 is a block diagram showing a conventional satellite acquisition method.

In the figure, 10 is an artificial satellite, 20 is antenna equipment, 3
0 is a receiving facility, and 45 is a pseudo acquisition determination correction control section.

(Problems to be Solved by the Invention) In the conventional satellite acquisition method described above, side low block of the antenna equipment occurs as a false acquisition in the spatial domain, and subcarrier lock of the receiving equipment occurs as a false acquisition in the frequency domain. , since the measures are incomplete,
Ultimately, both of these false captures are avoided through human comprehensive judgment.

Each type of pseudo-acquisition in the double-head area is unique, and in the case of the above-mentioned comprehensive judgment, it is common to both that the judgment criterion is mainly the reception level of the receiving equipment, but when correcting one pseudo-acquisition, Since the reception level is likely to fluctuate in the first area, which adversely affects the acquisition of the other area, acquisition in each area is performed sequentially.

Therefore, with the conventional method, it may take too much time to acquire the satellite, and necessary data may not be acquired. In particular, orbiting satellites have a short operating time, for example, medium-altitude satellites have a maximum operating time of about 15 minutes, so data from the satellite is likely to be lost, often hindering the operation of the satellite.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the satellite acquisition method provided by the present invention determines whether satellite acquisition in the spatial domain and frequency domain is a regular acquisition or a pseudo acquisition. Based on the result of the determination, a processing unit that corrects the pseudo-acquisition is provided independently for each region, and by activating these processing units simultaneously, spatial domain capture processing and frequency domain capture processing are performed. It is characterized by being performed in parallel.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. This embodiment includes an antenna facility 20 pointing towards a satellite 10, a receiving facility 30 .that receives data from the satellite. A pseudo acquisition determination correction control unit 401 that determines and corrects pseudo acquisition in the spatial domain; a pseudo acquisition determination correction control unit 50 that determines and corrects pseudo acquisition in the frequency domain; and 40.50 that performs independent processing. It consists of a satellite acquisition monitoring control section 60.

The operation of the satellite acquisition method shown in FIG. 1 will be explained.

False acquisitions in satellite acquisition can be broadly classified into those in the spatial domain and those in the frequency domain, the former being caused by side-low locking of the antenna equipment and the latter being caused by subcarrier locking of the receiving equipment. That is, the former cause corresponds to the operation of the antenna equipment, and the latter cause corresponds to the operation of the receiving equipment. however,
There is no correlation between these two pseudo-acquisitions. Therefore, the embodiment of the present invention utilizes the mutual independence of both pseudo-acquisitions. That is, the spatial domain pseudo capture determination correction control unit 40 and the frequency domain pseudo capture determination correction control unit 5 are configured so that the pseudo capture determination correction control process can be performed separately for spatial domain and frequency domain.
0, and these are both connected to the antenna equipment 20 and the receiving equipment 3.
0, and the pseudo acquisition determination correction control signal 200, 300 and its operating status signal 21.
It is an interface system that sends and receives 0.310.

Further, each part of the pseudo acquisition determination correction control unit 40, 50 is an interface for inputting the lock-on status signal of the receiving equipment, since it is essential for active processing.

Specific examples of the spatial domain pseudo acquisition determination correction control section 40 and the frequency domain pseudo acquisition determination correction control section 50 will be described below.

The pseudo-acquisition determination correction control unit 40 in the spatial domain uses the forecast value, adds certain spiral search data to the antenna pointing angle data of the forecast value, and combines it with reception level data obtained by directing the antenna in advance. Pseudo-acquisition is determined by comparing the stored antenna pattern level data of the acquisition antenna (corresponding to the search data), and the directivity angle of the antenna is corrected so that the pattern levels are relatively symmetrical.

Further, the pseudo acquisition determination correction control unit 50 in the frequency domain
sets the center frequency of the receiving equipment to match the radio waves from the satellite. At the same time, when a target satellite is specified from outside, the information on the target satellite is searched from the spectrum information of the satellite group stored in advance, the frequency difference between the main carrier and the primary subcarrier is calculated, and the frequency fluctuation is calculated. (Frequency fluctuation factors include the temperature of the satellite, the crystal of the receiving equipment, the Doppler component, etc.), plus α, and set the period during which the voltage controlled oscillator (VCO) in the receiving equipment's phase-locked loop (PLL) is being swept. do. After handover, pseudo-acquisition is performed by calculating the difference between the received frequency and the frequency at PLL lock, and comparing and matching the static frequency with the spectrum information. When pseudo-acquisition is determined, PLL lock-on reject control is performed, and re-locking is performed. Acquisition can be corrected by scanning and performing the same determination procedure after locking on the receiving equipment.

When satellite acquisition is performed using the system configuration shown in FIG. 1 described above, from the satellite acquisition monitoring control unit 60 that mainly manages the start and completion of satellite acquisition, to the pseudo acquisition determination correction control unit 40, 50 in the spatial domain and frequency domain. At the same time, start signals 400 and 500 are outputted to cause the 81 functions of each section to be processed in parallel, and when both completion notification signals 410 and 510 are received from each section, the satellite acquisition conditions are met and the satellite acquisition is completed.

As detailed above, instead of the conventional satellite acquisition method, which is a tandem method, this embodiment uses a parallel method to acquire satellites.
The time required for satellite acquisition can be shortened.

(Effects of the Invention) As explained above, the present invention is a method in which false acquisition is determined in parallel in the spatial domain and frequency domain, which are the two major causes of false acquisition, and further corrective acquisition control is performed, thereby reducing the acquisition time. This is particularly effective for orbiting satellite operations where the operating time is relatively short.

Furthermore, if this method is adopted, completely automatic capture becomes possible, and when used in conjunction with a computer system, an unmanned system can be constructed, which has the effect of saving labor and speeding up the acquisition. Furthermore, in the present invention, if the acquisition process is performed by software, a functionally modular system can be easily constructed, and a highly reliable satellite acquisition method with high maintainability can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 1... Downlink from satellite, 10... Satellite, 2
0... Antenna equipment, 30... Receiving equipment, 40...
Spatial domain pseudo acquisition determination correction control unit, 45... Pseudo acquisition determination correction control unit, 50... Frequency domain pseudo acquisition determination correction control unit, 60... Satellite monitoring control unit, 100...
- Received data from the satellite, 200... Spatial domain pseudo acquisition determination correction control signal, 210... Operation status signal of spatial domain pseudo acquisition determination correction control, 300... Frequency domain pseudo acquisition determination correction control Signal, 310... Frequency domain pseudo acquisition determination correction side control operation status signal, 400...
・Activation signal for pseudo capture determination correction control in spatial domain, 410
. . . Completion notification signal of spatial domain pseudo acquisition determination correction control, 500 . . . Start signal of frequency domain pseudo acquisition determination correction control, 510 . . . Completion notification signal of frequency domain pseudo acquisition determination correction control.

Claims (1)

[Claims] A processing unit is provided independently for each region to determine whether the satellite acquisition in the spatial domain and the frequency domain is a regular acquisition or a pseudo acquisition, and to correct the pseudo acquisition based on the result of the determination, A satellite acquisition method characterized by performing spatial domain acquisition processing and frequency domain acquisition processing in parallel by activating these processing units at the same time.