*stat-int* allows the creation of post-integrated statistics
files from .stat files *(see Statistics
and stat-make)*. Post-integrated
statistics files have the extension .stat*n* where *n* is the
number of scans integrated (by default *n* is 6, corresponding to
a 10 minute integration period).

In common with .stat files, each integration bin starts with a header block with the following structure:

STRUCTURE /stat_head/ INTEGER*2 stat_rev_no ! statistics revision number INTEGER*2 st_id(2) ! station id (west, east) INTEGER*2 year ! year INTEGER*4 rec_time ! time, secs of year INTEGER*2 tfreq ! frequency RECORD /rev_no/ rev ! fitacf revision number INTEGER*2 no_scans ! number of scans in stats data INTEGER*2 gipercent(2) ! f-o-v %, ground and ion scatter INTEGER*2 stat_res(3) ! reserved for future use INTEGER*2 ndata ! number of data blocks following END STRUCTURE STRUCTURE /rev_no/ !this defines the revision number structure BYTE major BYTE minor END STRUCTURE

*no_scans* contains the number of scans integrated in the
present integration bin (usually equal to *n*, but less if data
gaps exist).

*gipercent()* is the arithmetic mean f-o-v % ground and ionospheric
backscatter for the integrated scans.

The header block is followed by *ndata* data blocks (one for each
summary point in which backscatter was detected within the integration
period) of the following format:

STRUCTURE /stat_avdat/ INTEGER*2 point_id ! id of point INTEGER*2 glat ! geographic latitude of point INTEGER*2 glon ! geographic longitude of point INTEGER*2 txstat ! low power Tx status INTEGER*2 gpts ! number of ground scatter points averaged INTEGER*2 ipts ! number of ionospheric scatter points averaged INTEGER*4 gpwr_l ! ground scatter power, dB, lambda fit INTEGER*4 gpwr_s ! ground scatter power, dB, sigma fit INTEGER*4 gvel ! ground scatter velocity, m/s INTEGER*4 gwidth_l ! ground scatter spectral width, m/s, l-fit INTEGER*4 gwidth_s ! ground scatter spectral width, m/s, s-fit INTEGER*2 gelevpts ! number of ground scatter elevation angle points averaged INTEGER*2 gelev ! ground scatter elevation angle INTEGER*4 ipwr_l ! ionospheric scatter power, dB, lambda fit INTEGER*4 ipwr_s ! ionospheric scatter power, dB, sigma fit INTEGER*4 ivel ! ionospheric scatter velocity, m/s INTEGER*4 iwidth_l ! ionospheric scatter spectral width, m/s, l-fit INTEGER*4 iwidth_s ! ionospheric scatter spectral width, m/s, s-fit INTEGER*2 ielevpts ! number of ionospheric scatter elevation angle points averaged INTEGER*2 ielev ! ionospheric scatter elevation angle END STRUCTURE

*gpts* and *ipts* indicate the number of scans which
contributed to the ground and ionospheric backscatter values.

*gelevpts* and *ielevpts* indicate the number of scans
which contributed to the ground and ionospheric backscatter elevation
angles.

*gpwr_l, gvel,* etc. and *ipwr_l, ivel,* etc. indicate the
median powers, velocities etc. of ground and ionospheric backscatter
respectively.

The values of *gpwr_l* and *gvel* etc. are median values
determined from those scans during which backscatter was detected at the
summary point within the integration period.
If three or more scans contribute to these values then the power and
velocity (etc.) values do not necessarily correspond to the same scan and no
relationship can be assumed between them. For this sort of inter-parameter
analysis the non-integrated statistics should be employed. Integrated
statistics can only be used to give a general indication of the state of the
backscatter within the integration period.

Presently, integrated statistics files are not regulary created and should
be created *ad hoc* by the user when necessary.

To create .stat*n* files:

1) Change to the destination directory for the .stat*n* files

2) Execute:

/people/ets/Cutlass/statistics/stat-int *file* [*n*]

where *file* is of the form *pathname*/95022816f and the (optional)
*n* indicates the number of scans to integrate. *n* must be a
product of 72, otherwise an error is generated. The default value for
*n* is 6.