{"id":244,"date":"2019-03-09T18:37:23","date_gmt":"2019-03-09T10:37:23","guid":{"rendered":"http:\/\/aojp.lamost.org\/?p=244"},"modified":"2019-03-12T08:07:22","modified_gmt":"2019-03-12T00:07:22","slug":"simulate-high-cadence-multi-object-image-dyskysim","status":"publish","type":"post","link":"http:\/\/aojp.lamost.org\/?p=244","title":{"rendered":"Simulate High-cadence Multi-object image - dyskysim"},"content":{"rendered":"\n

The high-cadence multi-object imaging (HMI) is an effective way to discover and observe celestial objects with fast temporal variation, such as: space debris, exoplanet, optical counter part of the TDI or GRB. It would be interesting to develop new observation methods for the HMI, such as: multiple telescopes observation method or ultra-wide field high resolution image reconstruction method. The simulation would provide an unique way to test these ideas and we develop a software dyskysim <\/strong><\/em>to make it possible. The flow chart of dyskysim <\/em><\/strong>is shown below.<\/p>\n\n\n\n

\"\"
The Flow Chart of dyskysim<\/figcaption><\/figure><\/div>\n\n\n\n

The dyskysim<\/em><\/strong> has three parts: the starmap can generate a star catalog with temporal variation; the psfmap can generate a real photon map of the celestial objects and the imagemap can model the photon-electronic process and generate the observation image. The unique parts for dyskysim<\/em><\/strong> are: <\/p>\n\n\n\n

a high-fidelity multiple-layer atmospheric turbulence phase screen model (can import real turbulence profile from measure data and generate phase screens with any power spectrum); <\/p>\n\n\n\n

an all physical light propagation model from the poppy <\/em><\/strong>which makes simulation of the scitillation or light propagation inside the telescope possible; a <\/p>\n\n\n\n

an low-level photosensor model, which can model the CCD and CMOS with different types; <\/p>\n\n\n\n

a fast simulation mode, which can generate observation images with analytical PSFs (Gaussian or Moffat model); <\/p>\n\n\n\n

a high-fidelity star field simulation port, which can hold the star catalog either from dyskysim<\/em><\/strong> , other simulation code or real observation data. <\/p>\n\n\n\n


These features make dyskysim<\/em><\/strong> suitable to simulate the dynamical sky with very high cadence, which means we can generate wide field high cadence observation data with dyskysim. <\/p><\/blockquote>\n\n\n\n

The figures below are two simulated long exposure images generated from
dyskysim<\/em><\/strong> : one for sparse star field and one for crowd star field with moving targets (space debris).<\/p>\n\n\n\n

\"\"
Simulation results of sparse star field (left for analytical simulation result and right for Monte Carlo simulation result) from dyskysim<\/em><\/strong> with real and fast mode.<\/figcaption><\/figure><\/div>\n\n\n\n
\n\n\n\n
\"\"

Simulation results of crowd star field (left for analytical simulation result and right for Monte Carlo simulation result) from dyskysim<\/em><\/strong> with real and fast mode. <\/figcaption><\/figure><\/div>\n\n\n\n

You can also check the simulation results with the video of crowd star field and the sparse star field.<\/p>\n\n\n\n

\"\"
dyskysim <\/em><\/strong>simulation in the sparse star field.<\/figcaption><\/figure><\/div>\n\n\n\n
\"\"
dyskysim <\/em><\/strong>simulaiton in the crowd star field. <\/figcaption><\/figure><\/div>\n\n\n\n

The first version of dyskysim <\/em><\/strong>can be downloaded below. It follows the CC-ND licence. <\/p>\n","protected":false},"excerpt":{"rendered":"

The high-cadence multi-object imaging (H Read More ...<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-244","post","type-post","status-publish","format-standard","hentry","category-sciresearch"],"_links":{"self":[{"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/posts\/244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=244"}],"version-history":[{"count":10,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/posts\/244\/revisions"}],"predecessor-version":[{"id":271,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=\/wp\/v2\/posts\/244\/revisions\/271"}],"wp:attachment":[{"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=244"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/aojp.lamost.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}