$LastChangedDate: 27-Juil-2011 $

# CL_cw_diffDrag

Differential acceleration drag

## Calling Sequence

       [acc_diff]=CL_cw_diffDrag(altitude,cbal1,cbal2[,er,mu])

## Description

- Computes the differential acceleration of a chaser relative to a target due to atmospheric drag.

  The atmospheric density model used is an exponential model.

## Parameters

altitude:

  Target altitude [m] (1xN)

ballistic_coef_target:

  Target ballistic coefficient S*cx/m S=equivalent drag surface, cx = drag coefficient, m = mass [m^2/kg] (1xN)

ballistic_coef_chaser:

  Chaser ballistic coefficient S*cx/m S=equivalent drag surface, cx = drag coefficient, m = mass [m^2/kg] (1xN)

er:

  (optional) Equatorial radius [m] (default is %CL_eqRad)

mu:

  (optional) Gravitational constant [m^3/s^2] (default value is %CL_mu)

acc_diff:

  Differential acceleration (chaser relative to target) [m/s^2] (1xN)

## Authors

- CNES - DCT/SB

## See also

- CL_mod_expDensityDrag

## Bibliography

- 1) Mecanique spatiale, CNES - Cepadues 1995, Tome II, 16.3.2.4.7

## Examples

    [acc_diff]=CL_cw_diffDrag(350000,2.25,2.15)