A method for real-time adjustment of prf of spaceborne interferometric imaging altimeter
A real-time adjustment and interferometric imaging technology, applied in instruments, measurement devices, and re-radiation, etc., can solve problems such as failure to work properly, altimeter’s transmit and receive signals are prone to conflict with each other, and achieve rapid adjustment of PRF and rapid capture of target return. Wave, good robustness effect
Active Publication Date: 2019-12-17
NAT SPACE SCI CENT CAS
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Problems solved by technology
In this case, if the PRF is set to a fixed value, then as the orbital altitude of the satellite platform changes and the altitude of the sea and land on the earth's surface changes, the transmitted and received signals of the altimeter are very likely to conflict with each other and cannot work normally.
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[0059] The present invention will be further described below in conjunction with the accompanying drawings.
[0060] Such as figure 1 As shown, the present invention provides a real-time adjustment method for a spaceborne interferometric imaging altimeter PRF, specifically:
[0061] Step 1) Echo search and tracking are performed in the uniform PRF working mode;
[0062] Because the echo search process is suitable to be completed in the uniform PRF working mode, the uniform PRF working mode must be executed first, and then enter the pulse cluster working mode after the echo is searched.
[0063] Such as figure 2 As shown, the step 1) specifically includes:
[0064] s1. Enter the uniform PRF working mode.
[0065] s2. Read the satellite platform parameters to obtain the current orbital height, denoted as H.
[0066] If the platform parameter package does not include the current orbital altitude, the current orbital altitude can be calculated based on parameters such as the...
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The invention discloses a real-time PRF (Pulse Repeat Frequency) adjustment method for a spaceborne interferometric imaging altimeter. The method comprises steps: 1) in a uniform PRF working mode, thealtimeter searches a target echo by adjusting a search value and a search direction, and through echo gravity center tracking, the current target echo delay is obtained; 2) the altimeter is transferred to a pulse cluster working mode, teh value of the initial PRF is calculated by the current target echo delay, and through echo gravity center tracking, real-time PRF adjustment can be carried out.The method disclosed in the invention can realize quick capturing of the target echo and quick adjustment of the PRF, and has the advantages of being good in robustness and being applicable to wide range orbit changes of a satellite platform. The method of the invention has wide adaptability to altimeter observation targets and the method is applicable whether to observe a land or a sea, and seamless cohesion observation at a land-sea junction can be realized.
Description
technical field [0001] The invention relates to the design field of a spaceborne radar altimeter system, in particular to a method for real-time adjustment of a PRF of a spaceborne interferometric imaging altimeter, which can realize real-time adjustment of a pulse repetition frequency (Pulse Repeat Frequency, PRF). Background technique [0002] The spaceborne radar altimeter is a very important ocean microwave remote sensor, which can accurately measure the global average sea surface height with a measurement accuracy of centimeter level. The pulse repetition frequency is an important working parameter of the altimeter, and it is the primary consideration of the system parameter design. The traditional spaceborne radar altimeter has a narrow observation swath, and the PRF is usually a low fixed value, which does not need to be changed in real time on the satellite. The new-generation radar altimeter, represented by the interferometric imaging altimeter carried by Tiangong-...
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IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/41G01S13/9023G01S13/882
Inventor 翟文帅张云华石晓进
Owner NAT SPACE SCI CENT CAS